#define LED 4
#define BUZZER 2
#define IR_SENSOR 14


void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(IR_SENSOR, INPUT);
}


void loop() {
  int distance = analogRead(IR_SENSOR);
  distance = map(distance, 4063, 2045, 0, 100);
  
  if(distance <= 100){
    digitalWrite(LED, HIGH);
    tone(BUZZER, 262, 250); // Plays 262Hz tone for 0.250 seconds
    Serial.print("the obstacle is detected at distance: ");
    Serial.println(distance);
  }
  else{
    digitalWrite(LED, LOW);
    Serial.println("no obstacles detected! (no obstacles within range 100)");
  }

  delay(1000);
}