sensor is a device, module, or subsystem whose purpose is to detect events or changes in its environment and send the information to other electronics, frequently a computer processor. A sensor is always used with other electronics, whether as simple as a light or as complex as a computer.

A sensor is a device used to measure a property, such as pressure, position, temperature, or acceleration, and respond with feedback. For example: A security alarm system may have an infrared sensor which sends a signal when the beam is broken.

Sensor modules have extra electronic circuitry along with sensor that helps interface them with microcontrollers.


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