April Fools’ project teaches coworkers not to touch your stuff

april-fools-siren-box

Take one look at the sticker on top of this project box and it’s pretty clear you’re not supposed to flip the switch protected by the piece of red plastic. But if your coworkers are anything like [The Timmy’s] there’s at least a few who will stop by and just can’t keep their hands off. He built this to teach those sorts a lesson. Flip the switch and a very loud siren starts blaring. The thing is, the 107db alarm can’t be turned off by the switch, you must have the key for the switch on the side.

The siren is a self-contained unit that just needs a power source between 6V and 15V. This makes the project quite simple, the only part that [The Timmy] really needed to think about was how to build a mechanical SR Latch (set-reset). The solution is to use a mechanical relay. The toggle switch connects the normally open connector to the common terminal to enable the relay. The key switch breaks the relay’s connection to ground, allowing the magnetic switch to open again.

If you need some help understanding how the relay connections work we’ve embedded an unrelated video after the break.

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Fool me once… or as often as possible

There was a time when posting a fake story was fun for all involved. But in this age of constant trolling, it’s near impossible to pull it off with our savvy readership. Instead of letting you down with a really poorly advised how-to, we’re putting in a call to hear what you’ve got in your own bag of pranks. Consider this another holiday theme and tell us what you’re planning for April Fools’ Day.

As always, we’re looking for your own posts on the topic. We always want to give credit where it’s due so post your prank on your blog or other favorite corner of the interwebs and send us the link. Don’t have a place to put it? You can always start a thread in our project log forum, or check out this for additional spots to stake your claim.

In case you need some help coming up with something, we’ve got a few examples to get you thinking. You can go the route of fake video demonstrations like this Gmail gestures hoax, or the more recent Human BirdWings Project. But those require a lot of production time and a clever seed idea. Perhaps something really simple will go a long way with the roommates. We’re thinking soap covered in clear nail polish to prevent sudsing, or perhaps you want to reconfigure your router to render pages upside down. We can’t wait to see what you come up with!