I’m new to Arduino and electronics in general. I’m trying to receive midi signal from my keyboard to arduino and after 2 days of trying, I finally got it working using 10k resistor on 6th pin instead of 220Ohm I saw in some schemes.
I am using 5V from Arduino to power circuit and I have strange issues with grounding 5th pin on 6n137. If I put GND wire from Arduino right next to 5th pin on breadboard (Picture 1) - it works,
but if I put GND to blue rail and then connect 5th pin to blue rail (Picture 2), it won’t work. I tried all blue rails on my breadboard (they worked on previous circuits) and also tried using few 5-pin rail just to simulate bridge, and the only way 6n137 gives results is if I place GND directly from Arduino right next to 6n137.
Any idea why this could be? Could it be that wire’s resistance is too high? I also tried very short wires that I cut from spare resistors, and still not getting any results.
Here are photos: (I can’t upload since I’m new on the forum)