XIAO MG24 I2C support

Products & Technology XIAO
8

Master is ESP 32 S3 board (not Xiao), 4.7k pullup resistors.
Slave MG24 code:

#include <Wire.h>

#define I2C_ADDRESS 0x42

uint8_t buffer[12];  // Dummy 12-byte data

void onRequestHandler() {
  Wire.write(buffer, sizeof(buffer));
  Serial.println("buffer sent");
}

void setup() {
  Serial.begin(115200);
  delay(100);

  // Fill buffer with dummy data for testing
  for (int i = 0; i < sizeof(buffer); i++) {
    buffer[i] = i + 1;
  }

  Wire.begin(I2C_ADDRESS);  // Start as I2C slave
  Wire.onRequest(onRequestHandler);

  Serial.println("MG24 I2C Slave ready");
}

void loop() {
  delay(100);
}

Master Code:

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

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("Starting I2C scan on GPIO16 (SDA) and GPIO21 (SCL)");
  Wire.begin(16, 21);
}

void loop() {
  byte error, address;
  int nDevices = 0;

  Serial.println("Scanning...");

  for (address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0) {
      Serial.print("I2C device found at 0x");
      Serial.println(address, HEX);
      nDevices++;
    }
    delay(50); // Small delay to allow for I2C bus to stabilize
  }

  if (nDevices == 0) {
    Serial.println("No I2C devices found.");
  }

  delay(5000);
}

The result of scanning:
I2C device found at 0x1
I2C device found at 0x2
I2C device found at 0x3
… (all addresses)
I2C device found at 0x7D
I2C device found at 0x7E