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Topic: Thoughts on automated ways to make a loud "crack" sound? (Read 152 times) previous topic - next topic


I have a project I'm working on at our farm, combining PIR sensors and something that will make a loud noise.  The goal here is to scare wild turkeys.  We have quite a rafter of turkeys all-of-a-sudden, and I'm really concerned about them eating everything in sight come spring.  I'm working on lots of other things, but this particular one has me a bit stumped.

I'm aiming for a sound kind-of like a .22 - so loud enough to freak out the turkeys, but not loud enough to freak out people in the area.  (There are lots of people shooting guns off out there, so a .22 wouldn't be a problem.)  I'd like to be able to repeat the sound if the turkeys come back, but I wouldn't want it to be continuous, or even more than a few cracks per triggering event.

Two things I've thought of, and may do at some point for this part of the problem are 1) make a propane sound "cannon", and 2) make a large Marx generator.  The propane cannon I'd like to wait on, because the farm has neighbors, and I'd have to go to a lot of lengths to make the thing, only to have to make sure it gets used *rarely*.  Those are supposedly not hard to make, but not popular with people, and since this will be unattended, I'd need to put lots of safeguards in place.  Those vary in sound from a 20-gauge shotgun to literally like a cannon.  Ouch.

The other option, I think, is a Marx generator.  I have a few concerns about that
  • It wouldn't be loud enough
  • I only have 12 power at the farm to work with
  • They're also fairly dangerous, so I'd need to shield it a lot
  • While it looks pretty easy to set up, I'd have to give lots of thought to MOSFETs vs. relays for that.  Seems like one of the many good ways to burn out a digital out.

I have thought of speakers, but I'm not seeing a good way to make a sound like that well with speakers.  OTOH, I'm not an audiophile, so maybe that would be easy and I don't know it.

So, the question is, can anyone think of a good way to make a nice, loud "crack" sound, that's relatively easy to automate with an Arduino, that's relatively safe, and that I'm not thinking of? 

Thanks for any thoughts.


Oh, here's one.  https://www.ebay.com/itm/100pcs-lot-11-81in-Electric-Igniter-Electric-Match-for-fireworks-firing-system/132287032256?hash=item1eccebebc0:g:lQsAAOSwTvpZb6yt

Never heard of these before.  Apparently, you apply 12V to one of these, and it lights a small igniter, which you've attached to some kind of firework.  I guess they use these for professional fireworks shows.  So, if I attach the other end to the wick of a firecracker of whatever size, I can get an automated firecracker system, which will do nicely.  The only problem then is coming up with a system to multiplex out 12v power to a bunch of these, in sequence so you're only firing the next one in line, and some kind of safe containment for the whole thing.  Those are feasible.


Is more simple eat all wild turkeys....joke...but if are already many people that use weapons, i think also this wild turkeys is not so scared...so eat eat eat


Have a look at this device:



You have no need of high voltages, a large electrolytic capacitor at low voltage will make an impressively
loud spark too.  A servo-operated contact set could be used to close/open the gap (at low voltage you
have to bring the contacts together).

The contacts need to be beefy as they sustain damage every time they are operated, and may weld together
so good leverage will be needed to guarantee separation each time.

But an even easier approach (simple cheap parts), is a weatherproof horn speaker, audio amp and an audio sample player.  You can change the sound and volume and experiment.
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