TestaPCF

  #include <Wire.h>

  void setup()
  {
    Wire.begin();
  }
  void loop()
  {
                                                    //Se PCF8574A mude 32 para 56
    Wire.beginTransmission(56);                     //Begin the transmission to PCF8574
    Wire.write(1);                                  //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.write(2);                                  //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.write(4);                                  //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.write(8);                                  //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.write(16);                                 //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.write(32);                                 //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.write(64);                                 //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.write(128);                                //Send the data to PCF8574
    Wire.write(0);                                  //Send the data to PCF8574
    Wire.endTransmission();                         //End the Transmission
  }