There is only a 1-ch UART port on the original Raspberry Pi, once it is used for terminal debugging, no 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.
The SC16IS752 is an I2C-bus/SPI bus interface to a dual-channel high-performance UART. It also provides the application with 8 additional programmable I/O pins. This module uses an I2C interface by default, and its device address is hardware configurable by A0 and A1.
Package Includes:
1 x Serial Expansion HAT
1 x RPi screws pack (2pcs)
1 x PH2.0 6PIN wire
Raspberry Pi GPIO Expansion Board One to Three
Official Raspberry Pi Global Shutter Camera
Raspberry PI IQaudio DAC Pro
Waveshare USB HUB HAT (B) for Raspberry Pi Series with 4x USB 2.0 Ports 










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