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Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] Respiratory monitoring is essential for determining the vital characteristics of the human body and diagnosis of sleep-disordered breathing, critical diseases, and neonates. Moreover, micro/nanosensors play an important role in healthcare. In particular, they can detect changes in humidity around the nose and mouth for analysis of respiratory behavior. Herein, a high-performance flexible wearable humidity sensor was developed using a chitosan/conductive carbon black (CS/CB) hybrid film as the sensitive layer for respiratory detection. [Methods] The humidity sensor was fabricated by screen-printing a CS/CB film on a flexible poly (ethylene terephthalate) substrate with interdigitated electrodes. Scanning electron microscopy (SEM) was conducted to demonstrate the successful synthesis and combination of the CS/CB hybrid film. The SEM results showed that the CB particles are uniformly embedded in the CS/CB film with porous and rough nanostructures, which can help water molecules diffuse into the sensitive film. The humidity performance of the humidity sensor was tested by switching the device between different RH levels established by several saturated salt solutions (11%-97% RH) at room temperature. The resistance of the CS/CB sensor was measured with a high-precision data logger. The CS/CB humidity sensor had good electrical conductivity, and its resistance was increased with the increase in RH with good linearity. The sensor was experimentally evaluated for its performance parameters, such as sensitivity, response recovery characteristics, and repeatability. The humidity switching test demonstrated that the sensor has a fast response rate and good discrimination to different humidity environments. The sensor under the humidity rise reduction test showed good symmetry and coincidence, indicating that the hysteresis effect can be ignored. The CS/CB humidity sensor demonstrated good repeatability, rapid response/recovery time, and negligible hysteresis. A flexible wearable film-type breath detection platform was developed using a single-chip microcomputer and LabvIEW technologies, which achieved real-time data reading and processing of humidity, communication between the microcontroller and computer terminal, and display of breath waveforms. The detection platform has low production costs and is easy to operate, providing new insights into the practical application of high-performance humidity sensor detection technology. The sensor is placed in the mask for respiratory behavior monitoring, including normal breathing, slow breathing, rapid breathing, stop breathing, Biot's breathing, wave breathing, tidal breathing, febrile patient breathing, etc. The breathing frequency and intensity can be observed clearly. [Results] The flexible wearable humidity sensor could monitor and analyze human respiratory conditions with high accuracy and reliability. It demonstrated good application in realtime human breath monitoring. The humidity-sensitive mechanism of the sensor was ascribed to the good hydrophilicity and many active sites (hydrophilic groups and vacancies) on the CS/CB nanomaterials to absorb water molecules. In addition, the CS/CB nanomaterial with high surface area had numerous surface-active sites to adsorb water molecules. [Conclusions] The developed CS/CB humidity sensor has great practical potential in wearable applications, especially in humidity sensing detection. It also promotes students' in-depth understanding of the experiments and applications of flexible wearable sensors, effectively enhancing their motivation and effectiveness of teaching. [ABSTRACT FROM AUTHOR]

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The data accuracy and anti-interference of inertial measurement unit (IMU) three-axis Euler angle are affected by high frequency noise and strong instantaneous interference. To solve this problem, this paper proposes a dynamic error suppression method with low computational burden, good real-time performance and low cost, which is more suitable for embedded systems. In this method, an infinite impulse response-extended Kalman filter (IR-EKF) is introduced to the front end of the EKF algorithm. The data are preprocessed with a second-order low-pass Butterworth filter (BF) to help EKF suppress high frequency or strong interference. The IIR-EKF algorithm is implemented in the STM32H743 microcontroller. The experimental results show that the data variance is very big when the EKF acts alone, and great discrepancy occurs when strong interferences are encountered. When unscented Kalman filter (UKF)acts alone, the data variance is smaller than that of EKF. Although it does not depend on the initial noise parameters, it does not meet the requirements. After the addition of the second-order BF, the data variance is significantly reduced, the instantaneous error is greatly suppressed, and the stability and anti-interference ability of the system are enhanced. [ABSTRACT FROM AUTHOR]

