James Bruton loves Nerf guns, but even the electrically powered versions only shoot one dart at a time. To solve this “problem,” he came up with a launcher that expels 10 darts at a time, and holds a total of 50 darts in five cassettes, giving him five chances to bombard his target.
His build uses a pair of rollers to accelerate the darts up to speed, powered by brushless DC motors and a 6-cell 24V LiPo battery. Speed — and thus launch velocity — is selected by a knob on the massive shooter’s handle, and each set of darts is fired with an arcade-style button. When pressed, servos attached to the loaded cassette push the darts forward into the spinning rollers, accelerating them to the target. Overall control of the blaster is via an Arduino Mega board.
After firing a set of darts, Bruton employs a clever mechanical reloading assembly (outlined around 5:15 in the video above) to release the spent dart cartridge, then lock in the next one that rolls into place. While not the quickest reload procedure, the sheer volume of projectiles that can be sent to the target makes it a formidable foam weapon. This is demonstrated towards the end of the clip, where Bruton and guest Matt Denton get into a small Nerf war, then settle things with a water bottle target competition!