UART means “Universal Asynchronous Reception and Transmission”. pi@raspberrypi $ ls /dev/ttty*. By default the Raspberry Pi uses the UART in two ways: Console Messages (including bootup messages) A getty so you can login via serial; To use this serial port for your own uses you need to disable these two services. More specifically, when you use Serial with Arduino and Raspberry Pi, you’re using the UART protocol. This way, we can separate the computing intensive tasks (done by the Raspberry Pi) and controlling tasks (done by the Arduino).

The command means to list out all the ports with the beginning of "tty". Step 2: Go to the Device Manager and find the port number that is connected to the converter. There shall be a new port appears; if that is the case, the new name is the port name of your Arduino. To show how this works the Arduino is running a small program that reads from the Raspberry Pi’s and copies this to my PC via USB. Then connects the two devices with your USB cable, and type in the command above again. Save the file, Ctrl + O. For our project, we will use an Arduino Uno which has only one UART interface found on pin 0 (RX0) and pin 1 (TX0). You can verify whether the Pi is sending and receiving UART data by installing the tool Minicom. Arduino has one or more UART pins depending on the board. For example, if you have sensors, motors, and actuators, you can connect these to the Arduino and make the Arduino send values to and from the Raspberry Pi. Now you have freed the UART pins. Follow the steps below to start the Raspberry Pi UART communication: Step 1: Connect the serial to USB converter to the Raspberry Pi board as is shown in the circuit.
Raspberry Pi Serial console. Close the editor, Ctrl + X. Reboot Raspberry Pi by using the command, sudo reboot. The Arduino pins 0 and 1 are also used for communicating with the Arduino IDE via the USB.

Arduino UART Interface. Sometimes you may need to connect an Arduino to a Raspberry Pi. Basically it’s an asynchronous multi-master protocol based on the Serial communication, which …