Overview There is only 1-ch UART port on the original Raspberry Pi, once it is used for terminal debugging, no more other serial device is allowed. What a poor situation. Now you have 2-ch extra UART, plus 8 programmable GPIOs, just bring this Serial Expansion HAT. Features Standard Raspberry Pi 40PIN GPIO extension header, compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B and later versions 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 Comes with development resources and manual (examples in C and python) Specifications Operating voltage: 3.3V Expansion chip: SC16IS752 Control interface: I2C Dimension: 65mm x 30mm Mounting hole size: 3.0mm Package Contains : Serial Expansion HAT x1 RPi screws pack (2pcs) x1 PH2.0 6PIN wire x2 For more details you may need to know, pls firstly send me message via , I will then send attached link including User Guide for you, thank you for patience.:)

Onboard SC16IS752, expands 2-ch UART and 8 programmable GPIO through I2C, no extra pin required. Standard Raspberry Pi 40PIN GPIO extension header, compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B and later versions. There is only 1-ch UART port on the original Raspberry Pi, once it is used for terminal debugging, no more other serial device is allowed. What a poor situation. Now you have 2-ch extra UART, plus 8 programmable GPIOs, just bring this Serial Expansion HAT. Serial Expansion HAT for Raspberry Pi, I2C Interface, Provides 2-ch UART and 8 GPIOs. Part Number: Serial Expansion HAT.