code for kinesis foot pedal.

kinesis.ino

#include <Keyboard.h>

#define LEFT_PAD  PD0
#define MID_PAD   PD1
#define RIGHT_PAD PD2
#define LEFT_LED  PB0
#define MID_LED   PB1
#define RIGHT_LED PB2

bool leftState  = false;
bool midState   = false;
bool rightState = false;

void setup() {
  Serial.begin(9600);
  Keyboard.begin();
  pinMode(LEFT_PAD,  INPUT_PULLUP);
  pinMode(MID_PAD,   INPUT_PULLUP);
  pinMode(RIGHT_PAD, INPUT_PULLUP);
  pinMode(LEFT_LED,  OUTPUT);
  pinMode(MID_LED,   OUTPUT);
  pinMode(RIGHT_LED, OUTPUT);
}

void operatePress(uint8_t key, bool* state, uint8_t keyCode, uint8_t led_pin) {
  bool isPressed = digitalRead(key) == LOW;
  if (isPressed && *state == false) {
    Keyboard.press(keyCode);
    digitalWrite(led_pin, HIGH);
    *state = true;
  } else if (!isPressed && *state == true) {
    Keyboard.release(keyCode);
    digitalWrite(led_pin, LOW);
    *state = false;  
  }
}

void loop() {
  operatePress(LEFT_PAD, &leftState, KEY_F13, LEFT_LED);
  operatePress(MID_PAD, &midState, KEY_F14, MID_LED);
  operatePress(RIGHT_PAD, &rightState, KEY_F15, RIGHT_LED);
}