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PCF8574 GPIO Extender - With Arduino and NodeMCU : 15 Steps - Instructables
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PCF8575 I2C 16 Bit Parallel IO Expander Module Compatible Arduino I2C to 16 Bit Parallel IO Expander Module PCF8575 Compatible Arduino [RKI-4475] - ₹260.00 : Robokits India, Easy to use, Versatile Robotics & DIY kits
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MCP23S17-E/SP I/O-Port Expander / 16bit / SPI Schnittstelle / S-DIL-28
sketch - Reading an MCP23S17 I/O expander port with the Arduino SPI library - Arduino Stack Exchange
Using Multiple IO Expander MCP23S08 Address Issue - Networking, Protocols, and Devices - Arduino Forum
Fragen zu Port Expander - Deutsch - Arduino Forum
Arduino Port Expanders: How to Instantly get More Pins
