Adafruit_PCF8574.h

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#ifndef _ADAFRUIT_PCF8574_H
#define _ADAFRUIT_PCF8574_H

#include "Arduino.h"
#include <Adafruit_BusIO_Register.h>
#include <Adafruit_I2CDevice.h>

#define PCF8574_I2CADDR_DEFAULT 0x20 


class Adafruit_PCF8574 {
public:
  Adafruit_PCF8574();
  bool begin(uint8_t i2c_addr = PCF8574_I2CADDR_DEFAULT, TwoWire *wire = &Wire);

  bool digitalWriteByte(uint8_t d);
  bool digitalWrite(uint8_t pinnum, bool val);
  uint8_t digitalReadByte(void);
  bool digitalRead(uint8_t pinnum);
  bool pinMode(uint8_t pinnum, uint8_t val);

private:
  uint8_t _readbuf = 0, _writebuf = 0;

  Adafruit_I2CDevice *i2c_dev;
};

#endif