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I2C To I/O Port Module /MCP23017 Serial Port 16-Bit I/O Port Expander I2C IIC Serial Port - AliExpress
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MCP23017 - i2c 16 input/output port expander : ID 732 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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NEW I2C to IO port module/MCP23017 serial interface 16-bit I/O port expander I2C IIC serial portt - AliExpress
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Mcp23017 Serial Interface Module Iic I2c Spi Mcp23s17 Bidirectional 16-bit I/o Expander Pins 10mhz Serial Interface Module - Integrated Circuits - AliExpress
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Amazon.com: 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
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Adding an MCP23017 16 port IO expander to Arduino or Esp8266 or Attiny85 or…….. – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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