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13
votes
4answers
23k 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 ...
2
votes
3answers
8k 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 ...
17
votes
3answers
21k 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 ...
3
votes
2answers
6k 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 ...
7
votes
1answer
5k 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 ...
8
votes
3answers
4k 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 ...
5
votes
5answers
1k 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?
13
votes
2answers
24k 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 ...
3
votes
2answers
15k 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
195 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 ...
4
votes
3answers
358 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. ...
1
vote
1answer
3k 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 ~/...
3
votes
1answer
3k 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
4k 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
454 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 ...
4
votes
3answers
50k 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! :( ...
4
votes
2answers
3k 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
5answers
16k 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: ...
4
votes
3answers
6k 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.
1
vote
1answer
303 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 ...
2
votes
2answers
2k 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. How can I achieve this in python?
1
vote
1answer
9k 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 ...
12
votes
2answers
32k 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
2answers
3k 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
643 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.
0
votes
1answer
240 views

Determining if network time has been set [duplicate]

I want to add a h/w rtc to my RPi. If network time is available, I want to determine this, and use it to set the system time and also update my own rtc. How can I find if network time is ( or becomes )...
2
votes
1answer
8k views

RPi Web Server: 403 forbidden on Apache

I have created a web server with my Pi, and everything was working fine. I got the "It works!" page so I thought "Okay, everything's working". I then decided to upload a new index.html file. After ...
18
votes
3answers
71k views

What is the difference between CEA and DMT?

I have connected my RPi to a television using a HDMI to DVI cable, but the resolution is awful. The font is not sharp, so I need to use a lower resolution. For that, I can run a command like tvservice ...
7
votes
3answers
3k views

Auto-start X application from read-only file system

In order to protect the SD card in an application which may suffer a sudden loss of power I am attempting to mount the root in read-only mode. In the working (read-write) system our full-screen ...
1
vote
1answer
2k views

Allowing weak passwords for users

I just installed my brand new PI using the Wheezy image on Raspberry's site. Problem is it has such a strict password policy I cannot set it to anything less than 6 characters and even then it must ...
2
votes
1answer
1k views

Mono + XSP: WebService example does not work

There have been questions quite similar to this one, but I could not find any solution. So excuse me for asking it again. I'm running Debian Linux and I installed Mono. Once I started the sample ...
1
vote
3answers
2k views

Raspberry Pi USB power from 5V S-ATA from inside 3.5" HDD Enclosure

I have a 3.5" HDD enclosure with external power supply. Inside I have a 2.5" HDD and there is space in there for the RPi. The problem is I don't want to have two power supplies so I was thinking to ...
1
vote
1answer
1k views

Automatically shutting down the Pi after it's been idle for a certain period of time

I'm using my Raspberry Pi as a music server : I've installed MPD running under Archlinux ARM. I'd like to set a cronjob that would check wether MPD has been active for a given period of time and if ...
1
vote
2answers
5k views

Running “sudo dpkg --configure -a” fails

I set up RaspBMC on my Pi. I had a broken repo, so I SSH'd into it and ran sudo apt-get update and sudo apt-get upgrade to fix it. From that, I get E: dpkg was interrupted, you must manually run '...
0
votes
1answer
204 views

Where is my mistake?

I am trying to run a c program which will wait for me to hit a key on a 4x4 keypad and then display the number I have hit. The program I have bit runs but ends just as soon as I start it and I can't ...
1
vote
1answer
5k views

Start/stop Fan at certain time

I have connected a fan to my raspberry pi with a transistor that sits on pin 5 ( GPIO 5 ).' I followed an online "guide" to make it. I would like to make a script that makes it run during the day, ...
1
vote
1answer
2k views

Can the keyboard draw too much power and cause damage?

I've been using a small, lightweight keyboard, fearful that one using a higher voltage would damage my Pi. Could I have invested in a better keyboard or did I do the right thing to prevent damage?
1
vote
5answers
787 views

Advice on RPi taking high res pictures at timed intervals

I'm working on a project with my Raspberry Pi at the moment. I'll give a brief summary of what I'm trying to achieve. I would like my RPi to take high resolution pictures through a USB webcam at ...
2
votes
1answer
298 views

Prioritizing I/O for media playback

I have noticed that I cannot possibly play back a 1080p video from XBMC while something else is going on, e.g. a Samba transfer. Is there a simple way to set up my Raspberry Pi server (or just XBMC) ...
5
votes
1answer
4k views

How is root directory mounted on Arch?

I installed Arch Linux ARM for Raspberry Pi and it doesn't have an entry for the root directory in /etc/fstab but it's still mounted on boot somehow. How is it mounted and how can mount options be ...
4
votes
1answer
6k views

How to connect single GPIO pins?

I want to connect an IR receiver and a gas meter impluse reader to the GPIO port. I saw those ribbon cables, but they have much more wires than needed. Can I by these small connectors for single ...
0
votes
1answer
2k views

PiFace module and sensors

I'm looking all over the forums in order to be sure that I'm able to have two sensors (temperature in my case) and a proximity sensor. Can anyone guide me to a compatibile sensor (I'd prefer a ...
-1
votes
1answer
701 views

Find out if my dongle is AP capable

I'd like to turn my Raspberry PI into an access point. I've read that my wifi dongle has to have an AP mode (here's my dongle: https://www.modmypi.com/raspberry-pi-accessories/wireless-usb-1n-nano-...
6
votes
2answers
7k views

Big Endian distribution for the Raspberry Pi

I have an application that I'm writing on a little endian x86 system, but I would like to test it on a big endian processor to ensure compatibility. I understand that the ARM processor can go big ...
0
votes
1answer
517 views

Can't update rsyslog

I was checking if there were any updates for my raspberry, so I ran: sudo apt-get upgrade There are quite a lot of packages, I installed everything, but when my Raspberry starts to setting up the ...
0
votes
2answers
3k views

Control iOS device from Raspberry Pi?

I am actually wondering if there are any ways to control an iDevice like the iPod Touch or the iPhone, from the Raspberry Pi. I'm not talking about controlling the whole thing, but only the Media ...
1
vote
2answers
8k views

How do I start to to play videos automatically while boot?

I have Raspberry Pi, I would like to play videos automatically while boot instead of clicking manually.So, I decided to do that by using crontab. I want to create a shell script for auto play. Please ...
6
votes
1answer
10k views

Unable to forward external ssh port through router to raspbmc

I am trying to expose my raspbmc's ssh port to the world through my internet router. I can connect to the device on my LAN. I have another Windows 7 machine with cygwin and sshd installed on it and ...
3
votes
2answers
15k views

Raspbmc - can the command-line be accessed from within the GUI?

In Raspbmc, I can get to the terminal command-line by hitting the GUI "Power off" button, choosing Exit and then hitting Esc on the attached keyboard. My question is: can I get to the command-line ...
42
votes
2answers
248k views

How to set my Raspberry Pi to boot into the GUI?

As from my previous question, I asked what the power off button in the corner does. Then somebody said if you boot into the GUI automatically, it will give you some options. How do I boot into the ...

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