#include <Wire.h>

const int BUTTONS_SLAVE_ADDRESS = 0x08;
const int LEDS_SLAVE_ADDRESS = 0x09;

void setup() {
  Wire.begin(); // Join I2C bus as master
  Serial.begin(9600);
}

void loop() {
  // Request button states from buttons slave
  Wire.requestFrom(BUTTONS_SLAVE_ADDRESS, 1); // Request 1 byte from slave

  if (Wire.available()) {
    byte buttonStates = Wire.read(); // Read the button states
    Serial.print("Button states: ");
    Serial.println(buttonStates, BIN); // Print the button states in binary

    // Send button states to LED slave
    Wire.beginTransmission(LEDS_SLAVE_ADDRESS);
    Wire.write(buttonStates);
    Wire.endTransmission();
  }

  delay(500); // Wait for half a second before next request
}