The Weather Station Lives Again

December 21, 2019 9:56 am

Over Thanksgiving a big storm blew through. We were out of town but I noted that my weather station reported a bunch of rain and then stopped transmitting. When we got home, I climbed up on the roof to investigate. I replaced the batteries (which hadn't been changed in 2.5 years) and the station started reporting again.

This guy hung out with me for a bit while I was replacing batteries and cleaning sensors:

However, next time it rained it stopped again. Then it dried up and started again. Then rained again, etc. So it was dying when wet. And the humidity reading was stuck at 99%. I tried all the troubleshooting procedures I could find but was unable to restore functionality.

So, I bought a new sensor array and installed it today. The new array is an upgraded design. It's easier to take apart and clean. They reduced the power requirements so it runs on 2 AA batteries instead of 3. And they added a super capacitor to the solar array so it can run off sunlight without pushing any current through the batteries (the previous version pushed the solar current through the batteries to both stabilize the power and trickle-charge the batteries).

So the my weather station is up and running again!

First LED bulb failure

December 1, 2019 4:38 pm

We had an LED bulb fail for the first time. We put 5 Philips bulbs in our over-the-table chandelier when we moved into our house. A week or two ago one of the bulbs began shutting off after being on for ~30 minutes and it would then cycle on and off. That suggests to me an overheating problem. Now the bulb doesn't light at all.

It lasted almost exactly 7 years and the other 4 bulbs in the fixture are still going just fine. I expected it to last longer and maybe it was flawed (we'll see what happens with the other 4 bulbs). But 7 years is pretty good since it paid for itself in reduced electrical usage after about 1.5 years.

Mercury Transits the Sun 2019

November 11, 2019 8:22 am

The transit started before sunrise in California, but I thought I'd try to get a picture before heading to work.

My first shot overexposed the sun, but is kind of neat anyway. It's wisteria below and our tree off to the right.

Pentax K-7, 200mm, f/32, 2s. (ND filters)

I took a few other shots and realized my lens has a number of spots that need to be cleaned. I thought they were mercury, but across several shots determined they were moving with the lens and not across the sun.

Looking closer I believe I did manage to get Mercury, smaller than my dirt spots. I believe the spot just above dead-center of the sun is Mercury:

Pentax K-7, 200mm, f/32, 1/25s. (ND filters)

Applying TK Themes to Git Gui

March 7, 2019 2:43 pm

Stashing this here for my own future information since it took me some time to figure out. How to change how Git Gui / Gitk look using different TK themes and how to install and use an external TK theme (such as one of these:

How to Check Installed Themes

In Linux, you probably already have everything you need to adjust the TK theme used by Git Gui without installing anything new. To check what themes are available we can use the TK tool "wish". Running "wish" will popup a window into which you can build widgets, we'll just ignore it for our purposes.

We can check the TK version with "info patchlevel" and then list out the built-in themes with "ttk::style theme names":

$ wish
% info patchlevel
% ttk::style theme names
clam alt default classic
% exit

We currently have the built-in themes: clam, alt, default, and classic

How to Switch Themes

We can temporarily switch the theme to see if we like it using this magic:
echo '*TkTheme: [insert theme name here]' | xrdb -merge -
For example:

$ echo '*TkTheme: clam' | xrdb -merge -

And then if we run git gui it will be styled slightly differently than the default:

$ git gui

To make the change stick we need to adjust our user settings. Create or edit the file .Xresources in your home directory:

$ nano ~/.Xresources

And add to that file:

*TkTheme: clam

Now when you reboot (or restart the X server), git gui will use the "clam" theme.

How to Install External TK Theme

I grabbed the awthemes.tcl file from the above-linked list of themes. Awthemes provides the "awdark" and "awlight" themes. But then you have to figure out what to do with it to actually use them.

First, let's stash it somewhere useful:

$ mkdir ~/.local/share/tk-themes
$ mkdir ~/.local/share/tk-themes/awthemes
$ mv ~/Downloads/awthemes.tcl ~/.local/share/tk-themes/awthemes/

And now we create a package index file:

$ nano ~/.local/share/tk-themes/awthemes/pkgIndex.tcl

And put in there:

package ifneeded ttk::theme::awdark 2.3 [list source [file join $dir awthemes.tcl]]

Make sure you match the version number you put into pkgIndex.tcl to the one set in awthemes.tcl.

And, finally, we need to let TCL know where to find our external themes. We do this by setting an environment variable in our profile.

