Distance Gun!
thingiverse
https://www.youtube.com/watch?v=4_3eWmtzKNo The DIY Distance Gun is a gun that I made that measures distances and velocities using the power of infrared and ultrasonics. It worked out mediocrely, and it's somewhat useful for taking inaccurate distance measurements, and very inaccurate speed measurements. And hey, I almost got hit by a car in the process, so that was great. Anyways, here's some info below, just watch the video.
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