const int TRIG_PIN = A3;
const int ECHO_PIN = A4;
const int R =A5;
const int G = A2;
const int B = A1;

void setup()
{
   

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(R, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
}

void loop()
{
  float interval = 0;
  float duration = 0;
  float distance = 0;

     analogWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
     analogWrite(TRIG_PIN, LOW);
    duration = pulseIn(ECHO_PIN, HIGH);
    distance = (duration / 2) / 29;
if ((150 < distance) && (distance < 400 )){
    analogWrite(G, 255);
  analogWrite(B, 255);
     analogWrite(R, 0);
  }
  if ((50 < distance) && (distance< 150) ){
     analogWrite(B, 255);
    analogWrite(R, 0);
     analogWrite(G, 255);

  }
  if (distance < 50 ){
     analogWrite(R, 0);
  analogWrite(B, 255);
     analogWrite(G, 255);
  }
    
  
 
 
}