Rt = Vo/(i*0.001);
T = 1/ (a + ln(Rt)*(b + c*(ln(Rt)**2)));
C = T – 273.15;

The first line calculates the Thermistor resistance. The next line converts from resistance to temperature in Kelvin and finally converts the temperature from Kelvin to Centigrade.

  1. Insert Numeric Constant from Functions->Numeric palette. Do the same for the remaining Numeric Constants

  2. To create the Analog Input constants, right click with Wiring tool from the ToolsPalette and select Create->Constant

  3. When the blank Analog Constant appear, use the Operating tool to select the appropriate input channel by clicking on it.

  4. Use the Wiring tool from the Tools Palette to wire the icons as shown in the above block diagram.

  5. Go back to the Front Panel

  6. Click the Run button to run the VI. Use the Operating tool to change the High and Low Threshold.

  • Observe the ambient temperature

  • Use your finger to touch the thermistor. The temperature should change to reflect the higher temperature of your body.

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