Raspberry Pi Stack Exchange
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1500 questions
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1 answer

Differences of Raspberry Pi models in GPU computation?

I know the publication Biosignal PI, an Affordable Open-Source ECG and Respiration Measurement System which uses Raspberry Pi A+ / B+ as a component isolated by ADums, since RP is not itself a medical device. The final system has been accepted to…
Léo Léopold Hertz 준영
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What Analog to Digital Converters Are Available For RPI?

I am interested in obtaining an ADC (Analog to Digital Converter) or Analog input for the Raspberry Pi. I understand that various boards exits to use an Arduino as input to the Pi and that Libellium has an arduino-like adapter containing Analog…
Ira Laefsky
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2 answers

How do capture audio using Python?

More particularly: How can I use python with ALSA to capture audio input? I'm thinking about doing an oled-based spectrum analyzer for Pi-based audioplayer. One part of the solution is to read the audio currently playing. I've tried this using ALSA…
andig
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2 answers

Jumper function on relay modules

I purchased some very inexpensive one, two and four relay modules on AliExpress that I believe are commonly used with Arduinos. I noticed that the two relay modules have a three pin jumper block (JD) which a jumper came pre installed on. I have not…
Mike
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How to detect what kind of HAT or GPIO board is plugged in - if any?

I am setting up some Raspberry Pis for use in demos to colleagues, in order to show off capabilities of the Pi itself, and of some of the add-on boards that are available. I would really like to be able to maintain one cron-job/start-up script for…
Clare Macrae
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9
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1 answer

Real time audio input/output in Python with PyAudio

I am trying to get my Raspberry Pi to read some audio input through a basic USB souncard and play it back in real time for 10 seconds, and then print the output with Matplotlib after it's finished. I am using PyAudio in callback mode. Audio…
DrumPower3004
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4 answers

Start wireless network automatically on boot-up - how to?

With the great help in WLAN using Netgear WNA1000M fails - what am I doing wrong? I managed to get my wireless network working on Raspbian running on my RPi. But - I need to manually run the wpa_supplicant command wpa_supplicant -i wlan0 -c…
Golo Roden
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9
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3 answers

Custom recovery partition

I am working on a project where upgrades to the Raspberry PI will over HTTP, and the Raspberry PI will not be directly accessible (cannot just swap cards). I would like to have a partition setup like so: Partition 1- /boot (contains kernels for…
beatgammit
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2 answers

Proper way to prevent dnsmasq from overwriting DNS server list supplied by DHCP?

I have two interfaces: wlan0 - Wi-Fi client configured via DHCP; wlan1- static IP address, running hostapd to act as access point, running dnsmasq to give out IP addresses and service DNS requests on that interface. Unfortunately, it seems that…
bigjosh
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3 answers

Where is syslog being written?

I have an out of the box Pi. See below on what I have done. If I have in a PHP script, where the the message being logged? $ sudo apt-get install nginx $ sudo mkdir /var/www $ sudo apt-get install…
user1032531
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Can the bug with class 10 SDHC cards be fixed in firmware?

It seems relatively well known now that there's a lot of problems with class 10 SDHC cards: There are issues with most Class 10 SDHC cards, apparently due to a bug in the Broadcom bootloader.(link) Is this a problem that can be fixed with a later…
berry120
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X forwarding and GPU memory allocation

I run my Raspberry Pi headless and typically use X forwarding to run applications. I'm wondering what split I should use for allocating the RAM. I am not sure whether it is the server or the client's graphics memory which is "important" in this…
skeevey
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How do I make hostapd run at startup?

I'm running Raspbian Wheezy, on a freshly installed SD card: pi@raspberrypi ~ $ uname -a Linux raspberrypi 3.18.11+ #781 PREEMPT Tue Apr 21 18:02:18 BST 2015 armv6l GNU/Linux I wanted to make my Raspberry Pi a Wifi access point, so I followed the…
user31708
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Why doesn't my Logitech K400 keyboard/mouse always respond in raspbmc?

I have a Logitech K400 wireless keyboard/mouse that I use with my Raspberry Pi (the new 512MB model). I have Raspbmc installed. I'd say about 50% of the time when I boot the device, the keyboard and mousepad do not do anything. I can still use the…
Luke
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Accessing gpio pins using c program in raspberry pi

I am using raspberry pi with Debian Wheezy 18-09-2012 image. I can access gpio pins with Wiring pi tool. But I would like to know is any other method that we can access gpio pins directly without wiring pi? When I run the following command on…
sumith
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