αισθητήραςm(Any hardware or software that can detect events or environmental changes, such as your current location or the amount of light around your computer. For example, a notebook with a location sensor, such as a Global Positioning System (GPS) receiver, can determine your exact location. An ambient light sensor can detect when there is a change in lighting, and then a program can use that information to adjust the brightness of your screen)
sensor The generic name for a device that senses either the absolute value or a change in a physical quantity such as temperature, pressure, flow rate, or pH, or the intensity of light, sound, or ratio waves and converts that change into a useful input signal for an information-gathering system['sensə]s
