Turn your computer's sound card into an oscilloscope to measure limited electrical signals, using Windows software and a simple circuit.
Chilled fog creates an appealingly eerie blanket on the ground. Most homemade fog chillers use a drink cooler and PVC tubing, but that design doesn’t keep the fog in the holding area long enough to chill it properly. Our fog chiller is very easy to build and does a great job of cooling the fog.
In this project, I show you how to make decorative tombstones from plain sheets of Styrofoam.
Halloween is a good time to invest in a new toothbrush, but before you throw out that old electric toothbrush, why not use it to give your Halloween decorations a little life by turning them into super lo-fi bristlebots?
Using an ultrasonic range sensor we can sense how far away objects are.
Make Halloween props on a table move without anything touching them.
Swivels and a weight give flexibility and stability to this contemporary design. Conventional mobiles are mostly made with hook-into-loop connections, which restrict movement. This mobile uses swivels, which allow the parts to rotate full circle, independent from each other.
What do you do with a bunch of small fans? You combine them into one big fan.
Build a light theremin into a musical noisemaker with Weekend Projects. This project combines a 555 timer, light-dependent resistor, LED, speaker, and some basic components into a battery-powered synth that's easy to assemble and fun to play.
As a young toddler, my son has zero interest in “baby” rattles but isn’t impressed by an Etch-A-Sketch or coloring yet.
This hack is easy and safe — use a 9V battery, vinegar, and salt to permanently etch designs on pots, pans, or any other metal surface you'd like to mark.
I modified a wireless doorbell system to turn on a light in addition to playing a tone.
