#define merah;
#define kuning;
#define hijau;
void setup() {
  // put your setup code here, to run once:
pinMode(1,OUTPUT);
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(1, HIGH);
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
delay(1000);
digitalWrite(1,LOW);
digitalWrite(2,LOW);
digitalWrite(3,LOW);
delay(1000);
}