MCP23S17 Bidirektionale 16 Bit I/O Expander SPI Serial Interface Schild Modul I2C Interface 10 MHz Max Hohe geschwindigkeit Bord|board module|board boardc c - AliExpress
Port Expander Library
IO-Port Expanders Offer Flexibility in MCU Designs | DigiKey
MCP23S17 Bidirektionale 16 Bit I/O Expander SPI Serial Interface Schild Modul I2C Interface 10 MHz Max Hohe geschwindigkeit Bord|board module|board boardc c - AliExpress
32-Kanal Digital Expansion HAT für Raspberry Pi - RobotShop
MCP23S17 I/O expander as SPI CS pin selector issue - LEDs and Multiplexing - Arduino Forum