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This is an expansion board suitable for a series of cars with Arduino UNO R3 as the mainboard. The overall layout is reasonable and can be directly inserted with Arduino UNO R3.  I  can support the various modules required to build a balance car, such as ultrasonic module,  motor, WiFi module(designed by XiaoR GEEK), servo, sensor, etc.


1. Input voltage: Power interface DC7-15V

2. Button: RESET button

3. Serial port: Serial port 0(USB interface)

4. Car light interface: Interface voltage 5V(Headlight positive electrode connect car light interface, negative electrode connect GND)

5. LED indicator light: Power indicator light(No interface), Status indicator light(A0)

6. Servo driver: 6-ways servo driver(1-6)

7. Infrared infterface: 3-ways infrared interface, can be realize line following and object tracking.

8. Ultrasonic interface: Trig, Echo, VCC, GND

9. Display interface: 12864 display interface(Serial communication interface)

10. Motor interface: 2-ways motor servo, Output is battery voltage (7-15V)