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Annoy-A-Thing 2.0 Development

Annoy-A-Thing made by let_it_out_org.
After seeing some interest in developing a second iteration of the device, I thought it could be a good idea to start a forum thread for the development.

I think the device should ; Beep at random (or kind of) interval, Use a 555 or a 556 timer, and it should not be powered by a microcontroller.

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110100101108 years ago
the random timings can be reached by using 2 or more 555s at very low frequencies (1 pulse = about minute) and AND gate

more 555s = more random. 2 give something like
.............#.......###....########.....##.........#........#........................................#.......#......##...######..

by using third 555 you may make it give 2 different frequency beeps as well

obviously there is also the 555 that makes the actual KHZs for the beep sound

you may want to replace atleast some of the 555s with multivibrators (multivibrator = 2 transistors + 2 capacitors + few resistors. i think it eats more energy but atleast its more compact)

countable8 years ago
You wouldn't need a microcontroller to do something like this, however im not too sure about the random interval beeping. Using a 556 you could hook them up so that the signal seems less symetrical and more annoying. Also, if you could fit an op-amp circuit somewhere on there you could amplify the output signal and, by using a higher rated piezo or a buzzer, create a louder sound :)
yeah the 556 or two 555s won't make a random interval, but a seemingly random pattern of time between beeps. the trick will be how to time each timer correctly. also i think a version with a photocell implemented would be cool. i'm gonna try putting one together on the ol' bread board and i'll let you know how it turns out.
As in the photcells used in calculators? It would be a good idea, except it wouldn't be very practical. You see, the places that are normally quite hard to reach (a good place for something like this) are seldom well lit. If it was powered only by a photocell i doubt you'd get enough voltage to power a 556 and a piezo buzzer at the same time.
no, not a solar panel. a photocell detects light and varies resistance depending on how much light it detects.
yes, but if you hide it, say, in the drop ceiling tiles, it is dark up there, or if you put it in a drawer it won't sound until the drawer is open....etc.
well then don't hide the ones with the photocells there ;-)
I think the idea is that hidden will mean in the dark

If it is out where it can be seen, it will be easy to find ;-)
surely not ALL hiding spots get 0 light ALL the time. the point is to make it where it has to be completely dark for it to sound, for hiding where somoene would sleep. look under your desk or a table sometime when the lights are on...there is some light, isn't there?

not to mention light fixtures make great hiding spots.
Sure, I just was noting that there are more options if one puts a switch and timer on it, then just a CDS cell.
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