DIGITAL SPEEDOMETER full report

[seminar class]

presented by:
P.L.Ganesh

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Digital Speedometer
Speedometer?
Analog 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
Components used in the Project
1. AT89S52 Micro Controller
2. IR Module
3. LCD
4. Power Supply
IR Module
 IR represents Infra-Red light which is invincible to Human eye
 Primarily 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
 AT89S52
 Low-Power, High Performance CMOS 8-bit Microcontroller
 Belongs to the Family of 8051
Internal Architecture
Pin Description
Oscillator Connections
Liquid Crystal Display
A general purpose alphanumeric LCD, with two lines of 16 characters
Interfacing LCD to 8051
Regulated Power Supply
 Converts 230V AC supply to 5V DC required for the Microcontroller
Components used for Regulation
1. Step Down Transformer
2. Full Wave Rectifier
3. 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
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.