This is lap timer for Mini4wd what use iPhones camera.
[Usage]
1. Select the number of lanes to time.
2. Point lanes of the course with camera from above. And show mini4wd as large as possible.
3. Tap the [Im Ready!] button.
4. Run your mini4wd on the course.
5. Auto start to time when the mini4wd passes through the in front of camera.