Uno R3 grounding problem

Community General Discussion
1

I have a UNO R3 that I am trying to connect to using the serial I/O interface and using a monitor program on a windows computer to do the communications to the device. The device I'm trying to connect to is a QRPLabs ProgRock frequency synthesizer. The manual shows how to connect the I/O and grounds lines between the two units to enable communication. This doesn't work. I noticed that I have 2 choices for the ground connection on either side of the board. The QRP forum mentions that the choice of where to make the ground will affect the I/O interfacing! Has anyone found this problem or something like it?
syd/wt1v

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Can you provide a link to the manual of the synthesizer so we know what you're talking about?

3

Just throwing this into the mix

Section on STAR grounds applies more to audio circuits.

4

Hi,
Can you please post the code you are attempting to use and a circuit diagram showing how you have everything connected?

Thanks.. Tom... :grinning: :+1: :coffee: :australia:

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