Build Instructions

Collapse

• 1

  Get the components

  Good news: it's 2018 and all we need is easily source-able. You will also need a screwdriver for assembly. A parts list with example parts is provided on the project page.

• 2

  Wire stuff up

  2nd good news: two jumper wires suffice. No need for soldering. Just use the screwdriver  (see step 1 ;)) and replicate what is seen on the image here.

  • Open pedal
  • connect USB extension cable to Digispark
  • connect jumper wires to terminal block
  • connect jumper wires to Digispark: black wire goes to GND, yellow to P2=D2 (or change the sketch in step 3)
  • Close it
• 3

  Install the sketch

  Now, this is what we want: every kick is a single key press (press+release) of the delete key (better: back-space, key code 0x24; yes, I am on a Mac).

  // Public domain
  #include "DigiKeyboard.h"
  
  const int LEDA=0;
  const int LEDB=1;
  const int BUTTON=2;
  
  void setup() {
    pinMode(BUTTON,INPUT_PULLUP);
    pinMode(LEDA,OUTPUT);
    pinMode(LEDB,OUTPUT);
  }
  
  void loop() {
    while (digitalRead(BUTTON)==HIGH) DigiKeyboard.delay(10); // <- important to have USB stuff still running in BG.
    digitalWrite(LEDA,HIGH);
    digitalWrite(LEDB,HIGH);
    DigiKeyboard.sendKeyStroke(0);
    DigiKeyboard.sendKeyStroke(0x2A);
    DigiKeyboard.delay(100);
    while (digitalRead(BUTTON)==LOW) DigiKeyboard.delay(10);
    digitalWrite(LEDA,LOW);
    digitalWrite(LEDB,LOW);
    DigiKeyboard.delay(100);
  }

  Some comments:

  • I use quite some debouncing delays. 
  • The while loop waiting for the pedal press really needs to call a DigiKeyboard.delay to make sure that USB is not stalling.

  Upload using the instructions here: https://digistump.com/wiki/digispark/tutorials/connecting

View all 4 instructions