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Topic: 2-way Serial Communication between Arduinos (Read 787 times) previous topic - next topic


I'm attempting to set up two arduinos to send data back and forth between eachother. I can successfully send data from #1 to #2 but as soon as I connect a second wire from  the TX of #2 to the RX of #1, #2 appears to stop receiving data completely. I've looked into it a little further and I've found that #2's TX pin is held at a digital HIGH. If I connect this pin to another pin that is HIGH everything works fine, but as soon as I connect it to a LOW pin everything shuts down. Can anyone help me to understand how I can set up 2-way communication between the two arduinos?



Rx to Tx, Tx to Rx, Gnd to Gnd. Pretty basic.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.


Oops. I forgot the GND to GND part. Thanks.

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