Annoying Assholes - ungut.at
I actually didn't know something like this existed already until I looked it up. Although I could have expected it to, in light of human mischief. I still didn't find a version I liked.
This one for example, is just a battery taped to a piezo speaker, which means it's active all the time and will be easily found. A friend of mine apperently also built something similar, although it is not designed for "mass"-production. He even used an Attiny13 and wrote all the code directly in C, instead of using something like the Arduino IDE. The Annoy-O-Bug is a little different, it has a small mircocontroller and an LED. It uses the Attiny85. The undesired side-effect: One of theses costs almost 5 Euros.
I knew I had to make it more affordable, so I consulted with a few of my electronics-affine friends. Our first instinct was to use two timers, one for the long intervals between beeps and one for the PWM for the piezo speaker. Upon looking it up, we found that an Attiny25 was actually cheaper, so we went for that.
For the next step we had those made and bought all the other parts. Being multiple people, we were able to parallelize the work. Splitting it into: Flashing the Chips using a POMONA-Clip, applying the solder paste, baking the PCBs and hand soldering the components. Thanks for your help, Mumpitz (:
