All Questions
0
votes
1answer
7 views
How is memory split by CMA?
The post at http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=19334&p=218282&hilit=cma#p217665 mentions that:-
gpu_mem_512=316
cma_lwm=16
cma_hwm=32
In the above ARM has 96M ...
-2
votes
1answer
22 views
which key types the “|” symbol
This symbol is useful when using the terminal to pipe results of a command to other commands.
Here is an example of what you can do with piping
0
votes
1answer
12 views
Running Plex server on Raspbian OS
I got a raspberry pi a few weeks ago and I want to do so much projects with it. Right now I have it working as a file server for my home network. I have a lot of movie and video files on a hard drive ...
0
votes
0answers
16 views
How to setup a shortcut key to run the terminal in Raspbian using the keyboard keys?
The title says it all.
I don't mind if the answer is via the GUI or the command line
0
votes
0answers
17 views
Raspberry pi video streaming image error
I have a problem with video streaming on raspberry pi. When I want to stream the webcam's image trough the network, the image has many errors, like fall apart, other colors and lot of garbage appear ...
0
votes
1answer
23 views
Speed up C code running USB webcam
I have some code that I have adapted to run on a headless Rpi using a usb webcam, it is running a bit slow, so my questions are:
If I were to use the GPI pins with a dedicated webcam would that be ...
1
vote
1answer
34 views
Confirm system crontab functionality on Arch
Arch ARM comes with cronie cron daemon. However I can't find the system crontab file and running crontab -l as root returns no crontab for root.
systemctl is-enabled cronie reports enabled
I have a ...
1
vote
1answer
30 views
Ethernet light doesn't go on
I have just bought Pi, and I have no monitor to plug into it, so I thought I would do the DHCP trick. I installed the latest Raspbian wheezy (2013-02-09) on the SD and connected the ethernet cable ...
1
vote
2answers
35 views
Creating boot script for webcam
I seem to be having trouble getting this to work, I'm trying to run mjpg-streamer when the Raspberry boots, but it doesn't using the script below. I have mjpg-streamer installed in: ...
0
votes
1answer
18 views
Configure the port knocking server (knockd)?
I'm trying to configure port knocking on my RasPI running Raspbmc, using knockd.
Here's what I've done:
sudo apt-get update
sudo apt-get install knockd
...then edited the files:
...
2
votes
1answer
36 views
Random GPIO values when ribbon cable is connected
I've installed the GPIO python library to read/write to GPIO pins. To get the state of the pins I'm using "gpio readall" which displays a table with all the pins from the RPI and I can see which pin ...
0
votes
0answers
12 views
No audio recording using USB-soundcard
I have this issue. In short, I tried to use AlsaMixer with an usb-soundcard labelled Logilink USB2.0 to Audio Adapter. It is being recognized, I can play audio and hear it through the connected ...
0
votes
1answer
35 views
What is the pin distance of GPIO
I'm going to buy necessary stuff for using the GPIO from a Czech reseller to avoid the shipping costs. For this, I need to know: What is the nominal distance of the pins on the GPIO?
(I don't have my ...
1
vote
0answers
27 views
How to use socat to transfer serial commands in a script over TCP/IP?
I have a web application that will constantly post some queries and get replies from a device through the serial port on Raspberry Pi. Like this:
@cherrypy.expose
def login (self, **data):
...
0
votes
1answer
38 views
Recieve SMS messages from a Huawei dongle
I have settled up my internet connection as described at it's a clean machine blog . I've settled everything up. However, my ISP informs me by an SMS that I'm getting close to the monthly FUP, and I ...
1
vote
0answers
86 views
How can I stream h264 video from Raspberry camera module via Apache/Nginx for remote stream view?
So I got the Raspberry Camera today and got stills working fine.
Capture an image in jpeg format:
raspistill -o image.jpg
Capture a 5s video in h264 format:
raspivid -o video.h264
...
2
votes
2answers
49 views
Remote Desktop With xrdp
I have installed xrdp on my Raspberry Pi (which is connected to my TV) and a program called CoRD on my Mac that lets me connect to the RPi remotely and I am able to see the RPi desktop without any ...
0
votes
0answers
12 views
How to install pre-compiled Ruby 2.0 on Raspbian?
