#define PIN_TRIG 3
#define PIN_ECHO 2
#define RED_PIN 8
#define GREEN_PIN 9
#define BLUE_PIN 10
#define Buzzer_Pin 11
void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(RED_PIN,OUTPUT);
  pinMode(GREEN_PIN,OUTPUT);
  pinMode(BLUE_PIN,OUTPUT);
  pinMode(Buzzer_Pin,OUTPUT);
}
void setColor(int r,int g,int b)
{
   analogWrite(RED_PIN,r);
   analogWrite(GREEN_PIN,g);
   analogWrite(BLUE_PIN,b);
   delay(1000);
}
void loop() {
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  int duration = pulseIn(PIN_ECHO, HIGH);
  float d= duration* 0.034/2;
  Serial.println("Distance in CM:"+String(d));
  if(d<200)
  {
    setColor(255,0,0);
    tone(Buzzer_Pin,50);
    delay(1000);
    setColor(0,0,0);    
    noTone(Buzzer_Pin);
  }
  if(d>200 && d<=300)
  {
    setColor(255,165,0);

  }
  if( d>300 && d<=400)
  {
    setColor(0,255,0);
  }
  
  delay(1000);
}