How it works
The engineering behind the app: clock sync, photo finish, the relay, and the data model.
- How clock sync works across a dozen devicesEvery device continuously measures its offset from one shared time source, so times captured on separate phones are directly comparable.
- How the acoustic start worksThe device timestamps the gunshot itself rather than a human reaction to it, using the audio hardware's own clock, an impulse detector tuned to miss rather than guess, and two layers of calibration.
- How the photo finish camera worksOne camera images a single line at the finish, hundreds of times a second. Stacking those slivers over time freezes the action across the line.
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