Test

test.ino

void setup() {
  
  Wire.begin( 2 );
  Wire.onRequest( requestEvent );
  Wire.onReceive( receiveEvent );
  
}

void requestEvent(){

  // Envia requisicoes dos botoes
  for (int i = 0; i < 4; i++){
    Wire.write( botoesEstado[i] );
  }

}

void receiveEvent( int howMany ) {
  
  // Recebe andar
  andar = Wire.read();
  
  // Recebe estado das portas
  for( int i = 0; i < 4; i++ ) {
    portasEstado[i] = Wire.read();
  }
  
}