Two sensors are included, one is sensitive to infrared. An algorithm is used to calculate the light levels in lux, by combining the readings from both sensor types. The total measurable dynamic range is 1 : 1,000,000.
An I2C bus running at 3.3V is used for I/O, with all the power and signal lines brought out to to both sides of the board to allow daisy-chaining with other I2C-conformant boards.
For additional details, see jeelabs.org/2010/03/21/lux-plug/.
Bill of Materials
This project is © Jean-Claude Wippler, and is published under the terms of the Creative Commons Attribution-ShareAlike 3.0 Unported licence.