Notepad

Apparemment seul la pin n°1 pourrait être utilisée comme PWM hardware. le soft gpio pourrait émuler le PWM en software mais ça doit être testé.

#activée en pwm gpio mode 1 pwm

#séquence & séquence inversée 0 ⇒ 1023 SEQ=`seq 0 10 1023` SEQR=`seq 0 10 1023 | tac`

for STEP in `echo $SEQ`; do

      gpio pwm 1 $STEP
      sleep 0.01

done

sleep 1

for STEP in `echo $SEQR`; do

      gpio pwm 1 $STEP
      sleep 0.01

done

#init all pins used into this script gpio mode 5 output gpio mode 6 output gpio mode 7 output

gpio mode 1 output

#while true, never stop while [ 1 ] do

      gpio write 6 1;

      nbTunnels=`./monitorTunnel.sh`;
      rNbTunnels=$?;

      nbUsers=`./monitorServer.sh`;
      rNbUsers=$?

      if [ "$rNbTunnels" -ne "0" ] || [ "$rNbUsers" -ne "0" ]; then
              nbUsers=0;
              nbTunnels=0;
              gpio write 7 1;
              gpio write 5 1;
              sleep 0.5;
              gpio write 7 0;
              gpio write 5 0;

      fi
      gpio write 6 0;

      #Ten times before a status' recheck
      for i in $(seq 1 10)
      do
              # if at least a user is connected
              if [ "$nbUsers" -gt "0" ]; then
                      # 1 fast flashing led (0.3 sec) for 1 user
                      for userId in $(seq 1 $nbUsers)
                      do
                              gpio write 7 1;
                              sleep 0.3;
                              gpio write 7 0;
                              sleep 0.3;
                      done
              fi

              # if no user found flash another led to tell 'hoho I'm still working'
              if [ "$nbUsers" -le "0" ]; then
                      gpio write 5 1;
              fi
              if [ "$nbTunnels" -gt "0" ]; then
                      gpio write 1 1;
              fi

              sleep 0.1;

              if [ "$nbUsers" -le "0" ]; then
                      gpio write 5 0;
              fi
              if [ "$nbTunnels" -gt "0" ]; then
                      gpio write 1 0;
              fi

              # wait 1 seconds (to make a clear distinction between data and 'waiting')
              sleep 1;
      done

done

#url to get informations on server (json format) URL='http://mc.helpcomputer.org:8123/up/world/john/'

#build status url (add a unix timestamp at the end) status=$URL`date +%s`;

wget=`wget –quiet –output-document=- “$status”`; rWget=$?;

if [ $rWget -ne 0 ]; then

      exit $rWget;

fi

#wget it over stdout and grep only interesting items (nb connected on server) nbUsers=`echo “$wget” | grep –only-matching '“currentcount”:[0-9]*' | cut -d':' -f2`;

echo $nbUsers; exit 0;

#search pids of auto ssh running instance PID_LIST=`pidof autossh`; #get all 'busy' connections NETSTAT=`netstat –tcp –program 2> /dev/null`; #should run as the same user or into root

NB_TUNNELS=0; for PID_PARENT in $PID_LIST do

      #get the pid of the cild (in this case the ssh process)
      PID=`pgrep -P $PID_PARENT`;
      rPID=$?;
      if [ $rPID -eq 0 ]; then
              #get the number of established found into call
              LINE=`echo "$NETSTAT" | grep $PID | grep 'ESTABLISHED' --count`;
              #add this number to nb tunnels
              NB_TUNNELS=$(($NB_TUNNELS + $LINE));
      fi

done

echo $NB_TUNNELS; exit 0;

En gros le script permet de faire un call wget sur un serveur et d'allumer 3 leds différentes selon le nombre d'utilisateurs connectés au serveur minecraft.

Et voici le schéma associé (fait en SVG) et utilisant des transistors de façon à utiliser un ampérage minimal auprès du raspberry :

• seulement 0.18 mA sont utilisés sur chaque port GPIO allumé
• pour envoyer +- 17 mA sur la LED (via l'alimentation 5v disponible sur le haut du schéma)

#!/bin/sh

#url to get informations on server (json format) URL='http://mc.helpcomputer.org:8123/up/world/john/'

#init all pins used into this script gpio mode 2 output gpio mode 3 output gpio mode 4 output

#while true, never stop while [ 1 ] do

      #build status url (add a unix timestamp at the end)
      status=$URL`date +%s`;
      gpio write 2 1;
      #wget it over stdout and grep only interesting items (nb connected on server)
      nbUsers=`wget --quiet --output-document=- "$status" | grep --only-matching '"currentcount":[0-9]*' | cut -d':' -f2`;
      gpio write 2 0;

      #Ten times before a status' recheck
      for i in $(seq 1 10)
      do

              # if at least a user is connected
              if [ $nbUsers -ne 0 ]
              then
                      # 1 fast flashing led (0.3 sec) for 1 user
                      for userId in $(seq 1 $nbUsers)
                      do
                              gpio write 3 1;
                              sleep 0.3;
                              gpio write 3 0;
                              sleep 0.3;
                      done
              else
                      # if no user found flash another led to tell 'hoho I'm still working'
                      gpio write 4 1;
                      sleep 0.1;
                      gpio write 4 0;
              fi

              # wait 3 seconds (to make a clear distinction between data and 'waiting')
              sleep 3;
      done

done