Description in detail: The “ Electronic Voting Machine “ basically consists of four main blocks; these are keypad, micro controller, display and control switches
1) Keypad: Keypad is basically a 4 X 4 matrix keypad. Thus it has one key specified for one candidate. This block is used in both voting and counting mode, in voting mode key of respective candidate is pressed, the corresponding signal is sensed by micro controller. In counting mode this keypad is used to check the votes of respective candidate. The key given for candidate is pressed and micro controller senses the corresponding signal.
2) Micro controller: Micro controller senses the signal given from switches and decides the mode of operation in voting mode it increments the data for corresponding key i.e. respective candidate as well as it sends signal to display block to indicate one key is pressed. In counting mode micro controllers fetches data from memory location and send it to display devices.
3) LCD: Liquid Crystal Display which is commonly known as LCD is an Alphanumeric Display it means that it can display Alphabets, Numbers as well as special symbols thus LCD is a user friendly Display device which can be used for displaying various messages unlike seven segment display which can display only numbers and some of the alphabets. The only disadvantage of LCD over seven segment is that seven segment is robust display and be visualized from a longer distance as compared to LCD. Here I have used 16 x 2 Alphanumeric Display which means on this display I can display two lines with maximum of 16 characters in one line.
4) Control switches: There are three control switches:
I. Clear Votes. II. Controller switch. III. Total Votes

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