[Solved] Arduino MEGA Digital I/O Issues

Development Tools IDE 1.x
1

I just got myself an Arduino MEGA R3 for an upcoming project and every digital I/O pin except pin 13 falls at roughly 3.5 volts with very little current.

For example, while running a basic blink sketch on all pins, I can connect an LED to pin 13 through a 220 ohm resistor and It will illuminate just fine. However, if I use that same setup but swap pin 13 for say, pin 12, then the LED will light up very very dimly and the voltage will drop to ~1.5v
Choosing a different ground pin or different LED does not solve the issue.

Any ideas?

2

Did you forget to configure the pin as an output?

3

D'oh!
Ya, that was the problem... I've been up for way too long.. :sweat_smile:

Thanks, and sorry for your time.