int ledm = 8;
int ledk = 9;
int ledh =10;
  // put your setup code here, to run once:


void setup() {
Serial.begin(9600);
pinMode(ledm,OUTPUT );
pinMode(ledk,OUTPUT );
pinMode(ledh,OUTPUT );
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(ledm, HIGH);
digitalWrite(ledk, LOW);
digitalWrite(ledh, LOW);
Serial.println("Merah menyala");
delay(1000);
digitalWrite(ledm, LOW);
digitalWrite(ledk, HIGH);
digitalWrite(ledh, LOW);
Serial.println("kuning menyala");
delay(1000);
Serial.println("hijau menyala");
digitalWrite(ledm, LOW);
digitalWrite(ledk, LOW);
digitalWrite(ledh, HIGH);
delay(2000);
}