Changes

Raspberry Pi

13,641 bytes added, 00:19, 1 November 2015

→‎C-Media USB sound device

*Follow EASY setup - http://elinux.org/RPi_Easy_SD_Card_Setup

*resizing main partition from booted raspberry pi - http://elinux.org/RPi_Resize_Flash_Partitions

==TextMate and rmate for simple remote editing==

*install textmate on os x system

*install ruby on raspberry pi:

sudo apt-get install ruby

</syntaxhighlight>

*install rmate on raspberry pi:

sudo gem install rmate

</syntaxhighlight>

*setup ssh tunneling

ssh -R 52698:localhost:52698 pi@192.168.2.144

</syntaxhighlight>

=Debugging=

==Using a USB to TTL cable==

*Install USB drivers

**for os x - http://sourceforge.net/projects/osx-pl2303/

*Connect pins like so: http://www.adafruit.com/images/medium/954close_MED.jpg

*NOTE: LEAVE THE RED WIRE OFF TO USE EXTERNAL POWER SUPPLY. leave the red wire connected to power pi from the usb cable.

*Use <code>screen</code> to connect to pi. From Terminal, start session:

**<code>screen /dev/cu.usbserial 115200</code>

==What port is my raspberry pi on?==

*list all device addresses on a port

**<code>arp -i bridge0 -a</code>

==Set IP address==

*On OS X set ethernet to DHCP with manual addressing. Choose address 192.168.3.1.

*Scan for raspberry pi: <syntaxhighlight lang="bash">sudo nmap -sP 192.168.2.1/24 | awk '/^Nmap/{ip=$NF}/B8:27:EB/{print ip}'</syntaxhighlight>

==Set .local name==

=Maintenance=

==Backup your System Image==

===backup with rpi-clone===

*uses dd and rsync:

https://github.com/billw2/rpi-clone

===backup with tar.gz===

http://sysmatt.blogspot.com/2014/08/backup-restore-customize-and-clone-your.html

===backup with dd===

*power off the pi, remove the sd card, and insert it in your computer.

*check what drive it is. on os x:

**<code>df</code>

**you should see something like ''/dev/disk2s1'', figure out which is your hard drive and which is the SD card.

*unmount the card.

**<code>diskutil unmount /dev/disk2s1</code>

*duplicate the disk to your hard drive. replace the second argument, ''of=/Volumes/Cistern/RaspberryPi/...'' with the path and filename where you want to backup the image.

**<code>sudo dd if=/dev/rdisk2 of=/Volumes/Cistern/RaspberryPi/wheezy-20130522-backup.img bs=1m</code>

**you can hit '''Ctrl-t''' on your keyboard to see stats about the copy in progress.

*when it is done. eject the disk.

**<code>diskutil eject /dev/rdisk2</code>

==Restore from backup image==

*repeat steps above to insert SD card, identify, and unmount.

*duplicate from image file to sd card:

<syntaxhighlight lang="bash">sudo dd if=twomey2-20140130-backup.img of=/dev/rdisk2 bs=1m</syntaxhighlight>

==Shrinking too large image==

*http://www.raspberrypi.org/phpBB3/viewtopic.php?t=19468&f=26

==Backup and Restore Raspberry Pi images to smaller SD cards, using a Linux computer==

*http://redey.net/Blog/?p=407

==Add a Data Partition==

*shrink http://www.hack-job.org/general/resize-raspberrypi-root-partition/

*shrink http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=60161&p=450676&hilit=shrink+partition#p450676

'''4 GB''':

rtwomey@rtwomey-MacBookPro:~$ sudo fdisk -u /dev/mmcblk0

[sudo] password for rtwomey:

You will not be able to write the partition table.

Command (m for help): p

Disk /dev/mmcblk0: 3959 MB, 3959422976 bytes

4 heads, 16 sectors/track, 120832 cylinders, total 7733248 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000f06a6

Device Boot Start End Blocks Id System

/dev/mmcblk0p1 8192 122879 57344 c W95 FAT32 (LBA)

/dev/mmcblk0p2 122880 7733247 3805184 83 Linux

</syntaxhighlight>

'''16 GB'''

rtwomey@rtwomey-MacBookPro:~$ sudo fdisk -u /dev/mmcblk0

Command (m for help): p

Disk /dev/mmcblk0: 16.1 GB, 16130244608 bytes

4 heads, 16 sectors/track, 492256 cylinders, total 31504384 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00014d34

