The QuantifiedSelf forum recently had an interesting thread on how to track light exposure. By collecting light data one can search for correlations with mood, stress, weight, activity and sleep. This could be helpful for several different purposes.
Time Spent Outside
Vitamin D Exposure
Light Color Temperature (circadian rhythms)
The following hardware and apps were suggested for light tracking:
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.