LED rangefinder

  1. #1
    Andromalius's Avatar
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    Jul 2006
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    Cambridge, MA
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    LED rangefinder

    anyone have schematics of some sort for a LED unit for a hollow rangefinder.
    no offence to hyperdyne, but 62 plus shipping is a little rich for me.
    if anyones tried making one and succeeded, i'd really appreciate a set of prints
    thanks

  2. #2

    Re: LED rangefinder

    I can't give you any scematics... but I can give you advice! The easiest way to get blinking LEDs is buy a cheap piece of electronic that already has such a thing. I picked up one of these fake-car-alarm things at $7, but there should be model-railroad-crossing-lights at less.

    Getting any of these would give you a rangefinder with two red lights that light one at the time, back and forth. Making it turn off in the "up" position would require you to create some sort of contact plates between the stalk and the ear piece, or to get an mercury switch or similar.

    By the way... I really liked the looks of my car-alarm dealy; if my rangefinder would break, I could use it as replacement
    Attached Thumbnails Attached Thumbnails img_1874-2-jpg  

  3. #3
    Buckeye_01's Avatar
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    Nov 2005
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    Hartville, Oh.
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    669

    Re: LED rangefinder

    I drew up a simple circuit for this not to long ago. Let me see if I can find it.

  4. #4
    Andromalius's Avatar
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    Cambridge, MA
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    Re: LED rangefinder

    Thanks for the replies guys, and Buckeye, i'd be in your debt if you found something.
    Thanks again

  5. #5

    Re: LED rangefinder

    I was told to use an "N" battery holder or similar as your power source, a capacitor of some type to make it blink, and the leds which you solder directly to your wiring. Which sounded like French to me then as it does now, so any schematics would be extremely helpful as I want leds on my gauntlets and elsewhere also...


  6. #6
    mrgr8ness's Avatar
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    Re: LED rangefinder


  7. #7
    Charbacca's Avatar
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    Dec 2008
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    Springfield, MO
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    Re: LED rangefinder

    I don't have schematic and what I did is not completely accurate, but since we have a con in a week and parts for the board and leds would not make it on time, I went to Wal-Mart and bought a pair of the blinking socks. They use tilt switches just like you would use to have the leds turn on at a certain angle. The only problem is that they blink a little on the fast side, but for $.50, I'm not going to complain since they will work until the board comes in.

  8. #8
    wolters's Avatar
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    Dec 2008
    From
    Montfort, Netherlands
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    Re: LED rangefinder

    There are LEDs available that blink without the use of a cirquit .
    You just have to hook them up to the right power supply :
    Here's how I did mine :
    I used a hollow stalk and a BM RF.






  9. #9
    Charbacca's Avatar
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    Dec 2008
    From
    Springfield, MO
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    Re: LED rangefinder

    That's interesting and looks fairly easy to do, but I have one question, do they just stay on? I didn't see a tilt switch anywhere. If they do turn on/off at certain angles, please tell.

  10. #10
    wolters's Avatar
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    Dec 2008
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    Montfort, Netherlands
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    Re: LED rangefinder

    There's a reed switch (magnetic switch ) in the ear of my helmet.
    In my gloves there is a magnet built in.

    If I move my hand near the ear of my helmet , the lights come on.

  11. #11
    Boomer Fett's Avatar
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    May 2008
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    God's Country (Oklahoma)
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    Re: LED rangefinder

    By the time you fight with it and get it to fit you will wish you had just spent the money from Mrgr8ness. I know for a fact since I own two and they didn't cost what the others do. Not to mention that Nic is a VERY honorable man and will take care of you. IMO

  12. #12

    Re: LED rangefinder

    Wow, Wolters! That's awesome! I didn't even know those existed! :O Super cool! I just might add real blinking LEDs to my RF after all! (I have "dummy" LEDs in place, because I really didn't want to mess with complicated electronics, but that looks like even I could do! Anyone have any input about some kind of tilt switch? I'm not exactly familiar with a reed switch or mercury switch.

  13. #13
    wolters's Avatar
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    Dec 2008
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    Montfort, Netherlands
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    Re: LED rangefinder

    a tilt switch is also an option , i've seen them called mercury switches .
    I expect them to be available at any good electronics store.

    The reed switch too , by the way.

    The reed switch just works like any other switch , just that it operates not mechanically , but by moving it into reach of a magnet.

    They are limited to a certain voltage , but with batteries and leds this should be no problem.

  14. #14

    Re: LED rangefinder

    Thanks Wolters! Now if I can be a tiny bit more of a pest, what battery did you use there?

  15. #15

    Re: LED rangefinder

    These look great, i think you should do a little tutorial as to how you made it work...

  16. #16
    wolters's Avatar
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    Dec 2008
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    Montfort, Netherlands
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    Re: LED rangefinder



    I hope this helps

  17. #17
    gunnerk19's Avatar
    Member Since
    May 2006
    From
    Northfield, VT
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    174

    Re: LED rangefinder

    OK, I picked up some LED's from RS yesterday, blinking reds and solid greens...

    My question is, if using a (9V) single power source for both reds, they both flash at the same time... how to make them flash alternately?

  18. #18
    wolters's Avatar
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    Dec 2008
    From
    Montfort, Netherlands
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    Re: LED rangefinder

    With this diagram , and using 4.8 V , they start blinking together , but after a few times , their speed starts to differ .

    Maybe if u use a slightly different resistor ?

    I'm no electronics expert either.

  19. #19

    Re: LED rangefinder

    Thanks Wolters, that helps a bit. Let's consider, for arguments sake, that I'm completely electronically stupid. he "reed switch" is the magnetic one, so why is there a manual switch also in your diagram? Is that just showing two possibilities for one location? The tilt switch could also go here instead, correct? And as someone asked before, how would you get them to flash alternately? (you mention a different resitor.. how would that figure into that scheme?)

  20. #20
    wolters's Avatar
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    Dec 2008
    From
    Montfort, Netherlands
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    Re: LED rangefinder

    The manual switch is inside the helmet .
    That's just if I want to show someone how it works/looks.
    It's on display at home , and I don't want to put on my gloves every time somebody wants to see it.
    The tilt switch (or any other switch) could take the place of the reed switch.
    They flash alternately as I made it , But the speed can't be changed. For that you would need the cirquitboard .

    You could play around a little with voltage and resistors , but I wouldn't know what happens then.

  21. #21

    Re: LED rangefinder

    Thanks Wolters, thats really helpful! It gives me renewed interest in lighting up my suit! I had tried rigging up a servo, but I fried my RC board because I'm thoroughly inept with electrical wiring.

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