BH1750FVI Digital Light sensor module for an optical intensity sensor IC digital two-wire serial bus interface. Use of the light intensity data collection module can adjust the LCD brightness of the keyboard backlight. Resolution module can detect a wide range of light intensity. 1, the outer diameter of 26mm, the large diameter edge 28.5mm, high 26MM (plus light beads) 2, the working voltage: DC5V 2, the parameters 3, Communication Interface: I2C. 4, the input light range: 1-65535lx. 5, sensitivity characteristics: Sensitivity Wavelength Typ: 560nm 6, the light source dependence is weak: incandescent, fluorescent, halogen, white LED, fluorescent and can be color: White Material: metal + plastic 1) I 2 C bus Interface ( f / s Mode Support ) 2) responsibility is approximately human eye response 3) Illuminance to Digital Converter 4) Wide range and High resolution. ( 1 - 65535 lx ) 5) Low Current by power down function 6) 50Hz / 60Hz Light noise reject-function 7) 1.8V Logic input interface 8) No need any external parts 9) Light source dependency is little. ( ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light ) 10) It is possible to select 2 type of I 2 C slave-address. 11) Adjustable measurement result for influence of optical window ( It is possible to detect min. 0.11 lx, max. 100000 lx by using this function. ) 12) Small measurement variation (+/- 20%) 13) The influence of infrared is very small. Package Contents: 4 x BH1750FVI Chip Light Intensity Light Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.