Quick and simple this one is. I have a DS9490R (internally it’s a DS1490F) one-wire bus master attached to my Raspberry Pi. 4 DS18B20 temperature sensors are hanging off the bus, and I’d like to access them from the home automation server.
On the Raspberry Pi, or the server/device that’s hosting the 1-Wire bus:
apt-get install owserver ow-shell
echo “ds1wm” >> /etc/modules
Edit /etc/owfs.conf such that the following parameters are entered. I’d advise commenting out the rest (at least, the rest of the server: directives)
! server: server = localhost:4304
server: usb = all
server: port = 0.0.0.0:4304
Restart the 1-Wire server
All being well, the following command should output a listing of all the devices on the bus.
owdir -s localhost:4304 /
On the remote server, simply use the following command to read the data.
owread -s kitchenpi.vpn.glasgownet.com:4304 /28.DDBF1D030000/temperature
My little Raspberry Pi seems to be growing arms and legs.
The other day I hooked up a simple PIR to it. I can’t remember where I got it, but it runs off 5v, consumes a low enough amount of milliAmps to be directly connected to the Raspberry Pi 5v supply, and outputs a TTL compatible 3.3v signal. Bonus!
I wanted to be able to signal to my MQTT broker when motion was detected, so it was time to start monitoring the GPIO pins. I wrote up this short app using the framework I’d made for MQTT-Republisher earlier. MQTT-GPIO-Trigger will accept a list of GPIO pins that you wish to watch, and will cycle through them all and fire off MQTT messages on any state change.
I’ve got a Dell Optiplex 755 hooked up to my Yamaha amp and surround system, and it was about time XBMC was installed on it. It uses a low profile Nvidia GeForce 8400GS for VDPAU acceleration and HDMI audio. These are some rough notes I took whilst setting it up.
Follow this guide to install XBMC on Mint 12
adduser --system --home /var/lib/htpc/ htpc
vipw, change htpc shell to /bin/bash
apt-get install build-essential vim xbmc xbmc-standalone ubuntu-restricted-extras mint-meta-gnome-dvd mint-meta-codecs
sudo apt-get install libirman-dev
./configure --prefix=/usr/ --with-driver=irman
Copy the SysV startup script from a Debian package into /etc/init.d/, use update-rc.d lirc defaults to put it in all the right runlevel directories
Used my existing Hauppauge A415 remote control definition file, and put it in /etc/lirc/
Edited /etc/lirc/hardware.conf to include the following…
Edited /etc/lirc/lircd.conf to include the following at the end…
Ensure the lirc_dev module is loaded at boot, with
echo lirc_dev >> /etc/modules
Start lirc with /etc/init.d/lirc start, and fire up irw. Press some keys on the remote to make sure it works.
Edit /etc/lightdm/lightdm.conf, ensure autologin-user=htpc, and user-session=XBMC
Reboot and bask in XBMC glory
I restored most of my XBMC settings from backups, but the audio settings were of a particular concern. This is what I use to get HDMI passthrough over a NVidia GeForce 8400GS card…
Audio Output : HDMI
Speaker Configuration : 5.1
Audio Output Device : Custom
Custom Audio Device : plughw:0,7
Passthrough output device : Custom
Custom Passthrough device : plughw:0,7
I knew the audio devices courtesy of the output from aplay -l, and some random testing with mplayer got me the results. To test it with mplayer, I just ran mplayer -fs -afm hwac3,hwdts -ao alsa:device=hw=0.7 against the name of a movie I knew had an AC3 soundtrack. Within a couple of seconds the amp was reporting a full AC3 bitstream, and surround sound was filling the living room.