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[DPRG] "A great Arduino project for people who really like blinking LEDs."

Subject: [DPRG] "A great Arduino project for people who really like blinking LEDs."
From: ed at okerson.com ed at okerson.com
Date: Wed Sep 30 23:26:21 CDT 2009

I wonder if this thing would have any similar effects on wildlife.  Out at
my deer lease we have a bad infestation of feral hogs.  They are big, fast
and mean, and they tear everything up.  If I could temporarily
incapacitate them it would make them a whole lot easier to shoot!

Ed


> Interesting, Dale!  If the element can react as quickly as you say, then
> nothing complicated may be needed.
>
> I was thinking of doing it asynchronously for the first few pulses, then
> after the rough frequency was determined, predict (guess) the leading edge
> of the subsequent pulse so the blanking can start before the next pulse
> arrives (and remain opaque until after the pulse has gone away).  Measure
> the time between the guessed start of the blanking period and the next
> actual light pulse, rinse and repeat.
>
> We know the pulses are in the 8-13 Hz range.  I didn't read enough of the
> article to know the duty cycle.
>
> Only $50 for a cheap welding helmet, huh?  Hopefully my current project
> will
> be done at the end of October...
>
> -J
>
> On Wed, Sep 30, 2009 at 7:09 PM, Dale Wheat <dale at dalewheat.com> wrote:
>
>> David,
>>
>> No, the welding masks react to each flash of light, asynchronously.
>> They
>> don't try to match any frequency.
>>
>> Remember:  Always use your LEDs for good, never for evil.
>>
>>
>> Thanks,
>>
>> Dale Wheat
>>
>> (972) 486-1317
>> (877) DALE WHEAT
>> http://dalewheat.com
>>
>>
>> dpa wrote:
>>
>>> So then we'd need frequency-hopping on the "weapon."  I feel an arms
>>> race coming' on...
>>>
>>> dpa
>>>
>>>
>>>
>>> Dale Wheat wrote:
>>>
>>>> Jeff,
>>>>
>>>> When a group of us took welding last January, we were told the element
>>>> darkens in a matter of microseconds in even the cheapest units
>>>> (~$50).  The higher-end units were rated in nanoseconds, which
>>>> everyone knows are too small to actually exist.
>>>>
>>>> So sure you could easily and inexpensively build a counter-weapon to
>>>> this 'bedazzler'.  The trick is to completely seal the optical path as
>>>> even reflections seem to have a detrimental physiological effect.
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> Dale Wheat
>>>>
>>>> (972) 486-1317
>>>> (877) DALE WHEAT
>>>> http://dalewheat.com
>>>>
>>>>
>>>> Jeff Koenig wrote:
>>>>
>>>>> Interesting link!
>>>>>
>>>>> I suddenly have an urge to modify one of those electronically
>>>>> controlled, self darkening welder's masks with a front-mounted
>>>>> photodiode sensor.
>>>>>
>>>>> If the optical element on the mask transitions quickly enough, I bet
>>>>> it wouldn't be hard to rig up something that would autoblank an
>>>>> offending 8-10 Hz bright light.
>>>>>
>>>>> Of course, I'd open source it, too.
>>>>>
>>>>> -Jeff
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Tue, Sep 29, 2009 at 5:21 PM, dpa <dpa at mail.isem.smu.edu
>>>>> <mailto:dpa at mail.isem.smu.edu>> wrote:
>>>>>
>>>>>
>>>>>    http://ladyada.net/make/bedazzler/
>>>>>
>>>>>
>>>>>    Dale?
>>>>>
>>>>>    cheers!
>>>>>    dpa
>>>>>
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