Eat Some Pringles, Feed the Cat

You know the saying: “Dogs have people, cats have servants.” This is especially true when your feline overlord loses track of time and insists on being fed at oh-dark-thirty. You’re tempted to stay in bed feigning death, but that’s a tall order with the cat sitting on your chest and staring into your soul.

An automatic cat feeder would be nice at moments like these, but off-the-shelf units are pricey. [Mom Will Be Proud] decided to roll his own cat feeder, and the results are pretty impressive for what amounts to a trash can build. Two old food cans form the body — a Pringles can on top to hold the food and a nut can below for the servo. The metal ends of the cans nest together nicely, and with a large section removed from each, an aperture opens every time the hopper rotates, dropping food down a chute. A BeagleBone Black controls the servo, but anything with PWM outputs should do the trick. We’d lean toward the ESP8266 ecosystem for WiFi support for remotely controlling feedings, and we’d probably beef up the structure with PVC tube to prevent unauthorized access. But it’s a simple concept, and simple is a good place to start.

You shall not want for pet feeder builds around these parts. Take your pick — snazzy Steampunk, super cheap, or with an Archimedean twist.

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Drum on a Chip–Not That Kind of Chip

Comedian Mitch Hedberg had a theory about Pringles potato chips. His theory is the company formed to make tennis balls. But instead of a truckload of rubber, someone accidentally sent them potatoes, so they made the best of it. Certainly the Pringles can is an iconic brand all by itself. The cans also have a lot of hacker history, since they are commonly used for WiFi cantennas (even though it might not be the best choice of cans). People also use them to build pinhole cameras, macro lenses, and a variety of cannon-like devices.

[Ian H] uses the short Pringles cans to build a drum kit. Clearly, the little cans aren’t going to make very much sound on their own, but with a piezo speaker element used in reverse, the cans become touch sensors that feed an Arduino and drive a MIDI device. You can see a video of the result, below.

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Pringles can macro photography

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Reader [Harald] sent us this sweet Pringles can macro photography hack from way back in 2005. Using a Pringles can and a standard Cannon 50mm MKII lens, they have produced some amazing results. The image above is the tip of a ballpoint pen. Not only does he go through the steps to make it, but then goes in depth on how to best set your camera and other good practices for macro photography. Pringles cans aren’t just for holding chips and making wireless antenna.

We’ve covered several macro photography rigs before, like how to do macro photography with your iPhone, or with a flip camera, and even how to build a massive laser controlled macro photography setup.