Device Boot Start End Blocks Id System

/dev/mmcblk0p1 8192 122879 57344 c W95 FAT32 (LBA)

/dev/mmcblk0p2 122880 31504383 15690752 83 Linux

</syntaxhighlight>

==update firmware with rpi-update==

*https://github.com/Hexxeh/rpi-update

=Configuration=

==create local wifi hotspot==

*http://www.daveconroy.com/turn-your-raspberry-pi-into-a-wifi-hotspot-with-edimax-nano-usb-ew-7811un-rtl8188cus-chipset/

*https://forums.adafruit.com/viewtopic.php?f=19&t=47716

==create .local domain name for raspberry pi==

*http://www.howtogeek.com/167190/how-and-why-to-assign-the-.local-domain-to-your-raspberry-pi/

~~=configuration=~~

==apt-get not connecting==

*add DNS server. see here:

=Software=

==pocketsphinx / usb mic==

https://wolfpaulus.com/journal/embedded/raspberrypi2-sr/

==google speech scripts==

<s>*install pyaudio:

sudo apt-get install python-pyaudio

</syntaxhighlight>

</s>

*install pyaudio dependencies:

sudo apt-get install libportaudio0 libportaudio2 libportaudiocpp0 portaudio19-dev

</syntaxhighlight>

*install pyaudio:

git clone http://people.csail.mit.edu/hubert/git/pyaudio.git

cd pyaudio

sudo python setup.py install

</syntaxhighlight>

*install flac:

sudo apt-get install flac

</syntaxhighlight>

*clone google speech scripts:

git clone https://github.com/jeysonmc/python-google-speech-scripts

</syntaxhighlight>

==Voice Command==

*http://www.instructables.com/id/Raspberri-Personal-Assistant/?ALLSTEPS

*http://stevenhickson.blogspot.nl/2013/06/installing-and-updating-piauisuite-and.html

*http://blog.oscarliang.net/raspberry-pi-voice-recognition-works-like-siri/

===Jasper===

http://jasperproject.github.io/documentation/software/architecture.png

*http://jasperproject.github.io/

==FM Transmitter==

*FM transmitter with python code - http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter

*sphinx on raspberry pi - https://sites.google.com/site/observing/Home/speech-recognition-with-the-raspberry-pi

*http://www.raspberrypi.org/phpBB3/viewtopic.php?f=37&t=9487

==Pockesphinx==

*Install libasound2-dev, bison (bison was already installed on my raspberry pi):

**<code>sudo apt-get install libasound2-dev </code>

*Get sphinxbase and pocketsphinx, preferrably putting them in a code directory:

**<code>wget http://sourceforge.net/projects/cmusphinx/files/sphinxbase/0.8/sphinxbase-0.8.tar.gz</code>

**<code>wget http://sourceforge.net/projects/cmusphinx/files/pocketsphinx/0.8/pocketsphinx-0.8.tar.gz</code>

*Unzip:

**<code>tar -xzf sphinxbase-0.8.tar.gz</code>

**<code>tar -xzf pocketsphinx-0.8.tar.gz</code>

*Generate configuration files. In the sphinxbase-0.8 directory:

**<code>./autogen.sh</code>

**<code>make</code>

**<code>make install</code>

*Repeat in pocketsphinx-0.8 directory.

*test is out

**<code>src/programs/pocketsphinx_continuous -samprate 48000</code>

==megahal==

*try it -

==supercollider==

*try this: http://wiki.linuxaudio.org/wiki/raspberrypi

others

*installing on rpi: http://sam.aaron.name/2012/11/02/supercollider-on-pi.html

*example install directory: <code>/usr/share/doc/supercollider/examples/</code>

**play a file: <code>omxplayer -o hdmi ~/Movies/robot_playing_catch.mp4</code>

*play script: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=9789&p=112154

==Video==

*RPi video looper - http://www.timschwartz.org/raspberry-pi-video-looper/

==OSC==

./client</nowiki>

If you've done everything successfully, you should see a variety of sample output from the running <code>server</code> program.

