Wow!
After far too long debugging, I found out why one of my LEDs refused to turn off as it shoudl do.
With thanks to contributor DaveClark5 of the Arduino forum (https://forum.arduino.cc/index.php?topic=252797.) I learned that...
If your sketch has something like this in it:
Serial.begin(9600);
It will use the serial comm. On an Uno that's 0 and 1.
On Mega - you can change that I believe.
This is why the LED on pin 1 was always reading high, even when it was meant to be off.
The good news is that analogue pins can be used as digital outs.
After far too long debugging, I found out why one of my LEDs refused to turn off as it shoudl do.
With thanks to contributor DaveClark5 of the Arduino forum (https://forum.arduino.cc/index.php?topic=252797.) I learned that...
If your sketch has something like this in it:
Serial.begin(9600);
It will use the serial comm. On an Uno that's 0 and 1.
On Mega - you can change that I believe.
This is why the LED on pin 1 was always reading high, even when it was meant to be off.
The good news is that analogue pins can be used as digital outs.
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