![]() Also it has a LCD 16x2 display to show the angle value that is received from Raspberry Pi. Raspberry Pi is used as Master and the Arduino UNO with servo motor is used as slave. In this tutorial the angle of the servo motor connected with Arduino UNO is controlled by sending angle values from Raspberry Pi to Arduino UNO through RS-485 Serial communication. It provides a Half-Duplex communication when using two wires and Full-Duplex requires 4 fours wires. So what is differential signal transfer method?ĭifferential signal method works by creating a differential voltage by using a positive and negative 5V. ![]() It uses a technique called differential signal to transfer binary data from one device to another. ![]() RS-485 is an asynchronous serial communication protocol which doesn’t not require clock.
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