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  1. #1
    Senior Member vladav's Avatar
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    Timing system for street sprints?

    Looking for an affordable (< $200-300) timing system to measure E.T. of flying 200 meter street sprints...

    It's just for fun, and it's just a club event, but our last session left a bit to be desired in the timing accuracy/repeatability department.

    I have no idea where to begin looking?
    DIY kits
    Manufacturers
    DAQ+laptop

    Thanks for any suggestions,
    Dave

  2. #2
    ride lots be safe Creakyknees's Avatar
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    a flag in the starter's hand and a stopwatch at the finish line?
    "have fun and be kind"
    - an internet post

  3. #3
    ..... Jynx's Avatar
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  4. #4
    Senior Member vladav's Avatar
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    Quote Originally Posted by Creakyknees View Post
    a flag in the starter's hand and a stopwatch at the finish line?
    Definitely affordable (That was our setup, but distractions ravaged our guy with the stopwatch)

  5. #5
    ride lots be safe Creakyknees's Avatar
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    well get a different guy. it's not the system's fault.
    "have fun and be kind"
    - an internet post

  6. #6
    Senior Member vladav's Avatar
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    Quote Originally Posted by Jynx View Post
    Cool, thanks! I'll add that to the high zoot options (If the wire alone $200, then the box has got to be a lot more one would assume, right?)

  7. #7
    Senior Member vladav's Avatar
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    Quote Originally Posted by Creakyknees View Post
    well get a different guy. it's not the system's fault.
    True enough - that's why we're looking for an "electronic guy"

  8. #8
    Senior Member vladav's Avatar
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    Found a DAQ for $118 + a bit more in materials & free labor. That's kinda looking like the way so far...

  9. #9
    slow as I ever was Ex Pres's Avatar
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    You can get printing stopwatches.
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
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  10. #10
    Senior Member vladav's Avatar
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    Quote Originally Posted by Bob Barker View Post
    You can get printing stopwatches.
    Yeah I've seen those used on the track but not up close. Are they timestamps where you could use 2 (one at each end) and subtract the difference?

  11. #11
    Announcer EventServices's Avatar
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    Please get impartial holders. You don't want a brooha like the one in Athens OH a few years ago.

    In the women's heats, one rider's coach from the old EDS team stepped in at the last minute and held his rider. At the ***, he threw her ahead by three bike lengths. I saw the whole thing happen. And the whole argument that followed.

  12. #12
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    Quote Originally Posted by vladav View Post
    Yeah I've seen those used on the track but not up close. Are they timestamps where you could use 2 (one at each end) and subtract the difference?
    I think what you do is decide on start times (every minute? 3 minutes? Whatever?) then you do the start based on the time. Synchronize a watch to the timer.

    5:00:00.00 Go!

    Then when the rider crosses you hit the button. The timer thing prints out the next "lap" time, which could be, say, 5:00:15.28

    Then the time would be 15.28.

    Subtraction, although it seems easy, gets tricky when amped up guys are asking for their times. I've screwed up basic math a few times under those situations.

    cdr

  13. #13
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    Quote Originally Posted by carpediemracing View Post
    I think what you do is decide on start times (every minute? 3 minutes? Whatever?) then you do the start based on the time. Synchronize a watch to the timer.

    5:00:00.00 Go!

    Then when the rider crosses you hit the button. The timer thing prints out the next "lap" time, which could be, say, 5:00:15.28

    Then the time would be 15.28.

    Subtraction, although it seems easy, gets tricky when amped up guys are asking for their times. I've screwed up basic math a few times under those situations.

    cdr
    If its a flying 200, then you can't just go by arbitrary start times, the clock begins as the rider passes the start line at full speed line and finishes as he crosses the finish line.
    Il faut de l'audace, encore de l'audace, toujours de l'audace

    1980 3Rensho-- 1975 Raleigh Sprite 3spd
    1990s Raleigh M20 MTB--2007 Windsor Hour (track)
    1988 Ducati 750 F1

  14. #14
    slow as I ever was Ex Pres's Avatar
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    For formal races, to expand on CDRs method of synchronization, for our TTs we assign your race number with the time start, ie. if you're starting @ 8:05 then your [jersey] number is 805.
    Last edited by Ex Pres; 07-15-09 at 03:05 PM.
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 600____________ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/b\k)___02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

  15. #15
    meh... Jarpmann's Avatar
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    find some old light sensors from the garage door safety systems, get a simple DAQ and a laptop. probably need to spend some time setting up the sensors, but i would bet it would be quite precise(though maybe not accurate due to lag time?) once set up.

  16. #16
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    Quote Originally Posted by San Rensho View Post
    If its a flying 200, then you can't just go by arbitrary start times, the clock begins as the rider passes the start line at full speed line and finishes as he crosses the finish line.
    Ah. Didn't see "flying" in the OP. My bad.

    If solo riders, have a big light and a mirror angled to the finish line guy. Have either a camera (video) or a quick reaction guy.

    When the flying sprinter breaks the light, start the timer. Stop at finish. Mirror (could be a door mirror or even the side of a shiny car) acts to allow timer at finish line to see when rider passes "start".

    If using video camera, import into something like Windows Movie Maker and see where the rider breaks the start "light" (in the mirror) and when the cross the line. Set up properly you could probably catch both the start and finish without moving the camera. Since it films based on time, movement is fine as long as the camera captures the start and finish.

    cdr

  17. #17
    Senior Member vladav's Avatar
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    Quote Originally Posted by Jarpmann View Post
    light sensors from the garage door safety systems, get a simple DAQ and a laptop.
    Ahhh! Yes! That was the last piece of the puzzle - cheap sensors. The DAQ is $114, Laptop is 'free', and the sensors are about $30-40ea.

    The inductance lag time can be compensated pretty easily, and any sensor lag would be equal for start & finish.

    Thanks all for the suggestions!

  18. #18
    Announcer EventServices's Avatar
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    I didn't catch the "flying" in the OP, either. 200m FLYING street sprints?
    You're mixing your metaphors. You can do a 200m TT with a flying start, or you can do a 200m straight line street sprint.

    As long as the timing is consistent, that's all that matters, right? So don't waste a lot of money getting too sophisticated.

  19. #19
    Senior Member vladav's Avatar
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    Quote Originally Posted by EventServices View Post
    You're mixing your metaphors.
    don't waste a lot of money getting too sophisticated.
    Metaphor vs Description

    You know this is a sport where folks spend $6k where $2k will do just fine, right?

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