Copyright of Wool Textile Journal is the property of National Wool Textile Science & Technology Information Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The equipotential switching algorithm of the traditional mechanical static compensator (MSC) device had many limitations in the operation of the single machine, such as the long operation time of the microcontroller control chip, the poor convergence of the calculation results had been affected by the hardware, and so on. In recent years, the research on devices that can communicate with the back end through the message queuing telemetry transport, MQTT protocol through the internet of things(IoT)platform has becoming more and more mature, and the development of IoT technology has also made it possible to apply machine learning algorithms such as neural networks to stand-alone electrical equipment. In the experiment, through a large number of data sets training, the switching time in different electrical environments could be predicted to achieve the adaptive equipotential switching effect, the adaptive switching without spark, no inrush, no overvoltage etc, was achieved in the developed device. The research and development focus includes the equipotential switching principle and simulation of the device, the IoT communication method between the device and the back-end software, the implementation process and training results of the BP neural network algorithm, and the experimental results and experimental analysis of the switching experiment. [ABSTRACT FROM AUTHOR]

Development of efficient and reliable detection methods for sensitive detection of tetracycline residues is of great significance to ensure the foods quality and human health. Due to the lack of accuracy and convenience of the existing methods in detection of tetracycline residue, a portable photoelectrochemical (PEC) device for detection of tetracycline was designed and developed in this work, and the feasibility of the developed device to detect tetracycline residues in fish was further explored. For the development of the portable device, light emitting diode (LED) and STC89C52 microcontroller were employed as excitation light source and control core, respectively. In order to avoid the interference of external light on the detection results of the LED activated PEC sensor, a darkroom of light source was designed for the detection device, which was obtained by using 3D printing method. Then the output signal of the light source and the accuracy for the current signal collection of the developed device was studied. The results showed that the output signal of LED excitation light source was stable, and by comparison, the signal collected by the developed portable device was basically consistent with the commercial CHI660E electrochemical workstation used in the laboratory, which proved that the developed detection device has good accuracy for the collection of current signal and can be further used. For the construction of the PEC sensor, an integrated screen printing electrode was used to replace the traditional three-electrode system to further simplify the detection device, Bi2S3/g-C3N4 was used as photoactive material for the construction of the sensing interface and aptamer was used as the specific recognition element for selective recognition of target tetracycline. By the combination of the developed portable device and the proposed PEC sensor, a simple method for sensitive and on-site detection of tetracycline was finally fabricated. The current of the PEC sensor increased gradually with the increase of the tetracycline concentration, and the logarithm of the current signal of the sensor and the tetracycline concentration showed a good linear relationship within the range of 1×10-11 ~ 1×10-8 mol/L. The detection limit was 3×10-12 mol/L. Compared with the methods reported in the literatures, the proposed method had a lower detection limit, and the detection cost of the portable device-based detection method was relatively much lower. By virtue of the high specificity of aptamer, the constructed sensor could be used for selective detection of tetracycline in the present of four other kinds of antibiotics (oxytetracycline, ofloxacin, aureomycin and roxithromycin). Fish was selected as a model and a standard addition method was used for real sample analysis, the recovery rate of tetracycline residue in actual fish samples was 92% ~ 94%, the relative error was no higher than 8.0%, and the relative standard deviation was 1.7% ~ 3.5%. In order to verify the accuracy of the portable method, the results were also compared with the ultrahigh performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), and the results of the two methods were basically consistent, which showed that the detection method based on portable PEC detection device has good accuracy and reliability for the detection of tetracycline residues in fish. In addition, by the computer software programming and the analysis of the liner relationship between the current signal and the tetracycline concentration, the developed portable device could obtain the target tetracycline concentration results directly by using the organic light emitting diode (OLED) displayer. This work provides a new way for accurate and on-site analysis of tetracycline in aquatic products and other samples. [ABSTRACT FROM AUTHOR]

To solve the problems that the existing online pesticide mixing system cannot accurately control the ratio of pesticide and water, and the amount of mixture is still excessive in agricultural operations, an online pesticide mixing system was designed based on the synchronous control of water and pesticide flow. The system was mainly composed of a decision module of mixing dosage and a control system. The input of the mixing dosage decision model was the output of the spray dosage decision model in the variable spray system, which was combined with the flow regulation control cycle in the mixing dosage decision model to calculate the water and pesticide dosage in the system in real time. After processing, the pulse width modulation (PWM) duty cycle data was transmitted to microcontroller unit (MCU) by the mixing dosage control system, and the PWM instruction was generated and sent by MCU to the dual-channel PWM driver circuit. The desired PWM duty cycle value was generated to adjust the working voltage of the conveyor pump for synchronously adjusting the flow of water and pesticide. The test results show that when the flow accuracy of peristaltic pump and diaphragm pump are in the controllable range of 0-135.5 mL and 0-18.65 L, respectively, the measured mixing error is less than 5% after specifying the mixing amount of 5.00 L. When the mixing ratios are 100, 300 and 500 with the flow regulation control periods of 300, 500 and 600 ms, the mixing ratio error can be kept within 3.24%. It can be seen that the mixed drug effect is good. [ABSTRACT FROM AUTHOR]

