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Pada sistem hidroponik deep flow technique (DFT), setiap umur dan jenis tanaman yang ditanam memerlukan total dissolved solids (TDS) dengan satuan ppm yang berbeda serta kegagalan tanaman dalam bertumbuh dapat terjadi jika nilai TDS tidak terpantau dengan baik. Tujuan dalam penelitian ini untuk membuat sistem kendali nilai TDS dengan metode fuzzy logic agar nilai TDS sesuai dengan kondisi tanaman yang ditanam serta membuat sistem pemantau nilai TDS dengan memanfaatkan Internet of Things (IoT) agar nilai TDS dapat terpantau dengan baik. Sistem ini menggunakan nilai error dan delta error yang didapat dari selisih nilai setpoint dengan sensor TDS SKU:SEN0244 sebagai masukan fuzzy logic. Keluaran sistem berupa durasi ON dan OFF relay yang terhubung dengan pompa air 12 VDC. Nilai setpoint dan bacaan sensor akan ditampilkan pada LCD serta ditampilkan juga pada aplikasi Android Blynk dengan menggunakan module WiFi NodeMCU ESP8266 sebagai wireless. Hasil pengujian dari sistem yang dirancang yaitu sensor TDS yang digunakan memiliki rata-rata error sebesar 0,165%. Pengendalian yang dirancang mampu menghasilkan nilai integral absolute error (IAE) terkecil sebesar 1119 pada setpoint 800 ppm dan integral time absolute error (ITAE) terkecil sebesar 4200 pada setpoint 1000 ppm.

In hydroponic cultivation sites, pH control is still carried manually by checking the pH level with a pH meter and providing a pH balancing liquid manually. This study aims to design an automatic pH control system in the Deep Flow Technique (DFT) hydroponic system that uses the Internet of Things (IoT) based Fuzzy Logic Controller (FLC). The SKU SEN0161 sensor detects the pH value as FLC inputs in an error value and its changes. These inputs are processed using Mamdani FLC embedded in the Arduino Mega 2560 microcontroller. The FLC produces an output in a pH liquid feeding duration using the peristaltic pump. The results showed that FLC could maintain the pH value according to the set point with a settling time of less than 50 seconds, both with disturbance by adding pH liquid and without disturbance. The pH value can also be displayed on the website interface system as a monitoring system.

This paper presents a pair of portable wireless nodes for a smart agricultural system to control and monitor the agricultural parameters based on Internet of Things (IoT). This system utilizes low-cost wireless communication through an nRF24L01 module between the sensor node and the controller node. The sensor node is placed on the agricultural area with a Li-Ion battery as a power supply, while the controller node is placed at the control and monitoring station. On the sensor node, there is a YL-69 soil moisture sensor and DS18B20 temperature sensor, while in the controller node there is a relay that can set watering on/off condition. In the controller node, there is also an ESP8266 WiFi module that serves to send data to the internet cloud for user monitoring. Both hardware nodes are built in small and portable size. The experimental result shows that the sensor node can transmit soil moisture and temperature data via RF wireless communication to the controller node. Watering is done automatically based on the condition of sensor values. In addition, this system can also be monitored through a website interface, so the users can easily find out the condition of their plant as long as there is internet access.

Control and monitoring systems of the water level tank is one of electrical, computer instrumentation that needed in industrial process. This paper presents control and monitoring systems of water level in a tank based on ultrasonic sensor. The ultrasonic sensor is a device that can measure the distance of an object by using ultrasonic wave deflection. The control system is designed using relay as a switch which is controlled by a microcontroller with hysteresis control law. For monitoring and measurement data, the interface device is also designed using the Processing software in form of graphic, bar chart, pump state, and charging/discharging duration. Testing result shows that the ultrasonic sensor that used able to measure water level of 5 cm to 25 cm with error measurement 4.93%. A hysteresis control system that designed can produce output responses according to the setpoint value without generating relay’s chattering. As an addition, monitoring system of water level can be displayed in the form of a software interface on the Processing interactively.

Supercapacitor is one of electrical energy sources that have faster charging-discharging times when compared to other power sources, such as battery and fuel cell. Therefore, it is often used as an additional power source in an electric vehicle. In this paper, a prototype of small-scale electric vehicle simulator (EVS) is built and a simple charging scheme of supercapacitor is used for education purpose. EVS is an electric vehicle prototype which can show the vehicle’s powertrain on small-scale configuration. Main components of this device are two direct current motors (DCMs) with a linked axis of rotation. Therefore one of them will be able to act as a generator. The supercapacitor charging scheme is employed by controlling the relays. The hardware experimental result shows that the averages of charging current are proportional to the maximum slope angle of the road profiles. This scheme is simple due to the EVS utility and it is useful for education purpose.

This paper proposes a clause-based extractive summarization algorithm by ranking and extracting semantic clauses from the original document. Discourse structure relation is useful for identifying semantically important parts of the source document. We segment the document into clauses and evaluate the importance of clauses based on semantic relations, and then, rank and extract them coarsely, and utilize graph rank to refine the extracted clauses. This way can create a more concise summary with more information and less redundancy. Research reach the following results: 1) compared with the other summarization algorithms on different granularity, the clausebased summarization achieves higher recall score; and, 2) different discourse relations have different importance.

The main aim of Software Engineering is to develop a software system, which fulfils the user requirements within time and budget constraints. This paper uses the multi-dimensional Resource Space Model to manage multiple types of software engineering processes and maps their features into multiple dimensions for supporting analysis, development and maintenance of software system. Two case studies show that the Resource Space Model is feasible to use for managing the software processes and data.

The Resource Space Model is a unified semantic model that can manage big data from multiple dimensions and support multi-dimensional user interface. This paper introduces the design and development of the multi-dimensional interface that adopts the Resource Space Model, and shows its advantages in real property letting application. The interface can help users better understand data and facilitate operation, compared with other data visualization interface. The implementation, architecture and technology are also introduced. This visualization software can run on major platforms including windows, mac and Linux.

Supercapacitors are electrical components which have a higher capacity of storing energy compared to a normal capacitor. It also has a quick charging and discharging time in comparison to other sources of electrical energy. Due to this advantage, supercapacitors are often used as an additional energy source in an electric car. During regenerative braking, the supercapacitor can be charged and hence store electrical energy more quickly. In this paper, a simple supercapacitor charging scheme was designed during the regenerative braking in an electric car. The designed charging scheme of supercapacitor is then implemented and tested in electric car simulator. The simulator was firstly built based on a previously published simulator known as Protodrive. The main components of the simulator are two direct current motors (DCMs) with a linked axis of rotation. The scheme is then tested in the simulator by using three profiles of a designed road, i.e. one hill, two hills and trapezoidal road's contour. The test result shows that the amount of supercapacitor charging current is proportional to the amount of road profile's slope angle.

Finite State Machine (FSM) is a control system methodology that describes system’s behavior using three things, namely: state, event, and action. On a program, the system would be in one active state. The system can switch or move to another state if it gets a certain input or event. In this paper, FSM based on Proportional-Integral-Derivative (PID) controller algorithm will be implemented on line follower robot. PID controller is one of system control methods that many used recently. FSM based on PID controller is implemented to keep robot tracking the line trajectory as well. The test result shows that designed algorithm can work well and can be used as a based algorithm of this robot.Keywords: algorithm, Finite State Machine (FSM), Proportional-Integral-Derivative (PID), robot, line follower