Celsius scale 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 suitable number in Celsius scale which is done by
the ADC0804.
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.
The step size is defined by the voltage applied at the
Vref/2 pin of the ADC IC. For example, if the voltage at Vref/2 pin is set to
1.28V then ADC has a step size of 10 mV. So if the input voltage is 1V the
equivalent binary output of ADC will be 100 or 0110 0100 in binary. The 8 bit
binary output of the ADC is incremented by one for every 10 mV rise of input
voltage. Different step size can be selected by changing the voltage input to
the Vref/2 pin. The step size of the ADC is calibrated using a preset to match
the actual temperature. Once the ADC is calibrated it will give the correct
output further. The binary output of ADC is fed parallel to a port of the
microcontroller .The microcontroller reads the input through ADC and displays
the corresponding decimal value on LCD.
If you want to C Code and more details about this circuit write your email id in comment box.we will send you details.
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