u/SquareOrbits

A lot of fun to build. There are no transistors, Arduinos, or ICs, just simple switches and some clever wiring to give this robot the ability to avoid obstacles. Original circuit by Jérôme Demers.

Edit: As requested, here's a build guide.

This is powered directly with a buck converter via a USB source, so it can be left on 24/7 without worry of the battery swelling.

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To prevent burn-in the screen is on low brightness and I'll get around to automating turning it off during the night with Tasker.

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Video with more details here