#include <BluetoothSerial.h>

#define CONFIG_BT_ENABLED
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error "Bluetooth was not enabled! Please, enable it!"
#endif

BluetoothSerial SerialBT;

const char triggerPin = 2; // Pin for sending a signal to the HC-SR04 sensor
const char echoPin = 4; // Pin for receiving the response from the HC-SR04

void setup() {
  Serial.begin(115200);

  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);

  SerialBT.begin("ESP32");
}

void loop() {
  unsigned short int duration, distance;

  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);

  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);

  digitalWrite(triggerPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1; // Calculate distance in centimeters
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(1000); // Delay before the next distance measurement
}