Hey, it reminds me of what we did at my former research lab. It was a Computer Human Research team, and we were focusing on ways to measure the interaction lag

Hey, it reminds me of what we did at my former research lab. It was a Computer Human Research team, and we were focusing on ways to measure the interaction lag when using a mouse, a keyboard or a touch device: http://mjolnir.lille.inria.fr/turbotouch/lagmeter/ http://mjolnir.lille.inria.fr/turbotouch/lagmeter/ I participated in writing 2 papers. In the first one, we used an optical mouse on a screen displaying a special texture to measure the end-to-end latency. In the second one, we used an external Arduino (quite similar to what the author did here) connected to a photodiode. For what I remember, the main factor on the latency is the screen, use a gamer screen to improve the delay (CRT screens are told to be quite fast also, but we hadn't access to one to test :'( ).