VCNL 4200 I2C Control Library
This library is for control of the Vishay "High Sensitivity Long Distance Proximity and Ambient Light Sensor With I²C Interface". Details can be found here: https://www.vishay.com/optical-sensors/list/product-84430/
A 5V compliant board that works with standard Arduino can be found here: https://oshpark.com/shared_projects/C7N990kt