3rd version

This project getting more interesting, my students had written some amazing applications using the previous version. In year 2010, I would consider this is an upgrade because it is better fabricated, compact and handy. This version is trying to achieve the same objectivse as the previous version, so I didn't remove any essential I/O devices such as color LCD, joystick, tactile switches, piezo buzzer and accelerometer. Comparing to previous version, I would say I had upgrade the I/O devices to much better one.