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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
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Electronic Building Block Expansion Board, Sensor Expansion Board Electronic Components With Onboard Led Reset Button Fit For R3: Amazon.com: Industrial & Scientific
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ARDUINO Compatible Expansion Board for ARDUINO UNO R3 : Electronics - Amazon.com
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Amazon.com: Electronics-Salon RPi GPIO Expansion Extension Module Board, for Raspberry Pi 3/2 Pi Model B+ Zero. : Electronics
