I have a breakthrough in a millisecond-accurate input lag tester, that is as almost as accurate as using as an oscilloscope and a photodiode. I am creating photographs on how you can construct your own inexpensive Arduino input lag meter. No soldering iron, no no Electronics 101 knowledge absolutely necessary. Just enough DIY skills to assemble hardware & compile a supplied program.
The Arduino photodiode scope (input lag meter/stroberate meter) will be indispensible for my continuing work on the scanning backlight. PC application will be provided. Watch this blog!
EDIT: See the Sneak Preview.