/*
 * created by Rui Santos, https://randomnerdtutorials.com
 * Ultrasonic Sensor with LED's bar graph and buzzer 
*/
int tonePin = 3;    //Tone - Red Jumper
int trigPin = 7;    //Trig - violet Jumper
int echoPin = 6;   //Echo - yellow Jumper
int proximity=0;
int duration;
int distance;
 
void setup() {
  //Serial Port
  Serial.begin (9600);
  
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(tonePin, OUTPUT);
}
 
void loop() {

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(1000);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  
  /*if (distance >= 45 || distance <= 0){
    Serial.println("Out of range");
  }
  else {
    Serial.print(distance);
    Serial.println(" cm");
  }*/
  
  proximity=map(distance, 0, 45, 8, 0);
  //Serial.println(proximity);
  
  if (proximity <= 0){
    proximity=0;
  }
  else if (proximity >= 3 && proximity <= 4){
    tone(tonePin, 200000, 200);
  }
  else if (proximity >= 5 && proximity <= 6){
     tone(tonePin,5000, 200);
  }
  else if (proximity >= 7 && proximity <= 8){
    tone(tonePin, 1000, 200);
  }
  
  delay(600);
  noTone(tonePin);
}