1、Solved the problem of wiring confusion when connecting multiple sensors 2、Lead all digital IO port and analog IO port, each IO port has a standard positive and negative power interface 3、Pull out the I2C interface on the motherboard to facilitate connection with I2C devices. 4、Increase DC power supply interface to ensure stable operation of equipment 5、This is a expansion board which has stable performance Features: 1. Solved the problem of wiring confusion when connecting multiple sensors 2. Lead all digital IO port and analog IO port, each IO port has a standard positive and negative power interface 3. Pull out the I2C interface on the motherboard to facilitate connection with I2C devices. 4. Increase DC power supply interface to ensure stable operation of equipment 5. This is a expansion board which has stable performance    Specification: Condition: 100% Brand new 14 I/O Pins (servo type with GND, power supply, signal) 8 Analog Pins with Power Supply Output and GND 6 PWM pin 1 Servo Power Input 5 I2C AREF Output Output: 3.3V   Package List: 1 x Expansion Board