Geiger Counter Kit


Commercial Geiger counters can cost hundreds of dollars. Build your own at a fraction of the price! This easy-to-solder kit can be built in an evening and it works just like you think it would; clicking and blinking in the presence of radiation. Just follow the instructions here to build... Read more »

DeskLights 2.0


The desk receives event notifications over the network and alters its color and pattern to provide those notifications to the user. The combination of color and location can be used to communicate a wide variety of information. Simple flashes of different colors inform me of new e-mail, phone, or chat... Read more »

Sun Logger


A data logger is a device that is left to run for long periods of time, making regular measurements of external sensors. We’ll be using the Arduino microcontroller and a homemade “shield” (an Arduino accessory board) to create a device that gathers data on light-brightness in an area and how... Read more »

Monkey Couch Guardian


My cats like to jump on furniture and shed their fur, which ends up on my clothes. To stop them, I’m using a Monkey Couch Guardian. I made it from one of those old-fashioned cymbal-banging toy monkeys, modified with an inexpensive Arduino microcontroller and a proximity sensor. Now when a... Read more »

IR Jammer Kit


These directions were adapted from The IR Jammer project is microcontroller-based; what this means is there is a small self-contained computer that controls the unit. The IR Jammer will cause most infrared remote controls to stop working. This means that you could prevent someone from changing the TV channel... Read more »

Small Word Clock


This word clock has a lot of small steps that add up to a moderately difficult build. You’ll be building three circuit boards, possibly making (or modifying) a frame, soldering SMD parts and playing around with finicky die-cut stickers. However, the end result can be very satisfying. If you’re concerned... Read more »