About Arduino library for SPI based MCP23S17 16 channel port expander arduino spi input-output Readme MIT license ...

So you can connect up to 8 PCF8575 on one I2C bus, giving access to 8 x 16 = 128 IO lines. To maximize IO lines combine 8 x PCF8575 + 8 x PCF8574A giving 128 + 64 = 192 IO lines. Be aware that you ...

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