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how do I use H11L1 correctly to receive MIDI?

Discussion in 'Physics' started by Rinaldo Jonathan, Oct 8, 2018.

  1. I was following this schematics. This is the first result on google images

    [​IMG]

    My Arduino Serial Monitor received nothing. I tried to replace the H11L1 with LED, and it does blink. but as soon as I connected the H11L1 (while keeping the LED in parrarel and not connecting the H11L1 to anything else), the LED stops blinking. Tried with and without resistors, also tried to reverse the cable.
    Then I plug out the H11L1, afraid to break my keyboard and the LED blinked again.

    EDIT :
    I was using Arduino Mega. I put it on reset mode by connecting Reset to GND. then I connected it like above and opened serial monitor. Nothing.
    Also I don't use capacitor, so I edited the image a little.

    Where do I start troubleshooting?

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