>> http://www.thinkgeek.com/gadgets/electronic/79be/
>
> That toy is $25.  Who here thinks they can come up with the cheapest
> work-alike?

Olin.
You can use a PIC10F... and not much else.
Basically a battery and beeper and any processor will do it.

Extra points is given for the version with a light sensor that only 
sounds in the dark. Turn on the light and it stops. Make it sound like 
a cricket and ...

You can buy them.

Double extra point that uses the beeper as a mike to listen for 
approaching searchers and go silent.

Several of these could use phased array techniques to help hide their 
locations :-). May take a bit of coordination though.

I once started but never did complete a similar device that was going 
to go on an office mates phone line, to be hidden in the ceiling 
tiles. That would have been fun to find :-). We worked for the 
national and sole NZ Telecoms operator at the time.



        Russell


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