Ryan Schulze

Mythtv and IR Blaster

January 24, 2010March 12, 2011Ryan2 Commentsbash, ir blaster, MythTV

We use a set-top-box as the video source for mythtv. And while this works perfectly fine, we have to manually make sure the right channel is set for what mythtv wants to record. This can turn out to being a pain at time, especially when multiple things are planned to be recorded on different channels. So I went and ordered a IR transmitter from irblaster.info to give mythtv the possibility to change channels itself.

Since a bunch of the infos I found online were a bit out dated, here are a few tips for anyone using current versions of the software (I’ve got mythtv-backend 0.22 and lirc 0.8.4a running on a mythbuntu based system when I wrote this)

Hardware is easy to set up, just plug it into a free serial port.
1st we will head over to http://lirc.sourceforge.net/remotes/ and grab the file for our reciever set-top-box if we don’t already have them.
Then go edit /etc/lirc/hardware.conf and add the transmitter settings, these were mine:
TRANSMITTER="Skymaster_XL10" TRANSMITTER_MODULES="lirc_dev lirc_serial" TRANSMITTER_DRIVER="" TRANSMITTER_DEVICE="/dev/lirc1" TRANSMITTER_LIRCD_CONF="skymaster/XL10" TRANSMITTER_LIRCD_ARGS=""
now include the reciever settings to /etc/lirc/lircd.conf
I edited my /etc/init.d/lirc to execute the following line before starting the daemon (was needed to ensure the lirc_serial module can be loaded):
/bin/setserial /dev/ttyS0 uart none
Restart lircd and you can then start testing if transmitting codes work with irsend works. here is a little wrapper script I wrote around irsend for mythtv to use. You may have to twiddle around with the sleeps and change the $Remote to your reciever. If the sleeps are too long (-> the script takes to long to finish switching channels), then mythtv will timeout and not display live tv.

#!/bin/bash

Remote="Skymaster_XL10"

send="irsend -d /dev/lircd1 SEND_ONCE"

if [[ "$(echo $1|grep -c "^[0-9]")" = "0" ]]
then # non-numeric command
$send $Remote $1
else # numeric
for digit in $(echo $1 | sed -e 's/./&amp; /g'); do
$send $Remote $digit
sleep 1.5
done
fi
sleep 2

#!/bin/bash

Remote="Skymaster_XL10"

send="irsend -d /dev/lircd1 SEND_ONCE"

if [[ "$(echo $1|grep -c "^[0-9]")" = "0" ]]

then # non-numeric command

$send $Remote $1

else # numeric

for digit in $(echo $1 | sed -e 's/./& /g'); do

$send $Remote $digit

sleep 1.5

done

sleep 2

If everything is working fine, then go ahead and tell mythtv to use the script to change channels. This is done in the tuner card setup of mythtv-backend (mythtv-setup).

Snow

January 9, 2010May 19, 2011Ryanphotography, snow

We went for a walk through the snow and some sledding today, here are the pics i shot ….
[album=7,compact]

Farmville

November 25, 2009September 27, 2014Ryan1 CommentAutohotkey, Farmville, Script

Farmvill can be a fun way to pass some time, but if your fields get to be a bit big clicking on every single field can get to be a bit tiresome. I found this autohotkey script in the depths of the internet. It simplifies the process greatly 😉

!^c::
GoSub GetFarmSq
GoSub Getfirstsq

i=1

SetMouseDelay, 0

cycle := farmy/2
newx=%startx%
newy=%starty%
loop, %cycle%
{
Click %newx%,%newy%
Loop, %farmx%
{
newx+=25
newy-=12
Click %newx%,%newy%
}
newx+=25
newy+=12
Click %newx%,%newy%
Loop, %farmx%
{
newx-=25
newy+=12
Click %newx%,%newy%
}
newx+=25
newy+=12
}

return

GoSub Getfirstsq

GetFarmsq:
Inputbox, farmy, Hi, Enter the number of fields to the right to click on,,200,150,,,,,6
if ErrorLevel
GoSub Esc
Inputbox, farmx, Hi, Enter the number of fields upwards to click on,,200,150,,,,,6
if ErrorLevel
GoSub Esc
farmx--
return