Copyright of Electric Machines & Control / Dianji Yu Kongzhi Xuebao is the property of Electric Machines & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of World Nuclear Geoscience is the property of World Nuclear Geoscience Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Forest Products Industry is the property of China Forest Products Industry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

t: Stalk set-row planting has been one of the conservation tillage systems to minimize the frequency or intensity of tillage operations in northeast China. The agricultural management approach can integrate the tillage and planting operations to cover at least 30% of the soil surface with crop residues. A narrow row zone can be sown to clear out from the stalk-covered surface in the wide leisure zone. However, the pesticide liquid cannot reach the stalk strip surface, particularly when weeding the crop during the seedling stage under stalk mulching in the traditional full-coverage spraying mode. In this study, a precision spraying device was designed to promote the utilization rate of pesticide liquid using image recognition. Firstly, a digital camera was mounted in front of the plant protection machine to real-time capture the stalk set-row planting images in fields. A Digital Signal Processor (DSP) was used as the host computer to pre process the images. Then, an optimized multi-threshold segmentation was performed on the images of stalk and seedling strip parts. A series of morphological operations were utilized to correct the dividing edges, where an external moment was selected to frame and separate the seedling strip areas of the field. As such, the position of the seedling strip center was evaluated to mark out the line of the seedling strip. Secondly, an STM32 microcontroller was used as the lower computer. Specifically, the controller drove the stepper motor slide to move the nozzle on the top of the seedling strip for spraying, according to the line coordinates of seedling strip positioning. At the same time, a multi-subdivision drive was used to improve the operation precision of the stepping motor. Nevertheless, some unfavorable conditions occurred in the horizontal and vertical kinds of airflow during spraying, whether the droplets drifted into the stalk rows, or the uneven spraying was caused by the air. Therefore, the drift rate of the droplet was calculated under different velocities of airflow using Fluent fluid simulation software. After that, the fuzzy controller was set up, with the horizontal and vertical airflow speed as the input, and the spray volume as the output. The spray volume was changed to adjust the opening degree of the electric valve for a better uniform settlement of the chemical liquid. Finally, the precision spraying device on a platform was tested to verify the simulation in the field. The test results showed that the accuracy of the self-developed device was about 88.3% for the positioning line of the seedling strip. A WFS-II integrated test bench was used to evaluate the spray performance. The spraying of a single nozzle was measured on the rows to save the liquid by about 64.8% more than before. The qualified rate of spraying on the rows was about 85.8% than before. The variable spraying test was conducted to maintain the liquid coverage at 28.5%-33.8% in the variable spraying mode. The field trials demonstrated that the precision spraying saved about the pesticide liquid of 52.84% in the stalk set-row planting mode, compared with the traditional full-coverage one. Furthermore, the uniformity level of liquid deposition was also improved significantly. Consequently, this device can be expected for the plant protection machinery in the precision application of seedling strips during the stalk set-row planting. The finding can provide a strong reference for the precision spraying to improve the liquid utilization rate and environment, particularly for the technical support to promote the conservation tillage. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to realize the real-time monitoring of multi-tow tension in polyester staple fiber production process and improve product quality, a multi-tow tension real-time monitoring system was designed. STM32 microcontroller hardware system was taken as the lower machine in the detection system, real-time tension was obtained through strain gauge pressure sensor and tension transmitter, and the information was transmitted to the upper machine through Modbus communication protocol. According to the existing equipment in the factory, gantry frame type tension synchronous detection device and ceramic indenter detection device were developed, which can accurately detect the tension of 24 strands of polyester staple fiber on the production line. SQL Server relational database management system in industrial computer was used to realize digital information management of tension monitoring. The system can monitor the tension of polyester staple fiber in real time, provide data reference for subsequent tension adjustment, and improve product quality. [ABSTRACT FROM AUTHOR]

