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My MIDI synced PT-2399 delay now has a display and user-selectable delay time (but no enclosure yet)

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Here's a slight update to my MIDI synced PT-2399 delay from https://diode.zone/w/9Xe4J655RLJfx9uWtyrZLh

I replaced the Arduino Uno with a Nano and added an OLED display and one more potentiometer. After a bit of code fiddling the display now shows the (approximate) MIDI clock tempo, as well as the first and second beat of each bar (the latter was a bit of an unintentional accident).

Using the new pot I can now choose different echo intervals - triplets, dotted and whole notes. (For the video I removed the dotted notes as these didn't really work with the tripletty demo track)

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The project is just a mashup of several tutorials I found online:

  • The most crucial one is "MIDI synchronized echo with PT2399" by DZL:
    • http://blog.dzl.dk/2018/03/20/midi-synchronized-echo-with-pt2399/
  • The MIDI input circuit is based on the trusty "MIDI for the Arduino" tutorial by the excellent Notes and Volts:
    • https://yewtu.be/GxfHijjn0ZM
  • Finally, Dud on the LOOK MUM NO COMPUTER forum posted a great list of mods for the module, of which I implemented a bunch:
    • https://lookmumnocomputer.discourse.group/t/cheap-pt2399-reverb-delay-module-diy/801

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    These things are still on my wishlist for future versions:

    • A wet and dry output
    • Stereo delay using a second PT2399 module
    • Control of the MIDI delay interval via MIDI CC
    • a tap function when in manual mode
      • ...more
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