OrangePi 2G-IoT contains GPIOA, GPIOB, GPIOC and GPIOD. Each of group has 32 gpio. The type of GPIO is "Input", "Output" and "specify function" such as "I2C", "I2S" and so on. On board, OrangePi 2G-IOT IoT exports 40 pins as different function. User can utilize these, GPIO on different application scenarios. For example, User can configure the type of GPIO as "Input", and get current voltage from program. Another hand, User can configure GPIO as specify function, such as "Uart", "I2C" and "SPI".<br>