I've created in NI Multisim 11 project PT1000 and OP Amp TLC271CP for measuring temperature from-20C to +200 C. It should formula for calculation Vout and to check whether this model can work in reality. I am not electrician but my Hobby's electronics. Intervals Vout (ADC) is 0-5 V. Microcontroller was ATMega 16, but that does not meet, if resolution ADC ATMega 16 is not good I think to use SPI MCP3201 12-bit ADC. Further should formula for calculation RT (R7) on bases Vout.
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