Copyright of Railway Signalling & Communication Engineering is the property of Railway Signalling & Communication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Environmental factors including temperature, humidity, and gas atmosphere directly determine the daily performance, growth rate, and immune status of livestock and poultry in a farm. It is highly urgent to detect the factors for real-time monitoring the health state of livestock and poultry, particularly the relationship between environmental factors and health state. Therefore, a healthy aquaculture pattern can be developed to optimize the breeding environment. In this study, a mobile intelligent monitoring platform was established to detect the key environmental factors within the whole area. An integrated sensor system was installed in the fixed important points. A four-wheel trolley with sprocket wheels was used to drive the platform. The motor and transmission components were installed inside the car body in the need of waterproof and anti-corrosion. The upper side of the car was sealed with a cover plate, and only the integrated sensor system installed on a foldable telescopic mechanism that needs to be exposed was fixed on the plate. Height adjusting of an integrated sensor system was performed via changing the folding angle and telescopic length of a foldable telescopic mechanism. The sensors were assembled separately and disassembled conveniently, in order to facilitate repair and maintenance, and even the integrated sensor system was replaced as a whole. AnSTM32 microcontroller was used as the master control unit in the system. A PCB-integrated sensor system was selected to detect the temperature, humidity, CO2, H2S, NH3, and dust concentration in the environment. Three standard conditions were set for the detection. Specifically, when the livestock or poultry felt uncomfortable, their behavior appeared too quiet or too irritable. When the livestock or poultry was sick, their body temperature was abnormal. When an infection occurred, the surface of the skin was ulcerated. A camera with a high-speed image transmission and a remote infrared temperature measurement device was used to monitor the livestock and poultry, where the abnormal state of their body temperature was observed in time, and the infection was found at an early stage. Two monitor sensors were installed on an electromechanical actuator, which was fixed on an electromechanical indexing plate in the front of the mobile platform. The actuator was used to adjust the pitch angle, whereas, the indexing plate was used to change the horizontal angle. An Ultra-Wide Band(UWB) wireless system was also selected to accurately locate the position of the mobile platform. All the data was sent to the STM32 microcontroller in UART, IIC, or analog output mode. The STM32 microcontroller processed the data with the Savitzky-Golay filtering, and then uploaded the data to the Ali Cloud IoT platform through a WIFI module. The users can login to the web page to remotely access the data, and thereby monitor the status of livestock and poultry in real time. The experimental results show that the detection data of a mobile intelligent detection platform was similar to that of the sensors in the former pig farm, where the relative difference between them was less than 10%. The positioning error was close to the 10 cm level, when the base stations were located at the optimal position. The monitoring data were reliable, and the mobile intelligent monitoring platform ran stably for a long time. The mobile platform can also serve as a carrier to transport about 200 kg of heavy objects. For instance, materials and livestock can be transported by the platform, when installing an upper cover plate with a winch and inclined plane on the surface. The proposed mobile intelligent monitoring platform can provide a hardware foundation for whole-scale environmental monitoring of livestock and poultry farms. [ABSTRACT FROM AUTHOR]

The framework of marine monitoring network based on real-time operating system is designed to monitor marine information in real-time and protect the marine environment. The design uses STM32 microcontroller application Free Real-Time Operating System(FreeRTOS)，through a variety of sensors to collect data in the sea. And the FreeRTOS applies the MQTT to transmit data,to achieve real-time monitoring of the marine environment. Through the task design on FreeRTOS, the data collected by current meter and bathymeter are transmitted. Finally, the marine environment is monitored in real time.

Copyright of Wool Textile Journal is the property of National Wool Textile Science & Technology Information Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To satisfy the application requirements of high-speed optical wireless transmission in collegial high-speed data transmission teaching experiment, a high-speed optical wireless transmission instrument is developed, and its performance is evaluated in this paper. The instrument consists of a dielectric conversion module with an IP175GHR chip and an optical module of CS6721, which is a three-in-one intelligent chip, as the main control chip. It has the advantages of small size, low cost and high reliability. Based on the above hardware, an extinction ratio algorithm suitable for the whole temperature range is also proposed. It can maintain the stability of light power in the environment of rather long distance transmission and large temperature transition. Finally, three client software programs are designed according to the characteristics of microcontroller unit (MCU). The test results show that the high-speed optical wireless transmission instrument has stable and fast data transmission ability, and it can quickly establish transmission link in most scenarios. In addition, it can be well used in experimental teaching related to optical wireless transmission scenarios. [ABSTRACT FROM AUTHOR]

