My seeeduino 4.2 output pins only output 3.5 volts with an open-circuit load. I verified this after it failed to turn on a SS relay with 5v input. I disconnected the relay from the output, thinking maybe it pulls too much current. Nope, 3.5 volts open.
I thought connecting a 12v source would fix this, but it didn’t. Anything else I can do? I probably don’t need exactly 5 volts out, but it should be close. My application needs to switch frequently, so a mechanical relay is a poor substitute.