Setting up the Raspberry Pi for Serial Read and Writeġ. Make use of our table and guide below to connect your serial connector to your Raspberry Pi. Wiring your RS232 to TTL adapter to your Raspberry Pi is a simple process, with it requiring only 4 of the GPIO connecting to be wired to the serial connector, even better all 4 GPIO pins needed are in a row, so it is easy to follow. We mainly did this as we didn’t have any female to female breadboard wire available to us.

You can connect the wires directly to the GPIO Pins or use the breadboard as a middleman as we did in this tutorial. On your RS232 to TTL adapter you should find at least four connections, some circuits do come with more connections, but the only four you need is: VCC (IC Power-supply pin), TX (Transmitted Data), RX (Received Data) and GND (Ground power-supply pin) Equipment Listīelow are all the bits and pieces that I used for this Raspberry Pi Serial Tutorial. If you’re interested, we have also go through the steps to handling Arduino’s serial reading and writing too, this in a separate tutorial.

We will also be teaching you how you would read and write data through the serial ports using the Python programming language, and this should give you a good idea how you would deal with standard serial devices and not just a loopback to the Raspberry Pi. You will be learning what GPIO pins you need to utilize to be able to wire up to your serial device to the Raspberry Pi, and we will also be showing the steps you must go through to allow the Raspberry Pi to read and write through the TX and RX GPIO pins.

We will be showing you how to do these serial writes by using an RS232 to TTL Adapter to create a loop back to the Raspberry Pi, and the same concept will work with any serial device.

Serial.write array of float