A Japanese blog now has pretty complete details of a half size, stepper-driven micromouse. Over a period of only a few weeks, there have been posts covering the mechanical design, software and circuit details of a complete mouse and several videos of it performing in a test maze.As ever, identifying the owner/author of a Japanese blog can be a bit difficult. His nickname on the profile page is k_com and the blog uses the name CPU4EDU.UPDATE: The site owner (Kiyoteru Hayama) has put his personal details in a comment below.You can find his home page here:http://plaza.rakuten.co.jp/CPU4Edu/On a single page are the mechanical details and a number of photographs of the mouse during construction as well as a full schematic:http://plaza.rakuten.co.jp/CPU4Edu/20005And on this page is a link to the source code (only about 1000 lines or so)http://plaza.rakuten.co.jp/CPU4Edu/20009Videos are readily found on YouTube:http://www.youtube.com/user/cpu4eduSo, budding mouse builders now have another example to follow. This is a simple design and has everything you might need to build a near replica. The processor is an H8. These seem popular in Japan and are readily available on handy plug-in modules. However, the code is all in Ca nd the hardware dependencies could easily be ported to another processor. Only one timer is used and a number of I/O ports along with a few ADC channels.