World Control Panel
Global domination for the young evil genius.
Perf board
Secret-Knock Gumball Machine
Make a cute candy vending machine that only dispenses treats when you knock the secret rhythm on its front panel.
Cellphone Car Ignition
Remote-start your ride from any distance, sans key fob.
Geiger Counter
This DIY Geiger counter clicks and flashes an LED each time it detects a radioactive particle. It works with most common Geiger–Müller tubes, and easily connects to radiation rate meters, data loggers, true random number generators, and the Radiation Network’s GeigerGraph software. Share your radiation readings with the whole world!
Tacit: A Haptic Wrist Rangefinder
Tacit is a wearable system that translates the distance to anything you aim your hand toward into pressure on your wrist. The closer the object, the greater the pressure. Sweep your hand around, and the device conveys to you a tactile image of your surroundings. I designed Tacit to help vision-impaired people navigate their environments, […]
Trippy RGB Color-Mixing Nightlight
For this variation on the original Trippy Nightlight an inexpensive (> $2.50) USB AC charger provides a traditional nightlight plug-in-the-wall form factor. To simplify the main circuit board I removed the download circuitry from the board and instead programmed the PICAXE 08M microcontrollers on a separate breadboard. Instead of a quartz crystal, two Jell-O snack-size […]
Water Leak Detector
The average life expectancy of a hot water heater is about 10 years, so it’s not a question of if it will leak — it’s simply a matter of when. In my part of the country, homebuilders have been installing these tanks in the attic. This saves space, but also means that if you don’t […]
