Moreover, analog sensors such as potentiometers and force-sensing resistors are still widely used. With advances in micromachinery and easy-to-use microcontroller platforms, the uses of sensors have expanded beyond the more traditional fields of temperature, pressure or flow measurement, for example into MARG sensors. ![]() Sensors are used in everyday objects such as touch-sensitive elevator buttons (tactile sensor) and lamps which dim or brighten by touching the base, besides innumerable applications of which most people are never aware. But a mercury-in-glass thermometer is also a sensor it converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated glass tube. It detects events or changes in quantities and provides a corresponding output, generally as an electrical or optical signal for example, a thermocouple converts temperature to an output voltage. A sensor is a transducer whose purpose is to sense (that is, to detect) some characteristic of its environs.
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