【Arduino入門】從序列埠控制LED開關

				
					const byte LED = 13;
char val;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  Serial.println("Welcome to Arduino");
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available()) {       //查看序列埠是否有指令
    val = Serial.read();          //將讀取到的指令,付與給val
    if (val == '1') {             //如果val的值為1
      digitalWrite(LED, HIGH);    //開啟LED
      Serial.println("LED ON");   //序列埠列印出LED ON
    } else if (val == '0') {      //否則如果val的值為0
      digitalWrite(LED, LOW);     //關閉LED
      Serial.println("LED OFF");  //序列埠列印出LED OFF
    }
  }
}