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Why do one have to be root to acces gpio?

I have long wondered about this. I mean there are a lot of low level stuff that a user can get access to. If a driver exports gpio to /dev/gpio and that file is writable by group gpio how would that ...
8
votes
2answers
24k views

How to configure serial port settings of /dev/ttyAMA0?

I want to access the serial port by some BASH script files via /dev/ttyAMA0. How do I configure the serial port settings like speed, parity even/odd?
8
votes
2answers
7k views

How does the RF/FM GPIO transmitter hack work?

A while ago, a few guys figured out that they could transmit FM signals using the Raspberry Pi's GPIO ports, and another person realized that he could use the RasPi for controlling his home automation ...
1
vote
3answers
7k views

Suitable power supply for DC power through GPIO?

I'm trying to follow this tutorial on Adafruit, which powers the Pi, and a 1 metre LED strip, through the GPIO using DC. I'm not sure what power source to use as I'm not very experienced with this ...
2
votes
4answers
16k views

Playing various movie file types on Pi

I have a 320GB external hard drive full of various movies, ranging in formats from MP4, MKV, and AVIs with MP3 audio to AVIs with AAC audio. Will the Pi be able to play all these types out-of-the-box ...
5
votes
1answer
1k views

How can I use the RPi GPIO to make a headphone sensing audio jack?

I am working on a project that involves a raspberry pi acting as an internet radio client which the public can access by plugging their own headphones into a 3.5mm (1/8”) jack. They will have access ...
5
votes
2answers
13k views

omxplayer doesn't play audio

I can play audio to analog jack output with mplayer and aplay, but i cannot get it working with omxplayer. # setup audio output modprobe snd_bcm2835 amixer cset numid=3 1 # This is working mplayer -...
1
vote
2answers
2k views

Play video using XBMC in raspbmc displays OpenGLSpectrum instead of video

As question mentioned, when I try play a video in XBMC (my distro is: raspbmc), it play sound and display OpenGL Spectrum instead of display video content ! Can you tell me how to fix this?
2
votes
1answer
1k views

Midori Segmentation Fault

Since a while (approx. 1 month) now midori is not starting anymore and gets a segmentation fault. Yesterday I updated the firmware and software to the latest versions, still no change. I also tried to ...
6
votes
4answers
5k views

Home Automation in an apartment

I'm just getting into the Raspberry Pi and love the idea of home automation. I'd like to use the Raspberry Pi to turn on/off lights, control the thermostat, and possibly a few other tasks in the ...
0
votes
2answers
482 views

Apt-get fails because of libqtcore and libqtdbus4

On a fresh-today Raspbian build I did an apt-get update followed by an apt-get ugrade. I got the following error message: sal@raspberrypi:~$ sudo apt-get upgrade Reading package lists... Done ...
13
votes
4answers
26k views

Raspberry PI and fingerprint scanner

How can I make Raspberry PI work with a fingerprint scanner like this? I found something for Arduino only (http://learn.adafruit.com/adafruit-optical-fingerprint-sensor) Are there any tutorials for ...
3
votes
1answer
1k views

Raspberry Pi camera module manual gain control

Is there a way to set the Raspberry Pi camera module to manual gain control? I've looked in the option of raspivid and there seems to be nothing.
1
vote
2answers
2k views

What happens when we connect the 5V GPIO output with the Ground, why does it restart?

I want to know, what happens when we connect the 5V GPIO output with the Ground of the GPIO, and why the RPi restarts. Also if it's possible, I want to know what's the Technical Explanation for this ...
3
votes
2answers
9k views

No output on HDMI display, but it works on Video

I use my HDMI slot every time I plug my Raspberry Pi in. But I plugged it in the other day, and my monitor just said No Signal. So I plugged it in via Video, and it works. I just don't want to use ...
0
votes
1answer
2k views

hostapd : no such file or directory

I'm trying to make my Raspberry work as an access point with a WiFi dongle that has the "Realtek RTL8188CUS" chipset. I followed the instructions at blog.sip2serve.com and other websites. My problem:...
2
votes
1answer
713 views

Raspbmc install failed - wget

Trying to get Raspbmc installed. I use the windows installer to flash the sd card. Good. Next, I start up the board. It goes through the network install. Takes about 10 minutes, then resets. Ok, ...
4
votes
3answers
5k views

