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Fitlet GPIO usage manual in Linux environment

1 byte added, 13:14, 19 June 2019
/* Usage example */
$ cat /sys/class/gpio/gpio89/value
## at this point cat command will print 0 or 1 depending if voltage measuring on P-1 (Brown) was 0V or 3.3V
$ echo 89 > /sys/class/gpio/unexport
423
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