Tested on Arduino Uno (my test/debug platform) and Arduino Nano Pro (the current final hardware).
- Arduino Pro Nano
- 3x 220ohm resistors
- 1x 4.7kohm resistor
- 1x 1n4001 diode
- 1x 3v red LED
- 1x momentary, normally-open pushbutton foot switch
- 1x 3.5mm TRS audio jack
- 1x 5.5mm (2.1mm inner) power barrel jack
- 1x Hammond 1590A enclosure
- second LED for active/clear
- variable measure length
- CV out