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PCF8575 I/O Expander : Pinout, Schematic and Datasheet
Pcf8575 i/o expander : pinout, schematic and datasheet
Xreef/pcf8575 library: pcf8575, library for arduino, raspberry pi…
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Pcf8575 i/o expander : pinout, schematic and datasheet
Pcf8574 does work adress a0 .
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