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1500 questions
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2 answers

I want to switch between versions 2 & 3 of Python. Both are installed

If I double click on a .py file it opens "IDLE" (is there another way to open "IDLE"?), but the default python version is 2 when I select "run". I want to PERMANENTLY change the default version to 3 so that I don't have to switch versions every time…
John Foggitt
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RPi OCR or how to read a number from the camera

Tried googling first but could not find any interesting hits relevant to what i am looking for. The wild idea is to put a camera in front of an energy meter or watt meter display and read the accumulated total in the display, and process it down to…
chgus
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Default username/password for CentOS 7 on Raspberry Pi

What is the default username and password for CentOS 7 for Raspberry Pi?
Enayet Hussain
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1 answer

Raspberry PI Zero no HDMI output

I've bought a month ago a new Raspberry Zero to try this little toy. I'm already playing with a Raspberry and linux OS in general but this time i'm very close to give up. The problem is that this Raspy won't display boot messages, this is what i've…
Niccolo Lubello
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11 answers

No video on HDMI?

I just got my Raspberry Pi in the mail, and went to hook it up to my TV with an HDMI cable. I plugged in the cable (known to work with my cable box), a keyboard, and then power. A light comes on the Raspberry Pi, but no picture. Is there something…
Canadian Luke
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1 answer

How can I run Stella (Atari emulator) on the Raspberry Pi?

I am trying to run Stella, the Atari emulator that is in the Debian repository. If I run it from X, it's very slow and I am not able to use OpenGL acceleration. Plus, the full screen doesn't fit the screen of my TV properly (I am using the composite…
Alessandro Cosentino
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Do You HAVE To Use SDFormatter Before Installing NOOBS?

SDFormatter is often recommended to format the SDCard. https://raspberrypi.stackexchange.com/a/19928/39410 http://elinux.org/RPi_Easy_SD_Card_Setup#Using_NOOBS I have never heard of this software before using the Raspberry Pi. Is it critical to…
opticyclic
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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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9
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3 answers

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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9
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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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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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