pi64 thermal regulation

[phbillet]

Hereafter a small script for thermal regulation (usable with this electronic scheme https://hackernoon.com/how-to-control-a-fan-to-cool-the-cpu-of-your-raspberrypi-3313b6e7f92c) : #!/bin/bash VALUE=45000 if [ ! -f "/sys/class/gpio/gpio18/value" ];then chmod a+w /sys/class/gpio/export; echo "18" > /sys/class/gpio/export; chmod a+w /sys/class/gpio/gpio18/direction; chmod a+w /sys/class/gpio/gpio18/value; echo "out" > /sys/class/gpio/gpio18/direction; fi TEMP="cat /sys/class/thermal/thermal_zone0/temp" if [ $TEMP -ge $VALUE ] then echo "1" >/sys/class/gpio/gpio18/value elif [ $TEMP -le $VALUE ] then echo "0" >/sys/class/gpio/gpio18/value fi

Then using sudo crontab (with the entry * * * * * /usr/bin/ctrl-fan.sh ) it starts (or stops) the fans depending on the threshold (here 45°C).

As I got some problems with privileges, I had some chmod's : not really nice, but work. Do you know why ?

You should add the package zram (from ubuntu to your distribution)...

Your distribution works so nicely !

[bamarni]

@phbillet : as which user your cron is running? If it's not root I think it's normal that you don't have write access.

[phbillet]

When I tested the script, I used sudo, and the crontab is also root crontab (because I used sudo crontab -e). I used this trick, and it works fine but it is not really academic ;-)