In one of the most unique DIY projects, Reddit user PickentCode has created what can be described as a completely off-the-grid "heat engine computing device." Instead of relying on solar panels or a battery pack, the creator went in a completely different direction, building a custom steampunk-inspired microcomputer which features a miniature Stirling engine to power the hand-crafted wooden console.
Originally patented in 1816 by the Scottish minister and inventor Robert Stirling, a Stirling engine converts heat directly into mechanical energy. By applying a flame to one end of a sealed cylinder, the temperature difference forces the air inside to expand and contract. This cycle pushes a piston that spins the flywheel, which can be used to power a simple generator that converts the mechanical rotation into usable electricity.
