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Presentation Of Mini Project
on
Digital Thermometer
Buddha Institute of Technology, GIDA, Gorakhpur
(Department of Electronics & Communication Engineering)
Project Guide:
1)Mr. Vivek Singh2)Ms. Neha Jaiswal
Coordinator:
1) Mr. Sushant Pandey
2) Ms. Shrishti Tripathi
Group Member:1)Mubashshirul Islam
2)Gaurav
3)Jitendra Kumar Pandey
4)Adeep Kumar Yadav
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Table of Contents:
Introduction
Component
Circuit Diagram
Working
Application
Conclusion
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Introduction:-
This project works as a digital thermometer
Thermometer displays the ambient temperature through a
LCD display.
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 suitablenumber in Celsius scale which is done by the ADC0804.
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The LM 35 IC generates a 10mV variation to its output voltage
for every degree Celsius change in temperature.
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Components:
Temperature sensor LM 35
ADC 0804
Microcontroller 8051 (AT89C51)
LCD
Resistor(10K-4)
Capacitor(150pF-1,10F)
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LM 35:
LM35is a temperature sensor with its output proportional to
the temperature (in oC).
The operating temperature range is from -55C to 150C.
The output voltage varies by 10mV in response to every oC
rise/fall in ambient temperature.
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ADC 0804:
8-bit analog to digital
convertor
The digital outputs vary
from 0 to a maximum of
255.
The time taken to convert
the analog value to digital
value is dependent on thisclock source.
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MC AT89C51:
AT89C51 is an 8-bit
microcontroller and belongs
to Atmel's 8051 family.
has 4KB of Flashprogrammable and erasable
read only memory and 128
bytes of RAM.
there are four portsdesignated as P1, P2, P3and
P0.
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LCD:A 16x2 LCDmeans it can display 16 characters per line and there
are 2 such lines.
This LCD has two registers, namely, Command and Data.
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Circuit Diagram:
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Working:
the temperature sensor LM 35 sense temperature and produce
the output like as 20,30,40C. For each C it produce 10 mV
output .
The output of LM 35 goes to the ADC 0804 and this
converted voltage output into 8 bit data inside the chip.
Inside the MC 89C51 the hole process is going on with the
help of program.
The data pin of LCD is connected to the MC 89C51
&according to MC the measured temperature is display on
LCD .
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Application:
Digital thermometer are often used in clinic setting on
patients
Thermometer are used to give air , atmosphere and water
temperature readings.
laboratory use includes monitoring experiments and chemical
reactions as well as maintaining an optimal laboratory
environment.
Thermometers used for health care ,cooking and monitoring
temperature on home appliances such as the refrigerator or
swimming pool.
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Conclusion:
Hereby we come to an end of our project Digital
thermometer.
This project gives an idea about working of a sensor LM 35,
ADC0804 and MC 89C51.
This project can be used anywhere either at home or industries.
This is also cost efficient.
Measurement accuracy is better.
It is easy to use.
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THANK YOU
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