A digital thermometer is an instrument used to automatically
measure the temperature of a substance or the surroundings. In this
project a multiscale digital thermometer was designed. In our
design there was three main parts 1. Sensor 2. Microcontroller 3.
LCD display parts. A DC voltage was developed at the output of the
sensor (LM35) depending on the temperature of the body to be
measured. For an increase of every 1 degree centigrade of
temperature an increase of 10mv voltage at the sensor output was
found. We could measure the magnitude of temperature ranging from 0
to 102 degree centigrade with this thermometer and the
corresponding sensor voltage output was found to be in the range of
0-1 volt. The sensor output was connected to the microcontroller
input. The measured value of the temperature was displayed through
an LCD display in the unit of Fahrenheit, Centigrade and Kelvin.
The whole set up was mounted on a breadboard and every section of
the circuit was tested individually. After getting satisfactory
result every section was jointed. The response time of the
thermometer was found to be of maximum 15 seconds. The total cost
of the project was BDT-800/- only.
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