/*
  Arduino | general
  Verthru — 10/23/24 at 11:30 PM
  my arduino sensor is not sensoring
*/

const int BUZZ_PIN = 11;
const int ECHO_PIN = 8;
const int TRIG_PIN = 9;

int oldDistance = 0;

void setup() {
  Serial.begin(9600);
  pinMode (ECHO_PIN, INPUT);
  pinMode (TRIG_PIN, OUTPUT);
  pinMode (BUZZ_PIN, OUTPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(5);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = ((duration / 2) / 29.1) + 0.5;

  if (distance != oldDistance)  {
    oldDistance = distance;
    /*
      if (distance <= 100) {
        soundValue =  250;
      }
      if (distance < 90) {
        soundValue =  350;
      }
      if (distance < 80) {
        soundValue =  450;
      }
      if (distance < 70) {
        soundValue =  550;
      }
      if (distance < 60) {
        soundValue =  650;
      }
      if (distance < 50) {
        soundValue =  750;
      }
      if (distance < 40) {
        soundValue =  850;
      }
      if (distance < 30) {
        soundValue =  950;
      }
      if (distance < 20) {
        soundValue = 1050;
      }
      if (distance < 10) {
        soundValue =  1150;
      }
      if (distance < 5) {
        soundValue =  1250;
      }
    */

    if (distance > 100 || distance <= 0) {
      Serial.println("Out of range");
      noTone (BUZZ_PIN);
    } else {
      // shantaram — Today at 12:01 AM
      int soundValue = 250 + 100 * round(10 - distance / 10);
      Serial.print("Range: ");
      Serial.print(distance);
      Serial.println(" cm");
      tone(BUZZ_PIN, soundValue);
    }
  }
  delay(500);
}