Configure the serial port on Raspberry Pi

If you have an older Raspbian image then these instructions may work for you.

The Raspberry Pi uses the serial port as a monitor, by default, so you will need to disable this so that you can use the serial port for the base station receiver.

Run the Raspberry Pi configuration tool to disable the serial port:


Select the Interfacing Options menu option:

Followed by Serial menu option, 

then select NO to the question "Would you like a login shell to be accessible over serial?". 

Then "Yes" to "Would you like the serial port hardware to be enabled?".

Exit save and reboot. 

Special instructions for Raspberry Pi 3 only:

You need to disable Bluetooth so that the serial port will work.

Edit boot.txt

sudo nano /boot/cmdLine.txt

Page down to the bottom of the file and add the following line:

Add the following line:


Exit, save and reboot.