how to interface PT100 temp sensor with 89s52

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malasi

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hi all,

i am trying interface pt100 temperature sensor with AT89S52 without any analog IC, i want to measure temperature from 0 to 300 degree centigrate how it is possible please help me if possible please send schematic diagram of the same.
 

i am trying interface pt100 temperature sensor with AT89S52 without any analog IC
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First, PT100 sensor requires signal conditioning module that converts resistance (PT100 => 100ohm @ 0degC) to usable voltage, say, 0 - to - 3V range ..
Then the voltage can be converted to a digital format (ADC) - something that 8051 can digest ..
It's not difficult, but it has to be done in the proper way ..

Rgds,
IanP
:|
 

    M

    malasi

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If you can afford to loose ADC resolution, a voltage divider formed by the Pt1000 and a precise reference resistor, connected to
an ADC, that uses the same voltage as refernce (ratiometric measurement) is the most simple design. A 16-Bit ADC with I2C interface
as TI ADS1100 is perfectly suited for this purpose.

You need some simple arithmetic to calculate the Pt1000 resistance from input voltage and additional calculations to take the
non-linear sensor characteristic into account.
 

    M

    malasi

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