Raspberry Pi Stack Exchange
Raspberry Pi Stack Exchange

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How to investigate why device crashed?

My Raspi after 6 days of uptime just crashed. I wasn't able to see nothing on the screen, if I plugged a USB device, no action from it. And all the LEDs were steady and not a blink at all. I have the debian distro. I am trying to detect what could…
Pentium10
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Reverse the expand root FS

When installing Raspbian, the first thing you're told to do is to expand the file system to stretch across the whole SD card. Works great. But what if I want to save space when doing a disk image. Can I reverse the expansion, and end up with a small…
Paolo Vacirca
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GPIO Voltage Thresholds

It is obvious, that 3,3 V is a HIGH, and 0 V is a LOW at a GPIO input pin. But I am looking for the exact voltage thresholds for the GPIO input pins. I have a Pi B+ and a Pi 2. Watching this video (for an older Pi) I get: LOW: 0 - 1.19 V HIGH: 1.34…
Dennis
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Snappy Ubuntu - reasons?

It is probably a naive question, but why should someone install Snappy Ubuntu to a Raspberry Pi? I did not get the advantages over Raspbian Wheezy. Maybe somebody has some experience or a case...
jaromrax
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Bluetooth scan usin "hcitool scan" returns no results (Hama 00049229)

When I run hcitool scan the shell shows Scanning... for ~10 sec but doesn't show any results. Same for sudo hcitool scan (I have an Android phone and a PC nearby with bluetooth activated and set to visible) (It did work the first time; I didn't…
gizmo
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Underclock raspberry pi without rebooting

I want to reduce the frequency of operation of my raspberry pi without rebooting. Is there a way to do it ?? I know I can change the frequency by changing the config.txt but it requires a reboot.
maverick
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Python and OpenSSL error on import

So I'm trying to add SSL to my web server running on my pi B+ (using cherrypy) I made sure that OpenSSL was installed with: sudo apt-get install openssl Then I installed pyOpenSSL with: sudo apt-get install python-openssl In both cases it…
jrel
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Upgrading from Pi to Pi2

I've got a regular Raspberry Pi B board, running Raspbian off the SD card. What I would like to know is if I buy one of the new Raspberry Pi 2 boards, can I just swap the card over to the new one, and will everything run as is, or do I need to do…
Chris G. Williams
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Rapberry pi camera module vs usb camera

Is it good to use raspberry pi camera module for serious computer vision project using video or is it okay to use a usb webcam?
parthi82
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Turn LED on and off with switch

I'm trying to write code to get an LED to turn on when it is off and to turn off when it is on using a tactile push button switch. I've written what I believe to be is the right code with the wiringPi library, but I can only get it to turn on when…
Mark Luna
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2 answers

Mount windows share: Bad UNC

I am trying to mount a windows share using this command: sudo mount -t cifs -o username=USERNAME,password=PASSWORD \\192.168.2.12\TestShare mnt/ But it is giving me this error: mount.cifs: bad UNC (\192.168.2.12TestShare) I have also tried these…
Black Magic
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Connecting to WPA2-Enterprise Wifi Network

I'm currently trying to connect to my University wifi network and it's of WPA2-Enterprise type. I found the setup instructions online and I followed them when setting it up using wpa_supplicant. The picture above is the settings the school suggests…
jengafenga
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3 answers

Official MongoDB Repo for ARM Processor for Debian base

Is there an official MongoDB repo for the Raspberry Pi Following: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian/ Got this issue: W: Failed to fetch http://downloads-distro.mongodb.org/repo/debian-sysvinit/dists/dist/Release …
Phill Pafford
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Preventing SD card corruption in the event of power failure

I have a project that uses Pi's in remote locations (roadside cabinets dotted around a city next to important bits of water infrastructure) to read data via USB from some specialised data collection equipment and then transmit it (via an ADSL link)…
Asher Hoskins
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Cambridge University Raspberry Pi Operating system development Guide Questions

I'm a high level app developer (C#, python) and I'd like to get my hands dirty with low level embedded application development. Cambridge University has posted a series of tutorials teaching you how to create an operating system for the Raspberry Pi…
Armen Babakanian
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