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Dodecahedron Speaker for Desktop 3D Printers

Dodecahedron Speaker for Desktop 3D Printers

At normal listening distances, an array of twelve speakers arranged on the faces of a dodecahedron is a very good approximation of a point sound source, and the sound waves it produces are very close to perfectly spherical. A dodecahedron speaker can be a useful tool in acoustics research, and is definitely a fun toy […]

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Fetch-O-Matic: Automatic Ball Launcher

Fetch-O-Matic: Automatic Ball Launcher

Several years ago I watched a viral YouTube video that starred Jerry the Dachshund, whose engineer owner had built him his very own automated ball launcher. I had two dogs at the time, and was also unemployed with some time on my hands, so I decided to try my hand at building one. After a […]

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Covert Listening Book

Covert Listening Book

Connect a shirt pocket “amplified listener” hearing aid with an in-car FM transmitter, and you’ve got a wireless bug. Tuck them inside a hollowed-out book with the mic concealed by the dust cover, and you’ve got a covert listening device that you can leave lying around or on a shelf near a surveillance target. Then […]

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Luminch One

Luminch One

Luminch One is an interactive lamp controlled by the movements of your hand. Wave your hand over it to turn it on or off, or move your hand up or down above it to change its brightness. Inside the lamp, an Arduino hooked to an infrared distance sensor tracks your hand and sets the state […]

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