Re: Lightning detector based on DSP
- Thansk everyone for your answers.
MArk, your detector seems to be very interesting. Above all because
it uses a processor, which is very rare in the existing lightning
detectors over the world.
> The simplest way to detect the lightning strike is usingcircuitry to detect
> how strong the strike is, very few components needed.reading
> On detecting a strike the processor takes the voltage level
> (strength) & adds a number into a variable.That's what i want to do. But in order to determine the distance
from the measured voltage, we must know the relation between the
distance of a storm and the voltage we measure at reception. Do you
know this relation? I searched everywhere on the net and didn't find
it. How do you concretely calculate the distance?
> After counting these strikes for 4 minutes (i chose 4 minutes, youcould
> choose 1 minute ect), depending on the value counted depends onhow many led's
> it lights up.I don't understand why you count the strikes. Could you explain ?
> I'm actually using my VLF antennae for this, a handheld devicewith a
> telescopic whip could be used but that means having a whip stuckout while your
> walking around.you of
> There are small handheld devices for sale that use led's to warn
> incoming lightning which don't have an antennae sticking out, theymust use a
> small wound coil instead of a whip (i think).The antenna i have to use is an antenna based on a "baton de
ferrite" in french. I'm not a specialist about antennas so i can't
tell you what it is exactly.
> Using DSP in a handheld device i would imagine to be quitedifficult for an
> amateur, maybe someone in this group could help you more there.As far as DSP is concerned, i know how to use it. I already worked
on it so the issue doesn't really comes from the DSP. The issue is
how to calculate this famous distance!
> I just thought i'd give you my idea using a processor chip as it'svery easy
> & upto now the one i have built & been testing for a few daysseems to be
> working good.Thanks for your help. It's very interesting. Can you give more
details about your device?
Thanks again. (to everyone who answered to my query).
I used a simple relation that gives the distance thanks to the dispersion of
a tweek, you can see it at: www.vlf.it/thierry/waveguide_propagation.html .
Maybe, it can be done with a DSP...
Thanks, from Thierry.
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