Wednesday, August 25, 2010

Design and Implementation of computer Interfacing based Thermometer

The Project is classified into following four sections:
  1. Sensing section
  2. Measuring section
  3. Conditioning or amplification section
  4. Interfacing or data acquisition section.
  5. Display section.
Sensing and measuring section sense temperature and convert it into electrical quantity as voltage. Conditioning or amplification section amplifies the measuring section output, which is the input of data acquisition section. For conditioning we use non inverting amplifier. At data acquisition section we use analog to digital converter(ADC) for digital output and a multiplexer for converting ADC output from parallel to serial. The multiplexer output is sensed by a parallel port of personal computer by Matlab. Then the digital value is converted to decimal. From temperature versus voltage equation we get measured temperature.
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