2.5.1-ButtonAndLED2.ino

/*
按键控制LED
奈何col
*/
int buttonPin = 2;
int ledPin = 13;
int buttonState = 0;

void setup()
{
  //初始化I/O口
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
}

void loop()
{
  buttonState = digitalRead(buttonPin);
  //按住按键时，点亮LED；放开按键后，熄灭LED。
  if (buttonState == HIGH)
  {
    digitalWrite(ledPin, LOW);
  }
  else
  {
    digitalWrite(ledPin, HIGH);
  }
}