===== Utilisation du PWM  =====

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



===== Script général utilisant les 2 autres scripts  =====


#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



===== Monitorage de serveur minecraft  =====


#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;



===== Monitorage de tunnel  =====



#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;



===== Contrôle en bash et via wiring pi des ports GPIO (vieille version cfr ci dessus)  =====


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)

{{:electronique:led_gpio.svg|}}


#!/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