I want (eventually) to power my Arduino using MIDI inputs/output with a 9V adapter like this: adapter
MIDI also offer power but this seems quite unreliable (like 3V, 5V or uncertain, or none at all depending on the MIDI instrument).
Eventually I want to use 3 MIDI input ports, one output and (quite) some procoessing on an Arduino Mega.
- I heard ground loops in MIDI circuitry should be avoided ... is such cheap 9V adapter causing ground loops (or suspectible to do this)? Btw, I use opto-couplers but for power I need some external power.
- Is it anyway a good (or bad) idea to use a 9V adapter for MIDI solutions?
- What would be the problems if I use the power from MIDI?
- If I would want a 1602 or 2004 display module to be used, could I power it from the MIDI voltage pin or from the 9V adapter?
- If using the 9V adapter, is it a problem it runs at 9V while the Arduino runs on 5V? Should I get some extra circuitry or is this built in the Arduino already? Or are the pins working with +5v anyway even though a 9V adapter is used as power?
Sorry for maybe basic questions for you ... just I don't want to burn my Arduino (currently using an Uno, but ordered a Mega).
Thank you very much!