i want to ask whether uno can serial.print strings while receiving strings through tx rx. i use one uno send "aaa"to the other in the loop, when the second receiving "a",it will send "bbb"to the first one. when i disconnect the second uno tx to the first uno rx,i find the second send "bbb"correctly …

serial communication

septillion November 1, 2017, 3:52pm 2

Show a diagram (no Fritzing mess) how it's connected and show you're program.

Also, which Arduino(s)?

Tip! You're keyboard comes with a shift key

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