RandomVideo/buzzer.sh

#!/bin/sh
# SPDX-License-Identifier: Unlicense

buzzergpio=0
strobegpio=2
swupgpio=23
swdowngpio=25

player="cvlc"
playerparam="--play-and-exit --quiet --no-osd -A alsa --alsa-audio-device=front:CARD=Device,DEV=0"
playerloop="--loop"

pgrepplayer="vlc"

pollingtime=0.05
buzzertimeout=2
strobeduration=1

volumetimeout=0.1
volumemax=100

playerfull="$(command -v $player) $playerparam"
cmdgpio="$(command -v gpio)"
cmdamixer="$(command -v amixer)"

$cmdgpio mode $buzzergpio in

$cmdgpio mode $strobegpio out
$cmdgpio write $strobegpio 1

$cmdgpio mode $swdowngpio in
$cmdgpio mode $swupgpio in

volumevalue=0
$cmdamixer -q -c 2 sset 'Speaker' $volumevalue%

while true; do

	buzzerstat="$($cmdgpio read $buzzergpio)"
	swupstat="$($cmdgpio read $swupgpio)"
	swdownstat="$($cmdgpio read $swdowngpio)"
	
	if [ "$buzzerstat" -eq 0 ] && [ "$swupstat" -eq 0 ]; then
		~/RandomVideo/RandomVideo.sh buzzer
		$cmdgpio write $strobegpio 0; sleep $strobeduration; $cmdgpio write $strobegpio 1 &
		sleep $buzzertimeout

	elif [ "$swupstat" -eq 1 ]; then

		if pgrep "$pgrepplayer" > /dev/null; then
               		pkill "$pgrepplayer"
		fi

		$playerfull $playerloop ~/RandomVideo/onair.mp4 &

		while [ "$swupstat" -eq 1 ]; do
			swupstat="$($cmdgpio read $swupgpio)"
			sleep $pollingtime
		done

               	pkill "$pgrepplayer"

	elif [ "$volumevalue" -eq 0 ] && [ "$swdownstat" -eq 1 ]; then
		
		while [ "$volumevalue" -lt "$volumemax" ] && [ "$buzzerstat" -eq 1 ]; do
			volumevalue=$((volumevalue + 1))
			$cmdamixer -q -c 2 sset 'Speaker' $volumevalue%
			buzzerstat="$($cmdgpio read $buzzergpio)"
			sleep $volumetimeout
		done
		
		sleep $((pollingtime * 2))

	elif [ "$volumevalue" -gt 0 ] && [ "$swdownstat" -eq 0 ]; then

		while [ "$volumevalue" -gt 0 ] && [ "$swdownstat" -eq 0 ]; do
			volumevalue=$((volumevalue -1))
			$cmdamixer -q -c 2 sset 'Speaker' $volumevalue%
			swdownstat="$($cmdgpio read $swdowngpio)"
			sleep $volumetimeout
		done

		sleep $((pollingtime * 2))

	elif [ "$buzzerstat" -eq 1 ] && [ "$swupstat" -eq 0 ]; then
		sleep $pollingtime

	fi

done