Go Down

Topic: Serial1 does not work when powered by DC barrel instead of USB on Mega 2560 (Read 430 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?

Coding Badly


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. 

Go Up