1. Temperature Variable Assembly LM 324N: Used to amplify voltage using negative feedback Resistor values R i =474 Ω R f =10 kΩ Gain ( ) = 22.09 With these resistor values, we got a gain of 22.09, which enabled us to get a good voltage swing (0-10 volts) from our LM35 temperature sensor. V out V in RfRiRfRi = 1+ V out V in Soldered cables with heat shrink LM35 temperature sensor LM 324N Instrumentation amplifier

2. Complete Assembly Amplified VoltageTemperature o C 0.030 0.11 0.32 0.643 0.724 1.025 1.366 1.638 2.3610 2.611 4.1218 5.0823 7.7635

3. Temperature v Amplified Voltage

4. Conclusions  Max. operating temperature from LM35 = 100  C  Min. operating temperature from LM35 = 0  C  Unsuitable for detecting negative temperatures  Amplified output voltage is linearly proportional to the temperature (  C)  Low power consumption  Good output voltage swing from amplifier for A/D conversion in the PLC