const int buttonPin = 2;
const int ledRed = 3;
const int ledYellow = 4;
const int ledGreen = 5;

int status = 0;
bool lastButtonState = LOW;



void setup() {
  // put your setup code here, to run once:
  pinMode(buttonPin, INPUT);
  pinMode(ledRed, OUTPUT);
  pinMode(ledYellow, OUTPUT);
  pinMode(ledGreen, OUTPUT);
  
}



void loop() {
  // put your main code here, to run repeatedly:
  bool tombolditekan = digitalRead(buttonPin);
  
  if (tombolditekan && !lastButtonState){
    status++;
    if (status > 2 ) status = 0;

    switch(status){
      case 1:
        digitalWrite(ledRed, HIGH);
        digitalWrite(ledYellow, LOW);
        digitalWrite(ledGreen, LOW);
        break;

      case 2:
        digitalWrite(ledRed, LOW);
        digitalWrite(ledYellow, HIGH);
        digitalWrite(ledGreen, LOW);
        break;

      case 0:
        digitalWrite(ledRed, LOW);
        digitalWrite(ledYellow, LOW);
        digitalWrite(ledGreen, HIGH);
        break;

        
        
        
        
        
        
        
        
    }
    delay(300);
  }

  lastButtonState = tombolditekan;

}