const int trigPin = 7;
const int echoPin = 6;
const int ledR = 9;
const int ledG = 10;
const int ledB = 11;
const int buzzer = 5;
 
 
void setup() {
    Serial.begin(9600);
    pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
    pinMode(ledR, OUTPUT);
    pinMode(ledB, OUTPUT);
    pinMode(ledG, OUTPUT);
    pinMode(buzzer, OUTPUT);
}
 
void loop() {
   long durationindigit, distanceincm;
   digitalWrite(trigPin,LOW);
   delayMicroseconds(2);
   digitalWrite(trigPin,HIGH);
   delayMicroseconds(2);
   digitalWrite(trigPin,LOW);
 
   durationindigit = pulseIn(echoPin, HIGH);
 
   distanceincm = (durationindigit * 0.034) / 2;

 
   if(distanceincm > 100){ // 101 - infinity
      analogWrite(ledR, 255);
      analogWrite(ledG, 255);
      analogWrite(ledB, 255);
      tone(buzzer, 1000);
      delay(1000);
      analogWrite(ledR, 0);
      analogWrite(ledG, 0);
      analogWrite(ledB, 0);
      noTone(buzzer);
      delay(1000);
   }
   else if(distanceincm <= 100 && distanceincm > 70){
      analogWrite(ledR, 0);
      analogWrite(ledG, 255);
      analogWrite(ledB, 0);
      tone(buzzer, 300);
   }
   else if(distanceincm <= 70 && distanceincm > 40){ 
      analogWrite(ledR, 0);
      analogWrite(ledG, 255);
      analogWrite(ledB, 255);
      tone(buzzer, 600);
   }
   else if(distanceincm >= 0 && distanceincm <= 10){
      analogWrite(ledR, 255);
      analogWrite(ledG, 255);
      analogWrite(ledB, 255);
      tone(buzzer, 1000);
      delay(1000);
      analogWrite(ledR, 0);
      analogWrite(ledG, 0);
      analogWrite(ledB, 0);
      noTone(buzzer);
      delay(1000);
   }
   else if(distanceincm <= 40 && distanceincm >= 11){ 
      analogWrite(ledR, 255);
      analogWrite(ledG, 255);
      analogWrite(ledB, 255);
      tone(buzzer, 900);
   }
 
}