1. AlphaBot2 control interface: for connecting sorts of controller adapter board

2. Ultrasonic module interface

3. Obstacle avoiding indicators

4. Omni-direction wheel

5. ST188: reflective infrared photoelectric sensor, for obstacle avoiding

6. ITR20001/T: reflective infrared photoelectric sensor, for line tracking

7. Potentiometer for adjusting obstacle avoiding range

8. TB6612FNG dual H-bridge motor driver

9. LM393 voltage comparator

10. N20 micro gear motor reduction rate 1:30, 6V/600RPM

11. Rubber wheels diameter 42mm, width 19mm

12. Power switch

13. Battery holder: supports 14500 batteries

14. WS2812B: true color RGB LEDs

15. Battery charging indicator 

16. 5V USB battery charging port

17. Power indicator