#include <Wire.h>

// Pin definitions and constants
const int localLedPin = 2; // Pin for the local LED
const int ledOnCommand = 1; // Command to turn on LED on I2C devices

// I2C Slave Device Addresses
const int firstSlaveAddress = 0x04;
const int secondSlaveAddress = 0x05;

void setup() {
  pinMode(localLedPin, OUTPUT); // Set the LED pin as output
  Wire.begin();                 // Start the I2C bus as master
  Serial.begin(115200);         // Start serial communication at 115200 bps
}

void loop() {
  controlLocalLed(true);        // Turn on the local LED
  sendI2CCommand(firstSlaveAddress, ledOnCommand);  // Send command to the first slave
  sendI2CCommand(secondSlaveAddress, ledOnCommand); // Send command to the second slave
  controlLocalLed(false);       // Turn off the local LED
}

// Function to control the state of the local LED
void controlLocalLed(bool turnOn) {
  digitalWrite(localLedPin, turnOn ? HIGH : LOW);
  delay(1000); // 1 second delay
}

// Function to send a command to an I2C device
sendI2CCommand(int address, int command) {
  Wire.beginTransmission(address); // Start transmission to the specified address
  Wire.write(command);             // Send the command
  Wire.endTransmission();
  delay(1000); // 1 second delay
}