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Thread: Low cost lap-timer...interested?

  1. #16
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    If you could do one with a beacon like the pro units, that would be better. They cost from around $400~450 up to $800~900. There was someone else interested in making them earlier, after I was asking about them:

    http://www.kiwibiker.co.nz/forums/showthread.php?t=3597

  2. #17
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    Quote Originally Posted by skelstar
    Detector counter? If so then check out the other reply. ta.
    Sorry detonator counter. Have always been curious as to whats going on inside my engine. In hindsight, scratch that idea. It's not building the electonics that'd be the difficult part - its the fitting of it on the bike which would be a nightmare.
    If it ain't a V twin, it ain't worth shit.

  3. #18
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    Quote Originally Posted by skelstar
    Chicken .
    don't blame me, I crashed twice before simply for daydreaming
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  4. #19
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    Quote Originally Posted by wendigo
    Sorry detonator counter.
    you're not part of Al-Qaeda are you?
    Elite Fight Club - Proudly promoting common sense and safe riding since 2024
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  5. #20
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    Quote Originally Posted by bugjuice
    using some low vol FM, it wouldn't have to be line of sight. but then it could fail it's accuracy. Even if it was line of sight, it'd be too hard to get a reading, cos the bike would be in a different position each time it passed. Do some intramanet search and see what systems are in use already, and just 'borrow' some ideas and make it cheaper
    True, multiple riders multiple channels too. Would have columnate/focus the signal but then that would be reasonably consistent each lap. Ill have search tonight...when I have time away from KB .
    "If life gives you a shit sandwich..." someone please complete this expression

  6. #21
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    Quote Originally Posted by Marmoot
    you're not part of Al-Qaeda are you?
    Nah - being part irish, PIRA is the terrorist organisation of choice in my neck of the woods. Tiocfaidh ar la and all that bullshit...
    If it ain't a V twin, it ain't worth shit.

  7. #22
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    Quote Originally Posted by Marmoot
    don't blame me, I crashed twice before simply for daydreaming
    Daydreaming is what you do when you are not riding. I hope you were at least daydreaming about bikes...or boobies.
    "If life gives you a shit sandwich..." someone please complete this expression

  8. #23
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    It's normally an IR beacon and sensor.

  9. #24
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    Quote Originally Posted by Drunken Monkey
    It's normally an IR beacon and sensor.
    True...IR would be good.
    Problems:
    1. what about two bikes crossing the signal at the same time?
    2. Is everyone capable of seting the thing up on their bike and trackside?
    3. Environmental issues could = customer issues . Nobody wants that, and if they do they want more money.
    "If life gives you a shit sandwich..." someone please complete this expression

  10. #25
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    Quote Originally Posted by skelstar
    True...IR would be good.
    Problems:
    1. what about two bikes crossing the signal at the same time?
    2. Is everyone capable of seting the thing up on their bike and trackside?
    3. Environmental issues could = customer issues . Nobody wants that, and if they do they want more money.
    Not too sure how they resolved the problems with item 1, but this is how pro timers work and I haven't heard of problems.

    Yes. Sometimes you see a pile of senders at the side of the track. However I have also read that if a track has a sender built in, some brands can run off the track's sender. Also, if say one person buys a "rollcentre" receiver and sender, his mates only need to buy a "rollcentre" receiver. Same principle with "demon tweeks" and the other good brands as well.

    ...and as usual it will probably work out more expensive to make them than to buy units already on the market...

  11. #26
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    Quote Originally Posted by skelstar
    True...IR would be good.
    Problems:
    1. what about two bikes crossing the signal at the same time?
    use x-ray or Gamma ray. They will solve this particular issues.
    Of course then if we don't wear protection for the Testicular area we'll get children with 3 eyes at later dates.

    The real answer for 100% accuracy would always point to the magnetic strip then?

    But I guess IR sensors would be sufficient for trackday. Not often you get to pass side by side on racetrack on trackdays.
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  12. #27
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    Quote Originally Posted by Marmoot
    use x-ray or Gamma ray. They will solve this particular issues.
    Ha thats funny. I am an electronics engineer for nuclear scientists. Technically I am a radiation worker.
    It would solve one issue, but open a whole big can of worms (not testicle related).
    "If life gives you a shit sandwich..." someone please complete this expression

  13. #28
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    Quote Originally Posted by skelstar
    Hey guys,

    Im not a racer but I AM an Electronics Engineer.

    I kinda had the idea of building a very low cost/budget lap timer. What Im thinking is purely having a box with a simple display on your handlebars and a trigger located very near one of your handgrips. The idea (havent fully thought it through yet) is that you would pull the trigger as you go through the start/finish or a fixed point on the circuit. The display would tell you the elasped time since you last 'pulled the trigger'.

    Questions:

    Would anyone be interested in buying one? (very low cost, not looking to retire on this product).

    Is there something that already does this?

    Is it too simple, difficult to use? Remembering that it could be any fixed point on the circuit. You could even do the timing through a section of the course.

    Thinking about hiring them out at trackdays/races too maybe...


    What do people think? Enough interest may warrant further investigation.
    Great idea -not for me, but as a possible suggestion, have it triggered by something external - make it wickedly accurate. A strip of white tape on the road somehow triggering it?
    $2,000 cash if you find a buyer for my house, kumeuhouseforsale@straightshooters.co.nz for details

  14. #29
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    Quote Originally Posted by ManDownUnder
    Great idea -not for me, but as a possible suggestion, have it triggered by something external - make it wickedly accurate. A strip of white tape on the road somehow triggering it?
    Hmmm...not a bad idea. Would have to make sure it didnt trigger by passing over a white line, and I dont want to determine colours (ie yellow tape). The less environmental influences the better.
    Thanks everyone for the feedback though. Keep it coming! .
    "If life gives you a shit sandwich..." someone please complete this expression

  15. #30
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    I did a similar thing a couple years back and made a laptimer using a BS2 microcontroller plus 4x20 LCD and mounted a trigger button on my handle bars. It was very clumsy and limited but did the basics.

    I now use one of these laptimer stopwatches and wired up the lap button to my horn button and it velcros to the top of my triple clamp. It does a great job for a fraction of the price and is way more convenient. I did plan to connect up an IR sensor trigger + beacon but never bothered because it does an adequate job as it is.

    So you might want to consider this before attempting to reinventing the wheel.

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