A sensor is a machine, module, subsystem, or device that detects changes and events in the environment. The information about these changes is then sent to various other electronics, most of which include a computer processor. A sensor is always used in conjunction with an electronic device.
Sensor are used in a variety of everyday objects, such as touch-sensitive lamps that dim and light up by touching the base and touch-sensitive elevator buttons. Micromachinery and user-friendly microcontroller platforms have advanced over time.
Sensor applications have expanded beyond pressure and flow measurement and traditional temperature fields over time. Analog sensors, such as force-sensing resistors and potentiometers, are still widely used today.