Hi,
I have an UNO rev. 3 that I can't get these digital pins to go to a "high" level. I'm using Windows 10 pro 1709 and version 1.8.5 of the IDE. I created a simple sketch to test if it was my code (in the original program) or something else (see below). This is a new Arduino. I have also done the loop back test (it passed) and I have uninstalled and reinstalled the IDE, sketch, and USB driver. I'm really frustrated at this point. Any help would really be appreciated.
Here's the code:
void setup() {
pinMode(10, OUTPUT);
}
void loop() {
digitalWrite(10, HIGH);
}
UPDATE:
I checked the continuity of the wires and the connections on the Arduino and they were good. A thought crossed my mind that perhaps the relay board I was using needed to be grounded to the Arduino in order to work. It turns out that was the issue (the relay board is a 5V 4 relay module available from RobotShop.)
Moderator, if you could mark this issue as solved and move it to the correct address that would be appreciated.