Arduino has a small amount of data storage space, TheArduino UNO has 32k. It doesn't have enough space if you want to store a lot of data. Therefore, we need to add an EEPROM Data Storage Module to increase its storage space. The EEPROM Data Storage Module transmit data toArduino UNO using I2C Protocol. It used 24LC256 256K I2C CMOS Serial EEPROM provided by Microchip Techonogy Inc. 24LC256 is a 32K x 8(256Kbit) Serial Electrically Erasable Programmable Read - Only Memory. It can also be used with the Interface shield board by I2C on Board..