GNDに接触したらキー入力

sketch_apr26a.ino

#include <Keyboard.h>

bool leftPressed = false, rightPressed = false;
bool left2Pressed = false, right2Pressed = false;

void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);

  Keyboard.begin();
}

void loop() {
  int8_t leftState, rightState;
  int8_t left2State, right2State;

  leftState = digitalRead(2);
  rightState = digitalRead(3);
  left2State = digitalRead(5);
  right2State = digitalRead(6);
  
  // put your main code here, to run repeatedly:
  if (leftState == LOW) {
    if (!leftPressed) {
      Keyboard.print("L");
      leftPressed = true;
    }
  } else if (leftState == HIGH) {
    leftPressed = false;
  }

  if (rightState == LOW) {
    if (!rightPressed) {
      Keyboard.print("R");
      rightPressed = true;
    }
  } else if (rightState == HIGH) {
    rightPressed = false;
  }

  if (left2State == LOW) {
    if (!left2Pressed) {
      Keyboard.print("M");
      left2Pressed = true;
    }
  } else if (left2State == HIGH) {
    left2Pressed = false;
  }

  if (right2State == LOW) {
    if (!right2Pressed) {
      Keyboard.print("S");
      right2Pressed = true;
    }
  } else if (right2State == HIGH) {
    right2Pressed = false;
  }

  delay(16);
}