#define trigPin 13
#define echoPin 12
#define BPin 7
#define piezoPin 9
#define RPin 4
#define GPin 8

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(BPin, OUTPUT);
    pinMode(piezoPin, OUTPUT);
     pinMode(RPin, OUTPUT);
         pinMode(GPin, OUTPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  if (distance >= 200 || distance <= 0){
    Serial.println("Out of range");
    }


  else {
    Serial.print(distance);
    Serial.println(" cm");
  }
  delay(1000);
  {if (distance <= 25 || distance <= 0){
      digitalWrite(RPin, HIGH);
  }
    else{
         digitalWrite(RPin, LOW);

  }

  }
 {
    if (distance >= 25 && distance <= 50){
          digitalWrite(GPin, HIGH);
    }
    else {
       digitalWrite(GPin, LOW);
    }



   { if (distance >= 50 && distance <= 75){
          digitalWrite(GPin, HIGH);
    }
    else {
       digitalWrite(BPin, LOW);
   }
   {if (distance >= 75 && distance <= 100){
          digitalWrite(BPin, HIGH);
    }
    else {
       digitalWrite(GPin, LOW);
      {
       {if (distance >= 100 && distance <= 200){
          digitalWrite(piezoPin, HIGH);
    }
    else {
       digitalWrite(piezoPin, LOW);
    }
       }
      }
       }
    }
   }
 }
 }