$ nano ~/.profile

Add the following to the end of that file:

# TK Themes
export TCLLIBPATH=$HOME/.local/share/tk-themes

Now logout and log back in (or use "source ~/.profile").

In order to see our theme we have to request it so that TK will go look for it:

$ echo '*TkTheme: awdark' | xrdb -merge -

If we check our installed themes again we'll see the "awdark" and "awlight" themes are now available.

$ wish
% ttk::style theme names
awlight clam alt default awdark classic
% exit
If we set the theme in ~/.Xresources it will be found and loaded when the X server starts.
$ nano ~/.Xresources

And change it to:

*TkTheme: awdark

Reboot your machine and when you log back in you should be using the new theme when you run git gui or gitk.

Unfortunately, I have not yet figured out how to adjust the ListBoxes and Text widgets using the
::ttk::theme::awdark::setTextColors and
::ttk::theme::awdark::setListboxColors procs as described in the awthemes documentation.

Mint 19 + Kodi 18 + Intel NUC i3

December 27, 2018 10:39 am

I'm finally upgrading my OS and it's time for a follow up on my popular post on setting up Kodi on Ubuntu 14.04.  It was invaluable to me in re-figuring out bits and pieces and some things have changed.

Rather than write out what's changed explicitly, I'll write this as a fresh guide and make notes when something is different than it was 4 years ago.

I'm using Linux Mint 19 now, which is based off Ubuntu 18.04.  These instructions will likely work fine for Ubuntu 18.04.  I'm using Kodi 18 (Leia) on an Intel NUC i3 D34010WYK.  As I write this Kodi 18 is on Release Candidate 3 (I was really hoping they'd have the final build out by now, but now is when I have time off).  Not a problem though, switching the PPA is easy (see below).

Update NUC’s UEFI

I grabbed the latest firmware from Intel (version 50) and flashed it onto the NUC.  Glad to see Intel used a sane process.  Just grab the .BIO file and put it on a USB flash drive.  Upon boot, hit F7 and navigate to the BIOS Flash Update Tool.

Install Linux Mint 19.1

I then installed Mint 19.1.  I won't cover that in this post.  Plenty of better places to find that information.  I'm using the 64-bit distribution.

Install Kodi 18

The Kodi Wiki install guide is pretty clear:

$ sudo apt install software-properties-common
$ sudo add-apt-repository ppa:team-xbmc/ppa
$ sudo apt update
$ sudo apt install kodi
Note: ppa:team-xbmc/ppa is for the final release versions.  If you want a beta/release-candidate build (as I did for this installation) just switch ppa:team-xbmc/ppa to ppa:team-xbmc/unstable.

When the final version is released, you can switch to the stable build:

$ sudo add-apt-repository -r ppa:team-xbmc/unstable
$ sudo add-apt-repository ppa:team-xbmc/ppa
$ sudo apt update
$ sudo apt upgrade

ALSA, PulseAudio, TrueHD, DTS-HD MA

From what I can tell not much has changed in this aspect of the guide.  You can use PulseAudio directly with Kodi now, but you won't get TrueHD or DTS-HD MA passthrough support.  And your streams are all processed on-system instead of being sent to your receiver for processing.  So we'll continue to drop down to ALSA instead.

We use a custom XSession to accomplish this.  Which means we log in directly to Kodi instead of logging in to a desktop and running Kodi as an application.

Create our custom session launcher:

$ nano ~/kodi_custom_session_launcher

Paste in:

# Kill PulseAudio so KODI will use ALSA for proper passthrough support
echo autospawn = no > ~/.config/pulse/client.conf
killall pulseaudio
# Start KODI
# Restore Pulse Audio
rm ~/.config/pulse/client.conf
pulseaudio --start

Make the launcher executable:

$ chmod +x ~/kodi_custom_session_launcher

Now create the custom XSession entry:

$ sudo nano /usr/share/xsessions/Kodi_ALSA.desktop

And paste in:

[Desktop Entry]
Name=Kodi with ALSA
Comment=This session will start KODI Media Center
Note: Change "kyle" to your username

Now if you log out you should be able to select "Kodi with ALSA" as a session option from your login manager.  In Mint, this is accomplished by clicking the circle to the right of the user name.

Kodi Configuration

Note: Previously I had to workaround a bug with 24p audio/video synchronization.  That's no longer necessary.

