13 replies to this topic

[yennepnollad]

Okay, before you tell me it's impossible here is how it all works:

1. The whole thing is in 2 parts, minus the battery; the shotgun, and the sensor and associated electronics.
2. It utilizes a PIR sensor (Passive Infrared) in order to detect when a person has stepped in front of it.
3. It also has a remote trigger function, allowing the user to time exactly when the whole thing fires.
4. It is all powered by a 12 volt, 7.2 amp/hour gel cell battery

I'm sorry but this is not a tutorial on how to build one, it is far too time consuming and costly to really be considered a feasible tactical advantage.

Alright then, so here is the schematic for the electronics. I am not really an expert in drawing these things, so feel free to point out any mistakes.



So here is the thing in action:



http://youtu.be/Q8atrwWokEQ

So here are some pictures of the internals and the shotgun and stuff:

[chavez guy]

I don't really get it. Probably because I just skimmed it.

But it has pictures. Therefore it must be true!

Could you explain more how the darts are propelled? I'm not quite understanding this part. I understand they are spring loaded or something, but I am not sure how the party popper part works.

[yennepnollad]

I don't really get it. Probably because I just skimmed it.

But it has pictures. Therefore it must be true!

Could you explain more how the darts are propelled? I'm not quite understanding this part. I understand they are spring loaded or something, but I am not sure how the party popper part works.

Sure thing. The motor inside that pvc tube is turned on when the sensor senses someone. That motor then turns the base of a spring powered party popper, which then propels the darts outward 15-20 feet, depending on the angle. I got some of my inspiration for this design from HERE

[Ozymandias]

My God, a functional Nerf mine that doesn't rely on a mousetrap mechanism or something that could hurt somebody.

Props.

[roboman]

Fritzing might help you make better schematics in the future.
Are you just controlling the transistor directly from the PIR sensor, or are you using some sort of a microcontroller?

[chavez guy]

Sure thing. The motor inside that pvc tube is turned on when the sensor senses someone. That motor then turns the base of a spring powered party popper, which then propels the darts outward 15-20 feet, depending on the angle. I got some of my inspiration for this design from HERE

Ah, I get it. There is some sort of catch mechanism at work, which is disengaged when the motor turns it.
Very cool! I could see these being widely used in some sort of objective game. Or not.

Either way, this is probably the first landmine thread I've seen that doesn't suck. And is actually good. And I have been lurking for a loooooong time.

[Exo]

Thank god for non-noobish noobs. Nice job.

Unless you have a camera with areally small memory amount, take multiple pics of the same thing, that way you can try to find the least blurry.

[shmmee]

Perfect timing! My brother hopes to build a scale model of a turret from portal (as seen here: instructables - portal turret) and asked me if we could work a nerf gun into it somehow. I was thinking of doing a fly-wheel clip fed thing, but didn't have any idea how to activate it.

[yennepnollad]

Fritzing might help you make better schematics in the future.
Are you just controlling the transistor directly from the PIR sensor, or are you using some sort of a microcontroller?

Since I am on a strict budget of no money whatsoever, I decided to forgo using a micro controller. Besides, you really don't need one as long as you only have one single bit output to worry about, and you only have one end result in mind for your invention.

[yennepnollad]

Just in case some REALLY wants to build this and they don't mind forking over some serious dough to radio shack, here is the bill of materials

Bill of Materials


If someone wants I can type up a procedure, though I doubt anyone wants to try to make this thing.

Edited by yennepnollad, 30 September 2011 - 02:56 PM.

[roboman]

forking over some serious dough to radio shack

You know, almost all of those parts could be purchased for roughly 1/4 of the Radioshack price through online suppliers, such as Digi-Key or Jameco. Radioshack is just about the WORST place to buy anything other than cell phones now (and even then). They've basically ceased catering to the electronics hobbyist, as their component aisle consists of a few drawers with a limited selection of overpriced components.

[Langley]

Fritzing might help you make better schematics in the future.

Making new parts (that aren't already in their parts database) is a bit of a challenge, but otherwise this really is the easiest way to make a schematic. You just lay out parts on the virtual breadboard, and it generates a schematic for you.

Since I am on a strict budget of no money whatsoever, I decided to forgo using a micro controller. Besides, you really don't need one as long as you only have one single bit output to worry about, and you only have one end result in mind for your invention.

You mean you don't want to stick an Arduino on it and make it post to twitter? Think of all the RGB LEDs you could stick on there....

You know, almost all of those parts could be purchased for roughly 1/4 of the Radioshack price through online suppliers, such as Digi-Key or Jameco. Radioshack is just about the WORST place to buy anything other than cell phones now (and even then). They've basically ceased catering to the electronics hobbyist, as their component aisle consists of a few drawers with a limited selection of overpriced components.

They are making a real effort to change that. The parts are still expensive compared to the online suppliers, but there's no shipping, and if you need something today, it's the only choice. They came to NYC Makerfaire this year and it was obvious that they are really trying to reconnect with the hobby community. Of course this doesn't change the fact that they'll gouge you, and their staff won't know anything about that corner of the store, but that's retail for you.

Edit: I see your land mine and raise you an 80's robot with a Stampede arm.

[roboman]

They are making a real effort to change that. The parts are still expensive compared to the online suppliers, but there's no shipping, and if you need something today, it's the only choice. They came to NYC Makerfaire this year and it was obvious that they are really trying to reconnect with the hobby community. Of course this doesn't change the fact that they'll gouge you, and their staff won't know anything about that corner of the store, but that's retail for you.

That's certainly a good thing. However, if you can find a small electronics store near you, they will often have very low prices, extensive knowledge, and a large selection of items. For example, JK Electronics is about 30 minutes from me, and they have all of the above. Unfortunately, many of these small stores are going out of business, so you might have a hard time finding one.

[yennepnollad]

Edit: I see your land mine and raise you an 80's robot with a Stampede arm.


[/quote]

That is sweet! Does it chase you around while screaming "Danger! Will Robinson, Danger!"?