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Onboard SC16IS752, expands 2-ch UART and 8 programmable GPIO through I2C, no extra pin required Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards 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 Download resources: www.waveshare.com/wiki/Serial_Expansion_HAT