I love this forum, I have done 2 other posts and both times solved it.
I have a 4 channel relay that I can figure out what im doing wrong, it works when powered directly from the Arduino 5v pin, the relays lights flash as they should but they dont engage, I guess because the power from the 5v pin is so low.
My Problem is when all i change is 5v power from an external source, instead of the Arduino, nothing happens, no relay lights at all.
Im at a loss, I think maybe its not earthed properly?
13 posts - 4 participants