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03-blinking-leds.md

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Warm-up: On-board led blinking

Start Julia as root

sudo julia

Enter the following Julia commands:

write("/sys/class/leds/ACT/trigger","none")
write("/sys/class/leds/ACT/brightness","1")
write("/sys/class/leds/ACT/brightness","0")

Replace ACT by led0 for older version of Raspbery PI (drifter01 to drifter05). The first command, will take control over the green led. The second and third command switch it on and off.

Blinking leds:

filename = "/sys/class/leds/ACT/brightness";

while true;
   write(filename,"0");
   sleep(0.5);
   write(filename,"1");
   sleep(0.5);
end

Idea: What about implementing Morse code ?