#include <Arduino.h>

// Define the pin numbers for the ultrasonic sensor and buzzer
#define TRIGGER_PIN 7
#define ECHO_PIN 6
#define BUZZER_PIN 4

// Define the threshold distance for sounding the buzzer
#define BUZZER_DISTANCE_THRESHOLD 50 // Adjust as needed

// Function to initialize buzzer
void initBuzzer() {
    pinMode(BUZZER_PIN, OUTPUT);
}

// Function to produce pulsing sound
void produceSound() {
    // Sound the buzzer
    tone(BUZZER_PIN, 1000); // 1000 Hz tone
    delay(100);             // Delay for 100 milliseconds
    noTone(BUZZER_PIN);     // Turn off the buzzer
}

void setup() {
    // Initialize serial communication
    Serial.begin(9600);

    // Initialize ultrasonic sensor pins
    pinMode(TRIGGER_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);

    // Initialize buzzer
    initBuzzer();
}

void loop() {
    // Trigger ultrasonic sensor to start measurement
    digitalWrite(TRIGGER_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIGGER_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIGGER_PIN, LOW);

    // Read the duration of the pulse from the echo pin
    long duration = pulseIn(ECHO_PIN, HIGH);

    // Convert the duration into distance (in centimeters)
    // Speed of sound in air = 343 meters per second = 0.0343 cm/microsecond
    float distance = duration * 0.0343 / 2;

    // Print distance for debugging
    Serial.print("Distance: ");
    Serial.print(distance);
    Serial.println(" cm");

    // Check if the distance is less than the threshold
    if (distance < BUZZER_DISTANCE_THRESHOLD) {
        // If so, sound the buzzer
        produceSound();
        Serial.println("Object too close! Beep beep.");
    }

    // Delay before next sensor reading
    delay(200); // Adjust as needed
}