The document provides an overview of a microcontroller-based digital speedometer-odometer for bikes, detailing its components including an AT89C2051 microcontroller, LCD display, and EEPROM. It emphasizes the device's advantages over mechanical speedometers, such as reliability and ease of installation. The conclusion affirms the project's technical viability and financial feasibility for speed measurement applications.

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Contents
• Introduction
• Circuit Diagram
• Circuit Description
• PCB Layout
• Features
• Application
• Conclusion
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IntroductionIntroduction
10-Apr-2015
•It is an digital speedometer-odometer which can be installed with a
bike.
•Digital speedometers are found only in luxury cars and high-end
motor bikes.
•The circuit uses an AT89C2051 Microcontroller, a 16x2 LCD display,
4N35 optocoupler, 24C02 EEPROM.
•It is better alternative to the mechanical speedometer & even
beginner with min. skill level.
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Circuit Diagram
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Circuit DescriptionCircuit Description
•Microcontroller :- A 20-pin AT89C2051 microcontroller from
ATMEL is used with CISE-Based 8051 family.
•LCD Module :- It is used to display the speed & distance traveled, here
used a 16x2 alphanumeric LCD based on HD44780 controller.
•Serial EEPROM :- Electrical Erasable Programmable Read Only
Memory.
•I2
C Bus Protocol :- It is MultiMate bus, it uses serial data line (SDA) &
serial clock line (SCL).
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•Speed Sensor :- It sends a pulse to the microcontroller each time a
revolution is made.
•Optocoupler :- It is used to count the effect of bouncing.
•Power Supply :- The power supply for the circuit is drawn from the
vehicles is 12 volts.
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•Digital read out.
•Speed Displayed in km/hr.
•Distance travelled displayed in km.
•Readings saved in non-volatile memory.
•Reliability due to use of the microcontroller.
•No mechanical wear & tear.
•Home-brewed speed transducer or sensor.
•Self reset to zero after completion of 99999.9km.
•Easy to built & fix on the bike.
FeaturesFeatures
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•It is used in luxury cars & motor bike.
•It is used to measured speed of the motor bike.
•It measures speed & quantity of fuel.
•It is used to counting revolution and speed calculation of cars.
•It is used for conversion of speed & display the result.
ApplicationApplication
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Considering the total requirement and need of society as well as
according to cost analysis and project profitability statement it is
concluded that the project microcontroller based speedometer-
Cum-Odometer is technically viable, financially feasible and
suitable for speed measurement.
ConclusionConclusion
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