TSL2561 digital luminosity / lux / light sensor (Adafruit 439)

The TSL2561 luminosity sensor is an advanced digital light sensor, ideal for use in a wide range of light situations. Compared to low cost CdS cells, this sensor is more precise, allowing for exact lux calculations and can be configured for different gain/timing ranges to detect light ranges from up to 0.1 - 40,000+ Lux on the fly. The best part of this sensor is that it contains both infrared and full spectrum diodes! That means you can separately measure infrared, full-spectrum or human-visible light. Most sensors can only detect one or the other, which does not accurately represent what human eyes see (since we cannot perceive the IR light that is detected by most photo diodes) 

The sensor has a digital (i2c) interface. You can select one of three addresses so you can have up to three sensors on one board - each with a different i2c address. The built in ADC means you can use this with any microcontroller, even if it doesn't have analog inputs. The current draw is extremely low, so its great for low power data-logging systems. about 0.5mA when actively sensing, and less than 15 uA when in powerdown mode. 

Of course, we wouldn't leave you with a datasheet and a "good luck!" - we wrote a detailed tutorial showing how to wire up the sensor, use it with an Arduino and example code that gets readings and calculates lux

• Approximates Human eye Response
• Precisely Measures Illuminance in Diverse Lighting Conditions
• Temperature range: -30 to 80 *C
• Dynamic range (Lux): 0.1 to 40,000 Lux
• Voltage range: 2.7-3.6V
• Interface: I2C

Light Meter
Measure and display light levels.

TSL2561 Luminosity Sensor
Low power, digital luminosity (light) sensor

• Datasheet
• Arduino library and example code on github
  To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder TSL2561. Check that the TSL2561 folder containsTSL2561.cpp and TSL2561.h 
  Place the TSL2561 library folder your /libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
• PCB layout files - public domain