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4hv.org :: Forums :: General Science and Electronics
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Heat seeking Nerf missile project

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Joshua Dickerson
Thu Jul 16 2015, 03:09PM Print
Joshua Dickerson Registered Member #54030 Joined: Fri Dec 19 2014, 06:16AM
Location:
Posts: 8
Hey guys,

I am starting to burn out with work and needed a fun project to take the edge off, so I have been working on a heat seeking Nerf missile. The idea is to use a cheap PIR sensor to somehow lock on to an actual person. I have to make it incredibly light too, because I can imagine a soft piece of foam hurting with enough mass behind it. I already built a massive air cannon to accommodate a 4" diameter projectile. I need some way of putting the seeker head up front, but with some kind of shock absorber so that the impact doesn't hurt. Any ideas?


launch test
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Patrick
Fri Jul 17 2015, 11:15PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Well first, is there a way to detect a person? is a PIR good enough ? Then youll need a microprocessor driven guidance to fins. not sure if PIDs are good enough.

if only the sensor is in the tip, and its light, sort of recessed that may not hurt much. There are ultra micro servos i could show you too for the vanes/fins.
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Carbon_Rod
Sat Jul 18 2015, 08:47AM
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
These IR cams work well:
Link2

Short range turret launched ballistics are relatively simple to predict if the mass of the projectiles and drive force is consistent.

A guidance system may fall under export restrictions.

Best of luck,
Rod
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Patrick
Thu Jul 23 2015, 09:04PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
So sparkfun finnally got the LEPTON, i and someone else here on the forum were trying to reverse engineer the iphone back-pack one.
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mikeselectricstuff
Thu Jul 23 2015, 09:28PM
mikeselectricstuff Registered Member #311 Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
You can now get them at Digikey somewhat cheaper
Link2
Though the launch of the new 160x120 Flir One means you may pick up old Flir Ones even cheaper soon for sensor harvesting.
I reverse-engineered it, a little before the datasheets became available.
Link2
Link2
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