Proximity 3 click Mikroe Proximity 3 click features the Vishay VCNL4200 high sensitivity long distance proximity sensor, ambient light sensor and a 940nm IRED, all housed in one package. This intelligent proximity and light sensing device features smart sensing and light conditioning properties. The Proximity 3 click can be used in a wide range of applications. Some applications include adjusting TFT screen brightness depending on ambient light, turning off the TFT background light if it is covered, very accurate lux meters, reliable security sensors and so on.