Feature request picoreplayer: Play state to GPIO

[mgraves]

I like the idea of tracking play state. I have several pi core players using HiFi Berry Pro XLR. These are connected to powered monitors around my home. The Pi is powered over Ethernet, so always powered on.

I'd like to use the play state of the Pi to trigger a remote controlled outlet to turn on the speakers. I already have the Amazon outlets that works with Alexa. So, an IFTTT action should be able to do this.

Sadly, I am not a developer. I'll need some help.

[DJanGo]

Sadly, I am not a developer. I'll need some help.

Make some script like amp_power.sh with something that powers the wifi-plug.

eg: (made for a Tasmota driven device without using mqtt "for this example" -in real life its using mqtt instead of curl)

#!/bin/bash
port=9090
server=lms.server.ip.address
muzzigbox=ma:ca:dd:re:ss from the used player
amp=IP.of.your.wifiswitch
now=$(date +%H:%M)
up=$(ps aux |grep squeezelite |grep -v grep|awk '{print $9}')
if [ ! "$now" == "$up"  ]
   then
   sleep 2
   status=$(printf "$muzzigbox mode ?\nexit\n" | nc $server $port | cut -d ' ' -
   if [ $status = play ]
         then
         curl http://$amp/cm?cmnd=Power%20ON
   else
         curl http://$amp/cm?cmnd=Power%20OFF
   fi
else
        echo detect startup
        printf "$muzzigbox power 0 \nexit\n"|nc $server $port
        curl http://$amp/cm?cmnd=Power%20OFF
fi

Use this script or similar for your -S option in squeezelite

Take a look at this Thread

The first script poweres the amp on / off if you press the powerbutton on the lms gui/ power the squeezelite player in any way.
The 2.nd script that should run each xx minutes as a cronjob "unpowers the squeezeliteplayer if its not playing anymore" and that power cycle starts the poweroff for your Amp.

[mgraves]

Take a look at this Thread

The first script poweres the amp on / off if you press the powerbutton on the lms gui/ power the squeezelite player in any way.
The 2.nd script that should run each xx minutes as a cronjob "unpowers the squeezeliteplayer if its not playing anymore" and that power cycle starts the poweroff for your Amp.

Thanks for the info!

I'm not concerned about powering off the plugin. That can be set up occur automatically on a scheduled basis. That is, turn it off every night at 11pm.

[sakos]

hi Axel,

Although not a good as an interrupt solution a simple loop inquiry of LMS may be OK.

The command "pcp mode" returns "play" or "stop". Do the inquiry every second and set relay appropriate. This only create a 1% load on CPU and little network traffic, not enough to cause problems.

regards
Greg

Do you happen to know why "pcp mode" does not distinguish "stop" and "power off" state? It returns "stop" in either state.

tc@Konyha:~$ pcp play
tc@Konyha:~$ pcp mode
play
tc@Konyha:~$ pcp pause
tc@Konyha:~$ pcp mode
pause
tc@Konyha:~$ pcp stop
tc@Konyha:~$ pcp mode
stop
tc@Konyha:~$ pcp play
tc@Konyha:~$ pcp mode
play
tc@Konyha:~$ pcp power off
tc@Konyha:~$ pcp mode
stop
tc@Konyha:~$

[Greg Erskine]

hi sakos,

Generally speaking the "pcp commands" are only a simple interface into LMS commands. They can only respond as LMS responds.

Having said that, reading the documentation we should get an "undefined" value. Maybe we have coded a default value of stop.

<playerid> mode ?

The "mode" command allows to query the player state and returns one of "play", "stop" or "pause". If the player is off, "mode ?" returned value is undefined.

Example:

Request: "04:20:00:12:23:45 mode ?<LF>"
Response: "04:20:00:12:23:45 mode stop<LF>"

I have added your post to the list of things todo.

regards
Greg

[Aki7]

Ok, my first (b)ash script, actually my first work on linux For newbees like me (working with Windows normaly):

- use MobaXTerm to ssh to your piCorePlayer, create a new file in /home/tc/ps2gpio.sh
- double click ps2gpio.sh in the MobaXTerm explorer view to edit the file
- copy and paste the script below, save and accept request with "all"
- In terminal Window - provided you will use GPIO4 set to 3V when squeezelite ist playing:

chmod +xX ps2gpio.sh
sudo ./ps2gpio.sh -g 4

If you think thats fine, you can put it to Autostart:
- Web browser to your picoreplayer
- Tweaks - User commands:
sudo /home/tc/ps2gpio.sh -g 4 -d

Sorry for the noisy explenations. Here is the script:
------------------------------------------------------------------------------------------

