The Evasive Beeping Thing is appropriately named, since it dutifully does exactly what its name implies: it sends out a 5-second, high-pitched beep every few minutes. The source is extremely difficult to locate because of the way that high frequencies can penetrate objects and trick our ears. You’ve probably encountered something similar in the real […]
Build a 4-camera surveillance system and watch from any web browser.
In this project we’re going to take inspiration from Len Keeler’s original Elastic String Bass. We’ll pick it up (no pun intended) and run with it, adding multiple strings for different tonal qualities, etch our own printed circuit board (PCB), and of course, demonstrate the instrument. First we will breadboard the basic version of this […]
Make a cute candy vending machine that only dispenses treats when you knock the secret rhythm on its front panel.
Add touch sensors which trigger audio tags. This helps visually impaired people find their way around a new device. Or you could make an educational toy to help Junior learn what things are called. Or you could add a warning to ‘keep off’ your stuff! Or…. Please note: I copied and modified the Android code […]
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!
