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pins located at: /sys/class/gpio
Initialize a gpio connection: echo <pin number> into “/sys/class/gpio/export” to create a gpio connection with pin <pin numebr>. echo <pin number> into “/sys/class/gpio/unexport” to remove an existing connection
Using a gpio connection: echo (“in”|“out”) into “/sys/class/gpio/gpio<pin number>/direction” to specify the mode of writing or reading. echo (“1”|“0”) into “/sys/class/gpio/gpio<pin number>/value” to turn (on|off) a port