#!/bin/sh

BASE_GPIO_PATH=/sys/class/gpio


function Usage () {
  echo ""
  echo "PlayState to GPIO (ps2gpio) sets a GPIO when squeezelite is playing."
  echo "--------------------------------------------------------------------"
  echo "Usage: sudo $0 -g GPIO [-s n] [-d] [-h] [-v]"
  echo ""
  echo "-g : GPIO-number"
  echo "-s : Set value for \"play\" state: 0,1. Default=1 sets GPIO to 3V when playing"
  echo "-d : Daemonize: Start running in backgrund and exit"
  echo "-v : Verbose output when daemonized" 
  echo "-h : Shows this help"
  echo ""
  echo "Examples:"
  echo "---------"
  echo "  sudo $0 -g 27           : Sets GPIO27 to 3V when playing, stop running with Ctrl-c"  
  echo "  sudo $0 -g 4 -s 0 -d    : Sets GPIO4  to 0V when playing, running in background"
  echo "  sudo $0 -g 4 -s 1 -d -v : Sets GPIO4  to 3V when playing, running in background with status output"
  echo ""
exit 1
} # function Usage


function err () {
  echo "$1" >&2; Usage 
} # function err


# Parameter


# Defaults
Daemonize=false
PlayVal=1
Verbose=false


if [ ! $1 ]; then Usage; fi


while getopts g:s:dhv opt 
do 
  case $opt in
    g ) # Check for valid GPIO
        if [ "$OPTARG" -ge 2 ] && [ "$OPTARG" -le 27 ]; then
          myGPIO=$OPTARG
        else
          err "\"$OPTARG\" is not a valid GPIO, please use 2 .. 27"  
        fi # Check for valid GPIO
      ;;
    s ) # Check parameter for setting GPIO to 0 or 1 when playing
        if [ $OPTARG ]; then # Set GPIO to 0 or 1 when playing
          if [ "$OPTARG" -eq 0 ] || [ "$OPTARG" -eq 1 ]; then     
            PlayVal=$OPTARG 
          else
            err "\"$OPTARG\" is not a valid GPIO state, please use 0 or 1"
          fi
        else # no parameter
          PlayVal=1 # default
        fi # Check parameter for setting GPIO to 0 or 1 when playing
      ;;
    d ) Daemonize=true ;;
    v ) Verbose=true;;      
    h ) Usage;;
  esac
done
if [ ! $myGPIO ]; then err "Mandatory parameter -g \"GPIO\" is missing"; fi


echo "$0 -g $myGPIO -s $PlayVal -d $Daemonize -v $Verbose"


# Init
if [ ! -e $BASE_GPIO_PATH/gpio$myGPIO ]; then # Init GPIO
  echo "Export GPIO $myGPIO to userspace"
  echo "$myGPIO" > $BASE_GPIO_PATH/export
fi # Init GPIO


echo Set GPIO $myGPIO as an output
echo "out" > $BASE_GPIO_PATH/gpio$myGPIO/direction


# wait for squeeze to come online
wt=0
until pids=$(pidof squeezelite squeezelite-dsd)
do
  sleep 1; wt=$(($wt+1))
  echo "Waited $wt seconds for for squeezelite ..." 
  if [ "$wt" -ge 60 ]; then err "Waited too long for squeezelite"; fi
done


# read actual GPIO value - gives 0 ?
# oldGPIOval=`cat /sys/class/gpio/gpio$myGPIO/value`
# echo "oldGPIOval is $oldGPIOval"


function Loop () { 
  while true
  do  
    STATE=`(pcp mode)`
    if [ ! "$STATE" = "$OldState" ]; then # STATE change
      echo pcp State is $STATE
      if [ "$STATE" = "play" ]; then GPIOval=$PlayVal; else GPIOval=$((!$PlayVal)); fi # Set GPIO value
      if [ ! "$GPIOval" = "$oldGPIOval" ]; then
        echo Set GPIO $myGPIO to $GPIOval
        echo "$GPIOval" > $BASE_GPIO_PATH/gpio$myGPIO/value
        oldGPIOval=$GPIOval
      fi # GPIO val change
      OldState=$STATE 
    fi # STATE change
    sleep 0.5
  done # while true
} # function Loop


if $Daemonize; then # daemonize
  if $Verbose; then
    echo "Daemonizing with output." 
    Loop &
  else  
    echo "Daemonizing." 
    Loop > /dev/null 2>&1 &
  fi
else # run in foreground:
  Loop
fi 
exit 0

------------------------------------------------------------------------------------------
Not very well tested (On a fresh pcp 6.1 ok). Should work nevertheless.

have fun
Aki

[Aki7]

P.S. Dont forget to backup :-)

[Greg Erskine]

I wish my first shell script looked that good!

[Aki7]

Thanks Greg :-) Was a long way of learning from early Fortan (Punch cards) to Powershell nowadays.
I am motivated to start with C on piCorePlayer. Is there any helping starting point on piCore for newbees?
Aki

[paul-]

http://www.tinycorelinux.net/

There is also a book. http://www.tinycorelinux.net/book.html