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64 lines
1.9 KiB
Markdown
64 lines
1.9 KiB
Markdown
# Pi-Pico-ExpressionPedal2Midi
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This is a Raspberry Pi Pico MicroPython project that takes an expression pedal input via a TRS 1/4" jack connected to ADC pins on the Pico, and outputs respective Midi CC messages via UART.
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Midi channel, CC number, and maximum and minimum values are customisable.
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The expression pedal is automatically calibrated. At startup, simply move your pedal from minimum to maximum. The values are determined accordingly, and CC messages will start being sent.
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## Recipe
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### Ingredients
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- Raspberry Pi Pico (loaded with MicroPython)
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- ¼” jack TRS socket
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- 5 pin DIN midi socket
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- 10Ω resistor
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- 33Ω resistor
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Optional: breadboard, 40 pin male headers, pin cables, scotch
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Power source:
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Either USB or 3xAA battery holder
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### Method
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1. Customise the midi settings in main.py. Season to taste
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2. Upload to your board using Thonny, or your favorite IDE.
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Now for the stuffing:
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#### Midi port
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Midi messages are sent via UART1. Here’s where we need the resistors to protect the board and your midi device.
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3. Connect a 10Ω resistor to pin 6 on the Pico (UART1 TX). T’other end of the resistor to pin 4 of your midi socket
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4. Connect a 33Ω resistor to pin 36 on the Pico (3V3 OUT). T’other end of the resistor to pin 5 of your midi socket
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5. Connect a Pico ground pin (any of 3, 8, 13, 18, 23, 28, or 33) to pin 2 of your midi socket
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You’re done here, next…
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#### Expression pedal jack
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The expression pedal is connected to ADC0 on the Pico.
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6. Connect the jack sleeve to Pico ground pin (any or 3, 8, 13, 18, 23, 28, or 33)
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7. Connect the jack ring to Pico pin 36 (ADC0)
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8. Connect the jack tip to Pico pin 31 (3V3 OUT)
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Jubilations, you’re done.
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Ashley Strahle
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https://github.com/ashstrahle
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