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1500 questions
12
votes
3 answers

ufw and iptables on buster

I've got a RPi4 and I'm trying to configure ufw. The problem is that I get this error ERROR: Couldn't determine iptables version The versions of iptables and ufw are iptables 1.8.2-4 libnftables0:armhf 0.9.0-2 libnftnl11:armhf 1.1.2-2 nftables…
miimote
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11
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1 answer

Does a two-port charger at 1.5A provide 750mA from each port?

So, I'm looking to buy this energizer charger: http://www.amazon.com/Energizer-Dual-Universal-Charger-Pc2-wa/dp/B004YZI1VW/ref=cm_cr_pr_product_top The 1 port product has 1A the two port product has 1.5A. Does that mean that I'll get 750mA from each…
EGHDK
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11
votes
7 answers

PulseAudio sink stuttering

I have installed raspbian on my Pi and configured a PulseAudio sink with the intention to stream all audio from my desktop to a Pi, driving the loudspeakers. I followed this nice description:…
farindk
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11
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5 answers

What is an easy way to electromagnetically shield a Pi?

My friend and I are working on a Civil War telegraph project, and we incorporated a Pi into the project, for reading and displaying the received code from the key. My friend created a period correct sounder, which relies on an electromagnet. …
fr00ty_l00ps
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11
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2 answers

Navigating through USB drive with "cd /myOtherFolder" causes "no such directory" error

When navigating the file system of my USB drive in the terminal, some weird things happen that didn't used to happen on my Raspberry Pi B+. I'm not quite sure how to articulate this, so I'll just show what is I open the command line and navigate to…
Henry Westfall
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11
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3 answers

Unsoldering elements from from rpi -> can't get solder to melt. Any tips?

So, SD Card connector on my raspberry pi broke down and can't hold the card well enough, so I'd like to solder a new card connector. While I'm at it, I'd also like to remove RCA and audio connectors, as I'm 100% sure I won't ever need these. So,…
user8642
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11
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1 answer

Why does the SHA256 of Raspbian file image never correspond to the one indicated on the website?

Every time I download Raspbian (last time Raspbian Stretch with desktop) I try to verify SHA256. However, every time the result is different from the one on the website, although I am quite sure the download was successful and without…
Francesco Boi
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11
votes
2 answers

Audio over HDMI - hello_audio.bin works but not aplay

I'm having problems getting audio over HDMI working correctly (running ArchARM). I have in my /boot/config.txt: hdmi_drive=2 I compiled hello_audio.bin and ran it with 0 and 1 as args, both work (through the TV and the jack) Sound over the analogue…
Munkeh
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11
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0 answers

How to install Python 3.7 with SSL?

I have compiled and installed Python 3.7 on my Raspberry Pi, but SSL is not working. These are the steps I took to install the new Python: Prerequisites: $ sudo apt-get update $ sudo apt-get upgrade $ sudo apt-get dist-upgrade $ sudo apt-get install…
swizzlevixen
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11
votes
3 answers

How fast can GPIO pins toggle?

I'm currently using Python's RPi.GPIO module to toggle some pins, and I want to know how quickly it can do this. I need the pins to be toggled on the schedule of a ~50 mhz FPGA clock, which I'm worried is too fast for the Pi (I need 8 pins toggled).…
auden
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11
votes
1 answer

Why do I always have to run apt-get update twice? Or do I?

Every time I run apt-get update, I get the following message (the exact duplicate package is different depending on the last entry in sources.list): W: Duplicate sources.list entry http://ftp.uk.debian.org/debian/ squeeze/main armel Packages…
Tom Medley
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11
votes
3 answers

WebGL does not work properly on Raspberry Pi Chromium Browser

I have a problem with WebGL on Raspberry Pi 3's Chromium browser. I did the settings required but nothing happened. Here is my information Device : Raspberry Pi 3 OS : Linux raspberrypi 4.9.80-v7+ #1098 SMP Fri Mar 9 19:11:42 GMT 2018 armv7l…
Mehmet Bayrak
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11
votes
4 answers

Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?

I think there might be a problem with my new Pi. I'm using the same power supply (purchased from PiHut for my previous 3B) in the new 3B+ but I get the rainbow screen and the red power light flashes in a particular pattern: 4 long flashes followed…
Shawson
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11
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2 answers

NOOBS recovery password

I have installed a new kernel, but for some reason, it won't boot. I generated the kernel.img with imagetool-uncompressed.py, but now my Raspberry Pi fails to boot. I have made a backup of the old kernel.img, and want to restore it. I need to know…
built1n
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11
votes
2 answers

Python script fails with 'ImportError' when run from rc.local

So I've tested that my script does attempt to run and I'm recording the error message of Traceback (most recent call last): File "/home/pi/steamFriendStatus_v0.3.py", line 6, in import telepot ImportError: No module named…
Purdy
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