Adafruit MCP23017 I2C GPIO Expander Breakout [STEMMA QT / Qwiic] : ID 5346 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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
four mcp23017 on a raspberry pi zero is possible? - Raspberry Pi Forums
Adafruit MCP23017 I2C GPIO Expander Breakout (STEMMA QT / Qwiic) | The Pi Hut
How to connect the MCP23017 GPIO Expander to an Arduino and Raspberry Pi - YouTube
IO Expansion
How to use the MCP23017 Port Expander with the Raspberry Pi | The Pi Hut
Raspberry Pi HAT - 32 I/O Port Expander RPI-32IO-PE - MCP23017 - I2C
Adding an MCP23017 16 port IO expander to Arduino or Esp8266 or Attiny85 or…….. – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
Zynthian dose not recognise mcp23017 - Building Zynthian - Zynthian Discourse
5PCS/LOT MCP23017-IO Expansion Module Compatible With Raspberry Pi Micro-bit STM32 Arduino - AliExpress
Novel Devices
Coolwell Waveshare MCP23017 IO Expansion Board I2C Interface Expands 16 I/O Pins Stack to 8 pcs for Raspberry Pi Raspberry Pi 4B+ 4B 3B+ 3B 2B+ Zero W WH 2 W Micro:bit Ardui STM32 : Electronics - Amazon.com
MCP23017 Port Expanders | 8BitCoder
Add Digital I/O Pins to Raspberry Pi Hardware Using MCP23017 - MATLAB & Simulink Example
MCP23017 HAT - 32 Channel I/O Expansion HAT - PiShop.us
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