// nilai yang disimpan
int n = 0;

// LED
int r = 11;
int y = 12;
int g = 13;

//pushbutton
int t = 3;


void setup() {
  pinMode(r, OUTPUT);
  pinMode(y, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(t, INPUT);
}

void loop() {
if(digitalRead(t)==HIGH){
  n++;
}

if(n==0){
    digitalWrite(r, LOW);
    digitalWrite(y, LOW);
    digitalWrite(g, LOW);
}

else if(n==1){
    digitalWrite(r, HIGH);
    digitalWrite(y, LOW);
    digitalWrite(g, LOW);
  }

else if(n==2){
    digitalWrite(r, LOW);
    digitalWrite(y, HIGH);
    digitalWrite(g, LOW);
  }

else if(n==3){
    digitalWrite(r, LOW);
    digitalWrite(y, LOW);
    digitalWrite(g, HIGH);
  }
else {
   n=0;
}

delay(200);
}