int ledungu = 13;
int ledkuning= 12;
int ledhijau = 11;

void setup() {
pinMode(ledungu, OUTPUT);
pinMode(ledkuning, OUTPUT);
pinMode(ledhijau, OUTPUT);
digitalWrite(ledungu, LOW);
digitalWrite(ledkuning, LOW);
digitalWrite(ledhijau, LOW);
}
void loop(){
digitalWrite(ledungu, HIGH); 
delay(2000);
digitalWrite(ledungu, LOW); 
delay(1000);
digitalWrite(ledkuning, HIGH); 
delay(2000);
digitalWrite(ledkuning, LOW); 
delay(1000);
digitalWrite(ledhijau, HIGH); 
delay(2000);
digitalWrite(ledhijau, LOW); 
delay(1000);
}