The pentabug is a small microcontroller soldering project. It's especially suited for young hackers and beginners of all ages. Assembly requires no prior soldering skills and can be accomplished - with a little help for the tricky parts - by children old enough to savely hold a soldering iron (thats about 7 years and up).
At various events, e.g. Datenspuren 2012 and 2013, Chaos Communication Congress 2012+2013, and many more, several hundred kits have been successfully assembled with just a handfull of bugs needing 'special treatment' for e.g. a controller mounted the wrong way. Have a look at our slides in german from the accompanying presentation or watch this video of Frank and his sons beeing interviewed at our workshop table.
Img. 4: Version 2.1 schematics (high resolution image).