#include <WiFi.h>
#include <Ultrasonic.h>

// Define pins for ultrasonic sensor and buzzer
const int trigPin = 17;
const int echoPin = 16;
const int buzzerPin = 4;

// Create an instance of the Ultrasonic class
Ultrasonic ultrasonic(trigPin, echoPin);

void setup() {
  Serial.begin(115200);
    pinMode(buzzerPin, OUTPUT);
    }

    void loop() {
      int distance = ultrasonic.read();
        Serial.print("Distance: ");
          Serial.print(distance);
            Serial.println(" cm");

              if (distance < 40) { // adjust this value to your desired detection range
                  tone(buzzerPin, 1000, 500); // produce a 1 kHz tone for 500 ms
                    }

                      delay(50); // adjust this value to your desired scan rate
                      }