Button

int buttonState = 0;

void setup()

{

    pinMode(13, OUTPUT); // 13pin是Arduino內建LED的顯示角位

    pinMode(7, INPUT_PULLUP);   // 設定7pin是讀取訊號的位置

}

void loop()

{

    buttonState = digitalRead(7);

    if (buttonState == HIGH)

    {

        digitalWrite(13, LOW);

    }

    else

    {

        digitalWrite(13, HIGH);

    }

}