The document discusses the development of a low-cost portable device called vBox that measures acceleration time and top speed of vehicles. It aims to provide a simple and clear user interface that allows switching between speed units. Lessons learned include starting early, testing APIs early, and that building a good GUI and accurately measuring speed using an accelerometer are challenging. Moving forward, the goal is to finish the vBox and potentially develop a social network app called Friend Organizer.

1. EECS 441 vBox vBox Wang Hongyu Yang Fengming Zhang Bing

2. Problem Amateur racer could hardly find out 0-60 time Find out the acceleration time. Original v-box is US$499. Too expensive. Original v-box is limited to only single function. Currently available devices are not portable.

3. User Interface Simple and clear Customized speed Switch between units

4. Demo A demo is worth 1000 words ... A demo is worth 1000 words ...

5. Three lessons learned Start early ! Test APIs early Build a good GUI is not trivial Accelerometer is very sensitive 100 Hz at maximum Measuring speed accurately is hard

6. Moving forward Finish up vBox Another idea in mind : Social Network Related: Friend Organizer