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Tuesday, October 13, 2009

Fahrenheit Thermometer Circuit Using LM35

This is a design for thermometer. This is a ones simple circuit. If you have a digital voltmeter, or any voltmeter with milli volt resolution and high input impedance, then you can use this temperature-to-voltage adapter circuit to measure room temperature. This circuit is based on LM35 as temperature sensor. This is the figure of the circuit.

Note that the voltage output of this circuit is floating, not referenced to ground. You have to use separate supply if your voltmeter has single ended (referenced to ground) input. You can set your voltmeter to 200 mV range to give temperature reading directly in Fahrenheit degree. [Schematic source: National Semiconductor Application Notes]

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