Introduction 1.1       GENERAL This chapter deals with the objective and unique features of the project and the organisation of the report.   1.2   OBJECTIVE The objective of the project work is to build an aid for physically challenged people to enable them operate normal daily life gadgets easily and conveniently using a voice recognition…

The EEPROM (ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY) is a very useful memory which can be used for storing data. The data storing and retrieving from any EEPROM memory is very simple compared to other kind of memories. As the name suggest the memory is electrically programmable and hence the data will be sustained in the memory until it is electrically erased or reprogrammed.There are lots of EEPROM chips available most of them are easy to interface with a microcontroller. It would be even better if the microcontroller itself has a built-in EEPROM. The microcontroller used in this project is PIC18F4550 and it also has an inbuilt EEPROM memory other than the flash memory. The data can be easily stored into or retrieve using simple codes. The PIC18F4550 has 256 bytes of internal EEPROM memory.The internal EEPROM of microcontrollers are very useful to store important data regarding their operation. They are used to store data like previous status, last log in/out time, last data received before shutting down or power failure.