Los Alamos labs looked at powering a huge cluster of RPi to cheaply simulate their supercomputer cluster . Out of that came the Bitscope blades which will mount 4 Rpi per blade and host IIRC ten blades in a single rack.
It might be worth a look. Each blade is capable of delivering up to 4A current and is compatible with DC power sources ranging from 9V to ...
The official Power Requirements of the Pi 4B is 5v, 3.0A - I.e. a total of 15W maximum power requirement from each of the Pis, so a 60W USB power supply, or larger, would be ideal. This is a maximum, as they acknowledge with:
We recommend a 2.5A (2500mA) power supply, from a reputable retailer, that will provide you with enough power to run your Raspberry ...
I've got a RP4 for my daughter and want to change the splash screen...
It's the boot up screen and what it has configured. You can customize the boot up screen as you mentioned by this link.
However, if you want just add a simple picture/image, check this link out which is telling you to install fbi package.
I bought a router with AES-NI hardware support (Asus RT-AC86U) at a good price running now my VPN. Works very fine and faster than VPN on Win10 PC. Fortunately, and maybe also surprisingly, my iDevices and the PC can not connect to VPN at the moment due to successful great firewall blocking but the router can! The Bridge + OpenVPN way was too difficult for ...
You can install the motion package on your Raspbian Buster to stream the camera's frames. Simply install it by apt-get install motion.
After the installation, try to configure it by changing values on /etc/motion/motion.conf. If you just want to stream the frames without any feature else, try these lines there:
Buy a USB hub for charging (Anker, Belkin, etc.) and use that. No need to go all the way to the wall for multiple PIs.
This guy built an interesting stack including a USB powered network hub. https://makezine.com/projects/build-a-compact-4-node-raspberry-pi-cluster/
Docker may help you. In this case, you have two choices. You can run the image file which you have read from SD-card to a Linux/Windows docker environment. I didn't test it on windows but the link below may be helpful if you install a Linux machine on your MS Hyper-V:
How to Build and Run ARM Docker Images on x86 Hosts
On the other hand, you can turn ...
Raspberry Pi uses an ARM processor, your MS Windows machine uses an intel or amd processor so with a virtual machine manager (VMM) you cannot use the hardware supported virtual management of the machines processor. You have to use full virtualization with also emulating the processor. QEMU is known to support this but it is also known that it is annoying ...
budgie-desktop is available from the default Raspbian repository. This means it should be installable without worrying about dependencies about other needed packages. This is why we use the package manager environment (apt, apt-get, dpkg etc.). If you look at the description of the package you will find:
rpi ~$ apt show budgie-desktop
--- snip ---
This is most likely related to the bootloader settings. Setting POWER_OFF_ON_HALT=0 or WAKE_ON_GPIO=1 will keep the 3.3V line powered after a shutdown. The Ethernet chip is powered with 3.3V, so it will remain on indefinitely. You can see active bootloader settings in Rapsbian with vcgencmd bootloader_config.
This is not thoroughly documented anywhere as ...
I do not have the ralink rt2870 USB/WiFi adapter but here are some general ideas I have tested with the built-in WiFi device that you should also verify with your adapter. How to set the txpower on a RPi 3B+ I have shown at Restrict WiFi range of Pi 3b+. It also works on a RPi 4B.
If I do not have a valid /etc/wpa_supplicant/wpa_supplicant.conf file, I get ...
From your statements:
[The] "Pi stopped being detected over network"
[You] "gave a static address to my pi"
It appears you're describing a DHCP issue. Sounds like your Pi is not being assigned an IP from the router's DHCP server.
It further appears that you proved the Pi's Ethernet port is working from your statement:
When I understand the objective correctly, the task is to capture data. For that purpose, you probably set your Wi-Fi interface into monitor mode and capture the frames being received.
If that is correct, fiddling with the Tx power (=transmit power) won’t help at all. You would either have to change the receiver sensitivity or the attenuation of the ...
Kazam is another great screen recorder. It's graphical, easy to use, and has a ton of features.
