first of all, sorry for posting here, but somehow I cannot post in the sub “general electronics”. If a mod is seeing this, please feel free to move this topic.
for a bigger project I am currently trying to connect my e-piano (Korg SP 100) to my arduino (Uno) with the help of a self made midi input circuit. I am following this instruction Notes and Volts: Midi for the Arduino - Build a Midi Input Circuit. The code can be found here Notes and Volts: MIDI for the Arduino - Arduino MIDI Library Input Test.
So far I set up the circuit and got the program code running on the Arduino. But somehow when I connect my piano with the circuit and play a note nothing happens. Either way the circuit is wrong or a component is broken. So i want to check every component, starting with the midi output of my piano. Question is, how can I check it if its working? Tried to use a voltmeter, but I read, that the interval of the current is too short to be measured. Another idea was to set up a small circuit with an LED and a 220 ohm resistor to connect the pin 4 and 5 of the midi output and see if I get a light signals that way. I tried and didnt get any, so either the midi is really broken or I used the wrong methods of testing.
Anyone has any ideas, what else I could do or how I could test the midi output of my piano? Buying a usb-midi cable is of course an option, but will take one week to be delivered. So maybe the is a faster solution.