==receive osc messages through puredata pd==

*https://www.youtube.com/watch?v=ZBX7UzXTmd4

*execute shell commands http://puredata.hurleur.com/sujet-9005-inteface-shell-scripts

==pyOSC==

*http://www.raspberrypi.org/forums/viewtopic.php?t=59714&p=446513

=Graphics=

==OpenGL==

Using OpenGL on the Raspberry Pi appears to be pretty idiosyncratic. For instance, see https://benosteen.wordpress.com/2012/04/27/using-opengl-es-2-0-on-the-raspberry-pi-without-x-windows/. Don't be misled by what is described on that webpage. While correct, far simpler example projects exist on the Raspberry Pi at /opt/vc/src/hello_pi. These are very useful! Read the <code>README</code> there, and get cracking. To get started, you can build every project by running:

sh rebuild.sh</nowiki>

If you would only like to build a subset of the projects, first <code>cd</code> to <code>/opt/vc/src/hello_pi/libs</code>, and build each library included there. Specifically:

cd /opt/vc/src/hello_pi/libs/ilcient && make

cd ../vgfont && make</nowiki>

After these libraries are built, you can then <code>cd</code> to each example project, <code>make</code>, and run the resultant binary file. Please note that these instructions are repeated in the included <code>README</code> file.

=Pi Camera=

*getting started - http://www.raspberrypi.org/archives/3890

*code: https://github.com/raspberrypi/userland/tree/master/host_applications/linux/apps/raspicam

==taking photos with raspistill==

raspistill -o image.jpg

</syntaxhighlight>

*faster photo: https://bitbucket.org/niklas_rother/rasperry-pi-userland/raw/master/host_applications/linux/apps/raspicam/raspifastcamd_scripts

==taking video with raspivid==

*take a video

raspivid -o video.h264

</syntaxhighlight>

*Convert to mp4

ffmpeg -i video.h264 -vcodec copy video.mp4

</syntaxhighlight>

==new video modes==

*http://www.raspberrypi.org/new-camera-mode-released/

*install rpi-update:

sudo apt-get install rpi-update

</syntaxhighlight>

*update:

sudo rpi-update

</syntaxhighlight>

*exploring camera modes:

v4l2-ctl -p 90

</syntaxhighlight>

v4l2-ctl -v width=640,height=480,pixelformat=H264

</syntaxhighlight>

v4l2-ctl --stream-mmap=3 --stream-count=900 --stream-to=test90fps.h264

</syntaxhighlight>

*half resolution, binned:

raspivid -w 1296 -h 972 -t 10000 -o pi_0.h264

</syntaxhighlight>

*90 frames per second VGA:

raspivid -w 640 -h 480 -fps 90 -t 10000 -o test90fps.h264

</syntaxhighlight>

==streaming the pi camera==

*RPi:

raspivid -t 999999 -o - | nc 192.168.2.31 5001

</syntaxhighlight>

*Laptop:

nc -l 5001 | mplayer -fps 31 -cache 1024 -

</syntaxhighlight>

*low-latency: http://blog.tkjelectronics.dk/2013/06/how-to-stream-video-and-audio-from-a-raspberry-pi-with-no-latency/

==python interface (picam)==

*http://www.raspberrypi.org/learning/python-picamera-setup/

==motion-triggered capture==

*PIR triggered (motion triggered) camera

*PIR sensor - http://www.raspberrypi.org/learning/parent-detector/

*launch python script in detached screen session:

sudo screen -dmS mocap /home/pi/code/housemachine/pircam.py

</syntaxhighlight>

*reconnect to screen:

sudo screen -r mocap

</syntaxhighlight>

*copy new video files:

rsync -va --ignore-existing pi@office.local:~/videos/pircam/ ~/Pictures/ceiling_fisheye/

</syntaxhighlight>

*mmal opencv modetect

*set recording format in code.

*with motion detection opencv - http://www.sodnpoo.com/posts.xml/raspberrypi_camera_with_opencv_motion_detection_and_recording.xml

*https://github.com/sodnpoo/rpi-mmal-opencv-modetect

*run in terminal and save motion frames to video:

./mmal_opencv_modect > video.h264

</syntaxhighlight>

==wrap h264 then combine two files==

*concat first and second half:

avconv -i concat:a.h264\|b.h264 -c copy sum.h264

</syntaxhighlight>

*wrap as h264 (with avconv):

avconv -i sum.h264 -vcodec copy sum2.mp4

</syntaxhighlight>

*wrap as h264 (with ffmpeg):

ffmpeg -i sum.h264 -vcodec copy sum.mp4

</syntaxhighlight>

==alternate lens mounts==

*Adding an M12 mount: http://wiki.raspberrytorte.com/index.php?title=Camera_Module_Lens_Modifcation#Lens_Mount_Modification

