The Mystery Beeping Prank is a device hidden in a hollowed out book that beeps intermittently at different frequencies. I made this because I am surrounded by a lot of incredibly creative people who have a penchant for pranking one another, and this seemed like the most subtly annoying thing that I could think of. In fact, I imagine this will be outright maddening for all those not in on the joke. Hopefully these people will have a good sense of humor about it, and not be too permanently scarred by the experience. It is all in good fun, after all.

Step 1: Go Get Stuff

You will need:

(x1) Arduino micro (Radioshack #276-258)
(x1) 40 pin socket (Radioshack #276-1996)
(x1) LM386 audio amp (Radioshack #276-1731)
(x1) 220uF capacitor (Radioshack #272-1029)
(x1) speaker (Radioshack #273-092)
(x1) Prototype circuit board (Radioshack #276-150)
(x2) AA x 4 battery holders (Radioshack #270-391)
(x1) Book
(x1) Rubber cement
(x2) 12" x 9" x 1/4" wood blocks
<p>I keep getting this error...</p><p>BeepingBook_c.ino: In function 'void loop()':</p><p>BeepingBook_c:35: error: 'randomTime' cannot be used as a function</p><p>How can I fix this?</p>
<p>make sure there's no space in randomTime .</p>
<p>Very clever idea, definitely have some people in mind to use on already...! I was just curious, as I was going to head up to Radioshack later today, how much did all of the parts cost you in total? (Except for the book) Thanks!</p>
I want to build several of these and have them timed to make the sound at a slightly different time and a proximity sensor to silence when movement is nearby. The sound will &quot;move&quot; around the room away from the individual being annoyed.... Ha! Ha! Ha!
go check out think geek.com why they beat u there! its called( annoy a-tron )
Cool and nikcs
Love this project, starting making one last night to torment my brother. Since this is my first time posting I'll say this up front, I'm just trying to be helpful and not trying to offend anyone. I did notice some mistakes in the code, the &quot;for&quot; loop should read more like this &quot;for( int i ; i &lt; randomTime ; i++) { &quot; and for the last line &quot;randomTime = random(900,5400); &quot; I image that most people on here would be fine, just looking out for those that wouldn't be. Thanks again for the great post, I look forward to using it a great deal.
Im new to programming and having trouble. I copied and paste the sketch and verify. I keep getting &quot;I is not declared in this scope&quot;. Referencing for(i = 0, i &lt; randomTime, i++). <br>
Very cool project. I have been designing circuitry for this exact idea for a month or so, but I am using an entirely different approach. Since there are numerous ways to accomplish essentially the same thing, I'll briefly describe how I'm doing mine to give alternatives others may want to think about.<br> <br> Mine is going to consist of one (or two) coin cells for power, a piezo beeper, and a microcontroller. The idea behind mine is to make it about the size of a quarter so it will be easily hidden. The microcontroller can be either the PIC12F675 or a PIC10F200 because they are small, the former is a DIP8 and the latter is a DIP6 or surface-mount package SOT23-6. The code will be simple, it will keep the processor asleep until it is told to wake up, beep several times within a 30 minute timeframe, and then go back to sleep until the next night at around the same time. The aim is to have a random number of &quot;BLIP&quot; beeps (say, 6 or less) to occur at random times at night, with a random length of time between beeps, for around a half hour to avoid detection.<br> <br> Piezo sounders are very inexpensive, and its sound is very hard to pinpoint in a room, perfect for under a bed, above a picture frame, in a chandelier... almost anywhere will work because it's very small. The tiny microcontroller draws so little power while asleep that a power switch isn't needed, it will still last a year or more on a pair of coin batteries. Once I get it finished and field tested, I will eventually make an instructable for it.<br> <br> Peace!
Maybe make it more stealthy and maddening by using some kind of proximity sensor like an ultrasonic ranging device, so it'll stop beeping when the person approaches it. As soon as he gives up waiting for it to sound off again and walks away, start beeping anew. <br>Shades of crickets!
Once Elektor pulished some &quot;Electronic Nuisance&quot;, which was easier, but included a phototransistor in order to silence the disturber when the light was lit, and start it again after some five minutes of darkness. <br>hmmm.... <br>interesting added value.... :)
Excellent, other than the part where you destroyed a perfectly good book. grr
You're too funny! At it again! :-) <br>
Very nice!
If this ends up in my mailbox, Randy...
Oh this is just plain funny! I can think of so many people I'd love to do this to! Voted!
The person I really wanted to get with this discovered my plan. I just have to wait long enough for them to forget.
Wait a moment... When we moved from 2nd Street, I saw that book and I wanted to keep it, but I said &quot;Nah. I have enough books to read, and somebody will learn more reading it&quot;. But you destroyed it and you are using it for EVIL!!! <br> <br>Great project! :-)
Evil is a very subjective term.
Every villain thinks he is the hero of his story... LOL!
very funny! :-D

About This Instructable


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Bio: My name is Randy and I run the Instructables Design Studio. I'm also the author of the books 'Simple Bots,' and '62 Projects to ... More »
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