To install it:
1) Open a terminal (click on the raspberry icon in the task bar, go down to Accessories, and then click on Terminal)
2) Type in sudo apt-get update then sudo apt-get install kazam
3) To run it, you can launch it from the taskbar (you'll find it ...
recordMyDesktop is here for you. It captures what you are watching on the screen and also saves all audio input/output.
You can use it by the terminal and also it has a GUI like the image below:
sudo apt-get update
Install the package:
sudo apt-get install recordmydesktop
This error also shows up on the Raspberry Pi 4 platform if the firmware drivers are corrupt or missing. An easy fix would be to reinstall them.
sudo apt update
sudo apt install firmware-brcm80211 --fix-broken
All Raspbian versions come with this driver - and many others. See apt search ^firmware-* for all available firmware drivers.
Earlier versions of ...
The first step (which in retrospect didn't help) is to configure your bootloader with POWER_OFF_ON_HALT=0 and WAKE_ON_GPIO=1 (I think the latter forces the former). Your RPi will never be fully shut down in this way, but it won't power down during a reboot either.
The next thing you could try is updating the bootloader with sudo rpi-eeprom-update, and ...
You can power any Raspberry Pi via the 5V pins on the pinheader (Pin 2 + 4) or by soldering to the testpads (Tp1/Tp2/Tp3). Be aware that the pinheader is unfused and that you need to provide regulated 5V at up to 3A to the RPi4. You should use minimum 24AWG/0.2mm2, preferably thicker gauge wire, especially if wires are long.
I have soldered wires directly ...
One possible problem may be the DHCP client. It will always get an ip address and network configuration (DNS server, gateway, default route etc.) on boot up. When the lease has expired the DHCP client may have a problem to renew it. If it cannot renew its ip addres then it will configure a link-local ip address 169.254.197.68/16 which does not fit to you ...
I found an answer to my own question - it's even official documentation. Right here is a guide of moving all data from SD-card to USB-device and then boot the boot files from SD bot all other files will be run from the SSD USB device.
The link to the guide (work-around): [https://www.raspberrypi.org/forums/viewtopic.php?p=1230182&fbclid=...
Yes, I would recommend Orca which is now supported on Rpi3/4 buster release 2020feb05. JAWS and NVDA are also good, but they are not free.
Raspberry Pi's Raspbian gets new features: File manager, Thonny updates, Support for Orca - Liam Tung 2020feb11
This Raspbian release brings accessibility improvements to the desktop in ...
An OS image is an abstract category that does not map 1:1 with filesystem or partition. Sometimes they are simply root filesystem images because that's all they have to be, in which case such an image is intended to be written to a singular partition and does map 1:1. We might more specifically call this a "filesystem image".
A Raspberry Pi OS image is ...
Maintain a list of GPIO event times, e.g. a list containing a GPIO number, a time, and a new level for the GPIO.
GPIO Time Level
23 10.0 1
23 14.0 0
15 15.4 1
23 16.2 1
15 17.4 0
23 20.2 0
Run a main loop which executes regularly, say 10 times a second. Check if events are due. If any are process the event and then sleep for the ...
I want more speed, I wanna be able to upload large files to my webpage
quickly and I think USB 3.0 + External SSD with Exts4 on it will do
the trick nicely.
Mount your external drive to apache2 web files path. At first, find out what's the name of your drive on /dev:
cat /proc/partitions | grep sd
You might see something like this:
8 0 ...
It's not possible. None of the Raspberry Pis have ever had a "low power" or "sleeping" or "not quite dead yet" mode. Hibernation doesn't exist in any OS I've ever run on a Raspberry Pi.
You have two choices.
Leave it running - it costs less than £5 to run a RPi for 366 days.
Get external hardware like a WittyPi2 to power down and restart on a timer ...
Raspberry Pi is made for education and to show newbies how hardware and software works. So the Raspberry Pi Foundation has taken any effort to make things as simple as possible to start with Raspberry Pi. Just follow its official documentation and most things will work out of the box.
