Hi,
I am not that advanced in electronics, so i am asking this question:
The pins on the arduino (A) do not deliver enough current for a seperate electronic component (B). Therefore I did connect this other device (B) with ground and Vcc to a laboratory power supply. To share data/information between my arduino (A) and the device (B) I use jumper wires to connect the pins, but I have no connection between the arduino (A) ground pin to the ground pin of the other device (B).
Do I have to connect a wire between the arduino ground pin and the device ground pin? By doing this, I would also connect the arduino ground pin to the power supply minus-output. Is this okay? I noticed that there is a voltage difference of 0,8 V between the ground of the device (B)/ minus-pin of power supply and the arduino ground (A).
Thanks