RaspberryPi | projects done by me on Raspberry Pi
kandi X-RAY | RaspberryPi Summary
kandi X-RAY | RaspberryPi Summary
This repository will contain all the projects done by me on Raspberry Pi.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
- Setup the UI
- Translate ui
RaspberryPi Key Features
RaspberryPi Examples and Code Snippets
Community Discussions
Trending Discussions on RaspberryPi
QUESTION
I am working on a Qt application on my raspberry pi 4 and I want to create a dynamic variable and to use it in my Qt application , it is a counter and I don't want it to be reinitialized at zero on every execution of the application, I want to just use the address and increment the value on each execution.
so in my raspberry pi I created a variable
...ANSWER
Answered 2021-Apr-09 at 12:00The memory spaces of different processes on your system (e.g. the Qt application and your program with the counter) are mostly disjoint. Even when they use the same addresses - those are virtual, not physical, memory addresses, and get translated upon use, (typically) into addresses in physical memory.
That means that the Qt application does not, and cannot, have access to a counter variable in another process' memory space.
So... you will need another approach. Some possibilities:
- The Qt application communicates with your monitor mini-app over some some socket.
- No second process, but the Qt application locks a file, opens that file, reads the current counter from it, adds 1, writes it back, closes and unlocks.
- Use some existing utility/system facility which keeps track of execution statistics (I don't know of one personally, but it might exist, depending on which OS you're running).
QUESTION
I want to install the JDK 16 on a RPi 3B and I downloaded the Linux ARM 64 Compressed Archive from the Oracle site.
Every time I run the command to check the version of java I get the same error:
bash: ./java: cannot execute binary file: Exec format error
I already tried to untar it again and download the archive from zero, but I get the same error every time. Considering the RPi 3B not able to support the JDK16 for some reason, I downloaded and installed the Kit on a RPi 4 too, but the result is always the same. I used the checksum to make sure the downloaded archive was intact and it was.
Am I downloading the wrong package or have I missed anything important?
...ANSWER
Answered 2021-Jun-10 at 15:45It seems you are running a 32 bit ARM Linux (armv7l), you therefore cannot execute a 64 bit aarch64 JDK. You need to install the 32 bit version, the same way you installed the 64 bit JDK, or to install a 64 bit Linux distribution on your system.
QUESTION
I'm trying a very simple exmaple to create a shared library and link to it. The shared library is as follows:
...ANSWER
Answered 2021-Jun-09 at 15:01This is becuase you are using the -l
flag.
When you use this flag (Rather than specify a library specifically) it assumes a certain naming convention.
QUESTION
I'm trying to set up my environment to use Yocto's generated SDK to compile my out-of-tree module, but for some reason, I'm getting an error.
cp: cannot stat 'arch/arm/kernel/module.lds': No such file or directory
I'm using Poky distribution and meta-raspberrypi which is needed because I'm using the RPI ZeroW board. Apart from this everything works fine. I'm able to compile the entire image and load it on the board.
Here is the line I've added to local.conf
TOOLCHAIN_TARGET_TASK_append = " kernel-devsrc"
as I've found in the documentation.
Also below you can find the whole log from the compilation.
...ANSWER
Answered 2021-Jun-07 at 11:16Missing the module.lds file in the latest kernel. Apply the following source code as a patch in the kernel and build the image.
QUESTION
i want to add .h and .lib files to a own created recipe to the sdk. I use cmake to build my lib's, with the sdk i can build it. My recipe name is served. (i want to add the served https://github.com/meltwater/served as a own recipe). in my served_0.1.bb File i add following:
...ANSWER
Answered 2021-Jun-07 at 06:04Assuming that you have a recipe for served
which compiles without errors.
The step to add served .h
and lib
files to sdk is to add below line to local.conf
QUESTION
I'am quite new to python and I am developing a passport scanner with a RaspberryPi and the passport eye module. In the end it prints outs the outcome of the scanned image. However, I also want to print an outcome if the scanner isn't able tot detect a MRZ code.
