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SparkFun I2C Expander Breakout - PCF8575 - BOB-08130 - SparkFun Electronics
PCF8575 I2C SMBus Erweiterung I/O 16-Bit MCU Expander Standard… – IoT powered by androegg.de
MCP2317 MCP23017 IO I2C 8-bit 16-bit MCU Erweiterung – IoT powered by androegg.de
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AK-PCF8575 – I2C 16-bit IO Expander Breakout | Artekit Labs
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arduino - Software implementation of I2C bus via port expander - Stack Overflow
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