Interesting. You could sync the computer time and start time, have predefined start time slots, record the finish times on laptop. Plug into Excel and do some subtraction. Still some error however.
How would the mouse button be triggered?
Also I think all you need to record is the first trigger time which will most likely be entered immediately into some sort of spreadsheet by the race official since there is usually some time in between riders. De-bounce is nice but probably not needed as it can introduce other headaches if its doesnt work properly.
Just my .02 -- stuck at the office waiting for files to arrive :0
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