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OPEN-SMART PCF8575 IO Expander Module I2C to 16IO I2C to 16 bit IO expansion breakout board for Arduino - AliExpress
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Pcf8575 Io Expander Board Module I2c to 16io Iic I2c I/O Extension Shield Module - China Pcf8575 Module, Io Expander Module I | Made-in-China.com
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MCP23008 - i2c 8 input/output port expander : ID 593 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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