Raspberry Pi Stack Exchange
Raspberry Pi Stack Exchange

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GPIO: Why wire button to ground rather than +3.3v?

In most examples I've seen of wiring buttons to GPIO inputs, the button is wired so that when closed, a circuit is completed between the pin and ground, producing a low input on the pin. A pull-up resistor is used to default the input value to high.…
howard10
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How do I get my bluetooth keyboard to pair automatically before I log in?

I asked how to install bluetooth, so I can use an existing mouse and keyboard. I was able to get that to work, but the keyboard ceases to function when the GUI is logged out. That means that I still need a 2.4Ghz keyboard to login, or to use the…
zenbike
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Can Python control normal Minecraft, or only the RasPi Edition?

My son wants to make a game in Python that is materialized in Minecraft. If he does that using the RasPi Edition, can that same Python code control the normal Minecraft on a PC? My guess is that Python sends commands to Minecraft rather than running…
Jim L.
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Failed to create MMAL component b'vc.ril.camera': Out of memory

I am trying to run a simple script that listens for a button click and then takes a picture. Once two pictures have been taken it compares the two using OpenCV to calculate the difference. I am running into this error when running my script followed…
Justin
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How do I restart Raspberry Pi from a remote system?

I have mounted my Raspberry Pi videos folder into my Ubuntu 10.04 system. I can paste different videos to mounted directory along with videos folder in Raspberry Pi whenever I require. The problem is I want to restart the Raspberry Pi every time…
Viswa
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Gigabit USB ethernet running at 100mb/s

I bought a small gigabit ethernet USB adapter, which works fine OOTB in a Raspberry Pi 3, but only at 100mbits/s. How can I make it run at full speed? ethtool: # ethtool eth1 Settings for eth1: Supported ports: [ TP MII ] Supported link modes: …
santiagozky
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Enabling ARMv8 on Raspberry Pi 3 B

According to this article I should be able to switch to ARMv8 on my Raspberry Pi Model 3B, but I'm getting "rainbow screen" after adding to config.txt the line: arm_control=0x200 Why is it not working? Is it even worth switching from ARMv7 to…
madneon
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How to get touchscreen right click on Raspbian Stretch

I am currently using Raspbian Stretch with a Waveshare 7 inch touchscreen, and I would like to get right click input (preferably with two finger or long touch). There appear to be no solutions for Raspbian Stretch, and I have tried to use solutions…
The Sleepy Penguin
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Raspberry as an I2C SLAVE

Does anyone know how to setup a Raspberry Pi 3 as an I2C slave (in C++)? Before someone answers saying that it's not possible, it is possible. Here is a link that says it is possible (pigpio documentation) This is the code I'm trying to use (from…
Sebastião
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ifup and ifdown do not work on raspbian stretch lite 2017-09-07-raspbian-stretch-lite.img

I just installed a clean image of the latest Raspbian Stretch Lite. Specifically - 2017-09-07-raspbian-stretch-lite.img ifconfig shows that my wifi interface wlan0 is detected and up. eth0: flags=4099 mtu 1500 ether…
saraf
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How to printscreen on Raspberry Pi?

I would like to screenshot the Midori browser and i've tried the following methods as mentioned HERE. Using Imagemagick which is pre-installed in Raspberry Pi. I pressed the printscreen key on the keyboard and attempt to paste it on that software.…
yvonnezoe
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Is the Raspberry Pi vulnerable to the KRACKs on WPA2 networks?

I have an updated RPI Zero W running Stretch. The research is stating that wpa_supplicant is vulnerable on all Linux machines. According to Debian patches are rolled out: For the oldstable distribution (jessie), these problems have been fixed in…
Janghou
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How to change user pi sudo permissions; how to add other accounts with different permissions?

Since I occasionally use my Pi over SSH, I have learned that it is dangerous to allow SSH to access sudo commands. Thus, I plan to turn off this permission in the near future. But, when I install packages I usually have to reboot. Currently, this is…
xxmbabanexx
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Open the network list with command line

I'm working with a Pi running Raspbian. Is there a way to open the network list with a command from the terminal? This is the list I mean: I have searched in the file ~/.config/lxpanel/LXDE-pi/panels/panel is defined the menu bar (sizes, icons,…
Francisco Javier Gil Blanco
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6 answers

Installed pyusb, still: 'ImportError: no module named core'

On my Raspberry Pi I installed libusb and pyusb via sudo apt-get install libusb-dev python-usb. But running some Python code (pyrow, to read data from a rowing machine) gives me this error at import usb.core: ImportError: no module named core This…
A. Goossens
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