const int LED_Merah=19,LED_Kuning=18,LED_Hijau=5,Push_Button=15;
int nilai;
int status=0;
unsigned long WaktuSebelum = 0;  
unsigned long Interval = 50;   

void setup(){
Serial.begin(9600);
pinMode(LED_Merah,OUTPUT);
pinMode(LED_Kuning,OUTPUT);
pinMode(LED_Hijau,OUTPUT);
pinMode(Push_Button, INPUT);
digitalWrite(LED_Hijau,LOW);
digitalWrite(LED_Merah,LOW);
digitalWrite(LED_Kuning,LOW);
}
void loop(){
if(digitalRead(Push_Button)==HIGH && status==0 && nilai==0){
  nilai=1;
  Serial.println("Button Ditekan - LED Merah  ON" );
  WaktuSebelum=millis();}


if(nilai==1 && millis() - WaktuSebelum>Interval){
digitalWrite(LED_Hijau,LOW);
digitalWrite(LED_Kuning,LOW);
digitalWrite(LED_Merah,HIGH);
if(digitalRead(Push_Button)==LOW){
  status=1;}
if(digitalRead(Push_Button)==HIGH && status==1){
  Serial.println("Button Ditekan - LED Kuning ON" );
  WaktuSebelum=millis();
  nilai=2;}} 

else if(nilai==2 && millis() - WaktuSebelum>Interval  ){
digitalWrite(LED_Merah,LOW);
digitalWrite(LED_Kuning,HIGH);
digitalWrite(LED_Hijau,LOW);
if(digitalRead(Push_Button)==LOW){
  status=2;}
if(digitalRead(Push_Button)==HIGH && status==2){
  Serial.println("Button Ditekan - LED Hijau  ON" );
  WaktuSebelum=millis();
  nilai=3;}}

else if(nilai==3 && millis() - WaktuSebelum>Interval  ){
digitalWrite(LED_Merah,LOW);
digitalWrite(LED_Kuning,LOW);
digitalWrite(LED_Hijau,HIGH);
if(digitalRead(Push_Button)==LOW){ 
  status=3;}
if(digitalRead(Push_Button)==HIGH && status==3){
  WaktuSebelum=millis();
  status=0;
  nilai=0;}}






/*

switch(nilai2){
case 0:
if(digitalRead(Push_Button)==HIGH){
  nilai++;
  if(nilai>3){
    nilai=1;
  }nilai2=1;}
break;

case 1:
if(digitalRead(Push_Button)==LOW){
  nilai2=0;}
break;


}



switch(nilai){


case 0:
digitalWrite(LED_Hijau,LOW);
digitalWrite(LED_Merah,LOW);
digitalWrite(LED_Kuning,LOW);
break;

case 1:
digitalWrite(LED_Merah,HIGH);
digitalWrite(LED_Kuning,LOW);
digitalWrite(LED_Hijau,LOW);
break;

case 2:
digitalWrite(LED_Kuning,HIGH);
digitalWrite(LED_Merah,LOW);
digitalWrite(LED_Hijau,LOW);
break;

case 3:
digitalWrite(LED_Hijau,HIGH);
digitalWrite(LED_Merah,LOW);
digitalWrite(LED_Kuning,LOW);
break;




}

*/



}