const int ledPin1 = 23;
const int ledPin2 = 22;
const int ledPin3 = 21;
const int freq = 5000;
const int ledChannel1 = 0;
const int ledChannel2 = 1;
const int ledChannel3 = 2;
const int resolution = 8;

int sw1 = 17;
int sw2 = 16;
int sw3 = 4;
int sw1State;
int sw2State;
int sw3State;

void setup() {
  pinMode(sw1, INPUT);
  pinMode(sw2, INPUT);
  pinMode(sw3, INPUT);
  ledcSetup(ledChannel1, freq, resolution);
  ledcAttachPin(ledPin1, ledChannel1);
  ledcSetup(ledChannel2, freq, resolution);
  ledcAttachPin(ledPin2, ledChannel2);
  ledcSetup(ledChannel3, freq, resolution);
  ledcAttachPin(ledPin3, ledChannel3);
}

void loop() {
  main:
  sw1State = digitalRead(sw1);
  if(sw1State == 0){
    goto LTR;
  }
  sw2State = digitalRead(sw2);
  if(sw2State == 0){
    goto RTL;
  }
  goto main;

  LTR:
  sw3State = digitalRead(sw3);
  if(sw3State == 0){
    ledcWrite(ledChannel1,0);
    ledcWrite(ledChannel2,0);
    ledcWrite(ledChannel3,0);
    goto main;
  }
  //GREEN LED
  for(int dutyCycle1 = 0; dutyCycle1 <= 255; dutyCycle1++){  
    ledcWrite(ledChannel1, dutyCycle1);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    delay(15);
  }
  for(int dutyCycle1 = 255; dutyCycle1 >= 0; dutyCycle1--){
    ledcWrite(ledChannel1, dutyCycle1);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    delay(15);
  }
  //YELLOW LED
  for(int dutyCycle2 = 0; dutyCycle2 <= 255; dutyCycle2++){  
    ledcWrite(ledChannel2, dutyCycle2);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    delay(15);
  }

  for(int dutyCycle2 = 255; dutyCycle2 >= 0; dutyCycle2--){
    ledcWrite(ledChannel2, dutyCycle2);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    delay(15);
  }
  //RED LED
  for(int dutyCycle3 = 0; dutyCycle3 <= 255; dutyCycle3++){  
    ledcWrite(ledChannel3, dutyCycle3);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    delay(15);
  }

  for(int dutyCycle3 = 255; dutyCycle3 >= 0; dutyCycle3--){
    ledcWrite(ledChannel3, dutyCycle3);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    delay(15);
  }
  goto LTR;

  RTL:
  //RED LED
  for(int dutyCycle3 = 0; dutyCycle3 <= 255; dutyCycle3++){  
    ledcWrite(ledChannel3, dutyCycle3);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    delay(15);
  }

  for(int dutyCycle3 = 255; dutyCycle3 >= 0; dutyCycle3--){
    ledcWrite(ledChannel3, dutyCycle3);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    delay(15);
  }
  //YELLOW LED
  for(int dutyCycle2 = 0; dutyCycle2 <= 255; dutyCycle2++){  
    ledcWrite(ledChannel2, dutyCycle2);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    delay(15);
  }

  for(int dutyCycle2 = 255; dutyCycle2 >= 0; dutyCycle2--){
    ledcWrite(ledChannel2, dutyCycle2);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    delay(15);
  }
  //GREEN LED
  for(int dutyCycle1 = 0; dutyCycle1 <= 255; dutyCycle1++){  
    ledcWrite(ledChannel1, dutyCycle1);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    delay(15);
  }

  for(int dutyCycle1 = 255; dutyCycle1 >= 0; dutyCycle1--){
    ledcWrite(ledChannel1, dutyCycle1);
    sw3State = digitalRead(sw3);
    if(sw3State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto main;
    }
    sw1State = digitalRead(sw1);
    if(sw1State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto LTR;
    }
    sw2State = digitalRead(sw2);
    if(sw2State == 0){
      ledcWrite(ledChannel1,0);
      ledcWrite(ledChannel2,0);
      ledcWrite(ledChannel3,0);
      goto RTL;
    }
    delay(15);
  }
  goto RTL;
}