#include <Wire.h>         // Include the Wire library for I2C communication

int potPin = D2;          // Define the analog pin connected to the potentiometer
int potVal;               // Variable to store the potentiometer value

void setup() {
  Serial.begin(9600);     // Initialize serial communication at 9600 baud rate
  Wire.begin(9);          // Initialize I2C communication as slave with address 9
  Wire.onRequest(sendData); // Define the function to be called when data is requested
}

void loop() {
  potVal = analogRead(potPin);  // Read the analog value from the potentiometer
  delay(500);                    // Adjust delay as needed
}

void sendData() {
  int servoVal = map(potVal, 0, 1023, 0, 180);  // Map potentiometer value to servo range (0-180)
  Serial.println(servoVal);                    // Print servo value to serial monitor
  Wire.write(servoVal);                        // Send servo value to the master device over I2C
}