Digital Speedometer

Digital Speedometer

P.L.Ganesh

Speedometer?

Analog Gauge

Digital Gauge

Setbacks of Analog counterpart

Susceptible to external Magnetic Fields which results in a error in the measurement.

Need additional devices to convert the output

Difficult to notice the value in low light conditions.

Aim of the Project

Detect the speed of rotation digitally.Convert the same into speed and display the same in the LCD.

Block Diagram

8051

MICROCONTROLLER

LCDDISPLAY

POWERSUPPLY

IRMODULE

Components used in the Project

1. AT89S52 Micro Controller2. IR Module3. LCD4. Power Supply

IR Module

IR represents Infra-Red light which is invincible to Human eyePrimarily consists Two Components

1. Transmitter [Infra-Red LED] 2. Receiver [Photo Detector]

IR LED

Photo Detector

Working of the IR Module

For every IR signal given by the LED a positive pulse is generated at the receiving

side by the Photo Detector as shown.

Micro Controller

AT89S52Low-Power, High Performance CMOS 8-bit MicrocontrollerBelongs to the Family of 8051

Internal Architecture

Pin Description

Pin Diagram of AT89S52

Oscillator Connections

External Clock Drive Configuration

Liquid Crystal Display

A general purpose alphanumeric LCD, with two lines of 16 characters

Interfacing LCD to 8051

Schematic of LCD and Interfacing with 8051

Regulated Power Supply Converts 230V AC supply to 5V DC

required for the Microcontroller

Components used for Regulation

1.Step Down Transformer2.Full Wave Rectifier3.Voltage Regulator[LM 7805]

Coding Coding for the Microcontroller is done in ‘Embedded C’ Dumping of code is done by using the software “Keil µVision”

Working

Speed = Number of pulses Time x No of holes

8051

MICRO CONTROLLER

POWER SUPPLY

WHEEL

IR LED

LCD DISPLAY

Applications

Determining the speed of the vehicles like bikes, car etc by attaching the device to the rotating spindles of wheels.

Finding the speed of the motors and similar rotating machines

in Industries.

With minor changes can also be used as a counter in the areas

like toll booths where number of vehicles passed through it per

hour can be calculated.

Future Scope By adding a speaker the customer can be warned of high

speeding by making different sounds for different speeds.

By using high capability IR sensors the maximum speed it

will handle can also be increased.

The speed at specific instants can be noted.

Queries?