Um Touchscreen und Flurlicht gleichzeitig via Bewebungsmelder an- und ausschalten zu können, ist der Touchscreen als Lampe in Home Assistant eingebunden.
Die Kommunikation findet dabei über SSH statt.
Über einen SSH Force Command wird ein Shell Script aufgerufen, welches den Touchscreen steuert.
# home assistant configuration.yml
shell_command:
dashdisplay_on: ssh -oConnectTimeout=3 -oStrictHostKeyChecking=no -q -i /config/ssh/dashdisplay.key pi@192.168.42.42 -- --on
dashdisplay_off: ssh -oConnectTimeout=3 -oStrictHostKeyChecking=no -q -i /config/ssh/dashdisplay.key pi@192.168.42.42 -- --off
dashdisplay_status: ssh -oConnectTimeout=3 -oStrictHostKeyChecking=no -q -i /config/ssh/dashdisplay.key pi@192.168.42.42 -- --displaystatus
# manually defined lights
light:
- platform: template
lights:
dashdisplay:
friendly_name: "Dashboard Display"
entity_id:
- binary_sensor.dashdisplay_status
turn_on:
service: shell_command.dashdisplay_on
turn_off:
service: shell_command.dashdisplay_off
value_template: >-
{{states('binary_sensor.dashdisplay_status')}}
# raspberry pi ~/.ssh/authorized_keys
command="/home/pi/display.sh",no-port-forwarding,no-X11-forwarding,no-pty ssh-rsa AAAAB3[....]
Das Script nutzt xset dpms um den Bildschirm an- und auszuschalten und
/sys/class/backlight/rpi_backlight/brightness um die Helligkeit des Displays zu
steuern.
#!/bin/bash
# /home/pi/display.sh
export DISPLAY=:0
TIMEOUT=120
BACKLIGHT="/sys/class/backlight/rpi_backlight/brightness"
# arguments
DOINIT=0
DOON=0
DOOFF=0
DODISPLAYSTATUS=0
DOSETBRIGHTNESS=-1
DOGETBRIGHTNESS=0
parseargs() {
while [[ $# -ge 1 ]]
do
key="$1"
case $key in
--init)
DOINIT=1
;;
--on)
DOON=1
;;
--off)
DOOFF=1
;;
--get-brightness)
DOGETBRIGHTNESS=1
;;
--set-brightness)
DOSETBRIGHTNESS="$2"
shift
;;
--displaystatus)
DODISPLAYSTATUS=1
;;
*)
# unknown option
;;
esac
shift # past argument or value
done
}
# script commands
parseargs $SSH_ORIGINAL_COMMAND
if [ "$DOINIT" == "1" ]; then
# disable screensaver
xset s off
# enable dpms
xset +dpms
# set timeout standby/suspend/off
xset dpms "$TIMEOUT" "$TIMEOUT" "$TIMEOUT"
fi
if [ "$DOON" == "1" ]; then
# wake screen
xset dpms force on
elif [ "$DOOFF" == "1" ]; then
# fall asleep
xset dpms force off
fi
if [ "$DODISPLAYSTATUS" == "1" ]; then
# get the current display status
xset q | grep "Monitor is" | sed 's/.*Monitor is //g' | tr '[:upper:]' '[:lower:]'
fi
if [ "$DOGETBRIGHTNESS" == "1" ]; then
# show the brightness
cat "$BACKLIGHT"
elif [ "$DOSETBRIGHTNESS" -ge 0 ] && [ "$DOSETBRIGHTNESS" -le 255 ]; then
# change the brightness
sudo sh -c "echo $DOSETBRIGHTNESS > $BACKLIGHT"
fi
