long ledm = 3;
  long ledk = 2;// put your setup code here, to run once:
  long ledh = 4;

void setup() {
  Serial.begin(9600);// put your main code here, to run repeatedly:
pinMode(ledm, OUTPUT);
pinMode(ledk, OUTPUT);
pinMode(ledh, OUTPUT); }

void loop() {
  digitalWrite(ledm, HIGH);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, LOW);
  Serial.println("Merah nyala");
Serial.println("Kuning mati");
Serial.println("Hijau mati");
Serial.println(" ");
 delay(3000);
 digitalWrite(ledm, LOW);
  digitalWrite(ledk, HIGH);
  digitalWrite(ledh, LOW);
  Serial.println("Merah mati");
Serial.println("Kuning nyala");
Serial.println("Hijau mati");
Serial.println(" ");
 delay(2000);
 digitalWrite(ledm, LOW);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, HIGH);
  Serial.println("Merah mati");
Serial.println("Kuning mati");
Serial.println("Hijau nyala");
Serial.println(" ");
 delay(2000);
 digitalWrite(ledm, LOW);
  digitalWrite(ledk, HIGH);
  digitalWrite(ledh, LOW);
  Serial.println("Merah mati");
Serial.println("Kuning nyala");
Serial.println("Hijau mati");
Serial.println(" ");
 delay(2000);
}