I tried some things but couldn't figure it out, here is a example in short:
...ANSWER
Answered 2021-Jun-04 at 12:50From the official docs -
The returned object (unless it is None, which means no ROI was detected) contains the fields extracted from the MRZ along with some metainformation
Looks like the image that you are using returns None
. In line 2 when you call the to_dict()
on None
, it throws the exception 'NoneType' object has no attribute 'to_dict'
This can be fixed as follows
QUESTION
I'm trying to transfer image data from a camera to the raspberry pi over SPI using the spidev interface. The maximum buffer size possible is 4096, I need about 200,000. This suggested:
...ANSWER
Answered 2021-May-31 at 20:10From this:
add spidev.bufsiz=xxxx
to /boot/cmdline.txt
and remember to keep everything on one line.
QUESTION
I run a working Wireguard server with 2 Wireguard Gateways for Site-to-Site VPN and a couple of Mobile Devices with a Full Tunnel that are used occasionally. One of my Site Gateways is a RaspberryPi4 that I want to provide a WIFI-Access-Point that directly tunnels to the Wireguard Server. This RaspberryPi has working access to all connected subnets via the main Server, so Wireguard is setup properly.
I want to use my Raspi4 to roam the world and provide me a WIFI-Access-Point while any device that connects to it is directly routed into Wireguard and emerges to the web only from there. I used the standard gateway setup provided and my WIFI device can access the web but doesn't tunnel through Wireguard (yet).
I can't really find where I can configure where the access point is bound to, dnsmasq, apdconf or a simply iptables rule?
Example IPs
Server: 10.0.7.1, local network 192.168.0.1/24
Raspi4: 10.0.7.5, local network 192.168.6.5/24, WIFI 192.168.7.5/24
So far I haven't succeeded, ideas?
...ANSWER
Answered 2021-May-31 at 14:56Got it to work, took a few steps.
First I changed the Wireguard-tunnel on the RP4 to be a full tunnel, it was previously a split-tunnel, only routing the IPs of the other local LANs into the wg0 interface.
Working Full Tunnel:
QUESTION
I know that this might not be the best place to ask questions I wanted to ask but frankly even though I've browsed through a lot of resources I haven't found satisfying answers. I've been trying to learn how to use Yocto and therefore I've got some questions. (Btw if you know a better place to ask them please just let me know in a comment so I could the question there and remove this one, in order to not mess too much).
In Embedded-Linux-Development-Using-Yocto-Project-Cookbook I've found that the good practice is to create my own bsp layer. Is it true in the case when my new-custom-bsp layer would be depending on e.g. meta-raspberrypi? So the meta-raspberrypi would be like a base for my bsp layer?
Why should I define my own images?
What should be placed in bsp layer? Linux kernel version? Uboot configuration? Device tree? What if I have my own kernel modules? Should I put them in bsp layer? What if I have modules that handle not the hardware on the board itself but rather hardware that can be plugged in the board? Wouldn't be better to put them into my-custom-distro layer?
As for my my-custom-distro - what should be placed in this kind of layer? Running services? Loading drivers? User configuration?
ANSWER
Answered 2021-May-22 at 10:13Is it true in the case when my new-custom-bsp layer would be depending on e.g. meta-raspberrypi? So the meta-raspberrypi would be like a base for my bsp layer?
Yes. Yes.
Why should I define my own images?
Don't you want to control what is part of the image? You can use existing provided by the BSP layer if there are any otherwise.
What should be placed in bsp layer? Linux kernel version? Uboot configuration? Device tree? What if I have my own kernel modules?
As for my my-custom-distro - what should be placed in this kind of layer? Running services? Loading drivers? User configuration?
Whatever is needed to make it work on existing platform/board, so anything and/or everything from the above.
QUESTION
I got error when creating deployment. This is my Dockerfile that i have run and test it on local, i also push it to DockerHub
...ANSWER
Answered 2021-May-21 at 06:45You are trying to launch a container built for x86 (or x86_64, same difference) on an ARM machine. This does not work. Containers for ARM must be built specifically for ARM and contain ARM executables. While major projects are slowly adding ARM support to their builds, most random images you find on Docker Hub or whatever will not work on ARM.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install RaspberryPi
You can use RaspberryPi like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page