Take a Raspberry Pi image of your choice and flash it to the SD Card. ...
Do NOT attempt to load ANY modules.
Add dtparam=watchdog=on to config.txt and Device Tree will load the module.
NOTE you also need to enable the watchdog service.
The best option is a good quality power supply, as cheap brands may
say they are rated at 2.4 amps when they don't actually supply that
much. Based on the numerous bad experiences I've had with 3rd party
chargers, I'd highly recommend buying the official one from the
Short answer: Looking for a 5V / 3Amps power supply, not the ...
Recover the /etc/network/interfaces by adding these lines:
# interfaces(5) file used by ifup(8) and ifdown(8)
# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'
# Include files from /etc/network/interfaces.d:
Then try to connect to your ...
Not direct an answer to your question but maybe a help to examine what's going on with the bootloader. The Raspberry Pi 4B has an EEPROM now where you can set a debug flag BOOT_UART=1 as described at Pi4 Bootloader Configuration. Then the boot loader will output low level debug information to the serial debug console on pins GPIO 14 and 15 so you need a USB ...
MagPi issue 90 also contains an article on overclocking (page 34 onwards). I am not suggesting you overclock your Pi 4, but the question suggests you may want to underclock it.
Some hints from the article:
The file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq shows the default clock rate, which is 600000 (600MHz). The actual clock speed can ...
Google it: online website analysis tool. There is a lot of website in this case and you can get a statistic of your site. In this link, I have tested your site. Check the result. The size is too large and the load time is kind of awful.
Is nginx faster and better than apache for the rpi 4?
The official raspberry pi website suggests LAMP which is Linux, ...
It has been shown that a Pi runs cooler if mounted vertically, as the convection currents flow better around it.
The magazine MagPi issue 90 contains an article about this. The print version even includes a free cooling stand. It should be easy to make one from e.g. wood or cardboard.
USB flash drives can reach up 33MBytes/s, but there seem to be some
limitations in the NAND itself so it will come down to the type of
stick you get. However, the sd-card bus speed can reach up to 20MB/s
read on the raspberry pi. So, the better choice here is a high-class
USB 2.0 USB flash drive.
On the other hand, the payment would be concerned....
Hey I recently figured this out. Installing Tensorflow requires some extra steps on the Pi's ARM architecture but it wasn't that bad. Let me know if this works for you!
This is how I installed tf 2 on my Pi 4 with Python 3.7.4
Make a project directory:
Make a virtual environment:
python3 -m pip install virtualenv
The same issue happened to me today, so I started finding a solution and found your question.
This post helped me https://www.raspberrypi.org/forums/viewtopic.php?t=34061.
Open your config.txt file from the boot and the below lines.
Try the alternate HDMI port. It worked for me.
You should check the SoC temp w/ vcgencmd measure_temp. If it is < 70 ℃ (which is quite warm to the touch), everything is fine -- in fact it's fine upto 80-85 ℃, at which point the CPU will be throttled to reduce the heat.
It will be uncomfortable to touch at that point.
Is it possible somehow to not let my Raspberry Pi plugged in overnight but to use ...
Answering for posterity since the power budget is a moot point:
No, this switch will not work as it is NOT standards compliant 802.3af (or the newer 802.3at) PoE. It not working is actually best case, the non-compliant power may actualy destroy whatever you plug on the other end.
Digressing briefly to shame Ubiquity who is otherwise great, this switch ...
Hey I recently figured this out. Here's a YouTube video I made giving the step-by-step: https://youtu.be/GNRg2P8Vqqs
Installing Tensorflow requires some extra steps on the Pi's ARM architecture.
This is how I installed tf on my Pi 4:
Make your project directory:
Make a virtual environment:
python3 -m pip install ...
You shouldn't manually update the resolv.conf, because all changes will be overwritten by data that your local DHCP server provides. Therefore, the network manager of Raspbian Buster has configured by /etc/dhcpcd.conf. Every configuration of this config file always is overwriting to other network config files on the OS.
All you need is that you should ...