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Thread: DIY Poor Mans Chrony

  1. #1
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    Default DIY Poor Mans Chrony

    Hi guys, I just want to post a few pics, although theres not really much to see. I built a chrony based on a this website below, which I found when browsing on this forum. Some guys complained it didn't work but I have found mine to work perfectly.

    I made the sensors exactly 1 foot apart and rather powered the led emmiters in parallell using a standard penlight battery. No resistors involved.

    the receiver leds were connected to the speaker cable and it works perfectly to time the pellet through point one and two.

    I used a 17mm pipe OD and had a friend machine the first two inches or so to 15mm ID so it would fit over my CZ 200's barrel.

    See pics. If you have any questions, I will try and assist.

    BTW: it cost R16 to build.

    Very cheap DIY Chronograph ~ Air Rifle SA Forums

    New Updated 2.0 Version of Poor Man's Chrono - Yellow Airgun Forum Archive

    Poor Man's Electronic Chronograph - Yellow Airgun Forum Archive
    regards
    Thys

    Last edited by thysmeades; 12-12-11 at 10:26.
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  2. #2
    Sharp Shooter

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    Well done! Could you please supply the "website below" - as I would like to investigate as well...
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  3. #3
    Sharp Shooter

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    Very nice , thanks for sharing ,

    How you get a reading visible to human eye ?
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  4. #4
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    I plugged cable into Mic input on laptop and select microphone input when pop up window appears (I run new windows 7 professional)

    download softchrono (free) and unput settings as shown in picture

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  5. #5
    Sharp Shooter

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    I'll pay R50.00 if u will make me one. u dont even need to post it.
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  6. #6
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    Quote Originally Posted by archy View Post
    I'll pay R50.00 if u will make me one. u dont even need to post it.
    I see you are a local chap. you are more than welcome to borrow it.
    Thys
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  7. #7
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    Have you possible cross referenced your results with results from a proper chrony to determine the home made chrony's accuracy?
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  8. #8
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    Quote Originally Posted by Elmar_96 View Post
    Have you possible cross referenced your results with results from a proper chrony to determine the home made chrony's accuracy?
    No, but if there is a brave soul in PE willing to lend me a chrony, I would gladly do comparison tests.
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  9. #9
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    Could you also possible post specs for the exact type of LED's and receivers you used. I am also keen on building on and would be interested to know what you used.
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  10. #10
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    Quote Originally Posted by thysmeades View Post
    No, but if there is a brave soul in PE willing to lend me a chrony, I would gladly do comparison tests.
    Where du we find him/her in this town?
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  11. #11
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    the blue LED IR emitters were 20mA and the white IR receivers were also 20ma.
    cost me R5 per pair from Cosmotronics as well as a R5 switch. I bought a R1 resistor which I didn't end up using as I wired them in parallel off a penlight battery.
    easy..
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  12. #12
    Sharp Shooter

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    If I have a 96kHz sound card, decent one, can I then work on a possible measurement once every 0.349cm for a pellet going at 335m/s-1?... therefore a 4cm tube should be good for 10+ measurements and should be long enough to get a decent reading, or should I go to 10cm for over 40 measurement opportunities?
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