Adafruit_PCF8591.h

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#ifndef ADAFRUIT_PCF8591_H
#define ADAFRUIT_PCF8591_H

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

#define PCF8591_DEFAULT_ADDR 0x48 
#define PCF8591_ENABLE_DAC 0x40   

class Adafruit_PCF8591 {
public:
  Adafruit_PCF8591(void);

  bool begin(uint8_t i2caddr = PCF8591_DEFAULT_ADDR, TwoWire *theWire = &Wire);
  void enableDAC(bool enable);
  uint8_t analogRead(uint8_t adcnum);
  void analogWrite(uint8_t output);

private:
  Adafruit_I2CDevice *i2c_dev = NULL; 
  uint8_t _dacval = 0;
  bool _dacenable = false;
  uint8_t _halfRead(uint8_t adcnum);
};

#endif