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The EEPROM stands for Electrically Erasable Programmable Read Only Memory. In an EEPROM the data can be written with the help of electrically programming the chip. Once programmed the data it will remain in the memory for a very long time even if there is no power applied to it. Hence the EEPROM memory is widely used in microcontroller systems where some particular data need to be retained each time the system is turned on.The EEPROM memory chips can be interfaced in a microcontroller chip usually with the help of serial communication protocols. Their applications can be found in sensor based system where the sensor data can be stored, display systems where the image data can be stored and in electronic voting machines where the count of the votes can be stored etc.In case of small applications where only a few bytes needs to be stored the extra EEPROM chips are not preferred since it add extra complexity in the hardware, coding and increase the cost of the system. Hence most of the microcontrollers are provided with small sized built-in EEPROM chip which can be used to store data in small applications.
The Arduino board has an AVR microcontroller in it which also has a built-in EEPROM memory. The memory size varies with the Arduino boards and the microcontroller used in them. Before writing the data to the EEPROM memory it is always recommended to check each and every memory locations of so that there won’t be any data error when the microcontroller tries to retain the data. This particular project explains how to perform a test on the built-in EEPROM of an Arduino microcontroller.
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