project

CELSIUS AND FAHRENHEIT SCALE DIGITAL THERMOMETER USING IC P89V51RD2

TABLE OF CONTENT

SR.NO
TOPIC
PAGE.NO
1)
ABSTRACT
4
2)
INTRODUCTION
5
3)
DESIGN
6
4)
COMPONENTS
7
5)
CIRCUIT DIAGRAM

10
6)
WORKING
10
7)
ADVANTAGES
11
8)
RESULT
11
9)
CONCLUSION
11
10)
BIBLIOGRAPHY
11

1. ABSTRACT

Fahrenheit scale digital thermometer is a temperature indicator which displays temperature in Fahrenheit scale. It consists of two sections. One is that which senses the temperature. This is a temperature sensor LM 35. The other section converts the temperature value into a suitable number in Celsius scale which is done by the ADC0804. The temperature sensed in Celsius scale is converted into the Fahrenheit scale temperature just by using the Celsius to Fahrenheit conversion formulae. This project also uses 8051 microcontroller (AT89C51).
Keywords— Celsius, Fahrenheit, ADC

2. INTRODUCTION

A digital thermometer can be easily made by interfacing a temperature sensor to the microcontroller AT89C51. The temperature sensor used in the project is LM35. The LM 35 IC generates a 10mV variation to its output voltage for every degree Celsius change in temperature. The Output of the temperature sensor is analog in nature so we need an analog to digital convertor for converting the analog input to its equivalent binary output. The ADC 0804 is the analog to digital convertor IC used in the project. 0804 is a single channel convertor which converts the analog input up to a range of 5V to an equivalent 8-bit binary output.

3. DESIGN

Fig 2.1-Block Diagram

The block diagram of the thermometer consists of a temperature sensor, adc and a microcontroller. The LM35 IC senses the temperature. The adc converts this analog input voltage from the sensor to required digital form which is then given to the microcontroller which in turn is

Bibliography: a) IEEE MAGAZINE b) ELECTRONICS FOR U