1. MICROCONTROLLER BASED SPEEDOMETER CUM ODOMETER
PRESENTED BY:
TARIQUE TANWEER
UMESH KR. SINGH
VED PRAKASH PATEL

2. CONTENTS: INTRODUCTION FEATURES BLOCK DIAGRAM CIRCUIT DIAGRAM
COMPONENTS REQUIRED
AT89C2051
24C02C EEPROM
LM 7805
4N35 OPTOCOUPLER
REED SWITCH
16×2 LCD LISPLAY
MISCELLANEOUS

3. INTRODUCTION
The present invention relates to a Digital Speedometer for use with vehicles having internal electrical power supply. In particular, the invention relates to a digital speedometer for automotive vehicles such as auto mobiles, trucks and motor cycles. The Digital Speedometer designed is highly efficient, low cost .

4. FEATURES 1. Digital readout 2. Speed displayed in km/hour
3. Distance travelled displayed in kilometers
4. Readings saved in non-volatile memory (EEPROM)
5. Reliability due to use of the micro controller
6. No mechanical wear and tear

5. BLOCK DIAGRAM

6. CIRCUIT DIAGRAM

7. ALGORITHM…….

8. COMPONENTS AT89C2051 24C02C EEPROM LM 7805 VOLTAGE REGULATOR
4N35 OPTOCOUPLER
REED SWITCH
16×2 LCD LISPLAY

9. AT89C2051
The AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K bytes of Flash programmable and erasable read-only memory (PEROM). The device is manufactured using Atmel’s high-density non-volatile memory technology. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C2051 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control application.

10. FEATURES
2K Bytes of Reprogrammable Flash Memory – Endurance: 10,000 Write/Erase Cycles
2.7V to 6V Operating Range
Fully Static Operation: 0 Hz to 24 MHz
128 x 8-bit Internal RAM
15 Programmable I/O Lines
Two 16-bit Timer/Counters
Direct LED Drive Outputs
Low-power Idle and Power-down Modes

11. FIGURE
AT89C2051 MICROCONTROLLER

12. 24C02 EEPROM
The AT24C02 provides 2048 bits of serial electrically erasable and programmable read-only memory (EEPROM) organized as 256 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.

13. FIGURE
EEPROM

14. LM 7805 VOLTAGE REGULATOR
This series of fixed-voltage integrated-circuit voltage regulator is designed for a wide range of applications. These applications include on-card regulation for elimination of noise and distribution problems associated with single-point regulation. this regulators can deliver up to 1 A of output current. The internal current-limiting and thermal shutdown features of this regulator essentially make them immune to overload. In addition to use as fixed voltage regulators, this devices can be used with external components to obtain adjustable output voltages and currents, and also can be used as the power-pass element in precision regulator.

15. FIGURE
7805 VOLTAGE REGULATOR

16. 4N35 OPTOCOUPLER
The 4N35 is an optocoupler for general purpose applications. It contains a light emitting diode optically coupled to a phototransistor. It is packaged in a 6-pin DIP package.

17. FIGURE
4N35 OPTOCOUPLER

18. REED SWITCH
The reed switch is an electrical switch operated by an applied magnetic field. It was invented at Bell Telephone Laboratories in 1936 by W. B. Ellwood. It consists of a pair of contacts on ferrous metal reeds in a hermetically sealed glass envelope. The contacts may be normally open, closing when a magnetic field is present, or normally closed and opening when a magnetic field is applied.

19. FIGURE
REED SWITCH

20. 16×2 LCD DISPLAY
A liquid crystal display (LCD) is a flat panel display, electronic visual display that uses the light modulating properties of liquid crystals. Liquid crystals do not emit light directly.

21. FIGURE
16×2 LCD DISPLAY

22. QUERY??

23. THANK YOU