working module Raspberry Pi 4 and PIR?

[DariBer]

@hpgraphia

how does your config.js file look like for that module?
Would you be kind and show it?

[eracerhead]

I’ve done this by putting a relay directly in the backlight circuit. Connect the PIR to 5V and a gpio pin, and the relay to 5V and another GPIO pin. Use wiring pi and a simple bash script to get the state of the PIR and energize/de-energize the relay appropriately. It’s really simpler than it sounds and requires little to no knowledge of electronics.

You need to first install wiring-pi

sudo wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb

Here’t the script I run at startup to control it - works great.

#!/bin/bash
#
# Runs in the background to switch backlight on or off
# depending upon the state of the PIR motion sensor.   
#
# Usage: nohup backlightd [-r|-f] 0<&- &>/dev/null &
# 	-r log on loghost
#	-f log locally (default)
#
# Set as configured
PIR=18		# GPIO BCM number of PIR sensor
BACKL=15	# GPIO BCM number of backlight relay
OFF_DEL=60	# Minimum number of seconds to keep backlight om
ON_DEL=2	# Minimum number of seconds to keep backlight off
TIMO=3600	# Maximum number of seconds to wait for edge event
#
# Set for local policies
PRIO=local.info 		# if using rsyslog set priority
TAG=backlightd			# and tag to use on loghost
LOGFILE=/var/log/backlightd.log	# if using local syslog file

PATH=/bin:/usr/bin

# error handling
xit() { rlog "Line $1 Err $2 - $3  - exiting"; exit "$2"; }
die() { rlog "Exit signal received - exiting"; exit 0; }

# logging
case $1 in
	-r) rlog() { /usr/bin/logger -p "${PRIO}" -t "${TAG}" "$1"; } ;;
	 *) rlog() { /bin/echo "$1" >>"${LOGFILE}" ; } ;;
esac

cd / || xit $LINENO $? "Cannot cd to / ?!?"

reset(){
	# reset gpio pins, set initial conditions
	gpio edge "$PIR" both \
		|| xit $LINENO $? "Cannot set edge GPIO$PIR"
	gpio export "$BACKL" out \
		|| xit $LINENO $? "Cannot set export GPIO$BACKL"
	PIR_STATE=$(gpio -g read "$PIR") \
		|| xit $LINENO $? "Cannot read GPIO$PIR"
	gpio -g write "$BACKL" "$PIR_STATE" \
		|| xit $LINENO $? "Cannot write to GPIO$BACKL"
}

trap reset SIGUSR1
trap die   SIGTERM 

reset

while true
do
	timeout "$TIMO" gpio -g wfi "$PIR" both ; STAT=$?
	if [ "$STAT" -eq 124 ]; then
		rlog "gpio wfi timed out after ${TIMO}s - respawning" 
		STAT=0
	fi
	[ "$STAT" ] || xit $LINENO $STAT "gpio wfi terminated abnormally"
	PIR_STATE=$(gpio -g read "$PIR") \
		|| xit $LINENO $? "Cannot read GPIO$PIR"
	gpio -g write "$BACKL" "$PIR_STATE" \
		|| xit $LINENO $? "Cannot write GPIO$PIR"
	if [ "$PIR_STATE"  ]
		then sleep "$ON_DEL" 
		else sleep "$OFF_DEL"
	fi
done

[pugsly]

@DariBer Please see this document… this is how I use my PIR to turn off the screen when no one is in front of it.

https://www.thedigitalpictureframe.com/pir-motion-sensor-raspberry-pi-digital-picture-frame/