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https://torte71.github.io/InsideSovolKlipperScreen/makerbase-soft-shutdown-files.html
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==== makerbase-soft-shutdown.service files ====

=== /usr/lib/systemd/system/makerbase-soft-shutdown.service ===
<code>
[Unit]
Description=makerbase-soft-shutdown
After=network.target
Wants=udev.target

[Install]
WantedBy=multi-user.target

[Service]
Type=oneshot
ExecStart=/root/soft_shutdown.sh
</code>

=== /root/soft_shutdown.sh ===
  * Sets up GPIO for the **supper** capacitor
  * does nothing more, because logic is commented out
<code>
#!/bin/bash


#enable the control of the supper capacitor,GPIO3_A4
if [ -d /sys/class/gpio/gpio100 ]
then
        echo out > /sys/class/gpio/gpio100/direction
        echo 0 > /sys/class/gpio/gpio100/value
else
        echo 100 > /sys/class/gpio/export
        echo out > /sys/class/gpio/gpio100/direction
        echo 0 > /sys/class/gpio/gpio100/value
fi

#power-off signal,gpio85(GPIO2_C5)
if [ -d /sys/class/gpio/gpio85 ]
then
        echo in > /sys/class/gpio/gpio85/direction
else
        echo 85 > /sys/class/gpio/export
        echo in > /sys/class/gpio/gpio85/direction
fi

while :
do
        #level=`cat /sys/class/gpio/gpio85/value` #Detect the power-off signal,gpio85(GPIO1_B2)
        #echo "gpio:$((level))"
        if [ "$level" = 1 ]
        then		
			sync
#           shutdown -h now

        fi
        sync
        sleep 2
done
</code>