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Engineering LibreTexts

2: Resistive Sensors

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  • Objective

    The objective of this exercise is to investigate devices that can be used to sense environmental factors such as light and temperature. These are important if circuitry is to react to surrounding conditions, for example, controlling fan speed that is proportional to temperature or turning lights on or off depending on existing light levels. Two such devices are the light dependent resistor or LDR, and the thermistor or temperature dependent resistor. They can be thought of as resistors whose values depend on either the surrounding light levels or the temperature.

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