2019-03-23, 01:15 AM
I have not had much luck with the software port /dev/ttyS0
It is better to enable the hardware uart, reboot and ensure you have /dev/ttyAMA0 and nothing is using this port already, then it should work fine talking to the arduino.
It is better to enable the hardware uart, reboot and ensure you have /dev/ttyAMA0 and nothing is using this port already, then it should work fine talking to the arduino.