With the laminated design, the motherboard expands all the digital and analog interfaces of A in the form of servo wire sequence.The IIC interface, steering controller interface, Bluetooth module communication interface, SD card module communication interface, APC220 radio frequency module communication interface, ultrasonic sensor interface, 12864 liquid crystal serial and parallel interfaces are specially designed to make expansion easier to .The expansion board circuit is simplified, and common sensors can be easily connected.Made of high-quality materials, durable.Easy to operate and .Type: Sensor Expansion BoardColour:blueMaterial:PCBPackage Contents:1 x Expansion BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.