#include <Arduino.h>
#include <Wire.h>

#define SDA_PIN 21
#define SCL_PIN 22

#define SLAVE_ADDRESS 0x0B

void requestEvent();

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

  Wire.begin(SDA_PIN, SCL_PIN, SLAVE_ADDRESS); // Initialize I2C with specified SDA and SCL pins

  Wire.onRequest(requestEvent);
}

void loop()
{
}

void requestEvent()
{
  // TODO: Send data to the master when requested
  Serial.println("Master requested data from Slave.");
  Wire.write("Hello from Slave!");
}