VCNL4040 Evaluation Board Adafruit VCNL4040 Evaluation Board is designed to evaluate the features and functionality of the VCNL4040 proximity and lux sensor. The VCNL4040 sensor is a 2-in-1 device featuring a proximity sensor that works from 0mm to 200mm and a light sensor ranging from 0.0125lux to 6553lux. The VCNL4040 is placed on a breakout board with support circuitry that allows the board to be used with 5V (Arduino/ Metro328) or 3.3V (Feather/Raspberry Pi) logic levels. This proximity/lux sensor uses an I2C interface to seamlessly connect it up with two wires (plus power and ground). The sensor includes the SparkFun Qwiic compatible STEMMA QT connectors for the I2C bus.