Here’s a novel way to take measurements using sound waves with an iPhone. German developer Florian Student’s Acoustic Ruler Pro for iOS will measure distances up to 25 meters by clocking the time delay of emitted sound waves. You can use the app with either a pair of headphones or with another iPhone to measure the distance between the two handsets.
The Egg-Bot is an art robot designed by Bruce Shapiro that’s fun to watch as it draws intricate designs on eggs or any other round objects 3cm–10cm in diameter, including ornaments, golf balls, and light bulbs. You design the patterns in the free app Inkscape, and the bot draws them using fine-point Sharpies, engraving tools, […]
This is a fantastic introductory electronics kit that comes with your choice of large red or green LEDs and everything else needed (aside from a soldering iron, solder, and flush cutters) to make one electronic 6-sided die. (The manufacturer says: “The name Dice Kit sounds a great deal better than ‘Die Kit’, so we bent […]
I’ve been building OWI robot kits since the mid-1980s. Some have been good, a few not worth the box they came in. Every once in a while, OWI does a kit that’s great — their 3-in-1 All Terrain Robot (ATR) is one of these. This entertaining kit, suitable for kids 12 and up, lets you […]
What to do when you want to machine precise custom parts but don’t have room or funds for a professional CNC? Invest in a manual mill that can convert into a CNC. Considered a great tool for the price, the X2 Mini Mill is the kit builder’s top choice, and Probotix offers complete conversion kits (see […]
Most hobbyists neglect to get the good basic pieces you need to work on everyday machinery like counterfeit printing presses, getaway cars, and the trap doors on elevator ceilings. Instead, they get the $20 all-in-one checkout-line kit featuring tools made from an alloy of sawdust, soda cans, and rat droppings. RoadTech H3 tools absolutely don’t […]
This kit is amazingly cool and easy to use. POV (persistence of vision) displays show words or patterns that seem to float in mid-air; if you’ve ever seen one, you know what a great effect it is. A line of LEDs flashes the Y component of what you’re displaying, and you provide the X by […]
