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Ammo Counter for Nerf Gun

wil5on — Tue, 21/06/2011 - 12:58pm

The ammo counter, the most ubiquitous and humble of FPS game elements, but completely absent from Nerf combat (apart from some transparent magazines). I decided to remedy this!

I’ve taken a Nerf Stampede (electric, fully automatic, clip-fed) and added an IR light gate to detect shots, broken out one of the clip insertion interlock switches to detect reloading, and added a display for the count, with an Arduino to act as the brains.

Nerf Gun

My first attempt had the light gate at the front of the barrel, and a 16x2 LCD for display. This worked fine when tested at the space, but both of these elements failed completely in sunlight.

Barrel

For the next prototype, I internalised the sensor by drilling a hole through the barrel and covering the barrel with dark tape (since Nerf plastic transmits some light). I also switched to a simpler 7-segment LED display which should be easier to read and looks cooler.

Prototype

See a video at: flic.kr/p/9V4W9T