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John Edgar Park

John Edgar Park

Latest from John Edgar Park

Barch Designs PiHolder

I’ll admit it: I'm an enclosure geek. From the sleek, brushed-metal case I got for my first Mini-ITX computer, to the sheet steel box I wrapped around the electronics in my Nerf Sentry Gun build, I put a lot of thought into selecting the right case for the job. For... Read more »

You may be familiar with the battery-powered, pager motor-driven, toothbrush head bristle bot. This project turns that modern classic into a retro-fantastic, Steampunk delight by replacing the battery with a fire stoked steam boiler, the pager motor with a single-action, oscillating piston steam engine, and the toothbrush head with a... Read more »

The vacuum siphon coffee brewing method dates back to the 1840s. It produces some of the cleanest, smoothest-tasting coffee of any method. Commercial vacuum pots are available, but I wanted to heighten the drama of vacuum brewing by taking it into the realm of the mad scientist’s lab. Thus the... Read more »

Ever been scared to venture into the world of controlling AC power from your microcontroller? Me too. And that’s smart, because household AC can hurt/maim/kill if you’re not careful. The PowerSwitch Tail is a safe, easy-to-use AC relay that is triggered with a mild-mannered 5V DC signal from your Arduino... Read more »

Godshot. That’s the elusive goal of espresso fanatics everywhere. Thick with micro-bubble crema and a velvety mouth-feel, and packing explosive flavor, the godshot is pulled too infrequently for my liking. A perfect shot of espresso is the product of many variables, so anything I can do to lock in one... Read more »

Build a motion-sensing alarm with a PIR sensor and an Arduino microcontroller. Read more »