2025-02-22 (Sa) EWC_Soother MIDI input

I swapped the wires to the MIDI output port and confirmed that it worked by uploading code that sent a valid MIDI command at startup. I verified that I could receive it with a laptop. I monitored the microcontroller via USB and sent MIDI commands to the input port, but it did not work. In the next test, I put a standard cable from the input to the output, and the serial port spat out a continuous stream of useless data. I checked the serial port with PuTTY.exe running at the MIDI baud rate, but the result was the same. I moved the serial port to pin 15 so I could use my 10kΩ pull-up resistor, but that did not help. Next, I reversed the wires between the microcontroller and the opto-isolator, but that did not help. I ran out of guesses, so I built the input circuit on a solderless breadboard and wired it to the DIN port and microcontroller. I built a configuration that worked and documented it to revise the schematic to match.

The serial input circuit is capable of working

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2025-02-15