Using GPIO pins

[mcerveny]

Oh, no. Not this way. "#" indicate interactive root prompt (but comment in scripts). Your way:

Code:

rock64@rockpro64:~/gpio$ sudo bash
root@rockpro64:~# cd /sys/class/gpio
root@rockpro64:/sys/class/gpio# echo 54 > export
root@rockpro64:/sys/class/gpio# ls gpio54
active_low  device  direction  edge  power  subsystem  uevent  value
root@rockpro64:/sys/class/gpio# echo out > gpio54/direction
root@rockpro64:/sys/class/gpio# echo 0 > gpio54/value
root@rockpro64:/sys/class/gpio# echo 1 > gpio54/value
...

This was write "interactively" so you can check pin with voltmeter or simple low power LED diode (something like this but diode on pin 11 on pinheader (marked as BCM_cpu_pin_17 in demo link, demo link uses BCM_cpu_pin_18 (pin 12 on pinheader))) ... some learning path before you.