Serial Expansion HAT for Raspberry Pi _RPI_SD_SDCARD Power the board via either

Power the board via either a terminal block or servo style connector

and Arduino

It is ideal for environments that need something rugged or for people who simply don’t like plastic

Support OTG

Serial Expansion HAT for Raspberry Pi _RPI_SD_SDCARD Power the board via eitherThere's only a single UART port on the original Raspberry Pi, and once it's used for terminal debugging no other serial devices can be connected. Get around this limitation with the Serial Expansion HAT from Waveshare! This HAT gives you 2 channel UART and 8 programmable GPIO via I2C. Features Standard Raspberry Pi 40 pin GPIO header Onboard SC16IS752 expands 2 ch UART and 8 programmable GPIO through I2C (no extra pins required) Stackable up to 16