11PC396 Finger Print Bike Helmet

8/2/2019 11PC396 Finger Print Bike Helmet

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title


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Introduction

Vehicle management system using Finger printsensor.

Also makes helmet wearing compulsory.

It also checks for fuel level; before making astart thereby preventing dry run in the middle.


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Block Diagram

PC

InterfacingPC

Voting Module

Microcontroller

Finger Print

Reader Relay Driver

LED

Indications

Fuel level sensor

Relay

Ignition Control

RF Decoder

RF Receiver


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Block Diagram

Helmet module

RF EncoderRF TransmitterPressure

Switches


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Microcontroller

PIC16F877A is the microcontroller used in theproject.

The controller has peripheral features like inbuiltADC, required to get the signals from the

sensors. Maximum clock frequency is 20MHz and hence

faster than 8051. Based on RISC and Harvard architecture and

hence even more faster. Embedded C is used for programming the

microcontroller.


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RF Transmitter and Receiver

In this project FSK modulated digital Rftransmitters are used.

The operating frequency of these modulesis 433MHz

These modules operate in the ISM band offrequencies and hence are license free.

These modules are used withaccompanying encoders and decoders.


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RF - Encoder and Decoder

These are used with the RF transmitterand receivers.

HT12E is the encoder IC

The decoder IC is HT12D

They encode and decode binary data into

a form that is used by the RF transmitterand receiver for communication.


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Level Sensing (Pressure)

MPX5010 is used for level sensing It is a linear pressure sensor. When a liquid

level varies, the pressure inside the tube alsovaries. This pressure is used for calculation ofthe level.

The output voltage is given by 0v to 5vdepending upon the pressure.

Integrated sensor in a simple 3pin package. It is fabricated using micro machined piezo

electric technology It is a integrated sensor and does not require

any signal conditioning The supply voltage input is 5V dc. The analog output from the pressure sensor is

directly connected to the ADC input.


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RS232 Interface

The serial/Comm port of the computer is usedfor communication with the hardware. The serial port of the computer uses RS232

standard for communication.

RS232 standard voltages are not compatiblewith conventional TTL / CMOS circuits. Hence IC MAX232 is used for voltage

conversion between RS232 port and themicrocontroller.

MAX232 enables full duplex communications,while doing the necessary voltage conversions.


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PC Application

A PC is used as the monitoring andcontrolling unit.

On the PC a visual basic program will be

used. VB is used because it offers an easy to

use and program graphical interface.

It is used to store all data and also tocontrol voting modules.


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Switching Circuit/Relay Drive

Relays are electromechanical switches that canbe controlled by ordinary digital pins.

But relays require more current than that can begiven by a microcontroller.

Hence a relay drive is required for currentamplification between the low current digitalcircuitry and the relays.

In this project a general purpose NPN transistor

is used for the relay drive. The transistor used is BC547, which is small

signal general purpose transistor.


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Fingerprint modules

FingKey is used as fingerprint scanner.

It is connected directly to the USB port ofthe computer.

Fingerprint SDK is the software used toget input of the fingerprint from thescanner to the PC.

It has 500 DPI(Dots per Inch) resolution.


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Hardware Components

PIC 16F877A microcontroller

Relay

Fuel sensor MAX232

Finger print reader


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Software Tools

MP Lab IDE for PIC programming

Orcad 16 for schematic design

Eagle layout Editor for PCB design VB for PC programming.


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Thank You

Documents

11PC396 Finger Print Bike Helmet