Objective
The purpose of this lab is to connect Op Amps to temperature sensor so that it can measure temperature from 15 °C to 35 °C with a resolution of 0.1 °C.
The purpose of this lab is to connect Op Amps to temperature sensor so that it can measure temperature from 15 °C to 35 °C with a resolution of 0.1 °C.
For each 1mV of input voltage, the amplified circuit should output 25mV.
Therefore, gain=25/1=25
We design the circuit as shown
(We use a difference op amp to subtract 150mV from the input voltage.)
To obtain 150 mV voltage, a voltage divider was used. According to calculation, the ratio of two resistance in the voltage divider was 19:1.
Voltage Divider
To obtain 150 mV voltage, a voltage divider was used. According to calculation, the ratio of two resistance in the voltage divider was 19:1.
Voltage Divider
150mV=(1/20)*3V (3V is the power supply)
Therefore, we need 19k and 1 k resistors connect in parallel.
The actual voltage we got was 157.6 mV
Difference op amp
Our circuit
When we input a voltage of 1V into the circuit, the output voltage was measured to be 5V.
With a difference op-amp circuit, this experiment was successfully completed. It achieved the goal that to allow the system to measure 15 °C to 35 °C.
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