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WiringPi - Deprecated
WiringPi Library To Be Deprecated | Hackaday
Using the MCP23017 port expander with WiringPi2 to give you 16 new GPIO
How to use WiringPi2 for Python with pull-ups or pull-downs and PWM
How to setup the WiringPi on Raspbian OS guide | 14core.com
Understanding the Raspberry Pi GPIO Pinout