Which OS are you running on the Pi4?
Have you done a "loopback" test on the Pi with a wire connecting TX to RX (GPIO14/15) to check that serial in/out is working OK?
I am assuming that the 5V Arduino UNO has NOT been directly connected to the 3V3 inputs of the Pi.
Have you done a "loopback" test on the Pi with a wire connecting TX to RX (GPIO14/15) to check that serial in/out is working OK?
I am assuming that the 5V Arduino UNO has NOT been directly connected to the 3V3 inputs of the Pi.
Statistics: Posted by neilgl — Sun Nov 10, 2024 4:09 pm