I´m currently having troubles to get my Midi input working on a Teensy 3.6. I'm using the Midi library 4.3.1.
Maybe I didn't wire up my Din Midi connectors properly. Could you have a quick look?
The yellow wire is connected to the same pin on the optoisolator as the diode. Either the wire or the diode needs to be moved to the left one pin. I don't know which without looking up the circuit.
Definitely not correct. The resistor is supposed to connect to pin 1 on the PC900 (but in the picture it's connected to the diode and not connected to the PC900 at all). The diode is supposed to connect between pins 1 and 2 on the PC900.