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Amazon.com: MCP23017 IO Expansion Board I2C Interface 5V/3.3V Voltage Expands 16 I/O Pins 8pcs of Boards can Stack to Use at The Same Time up to 128 I/O Pins Allows Multi I2C
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NET Core and GPIO on the Raspberry PI - LEDs and GPIO | CustomMayd - Thoughts on coding and developer training
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Amazon.com: Waveshare MCP23017 IO Expansion Board I2C Interface Expands 2 Signal Pins as 16 I/O Pins Compatible with 3.3V and 5V Levels: Computers & Accessories
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