Features: 1It adopts laminated style, which leads to all the I/O ports for R3 motherboard, and has two onboard LEDs, a reset button and an external power interface. 2Specially designed port, it is very convenient to use, powerful expansion ability, compatibility and usability, stable performance and high reliability. 3Designed for R3 control board and compatible control board, suitable for beginners, do not have to headache for complicated and complicated circuit wiring. 4The circuit is simplified, and common sensors can be easily connected. A sensor requires a universal 3P sensor cable (no distinction between digital and analog cables). 5After completing the circuit connection, write the corresponding program to download to the controller to read the sensor data, or receive the wireless module to return the data, and after the arithmetic processing, the interactive work is easily completed. Condition: 100% Brand New Item Type: Expansion Board Material: Printed Circuit Board Pin Description: I/O Port: 14 digital pins, including 6 PWM function pins and 8 analog pins Onboard LED, reset button and external power port: Red LED - power indicator Yellow LED - connected to D13 pin RESET button 5V external power port Specially set up the following interfaces: IIC interface Servo controller interface For Bluetooth module communication interface Memory card module communication interface APC220 wireless RF module communication interface Ultrasonic sensor interface 12864 LCD serial and parallel interface Fitment: Fit for R3 control board Package Included: 1 x Expansion Board