Getfirstsq:
Msgbox, Click on the leftmost field to start with ("9 O'clock" position).
KeyWait, LButton, D
KeyWait, LButton, D
MouseGetPos, startx, starty
return

Esc:
!^x::reload
Return

!^c::

GoSub GetFarmSq

GoSub Getfirstsq

i=1

SetMouseDelay, 0

cycle := farmy/2

newx=%startx%

newy=%starty%

loop, %cycle%

{

Click %newx%,%newy%

Loop, %farmx%

{

newx+=25

newy-=12

Click %newx%,%newy%

}

newx+=25

newy+=12

Click %newx%,%newy%

Loop, %farmx%

{

newx-=25

newy+=12

Click %newx%,%newy%

}

newx+=25

newy+=12

}

return

GoSub Getfirstsq

GetFarmsq:

Inputbox, farmy, Hi, Enter the number of fields to the right to click on,,200,150,,,,,6

if ErrorLevel

GoSub Esc

Inputbox, farmx, Hi, Enter the number of fields upwards to click on,,200,150,,,,,6

if ErrorLevel

GoSub Esc

farmx--

return

Getfirstsq:

Msgbox, Click on the leftmost field to start with ("9 O'clock" position).

KeyWait, LButton, D

MouseGetPos, startx, starty

return

Esc:

!^x::reload

Return

bash scripting … switching into directory of the script

November 23, 2009March 12, 2011Ryanbash, readlink, snippet

Sometimes it is useful to switch into the directory of the script e.g. when we need to call or include further files and don’t want to go through the hassle of searching for the script in the file system. Especially when symlinks are involved everything get a bit more interesting. This little snippet switches into the directory of the script, using readlink to dereference symlinks if the script is called via a symlink.

## a small snippet to switch into script directory
SCRIPTDIR=${0}
if [[ -L ${SCRIPTDIR} ]]
then
# dereference the symlink
SCRIPTDIR="$(readlink -e ${0})"
fi
# chop off the scriptname and switch into the directory
cd ${SCRIPTDIR%/*}

## a small snippet to switch into script directory

SCRIPTDIR=${0}

if [[ -L ${SCRIPTDIR} ]]

then

# dereference the symlink

SCRIPTDIR="$(readlink -e ${0})"

# chop off the scriptname and switch into the directory

cd ${SCRIPTDIR%/*}

Bash scripting, traps and sleep

October 9, 2009March 12, 2011Ryan1 Commentbackground, bash, kill, trap

Today I ran into any old problem: you have a script that should do something when it recieves a signal (e.g. if someone sends it USR1 it should write to a log/syslog), but the script uses a long sleep because it normally only checks/calculates stuff every x min. If you send it a kill -USR1 $pid it will normally execute the trap AFTER the sleep is done, not so great. I figured of the following solution today: put the sleep in a while loop that checks if the full time was slept, and inside the loop a sleep that sleeps the X seconds remaing in the background followed by a wait.

If the script now recieves a USR1 it can kill the wait, execute the trap and will continue the remaining sleep on the next iteration of the loop.

#!/bin/bash

initialize() {
set -o nounset
trap cleanup INT TERM EXIT
trap print_foo USR1
}

cleanup() {
exit 0
}

print_foo() {
echo "foo"
}

initialize

# sleep 1 min
SLEEPTILL=$(date '+%s' --date="+1 min")

while [[ $(date '+%s') -lt ${SLEEPTILL} ]]
do
sleep $(bc &lt;&lt;&lt; "${SLEEPTILL} - $(date '+%s')") &amp;
BACKGROUND=$!
wait $BACKGROUND
done

#!/bin/bash

initialize() {

set -o nounset

trap cleanup INT TERM EXIT

trap print_foo USR1

}

cleanup() {

exit 0

}

print_foo() {

echo "foo"

}

initialize

# sleep 1 min

SLEEPTILL=$(date '+%s' --date="+1 min")

while [[ $(date '+%s') -lt ${SLEEPTILL} ]]

sleep $(bc <<< "${SLEEPTILL} - $(date '+%s')") &

BACKGROUND=$!

wait $BACKGROUND

done