Comprehensive design experiment is an effective means to improve the teaching quality of experiment course of single chip computer. The experimental teaching case designed by combining the content of the experimental course with the hot social issues integrates all the knowledge points of the single chip experiment, increases the students' enthusiasm for learning the experimental course, and stimulates the students' interest in the practical teaching link. Through the design of a real project with practical engineering application background and practical significance, students can grasp the design process of an electronic: product, so that students can realize the function of low power control system of micro solar power station based on single chip computer with their own designed hardware system and software development. The case is open, hierarchical and heuristic, which greatly improves the students' practical ability and innovative practical ability, and achieves good results in the process of practical teaching. [ABSTRACT FROM AUTHOR]

This paper analyzes the basic structure and difficulties in design of microcontroller’s clock system. A method is proposed to complete initialization process of clock system based on MDK software’s initialization code and graphical configuration interface. With the virtual simulation function based on MDK software, user can use the configuration values of the internal registers and clock generation schematic to verify the correctness of the design of the clock system. This design method and virtual simulation function can reduce the development difficulty and improve the development efficiency. [ABSTRACT FROM AUTHOR]

The Arduino open-source platform is widely used in experimental teaching and electronic design. With the complexity and intelligence in these areas, the traditional Arduino hardware cannot meet the requirements in the future. In order to expand the Arduino hardware ecosystem, the LPC5411x microcontroller is used as an example to illustrate the process of porting other hardware into Arduino. First of all, the overall architecture of Arduino was layered, and the role and connection of each layer were elaborated. Second, the porting process is described through creating a new file system, Arduino library development and configuration documentation analysis. Finally, the correctness of the transplant method was verified by concrete routines, and the normal embedded development of LPC5411x on the Arduino IDE was successfully implemented. It may provide an important reference for extending the Arduino hardware ecosystem and the application of open-source platforms. [ABSTRACT FROM AUTHOR]

At present, the tillage and seeding in the production of greenhouse fruits and vegetables have been mechanized. however, current mechanical devices are not suitable for mid-term management and transportation of viaduct cranberry fruits and vegetables. It means low efficiency and the need for more farmers, which restricts the development speed of the hole course mechanization of fruit and vegetable to produce seriously. Aiming at the problems of high labor intensity and low working efficiency in fruit and vegetable management, picking and transportation, pollution problems and so on, an electric lifting platform for greenhouse was designed based on studying and analyzing the collected data, which had the functions of walking, turning, lifting and hanging transportation. The electric lifting platform for greenhouse was mainly composed of the workbench, lifting device, chassis, battery pack and control system with dual operation mode and so on. The working principle was described, and the structure and parameters of key components were studied by theoretical calculation and simulation analysis. In particular, the control system with dual operation mode was designed to remote and online operation of the job platform, which was programmed by C language based on STC 15W4KS4 series single chip computer. In the end, the research about turning performance, slope driving and climbing performance and endurance time of the platform by the bench and field tests were carried out in the lab respectively. The test results showed that the minimum turning radius was 0.94 m, the maximum speed was 2 km/h, and the endurance time could reach to 4 h under 200 kg load. Driving on a slope, the forces analysis of platform from the slope in 3 conditions were carried out, it showed that the climbing angle was unchanged, the stability of the platform under different conditions was related to the platform weight, the loaded weight, the contact length, the lifting height, the center distance between the left and right caterpillar, and the width of caterpillar, etc. The maximum tipping angle was 30.5°, 25.6°, and 20.6° when the platform was lengthwise, crosswise and oblique to the slope respectively. The maximum tipping angle was closely related to the center of gravity of the platform. And it was gradually decreases when the height increase of workbench and loads increase. It was also closely related to the position of state platform and slope. The safety factor was the highest when the platform was lengthwise to the slope, which was better than that crosswise and oblique to the slope. When the power was above 60%, the maximum speed would always be maintained; when the remaining power was below 60%, the maximum speed would gradually decrease with the decrease of the power; when the remaining power was 40%, the endurance time was already 3.5 h; when the power was less than 40%, the power of the battery would decline rapidly; when the remaining power was 10%, the driving speed was only 0.5 km/h and the total endurance time was 3.9 h. So we could deduce that when the power was exhausted, the total duration was enough to reach 4 h. In order to evaluate the driving stability of the field slope, the cornering performance, the ground transportation performance and the lifting performance of the work table, the field experiments were carried out in Changshu, Shandong province. The results showed that all the parameters met the design expectation and the agronomic requirements of greenhouse structure. It provides a reference for fruit and vegetable management, picking and transportation in greenhouse. [ABSTRACT FROM AUTHOR]