I am usually recommend to people who want to install Ruby to use something like RVM or rbenv (my preference). However, I'm in the process of installing Ruby from source (using rbenv) and it has taken ...
0
votes
1answer
34 views
Omxplayer (Raspbian Hard Float) vs OpenElec
I've got a couple of 1080p videos that I'd like to play in my Raspberry Pi (512 MB). This is part of a project I'm doing with a couple of friends. We built a server in Node.js and use a local client ...
1
vote
1answer
49 views
What is the “AP” on the Raspberry Pi, from the FAQ?
In the temperature FAQ, it "the LAN9512 is specified by the manufacturers being qualified from 0°C to 70°C, while the AP is qualified from -40°C to 85°C."
Does anyone know what the "AP" is? Is it the ...
1
vote
1answer
36 views
I2C cable length and type
I have made some tests with a temperature sensor tmp102 connected with 1m long cables and it works great. Now I am wondering if I can use a 10m long cable and if yes, what type of cable shall I use? ...
0
votes
0answers
26 views
Why am I seeing some garbage bytes at the serial console login?
When I log into my serial console using screen /dev/ttyUSB0 115200, I see some garbage in the output:
��
Arch Linux 3.6.11-10-ARCH+ (ttyAMA0)
raspberry login: root
�Password:
Login incorrect
...
2
votes
1answer
64 views
Why does raspbian use ext4 for it's rootfs with journaling enabled?
ext4 with journaling is a robust file system that avoids corruption after power loss. However, this doesn't seem to work for Raspberry Pi's. I assume this is because memory cards (and/or our memory ...
1
vote
3answers
85 views
How to printscreen on Raspberry Pi?
I would like to screenshot the Midori browser and i've tried the following methods as mentioned HERE.
Using Imagemagick which is pre-installed in Raspberry Pi. I pressed the printscreen key on the ...
0
votes
0answers
17 views
Raspbian Bug — error: 'AT_SYMLINK_NOFOLLOW' undeclared
I am getting following error when compiling cmake package.
error: 'AT_SYMLINK_NOFOLLOW' undeclared
What is cause of this error please suggest. Is this bug in Raspbian because it is defined in ...
0
votes
1answer
44 views
USB Hard drive mounting as Read-Only
I've been mounting it with sudo mount -t ntfs -o umask=000 /dev/sda1 "/media/My Book" but for some reason it now says mount: warning: /media/My Book/ seems to be mounted read-only when I do so, and ls ...
1
vote
1answer
39 views
Is it possible to detect input voltage using only software?
I'm a newbie to Raspberry Pi's, but one of the things I was thinking about doing is running it off batteries (I see many people do this) - that led me to concerns about shutting down gracefully. Is ...
1
vote
2answers
76 views
NAS with a cluster of some raspberry pi
Is it possible to make a high performance NAS with a Raspberry Pi cluster (2 to 4 pis)? With high performance I mean able to handle streaming of 2 full HD movies at the same time.
Let's say I have 4 ...
4
votes
1answer
128 views
Waterproof solar battery enclosure for my Pi?
There are numerous topics out there about powering Raspis from batteries or from solar or just making a waterproof enclosure... But I'm a programmer, not an electrician. I would end up plugging the ...
4
votes
2answers
128 views
How does Pi keep track of time interval?
As I understand RTC is needed to keep track of time. However, Raspberry Pi does not have that and use NTP servers to synchronize its time.
All that is fine, but how does Pi know that one millisecond ...
-1
votes
0answers
36 views
Is it possible to host Discourse on a Raspberry PI
Any one tried to host discourse (http://www.discourse.org/) on a raspberry pi? Or is there any issue that cannot be solved on a pie?
Thanks for any input.
2
votes
1answer
56 views
What is the mmcqd process?
I have a Raspberry Pi running Raspbian Wheezy headlessly with all graphics-related software uninstalled.
I have bitcoind running, which is mostly consuming most of the resources. Usually, when I ...
1
vote
2answers
71 views
How to restore the original iptables configuration?
I use RaspBMC as OS which stores its "persistent" iptables configuration in /etc/network/if-up.d/secure-rmc and I presume it's applied when the eth link goes up (e.g. after boot).
If I futz with the ...
