#include <Arduino.h>
#include <Bluetooth.h>

// Pin that the distance sensor's trig pin is connected to
const int trigPin = 7;

// Pin that the distance sensor's echo pin is connected to
const int echoPin = 8;

// The maximum distance that the distance sensor can measure (in centimeters)
const int maxDistance = 200;

// The minimum and maximum vibration values that the phone can produce (0-255)
const int minVibrationValue = 0;
const int maxVibrationValue = 255;

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

  // Initialize Bluetooth
  Bluetooth.begin("YourBluetoothDeviceName");

  // Set the pin modes for the distance sensor
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Send a pulse to the distance sensor's trig pin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the pulse width of the echo pulse
  int pulseWidth = pulseIn(echoPin, HIGH);

  // Calculate the distance based on the pulse width
  int distance = pulseWidth / 58;

  // Clamp the distance to the maximum distance that the sensor can measure
  distance = min(distance, maxDistance);

  // Calculate the vibration value based on the distance
  int vibrationValue = map(distance, 0, maxDistance, maxVibrationValue, minVibrationValue);

  // Send the vibration value to the phone
  Bluetooth.println(vibrationValue);
}