#define trig 4
#define echo 42
#define red 35
#define green 39
#define blue 38
#define yellow 37
#define purple 36
#define bexx 45
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(purple, OUTPUT);
  pinMode(bexx, OUTPUT);
}

void loop() {
  int duration = 0;
  int cm = 0;
  digitalWrite(trig, 1);
  delayMicroseconds(10);
  digitalWrite(trig, 0);
  duration = pulseIn(echo, 1);
  cm = duration/58;
  Serial.println(cm);
  
  if(cm<300){
    digitalWrite(red, 1);
    tone(bexx, 10);
    delay(1);
    tone(bexx, 10);
    delay(1);
    tone(bexx, 10);
    delay(1);
    tone(bexx, 10);
    delay(1);
  }
  if(cm<250){
    digitalWrite(green, 1);
    tone(bexx, 10);
    delay(5);
    tone(bexx, 10);
    delay(5);
  }
  if(cm<200){
    digitalWrite(blue, 1);
    tone(bexx, 10);
    delay(10);
  }
  if(cm<150){
    digitalWrite(yellow, 1);
    tone(bexx, 10);
    delay(15);
  }
  if(cm<100){
    digitalWrite(purple, 1);
    noTone(0);
  }

  if(cm>=100){
    digitalWrite(red, 0);
    noTone(0);
  }
  if(cm>=150){
    digitalWrite(green, 0);
    noTone(0);
  }
  if(cm>=200){
    digitalWrite(blue, 0);
    noTone(0);
  }
  if(cm>=250){
    digitalWrite(yellow, 0);
    noTone(0);
  }
  if(cm>=300){
    digitalWrite(purple, 0);
    noTone(0);
  }
}