int timer = 1000;         //set the timer
int ledPin1 = 1;          
int ledPin2 = 2;
int ledPin3 = 3;           
const int buzzer = 4;     
const int button1= 8;
const int button2= 9;
const int button3= 10;
void setup() {

  // use a for loop to initialize each pin as an output:

  for (int thisPin = 1; thisPin < 5; thisPin++) {

    pinMode(thisPin, OUTPUT);
    pinMode(buzzer, OUTPUT);
    pinMode(button1, INPUT_PULLUP);
    pinMode(button2, INPUT_PULLUP);
    pinMode(button3, INPUT_PULLUP);


  }
}

void loop() {

    //Configure the red button sequence
int value1=digitalRead((button1));
if(value1==0){
  for (int thisPin = 1; thisPin < 5; thisPin++) {  // loop from the lowest pin to the highest:     

    // turn the pin on:

    digitalWrite(thisPin, HIGH);
    delay(timer);
    
    if (thisPin == 4) {

      tone(buzzer,1000);
      delay(1000);
      noTone(buzzer);
      
    }

  
    // turn the pin off:

    digitalWrite(thisPin, LOW);

  }
    //loop pin from the highest straight
  for (int thisPin = 4; thisPin = 1;) {

    // turn the pin on:

    digitalWrite(thisPin, HIGH);

    delay(timer);

    // turn the pin off:

    digitalWrite(thisPin, LOW);
     break;   //break loop
  }

}

//Configure the green button sequence
int value2=digitalRead((button2));
if(value2==0){
for (int thisPin =1; thisPin < 5; thisPin++) {   // loop from the lowest pin to the highest

//turn the pin and buzzer on
  digitalWrite(thisPin, HIGH);
  delay(timer);
  
  if (thisPin==4) {
    tone(buzzer,1000);
    delay(1000);
    noTone(buzzer);
  }

  digitalWrite(thisPin, LOW);
}

for (int thisPin = 4; thisPin >=1; thisPin--){

digitalWrite(thisPin, HIGH);
  delay(timer);

    
    // turn the pin off:
    digitalWrite(thisPin, LOW);
}
}
  //configure the yellow button sequence
int value3=digitalRead((button3));
if(value3==0){                      //if yellow button is pressed
    //led light 1 & 2 on                        
    digitalWrite(ledPin1, HIGH);       
    digitalWrite(ledPin2, HIGH);      
    delay(timer);
    //led light 1 & 2 off
    digitalWrite(ledPin1, LOW);       
    digitalWrite(ledPin2, LOW);

    //led light 3 and buzzer on
    digitalWrite(ledPin3, HIGH);
    tone(buzzer,1000);
    delay(1000);
    //led light 3 and buzzer off
    noTone(buzzer);
    digitalWrite(ledPin3, LOW);

}



}