Near-Space Balloon Cam with Arduino and APRS Radio


Build this battle-tested rig to launch, track, and recover a high-altitude balloon that will carry your hacked Canon camera to the stratosphere. With this setup using APRS ham radio and the Trackuino — an Arduino-based communications board — any hobbyist or science class can photograph (and video) the Earth against... Read more »

Super Simple iPod FM Transmitter


FM transmitters can be complicated to build, but not this one — it's about the easiest you can possibly make. And though the science of radio is well understood, there's a magical, emotional quality about it that we don't often stop to appreciate. Building your own radio receiver — or... Read more »

License Plate Guitar

license plate guitar

Continuing the tradition of homemade resonator guitars, follow along as we build a License Plate Guitar. A discarded vehicle's license plate will serve as our metal resonator top. This will be mounted atop a soundbox custom-fitted for the license plate, and the build completed with a hand-wound pickup, bridge, nut,... Read more »

Glow Plug 3D Printer Extruder


Want to upgrade or customize your 3D printer? Build this robust extruder using a handful of tools, one online parts order, and a trip to the auto-parts store. For a heater, it uses a $10 glow plug from a diesel engine — and it performs as well as commercially available... Read more »

Wear Your Heartbeat with a Pulse Sensor and Weekend Projects


The Beatband Sleeve joins a long list of projects attempting to read the human-mechanical heartbeat and visualize it as an electrical signal. Whether using midi controllers or operational amplifiers or infrared technology (and more recently IR in combination with an op-amp), makers love wearing their heartbeats as pendants or simply... Read more »