Thermostat using wireless relay

I want to create a thermostat with my Pi to control (also remotely) my heating boiler, using python if possible. Unfortunately I don't know much about electronics, so I'm asking your help just to ...
3
votes
3answers
10k views

Raspberry pi HDMI Output multiple screens

I want to setup a simple movie player on all 5 tv's I have in a restaurant. Is there a way I can split the signal coming out from my raspberry ?
2
votes
1answer
6k views

Detect available open WiFi networks using Python

Is there some way I can detect available WiFi networks, which are open, using Python? I know I can do it on my Ubuntu box, but I haven't received my Pi yet, so I haven't been able to run the same code ...
1
vote
2answers
4k views

How can I get my PS3 to recognize my Pi as a Media Server?

We recently ordered a new computer, it had Windows 8 installed, and one of the things we noticed was that our PS3 saw the new computer, and could access its shared files. I tried to replicate this ...
1
vote
1answer
1k views

Resetting a server with RasPi's GPIO

I have a server (standard ATX motherboard) that tends to lock up, and I'd like to reset it using the Raspi. I know the motherboard has a reset switch/jumper, but I don't know what voltage it outputs ...
0
votes
1answer
3k views

SQLITE/PHP on Raspberry Pi

Wondering if this would be easy/possible. I know MySQL is commonly used but I want to make a sort of web server that can access the Raspberry Pi or more important an External Drive attached to it. ...
1
vote
1answer
2k views

Performance problems with xboxdrv

I wanna use the RPi as an emulation machine, thanks to RetroPie this is not a big problem. To control everything I want to connect multiple Xbox 360 wireless gamepads. This is possible by using ...
13
votes
4answers
10k views

Use SSD as RAM?

How can I use SSD disk space as RAM to run large-memory jobs on the Raspberry Pi? Is this the same in Linux as creating "ramdisk" as per this Q&A?
2
votes
2answers
229 views

Prevent libsane.so.1 from being overwritten during update

I need to run the latest version of Sane-Backends to support my scanner. I've compiled the source such that it's out of the way for the distro's package V1.22 but when I run an update it overwrites ...
5
votes
2answers
3k views

Display Powersaving Options (Pi powered on display USB)

Scenario I'm building several wall mounted kiosk that will be placed in remote locations and i'm trying to find a way to build in some longevity / power saving options (IE put them to sleep when the ...
1
vote
1answer
178 views

LFS on ARM with Blink

I am interested in creating a LFS (Linux From Scratch distro) on ARM with a HTML5 rendering layer, like how Mozilla's Firefox OS has. However, I want to use the new Blink rendering engine powering ...
3
votes
4answers
3k views

GPGPU simple example

I am programming ARM assembly on raspberry and I am wondering whether and how it is possible to access GPU. I already looked userland repo, but I completely do not understand the stucture. I would ...
0
votes
1answer
735 views

Configure Network adapter in Windows to connect to RPi

I have the following issue: I'm not able to connect via SSH (using puTTY) to my RPi. The problem is about the IP configuration that i don't know exactly what it is. At my PC with Windows XP (with ...
2
votes
1answer
4k views

CSR Bluetooth softblocked, and rfkill unblock <id> doesn't work

I am setting up an emulation box and am hoping to use these instructions to be able to use a PS3 six-axis controller. The dongle works fine on my main PC, I can pair, scan, etc. I have Raspbian ...
4
votes
1answer
2k views

Create a connected speaker with a Pi without a hard drive?

I would like to build some "connected speakers" with a Raspberry Pi and an amplifier attached to standard hi-fi speakers (the ones I have have 4 ohms of impedance, about 50W, but I don't need the full ...
2
votes
2answers
6k views

On Raspbmc, play 1080p video full screen on 1080p TV

I just setup Raspbmc on my Raspberry PI which I am using as HTPC. I had installed Raspbian and custom built XBMC earlier and it served the purpose. I liked Raspbmc for its unified packaging and ...
41
votes
2answers
76k views

Raspberry Pi not reachable via its hostname in LAN [closed]

My Raspberry Pi is not discoverable via its hostname in my LAN. I have a couple of other Ubuntu machines in the LAN, and they are all pingable via their hostnames. On my Raspberry Pi: pi@...
6
votes
1answer
629 views

HDMI hisses when turned on before TV

If I turn my Pi on before the TV then I get a hissing/static noise until I yank the HDMI cable and plug it in again. If I turn my TV on during boot it will hiss, but seems to come right once XBMC ...
8
votes
2answers
16k views

i2cdetect doesn't catch ANY address. How can I tell if I2C working correctly?

