The electronic voting machine is a very great invention. Instead of counting the votes marked on paper, the electronic voting machine can give result in just one second.

In this project switches are used to cast the vote. These switches belong to the candidates. Three other switches along with the candidates’ switches are employed. One switch is for voting controller person. A person cannot cast his/her vote unless this switch is pressed by the voting controller. Second switch is for checking the total number of votes that have been casted during the voting or after the voting. Third switch is for checking the result. Every time a person cast his/her vote, it will be stored in the memory (EEPROM).

A 4x3 keypad is interfaced with microcontroller for security purpose. Whenever the EVM is power up, it will ask for the password. However, the votes remain secured in EEPROM.

A 20x4 LCD is interfaced with microcontroller. LCD is used to display messages and data at various stages of voting. This EVM can be built either by 8051 microcontroller or AVR. Difference is that if you are using 8051 then you have to interface EEPROM externally while in AVR you get EEPROM on-chip.