How to Use Port Expanders on the Arduino - Circuit Basics
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Adafruit MCP23017 I2C GPIO Expander Breakout [STEMMA QT / Qwiic] : ID 5346 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Novel Devices
Raspberry Pi HAT - 32 I/O Port Expander RPI-32IO-PE - MCP23017 - I2C
Amazon.com: CQRobot Ocean: MCP23017 IO Expansion Board Compatible with Raspberry Pi/Micro:bit/Arduino/STM32 Motherboard. I2C Interface, Expands 16 I/O Pins, Up to 8 Expansion Boards Can be Used Simultaneously. : Electronics
Add Digital I/O Pins to Raspberry Pi Hardware Using MCP23017 - MATLAB & Simulink Example
IO Expansion
Adding an MCP23017 16 port IO expander to Arduino or Esp8266 or Attiny85 or…….. – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
Raspberry Pi – MCP23017 bi-directional 16-Bit I/O Expander with I2C Bus | Roboter planen bauen programmieren
Python & CircuitPython | Using MCP23008 & MCP23017 with CircuitPython | Adafruit Learning System
Amazon.com: XICOOLEE MCP23017 I/O Expansion Board Module SG-IO-E017, 16 I/O Pins Supports for Raspberry Pi Series, Onboard 3-Digit DIP Switch, I2C Interface Compatible with 3.3V/5V Working Level : Electronics
5PCS/LOT MCP23017-IO Expansion Module Compatible With Raspberry Pi Micro-bit STM32 Arduino - AliExpress
Add Digital I/O Pins to Raspberry Pi Hardware Using MCP23017 - MATLAB & Simulink Example