I'm having difficulties interfacing the Raspberry Pi to basically any I2C sensor. I've gone through a lot of tutorials on how to get the I2C driver to work and my connections are correct. Still, ...
3
votes
1answer
2k views

Security issues in PHP executing PYTHON scrips

So I've got a PHP script thats capable of executing Python commands (to control GPIO), thanks to the users of StackExchange. My previous question here. Now I'm able to control the GPIO pins from a ...
6
votes
2answers
25k views

Setting a static eth0 ip

I have been trying to set up a static IP for my Raspberry Pi. From what I understand I need to change the interfaces file at /etc/network/interfaces. My file (based on this tutorial) looks like this: ...
0
votes
2answers
7k views

Accessing a USB drive after start up with Python

I'm working on a picture viewer using python, that executes on startup of X (using LXDE/autostart) and accesses an attached USB drive and starts to display the images it finds. I'm using the current ...
0
votes
2answers
2k views

Bash Script with GPIO fails - what am I doing wrong?

This simple bash script always executes with my embedded error message, 'Something went horribly wrong.' This script was originally coded by someone else; I have no idea what (exactly) gpio -g mode ...
2
votes
4answers
2k views

Raspberry pi and shift register

I have a project using a Raspberry pi and an 8 bit shift register to pull one of the 8 pins to ground if an event occurs, but leave it at 5 v 99% of the time. Ideally this will be done with Python, ...
2
votes
2answers
2k views

code stops after few hours and raspberry py freezes. (pymodbus + rs485 + raspberry pi) python code

I am using pymodbus to collect some data from sensors 4 reading every sec. The program is in continuous loop but the problem is raspberry pi freezing every few hours (60 hr). The code stops ...
6
votes
1answer
10k views

How can I send a constant stream of the camera module to the screen?

Right now if I type: raspistill -t 60000 I can see the image on screen for 60 seconds, but I just want to show what the camera sees at all times. I am connected via HDMI.
3
votes
1answer
1k views

Raspberry PI freezing

I am working on a project to getting data from serial device and transmit it to web. I am using kernel 3.2.27 with busybox few start up scripts like sysfs and proc, wvdial daemon to dial USB modem for ...
0
votes
1answer
2k views

Capturing video with motion cant go higher than 640x480

I got a webcam that supports images up to 1920x1080 but when i use motion to capture video it can only go as high as 640x480. if i specify anything higher in the motion.conf the webcam doesnt return ...
4
votes
4answers
7k views

Raspberry Pi doesn't boot

My Raspberry Pi doesn't boot. I reisntalled Raspbian as I did the last time, when it worked correctly, and still it doesn't boot. I was working with the GPIO when the display turned off, and after ...
2
votes
2answers
3k views

Raspberry Pi to iPhone Audio Streaming

I am trying to figure out how to get as close to real time streaming as possible from Raspberry Pi to an iPhone (more particularly just an HTTP stream so iPhone or Android could use it). The Raspberry ...
1
vote
1answer
14k views

How can I get back to the initial load screen of Raspbian?

I've installed Raspbian onto my RPi's SD card from the Raspberry Pi downloads. The first time I booted up the RPi, connected to a monitor, I got a list of options, with something like a <select>...
1
vote
1answer
281 views

Streamripper recording only weird noise

I am running Raspbian on my Raspberry Pi. Anyone has tried streamripper? When I use streamripper to record any online radio station, streamripper only records weird noise, no matter what url I put. I ...
1
vote
0answers
2k views

Logitech QuickCam Messenger Communicator webcam drivers

Im trying to figure out if I can get the logitech messenger communicator webcam working with the Pi. (no, its not on the supported software list) In searching for drivers, I came across this link ...

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