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Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards. Onboard SC16IS752, expands 2-ch UART and 8 programmable GPIO through I2C, no extra pin required. It is stackable up to 16 this modules by setting the address jumper, that means up to 32-ch UART. Onboard multi LEDs for indicating the UART working status. Reserved I2C control pins, allows to work with other control boards