Considering the needs of laboratory safety construction, a useful and economic laboratory safety monitoring system based on the Zigbee wireless technology is designed. The system uses the characteristics of pressure film sensor to detect whether the door is locked and the main electric switch is closed, instead of replacing the laboratory door lock and rebuilding the internal circuit switch. By using the STM 32 microcontroller technology and the ZigBee protocol to realize data processing and wireless communication, the system can monitor the switch state of a plurality of switches and the laboratory door in real time. It not only avoids the consumption of manpower of laboratory managers patrolling the laboratories one by one, but also reduces the potential safety hazard of laboratories. [ABSTRACT FROM AUTHOR]

An intelligent desk lamp prototype system for sitting posture detection based on STM32 is proposed. The system is controlled by voice, and composed of a main controller module, a voice recognition module, a human body infrared sensing module and a relay module. With the STM32 microcontroller as the main controller, the voice instructions are obtained and parsed by WTK6900 B-B01 voice recognition module to realize the control functions of LED lamp, which include switch, brightness change and color change. The HC-SR501 infrared sensor module is used to detect user’s sitting position. If the sitting posture is incorrect, the alarm lamp will be lit and the horn will be honed.By adopting SRD-05 VDC-SL-C relay module, the coupling isolation among different components of system is realized, and system’s load capacity, control function and safety protection function are improved. The test results show that the prototype system not only realizes the convenience and humanization of the lamp’s control mode, but also has functions of preventing hump back and myopia, and the cost is reasonable, so it has ideal practicability and market potential. [ABSTRACT FROM AUTHOR]

The course design of microprocessor and interface technology has practical characteristics, the authors design and develop several interface expanded boards based on MSP430 F5529 LP microcontroller core experiment board. CCSv6 software is implemented to construct MSP430 F5529 LP microcontroller course design platform with low-power application.Three students form a group and are assigned one practice project. Course design that includes project designing, hardware and software development, debugging and verification, is performed and completed based on this MSP430 F5529 microcontroller experiment platform. Three typical course design projects are introduced in this paper, i. e., Chinese character/image circulating display on the LCD, design of low frequency measurement instrument and design of remote control smart car. It is indicated that students can put their own ideas into practice project design and development via this experiment platform. In addition, hardware and software integrative development capability and group cooperation spirit can also be cultivated through this experiment platform. [ABSTRACT FROM AUTHOR]

Copyright of Ordnance Industry Automation is the property of Editorial Board for Ordnance Industry Automation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The visible light communication (VLC) technology has the characteristics of high transmission speed and environmental protection from electromagnetic interference, so it can be used to solve the shortcomings of traditional password access control, card access control, biometric access control in comparison efficiency and security performance. The visible light communication technology and access control technology are jointed to design a visible light communication access control system. The microcontrollers are used to store and process the password information, and the LED is used to transmit password information with pulse width modulation (PWM) and the photodiode is used to receive the optical signal to realize the transmission of the password information. The hardware design of this access control system is established and analyzed. The results showed that the system can work normally without any misjudgment and the comparison efficiency is higher. [ABSTRACT FROM AUTHOR]

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the widespread use of various types of air conditionings in the university laboratories, the problem of intelligent control of the air conditionings arises. The existing air conditioning control methods are mainly based on decentralized manual control, it brings a series of management problems, and also causes unnecessary waste of energy. In order to solve the problem , the development of an intelligent air conditioning control system is designed. The design consists of terminal design and host computer design, and realizes the information exchange of the host with the terminal, at last the centralized control is reached. The practical application results show that the design realizes centralized management, intelligent management, and has significance in energy saving and emission reduction. [ABSTRACT FROM AUTHOR]

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The smart metering concentrator is the key section in the information collection system, and data acquisition and transmission become a bridge between meters and data center in the national smart grid information collection system. A smart metering concentrator is designed in this paper based on finite state machine model. In the design of the concentrator hardware, ARM Cortex-M3 microcontroller core is used as the core controller, GPRS is used for remote communication medium, 37kHz modulated infrared and RS485 for local communication interface. In the software design, a finite state machine model is used. Every task is redefine in the form of a finite state machine to further improve the real-time nature of each task. In the design of tasks, three-tier structure of the system architecture is designed which is composed of applications layer, abstraction layer and the driver layer. The three-tier structure is conducive to system hardware platform migration. The system has good real-time, high stability, and easy to transplant. [ABSTRACT FROM AUTHOR]

