Buzzer.ino

#define trigPin 7
#define echoPin 6
#define led 13
#define led2 12
#define led3 11
#define led4 10
#define led5 9
#define led6 8
#define buzzer 3
int sound = 250;
void setup() {
 Serial.begin (9600);
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
 pinMode(led, OUTPUT);
 pinMode(led2, OUTPUT);
 pinMode(led3, OUTPUT);
 pinMode(led4, OUTPUT);
 pinMode(led5, OUTPUT);
 pinMode(led6, OUTPUT);
 pinMode(buzzer, 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<=90 && distance>30){
    digitalWrite(led,HIGH);
    sound = 50;
  }
 if (distance <= 30) {
 digitalWrite(led, HIGH);
 sound = 250;
}
 else {
 digitalWrite(led,LOW);
 }
 if (distance < 25) {
 digitalWrite(led2, HIGH);
 sound = 260;
}
 else {
 digitalWrite(led2, LOW);
 }
 if (distance < 20) {
 digitalWrite(led3, HIGH);
 sound = 270;
} 
 else {
 digitalWrite(led3, LOW);
 }
 if (distance < 15) {
 digitalWrite(led4, HIGH);
 sound = 280;
}
 else {
digitalWrite(led4,LOW);
 }
 if (distance < 10) {
 digitalWrite(led5, HIGH);
 sound = 290;
}
 else {
 digitalWrite(led5,LOW);
 }
 if (distance < 5) {
 digitalWrite(led6, HIGH);
 sound = 300;
}
 else {
 digitalWrite(led6,LOW);
 }
  
 if (distance > 90 ){
 Serial.println("Out of range");
 noTone(buzzer);
 }
 else {
 Serial.print(distance);
 Serial.println(" cm");
 tone(buzzer, sound);
 }
 
 delay(500);
}