Microsecond Arduino Due Code and Schematics accompanying the paper presented in IEEE VR 2020 "Measuring System Visual Latency through Cognitive Latency on Video See-Through AR devices" [1] https://www.microsoft.com/en-us/research/publication/measuring-system-visual-latency-through-cognitive-latency-on-video-see-through-ar-devices/
The clock starts from zero and continues to displayelapsed time since the device was powered on. The LED turn-on andturn-off time is sub-microsecond [2], therefore we know that ourclock is sufficient for at least 0.1 millisecond measurements as theLEDs turn on and off faster than we are updating the digit segments.
This clock can be then visualized through an external observer [3] using high refresh cameras.
[1] Gruen, R., Ofek, E., Steed, A., Gal, R., Sinclair, M., & Gonzalez-Franco, M. (2020) Measuring System Visual Latency through Cognitive Latency on Video See-Through AR devices. IEEE VR 2020
[2] Lee,T. P. (1975) Effect of junction capacitance on the rise time of led’s and onthe turn-on delay of injection lasers. The Bell System Technical Journal,54(1):53–68, Jan 1975.
[3] Wu, W., Dong, Y., & Hoover, A. (2013). Measuring digital system latency from sensing to actuation at continuous 1-ms resolution. Presence: Teleoperators and Virtual Environments, 22(1), 20-35.
Schematics created with Eagle v 9.5.2.
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