How can I change the Marlin configuration on mega 2560 so pin 11(for example) becomes active low from active high in default?
I have a YwRobot MB V2 breadboard power supply. Using 9V to power it, I tried to use it to power a Nano it burned the Nano up. So I did what I should have done in the first place checked the voltage, the output was 13.5 Volts the jumpers are set for 5V. I then set the jumpers to 3.3 V and the output is 3.3 V.
It has a AMS1117 5.0 DN711 and a AMS1117 3.3 DN711. Why do I get 13.5 V when it is set for 5.0 V? I checked it with two different meters same results