In the broadest definition, a sensor is an object whose purpose is to detect events or changes in its environment and then provide a corresponding output. 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.
Advances in micro machinery and easy-to-use microcontroller platforms have expanded the uses of sensors beyond the most traditional fields of temperature, pressure or flow measurement, for example into MARG sensors. Moreover, analog sensors such as potentiometers and force-sensing resistors are still widely used. Applications include manufacturing and machinery, aeroplanes and aerospace, cars, medicine, and robotics as well as in our day-to-day life.