Proximity or distance sensors are used to react to the approach of objects without direct contact. Proximity sensors can be found in everyday life, for example in the form of light barriers in lifts or in smartphones, so that the touchscreen switches off as soon as the device approaches the ear. There are, for example, ultrasonic proximity sensors with which your device reacts to acoustic signals. In our online shop, we have a large selection of distance sensors from brand manufacturers such as Adafruit, Sparkfun, Seeed Studio and MaxBotix.