Adaptive filter can automatically select cut-off frequency according to the center frequency of signal so it plays a significant role in non-power electrical measurement system. Based on the characteristic of traditional filters, using microcontroller and FPGA as the operation core, a novel adaptive low-pass filter is proposed and designed. The filter has the functions of programmable amplification and programmable filter. The programmable amplification module consists of instrumentation amplifier AD620 and variable gain amplifier VCA810. Its biggest gain can reach 60dB and the gain is linearly adjustable. The programmable filter module consists of low-pass filter MAX297 and FPGA. FPGA is used to measure the signal center frequency and produce the control signal of the filter cut-off frequency, and MAX297 is used to realize low-pass filter. Experiments show that the gain error is less than 2%, the frequency error of cut-off frequency control signal is less than 1% and the cut-off frequency error of filter is less than 1.5%, when the input signal of frequency in a range from 0. 1 Hz to 50 kHz. [ABSTRACT FROM AUTHOR]

The traditional teaching model of these three courses which are digital circuit, principle of microcomputer and principle of microcontroller has some problems, such as the explanations of the circuit principles and functions in the theory courses are monotonous and the experimental class contents are inalterable, etc. The approach for improving the teaching quality of these courses is researched to solve the problems. So a synthetic software simulation system including these three courses' contents is designed by software Proteus. The system can have no microcontroller and also can use 8086 minimum model system or AT89C52 microcontroller as the core. And it is surrounded by the common digital circuits, programmable interface circuits, the commonly used serial buses and inputoutput circuits. Then this system is used to accomplish the example of synchronization of each digital clock display through serial communication between 8086 and AT89C52 with related programming software. The example is analyzed by circuit principles, program flows and simulation results. So it indicates that this system can assist teachers to complete these three courses better, and it is helpful to improve the circuit system development capabilities of the students. [ABSTRACT FROM AUTHOR]

Aiming at the low power factor and the pollution of power grid of conventional AC/DC converter, a Boost circuit, of which AC/DC converter was based on MSP430 was designed. The design, adopting monitors voltage and current signal, through the implementation of double closed loop operation MSP430, using the active power factor correction (APFC) technology to produce PWM wave, controlled on-off conversion circuit MOSFET, and at the same time realized the active power factor correction. The test data showed that this conversion circuit could output the stability voltage of 36 V. Load adjustment rate could reach 0. 334%,the lowest power factor adjustment could reach above 0. 96. It could meet the requirements of the performance index and had higher control precision. [ABSTRACT FROM AUTHOR]

In China, commercial electricity was not available in most mountain orchards. Therefore, low-power systems are required. On the other hand, strong demands for developing automatic irrigation systems also existed in those areas. It's also important to implement the central management strategy for those irrigation systems. Wireless networks could be helpful in transmitting soil moisture information and monitoring irrigation status. Taking advantage of wireless networks in the irrigation system for further implementation of a central control strategy is becoming a hot topic in irrigation engineering. This paper is aimed at providing a low-cost and low-power wireless irrigation solution for small-scale orchard growers to realize automatic time-control irrigation. The system was composed of several nodes, each node of hardware consisted of a MSP430F2132 micro controller, a short range RF transceiver (CC1100, Texas Instrument), an RS-232 interface for long distance communication module, an LCD (liquid crystal display, JLX12865-0086PC) module, a 9 V Battery module, a valve driving circuit and a soil moisture sensor (Decagon EC-5 or other) interface. Time synchronization communication protocol was designed for system nodes; therefore, the whole system could enter the sleep mode when there was no irrigation task. Furthermore, the WOR (wake on radio) feature of the RF module also helped to reduce power consumption of the nodes when the nodes were woken up for synchronization. The system power consumption test was performed under 9 V battery voltage; the quiescent current consumption is 400 μA. While the WOR current consumption was 19 mA, the current consumption of the system was 439 μA on average. Calculations also indicated that the charge of daily operating a pulse solenoid valve covers only a tiny portion in a whole node's daily charge. The battery discharge experiment in the conditioning of 100 mA const current revealed that the selected battery module could provide a charge of 400 mAh. In the test, output voltage dropped from 9 V to 5 V. According to the estimation, the system could run for at least 38 days without changing batteries. Communication tests in mountain orchards showed that the minimum packet loss rate when nodes were randomly distributed was 6.19%, the effective communication distance with 3 dBi antenna on each node reached 70m. The RSSI (received signal strength index) did not show a significant difference in the experimental orchard compared with open field RSSI experiment results, but the packet loss rate was much higher when in the deep orchard. The test of long distance communication module showed that the PLC (power line communication) Module (Zinwell PWQ-5101) had few chances to establish a successful data link while the GPRS and high power WiFi module held a stable data link between the remote monitoring terminal and the control system. The system was utilized for irrigation control, irrigation valves were turned on every day at 8:00 am, the collected soil moisture showed a rapid increase when valves were turned on and decreased slowly after irrigation valves were turned off, the time control error was less than 5 minutes and soil moisture rate was maintained above 13% during experiment periods. These tests proved that this system could be suitable for mountain orchards in southern China. [ABSTRACT FROM AUTHOR]