1
vote
2answers
29 views
SSH and rsa authentication on mpich2
I'm trying to build a small cluster of pi's and am using mpich2 to run parallel code. It appears mpich2 has installed ok and I'm able to ssh into both (I'm starting with 2) pi's. However when I run a ...
1
vote
1answer
87 views
Is it possible to power the RPi by re-assembling the ethernet port?
Based on this schematics document, I think it is possible to power the Raspberry Pi using the Ethernet port. (See page 3, location 5-6 I-J.)
Unsolder the Ethernet connector, take pins 4,5 and 7,8.
...
0
votes
0answers
36 views
Using PocketSphinx with Blue Microphone on RPi
I'm trying to compile PocketSphinx and use it to do voice recognition from a Blue Snowflake microphone. The code compiles fine, but when I try to run it, I get the following error:
pi@raspberrypi ...
1
vote
0answers
32 views
How to get TP-Link WN722N working with Fedora 17 Remix?
I copied the htc_9271.fw file into /lib/firmware as per RPi VerifiedPeripherals - eLinux.org.
The output of lsusb shows that the device is connected. However, iwconfig does not show any interface ...
1
vote
1answer
28 views
WPA_GUI “the configuration could not be saved”
I'm trying to setup WiFi on my RaspberryPi running Raspbian. WPI_GUI refuses to allow my to save it's configuration as
The configuration could not be saved. The update_config=1
configuration ...
1
vote
2answers
53 views
Forcing HDMI Audio Breaks Resolution?
I have a little problem with trying to force audio via an HDMI TV/Monitor, heres what I can get the Pi to do.
Without forcing HDMI Mode using hdmi_drive=2 the monitor works fine with the correct ...
1
vote
3answers
82 views
PHP to execute Python scripts for GPIO
I found this code somewhere, that can execute Python scripts from PHP.
I've installed apache2 on the Pi and I'm able to access the PHP script. But when I press the HTML buttons, nothing happens! :(
...
1
vote
1answer
32 views
Python Synth with Raspberry
I'm trying to create a synth using python with raspberry pi. I've written the code for manipulate the gpio input (i've modified the electronic of an old pianola and connected it to raspberry with the ...
0
votes
3answers
86 views
Unable to connect to Raspberry Pi over the network
I just bought a Model B and I downloaded an image of Raspbian from the downloads page and wrote it over to my SD card using the dd command.
I edited my cmdline.txt file to have the following line :-
...
1
vote
1answer
95 views
Controlling PI's GPIO over Wifi (WebIOPi alternatives)
I'm looking for alternatives to WebIOPi.
I need to be able to control PI's GPIO through a UI displayed in the browser (with a Customizable UI ofcourse)
Any suggestions?
TIA.
0
votes
1answer
36 views
Striping down for java/swing only thin client
Very important note: This same question is also asked at the raspberry pi forums. I guarantee to copy answers from here to there with correct credentials.
Hello everyone
I am currently developing a ...
0
votes
1answer
57 views
Time a GPIO input
I want to time the duration a input GPIO pin is HIGH with microsecond precision.
I tried while loop with time.time(), but it adds a lot of rogue delays.
Any ideas?
1
vote
1answer
54 views
How long does it take to perform the initial update?
I just ran sudo apt-get update && sudo apt-get upgrade on my pi to update for the first time. It's still going at it, and I was just wondering if I should be worried since it's been 1 hour and ...
0
votes
0answers
45 views
Raspbmc(UPNP) + PS3MediaServer
I just installed Raspbmc on my pi and I tried to use the PS3MediaServer as a UPNP device but it's not coming up on the list of devices? Am I going about this wrong? I have them both on the same ...
1
vote
2answers
178 views
Raspberry Pi apt-get update/upgrade on Raspbian hangs?
Whenever I try to update my pi using sudo apt-get update && sudo apt-get upgrade it will often hang at some point during the installation. It's been different ones each time, but the last was ...
0
votes
1answer
43 views
raspberry pi and Scream out loud - 110dBA fixed tone Siren
I have a Scream out loud - 110dBA fixed tone Siren and I was wondering if anyone had used it as a ”alarm” speaker.
Can anyone help me with tips on how to use it?
0
votes
1answer
27 views
Where should put debian package of ceph for pi
so where should I put upload the .deb file when done. Their dot lib for the doc's if anyknows of a package for this please give me a heads up about it.
