I have just finished getting a serial port based encoder status LED script working under R5D1
I started with these instructions:
http://www.mythtv.org/wiki/index.php/Us ... ing_Status
Instead of using the power and HDD LEDs in the front of my case, i made up a panel with 2 extra LEDs in a space that used to house front USB ports.
I started with the second version of the script, which uses the http status page output to determine encoder status. In its original form it would only show recording activity, I wanted it to indicate LiveTV useage aswell so i modified the script as below. Also note I am using Com2 instead of Com1 (internal hearder - no messy cables outside the case) and have modified the script to suit.
/usr/bin/recstat.py
Code:
#!/usr/bin/python
import httplib
import serial,time
mythStatus = "localhost:6544"
encoder1 = "Encoder 1 "
encoder2 = "Encoder 2 "
recording = "is local on mythtv and is recording"
watching = "is local on mythtv and is watching"
#Open COM2
s = serial.Serial(1)
#Turn off all lights
s.setDTR(0)
s.setRTS(0)
while(True):
conn = httplib.HTTPConnection(mythStatus)
conn.request("GET", "/")
r1 = conn.getresponse()
results = r1.read()
if(results.find(encoder1+recording)!=-1):
s.setDTR(1)
elif (results.find(encoder1+watching) !=-1):
s.setDTR(1)
else:
s.setDTR(0)
if(results.find(encoder2+recording)!=-1):
s.setRTS(1)
elif (results.find(encoder2+watching) !=-1):
s.setRTS(1)
else:
s.setRTS(0)
time.sleep(1)
import httplib
import serial,time
mythStatus = "localhost:6544"
encoder1 = "Encoder 1 "
encoder2 = "Encoder 2 "
recording = "is local on mythtv and is recording"
watching = "is local on mythtv and is watching"
#Open COM2
s = serial.Serial(1)
#Turn off all lights
s.setDTR(0)
s.setRTS(0)
while(True):
conn = httplib.HTTPConnection(mythStatus)
conn.request("GET", "/")
r1 = conn.getresponse()
results = r1.read()
if(results.find(encoder1+recording)!=-1):
s.setDTR(1)
elif (results.find(encoder1+watching) !=-1):
s.setDTR(1)
else:
s.setDTR(0)
if(results.find(encoder2+recording)!=-1):
s.setRTS(1)
elif (results.find(encoder2+watching) !=-1):
s.setRTS(1)
else:
s.setRTS(0)
time.sleep(1)
I have also put together a startup script for KnoppMyth
/etc/init.d/recstat
Code:
#! /bin/sh
set -e
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DESC="serial port encoder status script"
NAME=recstat
DAEMON=/usr/bin/$NAME.py
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
# Gracefully exit if the package has been removed.
test -x $DAEMON || exit 0
#
# Function that starts the daemon/service.
#
d_start() {
start-stop-daemon --start --quiet --make-pidfile --pidfile $PIDFILE \
--exec $DAEMON &
}
#
# Function that stops the daemon/service.
#
d_stop() {
kill -9 `cat $PIDFILE`
}
case "$1" in
start)
echo -n "Starting $DESC: $NAME"
d_start
echo "."
;;
stop)
echo -n "Stopping $DESC: $NAME"
d_stop
echo "."
;;
restart|force-reload)
echo -n "Stopping $DESC: $NAME"
d_stop
sleep 1
echo "."
echo -n "Starting $DESC: $NAME"
d_start
echo "."
;;
*)
echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
exit 1
;;
esac
exit 0
set -e
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DESC="serial port encoder status script"
NAME=recstat
DAEMON=/usr/bin/$NAME.py
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
# Gracefully exit if the package has been removed.
test -x $DAEMON || exit 0
#
# Function that starts the daemon/service.
#
d_start() {
start-stop-daemon --start --quiet --make-pidfile --pidfile $PIDFILE \
--exec $DAEMON &
}
#
# Function that stops the daemon/service.
#
d_stop() {
kill -9 `cat $PIDFILE`
}
case "$1" in
start)
echo -n "Starting $DESC: $NAME"
d_start
echo "."
;;
stop)
echo -n "Stopping $DESC: $NAME"
d_stop
echo "."
;;
restart|force-reload)
echo -n "Stopping $DESC: $NAME"
d_stop
sleep 1
echo "."
echo -n "Starting $DESC: $NAME"
d_start
echo "."
;;
*)
echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
exit 1
;;
esac
exit 0
Installation is straight forward.
- As root, create /usr/bin/recstat.py and /etc/init.d/recstat as above
- Make any modifications you require to /usr/bin/recstat.py
- chmod +x both of these files.
- update-rc.d recstat defaults 90 will have the script load automatically at bootup (Thanks Cecil!)
- Reboot, or execute /etc/init.d/recstat start and your script will be running.
The original author of the script recommends adjusting the wait comand to 60 seconds, however i wanted mine more responsive and have lowered the wait to 1 second. The result on my P3 1GHz machine is 0.3% CPU useage once per second, with a 0.8% RAM footprint (512MB system RAM)
To avoid possible damage to your serial port, I recommend using a resistor in series with your LEDs. I am using 680ohm as i had some lying around, but anything around 1Kohm will be fine.
The finished product:
sorry for the dumb question