Ask MAKE: Debouncing a switch
Switch bounce is one of those rare electronic effects that is actually a caused by a mechanical shortcoming The issue is in the way the switch works.
Switch bounce is one of those rare electronic effects that is actually a caused by a mechanical shortcoming The issue is in the way the switch works.
An opto-coupler is a device that can be used to electrically isolate two circuits, so that a voltage spike or other problem on one side will not destroy the circuit on the other side.
I would like to know what is the best way to get started in this area of physical, interactive microcontrollers. Can some one point me in the right direction?
We recently had a question from a reader about this prop. “Connie” wrote in wanting to know how to replicate the mechanism that, in the movie, is used to unlock The Book’s cover. Never having seen The Mummy, I went into research mode and enqueued it from Netflix. Then I watched it. Big mistake.
But, you know, to each his or her own. And “The Book of the Dead,” with its ornate clasps and intricate star-shaped key, is admittedly an awesome prop. The scene Connie is referring to, I believe, occurs at almost exactly one hour into the “Deluxe Edition” cut of the film, and shows the intrepid but remarkably foolish archeologists inserting the aforementioned star-shaped key into a correspondingly star-shaped opening in the book’s cover, turning it, and thereby releasing the spring-loaded cover clasps and, with them, all manner of unpleasant whatnot.
So I started Googling around, looking for dweebs enthusiasts that might have already built such a thing. And while I did not find any working mechanical replicas of the prop, I did discover the remarkably beautiful static replica shown in the photo at the top of this post by Jeff Stelter of Stelter Creative Woodworks.
Ask MAKE is a weekly column where we answer reader questions, like yours. Write them in to mattm@makezine.comor drop us a line on Twitter. We can’t wait to tackle your conundrums! Phil writes in with an interesting question: When I found out about this neat Ubuntu tablet that is powered by AA batteries, I started […]
We occasionally receive really cool projects that we would like to publish, however they just don’t have quite enough information for us to figure them out. So, here are some tips about documenting your projects in a way that makes them accessible.
A few weeks ago, we looked at why dimmer switches cause incandescent light bulbs to buzz. We subsequently received a number of questions about why flourescent bulbs vibrate.