int red=12,yellow=14,green=27;
void setup() {
Serial.begin(115200);
pinMode(red, OUTPUT);
pinMode(yellow, OUTPUT);
pinMode(green, OUTPUT);
}
void loop()
{
switchOnLED(red);
switchOnLED(yellow);
switchOnLED(green);
}
void switchOnLED(int LED)
{
digitalWrite(LED, HIGH);
delay(3000); // 3 seconds delay
digitalWrite(LED, LOW);
}