Here's a Make HOWTO for converting a set of wind-up novelty chattering teeth to an electronic tooth-brushing timer and toothbrush holder -- take your toothbrush out, start it running, and the teeth will chatter for two minutes (the recommended brushing time).
A switch is mounted under the toothbrush holder. When the toothbrush is lifted, the switch connects the battery to a timer circuit, which powers a servomotor. As the servo spins, it pushes a rod up and down. The rod opens and closes the teeth. When the timer is up the motor stops and the teeth go silent. When the toothbrush his returned to the holder the battery is disconnected.
We could have designed this timer using an Arduino or other microcontroller, but it’s so simple that all you really need is that trusty timer chip, the 555. Here’s how to make yours.
This handheld magnifying glass has two bright LEDs and is powered by 3 AAA cells (not included). The manufacturer says the magnification is 40X. I think it is less than that, but it is still plenty powerful for my needs – mainly, reading the markings on tiny electrical components and checking the layer fusion on […]
The curved bottom of the cup peeks through your drink as the level drops down, moving the “moon” from full to a fingernail-paring sliver. Of course, it works better if you drink something cloudy and white — it’s designed some cloudy Korean rice-wines, but would also work with Pernod and water, I’m thinking.
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Power up your gadgets in the most unexpected places with the extremely compact SolarJuice battery pack. SolarJuice charges up at home like your average battery pack, but also lets you add extra juice on-the-go using its built-in solar panel—so you’ll never be left unplugged from the digital world.4.5 Stars on Amazon!Simultaneously charges 2 devices at […]