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Internet of Things (IoT) technology can connect various household devices through the internet network. This technology can help to monitor and control devices in the home, so efficiency can occur. This paper discusses the design of a smartphone-based application that can control television via the internet, so that it can be controlled even if the user is not in the TV room. This system uses a NodeMCU microcontroller to control infrared-based TV remotes. In addition, NodeMCU can decode real-time Firebase databases connected to smartphone applications programmed by using the Flutter framework. The developed application has a function that resembles the function of a TV remote in general. In addition to having commands such as a TV remote, the application also has additional features such as: "go to channel", "turn off timer", and "volume preset". Commands given through the UI of the app are stored in Firebase. The NodeMCU executes the command and transmits it with an infrared signal. The command is in the form of a Boolean variable. The test results show that the system can execute every command from the HP with an average execution time of 880 milliseconds. [ABSTRACT FROM AUTHOR]

As the wheels of any moving bodies are not effective on rough areas, robot with legs incorporating Klann mechanism becomes advantageous for innovative walking vehicles. It can easily step over verges, climb stairs and move over areas that are not effortlessly accessible with wheels. This paper deals with the design and fabrication of a microcontroller based Spider Bot with six legs using Klann mechanism. One of the most important benefits of this mechanism is that, it is controlled by Arduino board which is then connected to a computer, where it is connected with the Arduino development environment. Any user can write the Arduino code and upload it to the microcontroller which executes the code, resulting in the required movement of the Spider Bot. The link mechanisms are coupled by pivot joints, which convert the rotary motion of the crank into foot movement which is similar to walking of an animal. This Spider Bot is useful while handling hazardous materials, clearing of minefields or securing any area without placing human beings at risk. Many segments of human forces like Military, Police units, Explosive Disposal units, Private security organisations, etc. could benefit from the application of this Spider Bot. It also performs well as a platform to handle stair cases and other hindrances when compared to wheeled vehicles. [ABSTRACT FROM AUTHOR]