CELL PHONE(MOBILE) BASED VOTING MACHINE ECE PROJECT WITH CIRCUIT DIAGRAM

CELL PHONE BASED  ELECTRONIC VOTING MACHINE

India is world’s largest democracy. Fundamental right to vote or simply voting in elections forms the basis of Indian democracy. In India all earlier elections a voter used to cast his vote by using ballot paper. This is a long, time-consuming process and very much prone to errors.

This situation continued till election scene was completely changed by electronic voting machine. No more ballot paper, ballot boxes, stamping, etc. all this condensed into a simple box called ballot unit of the electronic voting machine.

Cell phone based voting machine is capable of saving considerable printing stationery and transport of large volumes of electoral material. It is easy to transport, store, and maintain. It completely rules out the chance of invalid votes. It use results in reduction of polling time, resulting in fewer problems in electoral preparations, law and order, candidates' expenditure, etc. and easy and accurate counting without any mischief at the counting centre.

This cell phone based voting machine consists of microcontroller ATMEL AT89S51, a DTMF decoder CM8870C, a memory storage device EEPROM. DTMF is sent to the microcontroller which is decoded by CM8870C and the password is fed with the candidate number. The EEPROM is used to store the memory in case of power failure. This project is based on assembly language programming.

The aim of this project is to design & develop a mobile based voting machine. In this project user can dial the specific number from any land line or mobile phone to cast his vote. Once the user is connected to the voting machine he can enter his password & choice of vote. If he has entered a valid choice & password his vote will be caste with two short duration beeps. For invalid password/choice long beep will be generated. User is allotted 15 seconds to enter his password & choice. A reset button is provided for resetting the system. A total key is provided to display the result.

This  also use a non-volatile memory for storing all data. EEPROM will preserve all information in case of power failure.In this project all information is transmitted through DTMF tones. The major block & their functions are described in details below. 

                            

                                                   Block Diagram

 MICRO-CONTROLLER AT89S51

The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of in-system programmable Flash memory. The device is manufactured using Atmel‟s high-density non-volatile memory technology and is compatible with the industry- standard 80C51 instruction set and pin out. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional non-volatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S51 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.

The AT89S51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S51 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next external interrupt or hardware reset.

DTMF DECODER

In DTMF decoder circuit we use IC 8870. IC 8870 converts the dual tones to corresponding binary outputs. The CAMD CM8870/70C provides full DTMF receiver capability by integrating both the band-split filter and digital decoder functions into a single 18-pin DIP, SOIC, or 20-pin PLCC package. The CM8870/70C is manufactured using state-of-the-art CMOS process technology for low power consumption (35mW, MAX) and precise data handling. The filter section uses a switched capacitor technique for both high and low group filters and dial tone rejection. The CM8870/70C decoder uses digital counting techniques for the detection and decoding of all 16 DTMF tone pairs into a 4-bit code. This device contains input protection against damage due to high static voltages or electric fields; however, precautions should be taken to avoid application of voltages higher than the maximum rating.

DTMF SIGNALLING

AC register signaling is used in DTMF telephones, here tones rather than make/break pulse are used for dialing, each dialed digit is uniquely represented by a pair of sine waves tones. These tones (one from low group for row and another from high group for column) are sent to the exchange when a digit is dialed by pushing the key, these tone lies within the speech band of 300 to 3400 HZ, and are chosen so as to minimize the possibility of any valid frequency pair existing in normal speech simultaneously. Actually, this minimisator is made possible by forming pairs with one tone from the higher group and the other from the lower of frequencies. A valid DTMF signal is the sum of two tones, one from a lower group ( 697-940 Hz) and the other from a higher group ( 1209-1663 Hz). Each group contains four individual tones. This scheme allows 10 unique combinations. Ten of these code represent digits 1 through 9 and 0. . tones in DTMF dialing are so chose that none of the tones is harmonic of are other tone. Therefore is no change of distortion caused by harmonics. Each tone is sent as along as the key remains pressed. The DTMF signal contains only one component from each of the high and low group. This significantly simplifies decoding because the composite DTMF signal may be separated with band pass filters into single frequency components, each of which may be handled individually.

ATMEL 24C16

The AT24C01A/02/04/08/16 provides 1024/2048/4096/8192/16384 bits of serial electrically erasable and programmable read-only memory (EEPROM) organized as 128/256/512/1024/2048 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The AT24C01A/02/04/08/16 is available in space-saving 8-pin PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP packages and is accessed via a 2-wire serial interface.

LCD DISPLAY

This is the first interfacing example for the Parallel Port. We will start with something simple. This example doesn't use the Bi-directional feature found on newer ports, thus it should work with most, if not all Parallel Ports. These LCD Modules are very common these days, and are quite simple to work with, as all the logic required to run them is on board.

POWER SUPPLY

This section describes how to generate +5V   DC power supply

The power supply section is the important one. It should deliver constant output regulated power supply for successful working of the project. A 0-12V/1 mA transformer is used for this purpose. The primary of this transformer is connected in to main supply through on/off switch& fuse for protecting from overload and short circuit protection. The secondary is connected to the diodes to convert 12V AC to 12V DC voltage. And filtered by the capacitors, which is further regulated to +5v, by using IC 7805

 CIRCUIT DIAGRAM   

APPLICATIONS

1.      Fast track voting which could be used in small scale elections, like resident welfare association, “panchayat” level election and other society level elections.

2.      It could also be used to conduct opinion polls during annual share holders meeting.

3.      It could also be used to conduct general assembly elections where number of candidates are less than or equal to eight in the current situation.

4.      It is used in various TV serials as for public opinion.

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