I got a little problem I don't understand.
I got a "Arduino" Pro Micro. It is basically a very little Arduino Clone that's detected as "Arduino Leonardo". I want to detect if my digital Piano is on and I am trying to use the Midi Out Port of the Piano.
I measured with nothing connected and found that if off I get 0.2V and if it is on I get 3.2V on one Pin.
So I bought a Midi 5 pin port and a Midi cable and connected everything up. I just connect the ground and the VCC Pin from the Midi connector were I measured 3.2V. But as soon as I connect that Pin to the "Arduino" the Voltage rises to 3.3V and my Arduino measures "1023" even when the Piano is off.
Can anyone explain that behavior? I honestly don't get it, but maybe I don't see the obvios?.