=Wolfson Audio=

*update wolfson audio drivers - https://blog.georgmill.de/2015/02/18/update-for-wolfson-audio-card-on-raspberry-pi/

*Command line recording - http://www.element14.com/community/community/raspberry-pi/raspberrypi_projects/blog/2014/04/06/wolfson-audio-project

==Jack from OSX to Raspberry Pi==

On Raspberry Pi:

*wolfson script to select audio output:

<syntaxhighlight lang="bash">Playback_to_Lineout.sh</syntaxhighlight> or the direct amixer commands

amixer -Dhw:0 cset name='HPOUT2 Digital Switch' on

amixer -Dhw:0 cset name='HPOUT2L Input 1' AIF1RX1

amixer -Dhw:0 cset name='HPOUT2L Input 1 Volume' 32

amixer -Dhw:0 cset name='HPOUT2R Input 1' AIF1RX2

amixer -Dhw:0 cset name='HPOUT2R Input 1 Volume' 32

</syntaxhighlight>

*run dbus:

eval dbus-launch --auto-syntax </syntaxhighlight>

*copy results and export them:

export DBUS_SESSION_BUS_ADDRESS= ...

export DBUS_SESSION_BUS_PID= ...

</syntaxhighlight>

*start jackd:

<syntaxhighlight lang="bash">jackd -R -T -p 32 -d alsa -n 3 -p 2048 -r 44100 -i2 -o2 &</syntaxhighlight>

*start netone pointed to slave IP:

<syntaxhighlight lang="bash">jack_netsource -H 192.168.0.104 &</syntaxhighlight>

On OS X:

*configure jack for necessary outputs (only done once) (2 in 2 out)

*qjackctl with netone backend

On Pi:

*route jack signals:

jack_connect netjack:capture_1 system:playback_1

jack_connect netjack:capture_2 system:playback_2

</syntaxhighlight>

*jack routing - https://gist.github.com/nyarla/36724e8931fa6bc244a0

*https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_NetJack2

=Hardware Peripherals=

Verified Peripherals - http://elinux.org/RPi_VerifiedPeripherals

~~==Pi Foundation Camera Module==~~

*code: https://github.com/raspberrypi/userland/tree/master/host_applications/linux/apps/raspicam

==C-Media USB sound device==

*setting up with alsamixer, etc - http://asliceofraspberrypi.blogspot.com/2013/02/adding-audio-input-device.html

*setup C-media usb sound device - http://www.cpmspectre.pwp.blueyonder.co.uk/raspberry_pi/MoinMoinExport/DaffodilUSBSoundAdapter.html

==U9 MiniMic==

<syntaxhighlight lang="bash">arecord -f dat | aplay -f dat &</syntaxhighlight>

==C920==

**<code>lpstat -p -d</code>

*lp help http://www.cups.org/documentation.php/options.html

==Wireless Adapters==

*Adafruit adapter: https://learn.adafruit.com/setting-up-a-raspberry-pi-as-a-wifi-access-point/install-software

*LB-Link with mt7601: https://www.raspberrypi.org/forums/viewtopic.php?t=49864

**for kernel 3.18.7-v7: https://dl.dropboxusercontent.com/u/80256631/mt7601-3.18.7-v7-755.tar.gz

=GPIO=

*pin over-voltage protection circuits - http://elinux.org/RPi_Tutorial_EGHS:GPIO_Protection_Circuits

*opencv - http://mitchtech.net/raspberry-pi-opencv/

*julius - http://www.aonsquared.co.uk/raspi_voice_control

=Applications===Use as AirPlay receiver==*http://lifehacker.com/5978594/turn-a-raspberry-pi-into-an-airplay-receiver-for-streaming-music-in-your-living-room*http://www.raywenderlich.com/44918/raspberry-pi-airplay-tutorial

=Problems=

*raspberry pi resets audio device after recording begins. similar to this complaint - http://www.raspberrypi.org/phpBB3/viewtopic.php?t=12086&p=135385

*week 2

*[[Raspberry Pi - Week 3]]

*[[Raspberry Pi - Week 4]]

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Rtwomey

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Changes

Raspberry Pi

Robert-Depot