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Topic: Serial1 does not work when powered by DC barrel instead of USB on Mega 2560 (Read 443 times) previous topic - next topic

plbyrd

Hi!

I have a project on my Mega 2560 that uses TTL serial from Serial1 to a Commodore 64's serial port.  This works great when plugged into the USB from the PC where I develop the sketch, but it doesn't work when disconnected from the PC and being powered by 12VDc on the barrel plug.  Any ideas why?


plbyrd

No, grounds are not connected.  I need another wire to do that.  I'll get that done and post the results.

plbyrd


No, grounds are not connected.  I need another wire to do that.  I'll get that done and post the results.


That was it!  Thanks for the hint. 

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