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 jus…

[Solved] Arduino MEGA Digital I/O Issues

Coding_Badly August 25, 2012, 3:48am 2

Did you forget to configure the pin as an output?

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