April 16, 2011, 9:44 pm - James Farrer
Today while playing with the Arduino my Mom got me for my birthday, I was able to set up a rudimentary light meter. I took the input from a photocell and converted that signal to a range that corresponds to 5 LED's.
I also set it up to learn what the ranges are from the photocell. So if you start it up it will show relative light levels. E.g. In a dark room it will show full light reading down to zero. But if you add light to the room it will adjust the upper bound and scale everything accordingly.
Also, this was my first upload to YouTube. Not exactly the highest quality, but it shows the lights working when I cover up the photocell.