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

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

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 .

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

BLOCK DIAGRAM

CIRCUIT DIAGRAM

ALGORITHM…….

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

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.

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

FIGURE AT89C2051 MICROCONTROLLER

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.

FIGURE EEPROM

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.

FIGURE 7805 VOLTAGE REGULATOR

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.

FIGURE 4N35 OPTOCOUPLER

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.

FIGURE REED SWITCH

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.

FIGURE 16×2 LCD DISPLAY

QUERY??

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