File list (Check if you may need any files):
IIC-PCF8591-arduino
...................\IIC_PCF8591.ino
...................\Wire
...................\....\examples
...................\....\........\digital_potentiometer
...................\....\........\.....................\digital_potentiometer.ino
...................\....\........\master_reader
...................\....\........\.............\master_reader.ino
...................\....\........\master_writer
...................\....\........\.............\master_writer.ino
...................\....\........\SFRRanger_reader
...................\....\........\................\SFRRanger_reader.ino
...................\....\........\slave_receiver
...................\....\........\..............\slave_receiver.ino
...................\....\........\slave_sender
...................\....\........\............\slave_sender.ino
...................\....\keywords.txt
...................\....\utility
...................\....\.......\twi.c
...................\....\.......\twi.h
...................\....\Wire.cpp
...................\....\Wire.h