Wednesday, April 17, 2013

Thermometer sensor (Extra Credit)

The purpose of this lab is to amplify a thermosensor to a specific output range.

Prelab:
We start with the LM35 which produces 10 mV/°C.
We want to measure between 15 °C to 35 °C.
Using a difference amplifier, we shift and amplify the range of 150 mV - 350 mV to 0V - 5V.


To do so, we have V_2 = LM35, V_1 = 150 mV.
Our gain is 25, so R_f = 150 kΩ, and R_i = 6 kΩ.

Procedure: 
We start by building the circuit.

V_1 = Left pot, V_2 = Right pot
However to test the op amp, we made V_2 = 350 mV to see if the analysis was correct.


We then measure V_out = 5.05 V

Conclusion:
The lab was a success. We were able to use our opamp to amplify 350 mV correctly into 5V.

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