This month I came up with an idea on how to use the Blinkenlight shield to detect the frame rate of my camera http://blog.blinkenlight.net/experiments/measurements/detecting-frame-rates/
. The frame rate was not exactly where it should be.
If anyone is going to measure their cameras I would like to learn what numbers you find out. You can copy the experiment without my shield. With enough patience it can be done without any additional parts (just LED 13 is sufficient). Of course 20 LEDs provide more convenience
So what are your numbers?