交通號誌模擬程式碼（使用紅、黃、綠三顆 LED）

 

const int greenLed = 2;

const int yellowLed = 3;

const int redLed = 4;

void setup() {

  pinMode(greenLed, OUTPUT);

  pinMode(yellowLed, OUTPUT);

  pinMode(redLed, OUTPUT);

}

void loop() {

  // 綠燈亮 7 秒

  digitalWrite(greenLed, HIGH);

  digitalWrite(yellowLed, LOW);

  digitalWrite(redLed, LOW);

  delay(7000);

  // 黃燈亮 2 秒

  digitalWrite(greenLed, LOW);

  digitalWrite(yellowLed, HIGH);

  digitalWrite(redLed, LOW);

  delay(2000);

  // 紅燈亮 7 秒

  digitalWrite(greenLed, LOW);

  digitalWrite(yellowLed, LOW);

  digitalWrite(redLed, HIGH);

  delay(7000);

}