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Amazon.com: waveshare GPIO Expander for Raspberry Pi Pico,with 1x Raspberry Pi Standard 40PIN Header and 1x Pico 2×20PIN Header,for Connecting Raspberry Pi Hats and Pico Expansion Boards : Electronics
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DIN Rail Mount MCP23017 32 Channel GPIO Expander with I2C Interface for Arduino Raspberry Pi, 3.3V/5V Power|Demo Board Accessories| - AliExpress
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