I setup some stuff in Kodi's advanced settings file to disable the splash screen, hide the ext4 file system's "lost+found" directories, and increase the network streaming buffer.

Create the file:

$ nano ~/.kodi/userdata/advancedsettings.xml

And paste in:

<?xml version="1.0" encoding="UTF-8"?>

NUC's Remote Control IR Receiver

To use the NUC's built-in IR receiver we need to install the ir-keytable utility:

$ sudo apt install ir-keytable

Then we define the keytable we need for the Onkyo RC-764M remote using the Xbox keycode 33003.  Create the file:

$ sudo mkdir /etc/rc_keymaps
$ sudo nano /etc/rc_keymaps/onkyo_rc-764m_nec_33003

And paste in:

# table onkyo_rc-764m_nec_33003, type: NEC
# Using Onkyo Remote Code 33003
# Code mappings match same buttons when using Original Xbox Dongle Remote Code
# ScanCode LIRC_KEY # Remote button text
# LIRC_KEY is modified to get correct action in XBMC using LIRC-in-kernel fake-keyboard actions

0x2d2d3a KEY_I #Display
0x2d2d59 KEY_LEFT #Left
0x2d2d5a KEY_RIGHT #Right
0x2d2d47 KEY_UP #Up
0x2d2d48 KEY_DOWN #Down
0x2d2d4a KEY_C #Guide/Top Menu -- Context Menu
0x2d2d4b KEY_ESC #Prev CH/Menu
0x2d2d45 KEY_BACK #Return
0x2d2d56 KEY_O #Setup -- Codec Info
0x2d2d58 KEY_ENTER #Enter
# UNUSED 0x2d2d4f #Audio
0x2d2d35 KEY_COMMA #Skip Left
0x2d2d34 KEY_PERIOD #Skip Right
0x2d2d32 KEY_R #Rewind
0x2d2d33 KEY_F #Fastforward
0x2d2d31 KEY_P #Play
0x2d2d38 KEY_SPACE #Pause
0x2d2d39 KEY_X #Stop
0x2d2d3b KEY_1 #1
0x2d2d3c KEY_2 #2
0x2d2d3d KEY_3 #3
0x2d2d3e KEY_4 #4
0x2d2d3f KEY_5 #5
0x2d2d40 KEY_6 #6
0x2d2d41 KEY_7 #7
0x2d2d42 KEY_8 #8
0x2d2d43 KEY_9 #9
0x2d2d44 KEY_0 #0
# UNUSED 0x2d2d4e #+10
# UNUSED 0x2d2d46 #CLR
# UNUSED 0x2d2d7c #Search
# UNUSED 0x2d2d7d #Repeat
# UNUSED 0x2d2d7f #Random
# UNUSED 0x2d2d7e #Play Mode

Now configure a systemd service to load the keytable at boot.  Create the service file:

$ sudo nano /etc/systemd/system/ir_receiver.service

And paste in:

Description=Configure the IR Receiver for the desired keytable

ExecStart=/usr/bin/ir-keytable -c -p NEC -w /etc/rc_keymaps/onkyo_rc-764m_nec_33003


ExecStart needs the absolute path to the ir-keytable executable.  Here's what the command options do:  "-c" clears the existing keytable.  "-p NEC" puts the receiver in NEC mode. "-w /etc/rc_keymaps/onkyo_rc-764m_nec_33003" loads our custom keytable.

And enable the new service:

$ sudo systemctl enable ir_receiver.service
Change Note:
Previously I had a custom script that would unload and reload the nuvoton-cir kernel module.  That doesn't appear to be needed anymore.  Maybe it never was.

That script also used to run via rc.local.  That is no longer preferred and we use the systemd service instead

Screen Tearing

I have not seen any screen tearing yet, so I don't think this workaround is needed anymore.


Now Kodi is up and running and everything is grand.

Bonus: Logitech Media Server

I also run Logitech Media Server for the fleet of Squeezebox Radios in the house.  Last time I set up a repository which kept installing updates and clobbering my configuration.  This time I just installed directly from a DEB file.

The information for LMS is a mess.  Lots of out-of-date information and lack of clarity on recommended approaches.  The main place to start is the Wiki page for Debian Packages (Mint is a derivative of Ubuntu which is a derivative of Debian).

One of the links on that page will take you to a package repository where you can download the latest DEB package (currently 7.9.2).  I grabbed the Debian amd64 package and installed it with:

$ sudo apt install ./logitechmediaserver_7.9.2~1545144292_amd64.deb