Associated with the construction of national level experimental teaching demonstration center and the practice of integrative experiment with the mode of opening in our university, the idea of integrating the integrative experiment with EDA and with MCU ( Micro Controller Unit), respectively, are discussed. The practical works are introduced. As a result, it is suitable for improving students ' practical ability and exploring spirit with favorable effect. [ABSTRACT FROM AUTHOR]

The memory space and bandwidth may be limited in speech signal communication. To solve the problem, a low rate speech coding and decoding system has been developed to realize speech communication with a high condensation. This system is composed of micro-controller STM32, special speech processor TR600, speech codec chip TLV320AIC10, speech acquisition and playback circuit. This design can code and decode speech in 0. 6 Kbps, 0. 8 Kbps, 1. 2 Kbps and 2. 4 Kbps. The tests show that the system' s reconstructive speech could maintain high naturalness, articulation and intelligibility, hence it reflects the design is feasible, stable and valuable. [ABSTRACT FROM AUTHOR]

An experimental equipment based on MSP430F6736 is developed in this paper. MSP430F6736 is an advanced product of Texas Instruments ' MSP430 series microcontroller. It has rich integrated resources. This experimental equipment mainly consists of MSP430 minimum system, a power module, an analog input and output module, a digital input and output module. In this experimental equipment, power module is improved that can switch power inputs among three power sources ( adapter, USB and lion-battery) automatically. Users can conduct six kinds of experiments including an IIO experiment, a timer experiment, a storage experiment, an input and display experiment, a serial communication and wireless communication experiment, an instrumental experiment. It fits for university students of automation and electrical major very well. [ABSTRACT FROM AUTHOR]

Usually, the measuring instrument for magnetic materials exists the problem that an instrument only completes a single measurement, its price is high price, and a large amount of data need to be processed. To solve this problem, a multifunctional measuring instrument which can measure dynamic hysteresis loop, remanence, coercivity, permeability and magnetostrictive materials magnetostrictive coefficient is introduced in this paper. Double-wire method is used to measure the dynamic hysteresis loop and the related parameters, and resistance strain gauge method combined with non equilibrium bridge is used to measure magnetostriction coefficient. The functions described above are unified through the circuit design, and the buttons on the panel control function switch. The A/D which is handled by the microcontroller collects data, and the measurement result is displayed on the LCD screen directly. This instrument realizes many functions, saves the experimental cost, and eliminates the conventional processing of the data. [ABSTRACT FROM AUTHOR]

We adopt LPC2103 as main CPU of the system to collect the signals of incremental rotary encoder and achieve pulse counting and distinguishing direction. Via RS232 communication, we achieve reverse counting and other fuctions. [ABSTRACT FROM AUTHOR]

ATMEG48 microcontroller was the core of the design and it completed the whole system function of information processing and coordination. The door interlock system was achieved through an infrared control system designed with implementation of the eight interlock control functions. The infrared identification, door number selection, interlock control, access control and other technologies was combined in this design. [ABSTRACT FROM AUTHOR]

The design of an intelligent electronic ruler for garment is based on MSP430 microcontroller. It can measure the garment dimensions, store and transmit the measurement data using optical encoder technology, liquid crystal display technology, the external EEPROM data storage technology, as well as the USB communication technology. [ABSTRACT FROM AUTHOR]

To improve the fabric quality and meet the high-speed, high-performance requirements of air-jet looms, an AC servo-based air-jet loom warp tension control system was designed grounding on the AC servo system's high control accuracy and ARM microcontroller LPC2294. Theoretical analysis and integrated design of servo system in terms of the warp tension design were completed. The system can satisfy the high-speed and high-performance requirements of air-jet looms, and can maintain the tension stability of warps. [ABSTRACT FROM AUTHOR]