Friday, April 05, 2019

Raspberry Pi shutdown using IR remote

Initially followed this instructable -

Had to make changes because of new version of Raspbian and lirc.

1. Added sensor as per this,
changing pinout as required by googling
2. Installation by
sudo apt-get update
sudo apt-get install lirc


3. Configuring kernel module was different from
The only thing we need to do is to uncomment out
dtoverlay=lirc-rpi
in /boot/config.txt

4. Configuration was slightly different from
(a) create /etc/lirc/hardware.conf and put in it
LOAD_MODULES=true
DRIVER="devinput"
DEVICE="/dev/lirc0"
(b) Placing the remote's configuration file was inside the directory /etc/lirc/lircd.conf.d
(c) starting the service was by /etc/init.d/lircd start

5. irexec configuration was different from
We needed to edit /etc/lirc/irexec.lircrc instead, since we want to shutdown and reboot, editing it to:
begin
    prog   = irexec
    button = KEY_1
    config = sudo shutdown -r now
end
begin
    prog   = irexec
    button = KEY_0
    config = sudo shutdown -h now
end

6. irrecord was a little tricky -
(Here also, instead of service lircd stop, we need to do /etc/init.d/lircd stop)

irrecord first wants you to press random keys. Then, you have to give the name of a key, press and hold it, then enter the next key's name when prompted, and so on for all the keys, and then only press ENTER to stop the process. And some keys are not recognized - maybe those should have been pressed during the first phase of random pressing.

7.  sudo /etc/init.d/lircd status reports error with duplicate remotes. We need to rename /etc/lircd/lircd.conf.d/devinput.lircd.conf to devinput.lircd.conf.dist
sudo mv devinput.lircd.conf devinput.lircd.conf.dist

8. sudo /etc/init.d/lircd status reports errors like
lircd-0.9.4c[364]: Error: Cannot glob /sys/class/rc/rc0/input[0-9]*/event[0-9]*
Then we need to edit /etc/lirc/lirc_options.conf, changing
device = devinput
to
device = default

9. sudo /etc/init.d/lircd status reports errors like
Error: could not get file information for /dev/lirc0
After a lot of searching, found on this page that this could be because the driver lirc-rpi has been replaced with a newer version called gpio-ir, so that the /boot/config.txt line has to be changed from
dtoverlay=lirc-rpi
to
dtoverlay=gpio-ir
Did that, and it worked.
This is on Raspberry Pi 2 running Raspbian 9 (Stretch) with kernel 4.19.23+, running lirc version 0.9.4c-9 while the other Pi, which worked with dtoverlay=lirc-rpi was running Raspbian 9 (Stretch) with kernel 4.14.98-v7+ and the same lirc version  0.9.4c-9.

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