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Incorrect values coming from 4-20mA ADC receiver

This is what I have. Raspberry Pi3 i2c shield. https://store.ncd.io/product/i2c-shield-for-raspberry-pi-3-pi2-with-outward-facing-i2c-port-terminates-over-hdmi-port/ 1-Channel 4-20mA Current Loop ...
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11 views

Run 2 raspberries simultaniously with precise timing

For my project i would like to make 2 dataloggers with 2 raspberries that read out data simultaniously with very precise timing. I already have the code for one a logger, but i can't really find ways ...
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1 answer
18 views

Raspberry pi 4 is not booting with Disk image that is working on Raspberry pi2

I am new to this project. The project was developed in 2015 using Raspberry pi2 and a 7' touch display. The disk image works perfectly on Raspberry pi 2. I tried to flash the disk image to an SD card ...
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  • 1
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1 answer
6 views

Pi Pico giving error when trying to enable custom hid device

The following is my boot.py file. It's a copypaste from adafruit site. import usb_hid GAMEPAD_REPORT_DESCRIPTOR = bytes(( 0x05, 0x01, # Usage Page (Generic Desktop Ctrls) 0x09, 0x05, # ...
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1 vote
0 answers
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ssh error : kex_exchange_identification: read: Connection reset

I am new to Pi and using the command line. I am trying to set up my Pi headless connected to my iPhone hotspot, I have downloaded the Raspberry Pi Imager on to SD card and used it to enable SSH and ...
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17 views

How to install pip2 on Raspbian bullseye?

I cannot use pip2 on my raspberry pi. I have Raspbian installed. More information of the version of raspbian I run: soldy@raspberrypi:~ $ cat /etc/os-release PRETTY_NAME="Raspbian GNU/Linux 11 (...
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On Raspberry Pi 4 with Ubuntu 22.04 don't work ioctl

I have Raspberry Pi 4 (aarch64 Cortex-A72) with OS Ubuntu 22.04 LTS 64-bit installed. I try read frame from webcam. When I run this code: if (ioctl(fd, VIDIOC_DQBUF, &buf) < 0) { std::cout &...
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Raspberry Pi OS root filesystem on a LVM LV

Yes, I have seen the previous answers to this sort of topic, but, they leave me a little bit confused. For example, in here, the answer talks about modifying /boot/config.txt to load an initramfs with ...
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How to open the Port from only one service

I've a raspberry pi 4 where I have some services running. One of the service (for example, localhost:5050), it displays some data and I want to have access to that outside of my local network. I don't ...
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how to run terminal commands with python [closed]

I am trying to run this terminal command from a python script export DISPLAY=:0 here is my code import subprocess subprocess.call('export DISPLAY=:0') I am getting this error Traceback (most recent ...
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1 answer
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Powering GPIO-interacting sensors with external 3V3

I am using a Raspberry Pi Zero, with an x706 PSU hat (2 x 18650 batteries). The X706 PSU is charged by a good quality, stabilised 5V power supply unit providing up to 3A. The Pi is hooked up to many ...
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Raspberry Pi Pico not booting after power outage

My Pi Pico is working fine when connected to the laptop and running the program. It is also connected via Pin 39 (VSYS) and ground. When I unplug the usb the Pi keeps running without issue. However, ...
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1 answer
23 views

Make rasbian a rolling distro by changing the sources.list

Been reading. I found out that in debian you can make it a "rolling release" by changing the distribution name to "test" (or something like that, not quite understand). Is there a ...
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  • 103
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0 answers
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unknown control 'rotate'

i have recently purchased raspberry pi camera Rev 1.3 and I'm trying to rotate it to 90 deg then its not able to rotate its just rotating it to 0 deg or 180 deg below are the command that I have used ...
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1 answer
20 views

Boot on Live Linux (USB) with command line of SD Card Raspbian

I would like to be able to boot on a live linux contained in a usb key connected to my Raspberry PI, from the terminal of my primary Raspbian contained on the SD card. The goal is to be able to ...
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  • 103
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0 answers
14 views

External wifi adapter not getting detected after reboot in Raspberry Pi (hostapd.service failed)

I was trying to setup a wifi mesh with raspberry Pi devices.Using this tutorial. I have used Linux Raspberry Pi OS. uname -a result: raspberrypi 5.15.32-v7+ #1538 SMP Thu Mar 31 19:38:48 BST 2022 ...
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  • 1
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rpc failed, curl 56 GnuTLSrecv error (-54)

Hi guys my goal is to create an opencv directory and clone opencv and opencv_contrib on a raspberry pi this is why I entered the following command: pi@raspberrypi:~/opencv $ git clone https://github....
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Can I plug a raspberry pi directly into the usb port of an offline computer, and automatically share them to a network folder over wifi?

This may be a naive question, I've never tried this before. I work in a lab where there are 20+ PCR machines each connected to a local, off-network PC hard drive & monitor which run software for ...
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  • 1
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0 answers
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Problem setting up Rpi Camera

So, I'm a beginner trying to use the Rpi's camera. I've plugged the camera in the correct way, but when I run the command $ libcamera-jpeg -o pic.jpg It returned this ERROR RPI raspberrypi.cpp:1812 ...
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Why I cannot use arduino's ftdi chip for serial console? [closed]

Because I have no FTDI cable for my raspberry pi, but I have a leftover arduino I thought to uise the arduino's serial chip by placing the normal Mcu into a boot loop. The connections I did are: As ...
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Raspberry Pi 4 b 8GB RAM Speaker Jack works perfectly with Raspbian, but either no audio or static noise Windows 10 Suspect IRQ Conflict

I have read a lot of postings but not one has addressed the problem, everything from typing commands to pulling the 3.5mm plug out a little because its too long, try different types of plugs (stereo ...
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0 votes
1 answer
10 views

Unable to Rotate Display

I recently purchased an 8.8in display from AliExpress (8.8inch IPS HSD088IPW1 Long strip display Stretched Bar HDMI compatible Display Aida64 monitor USB 5V Power Second Display Case) (https://www....
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28 views

What can I do to get the Pi4J library to work with Java?

I am trying to get the Pi4J library to work on my Raspberry Pi 4. I just wrote a simple blink program. It is not toggling the pin as it should be. Here is the simple program. I have compiled it, and ...
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  • 1
1 vote
2 answers
27 views

python-numpy no installation candidate

i want to install the command sudo apt-get install python-dev-is-python2 python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev and the output is Reading ...
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16 views

Raspberry PI not accessible from another device

I hosting a VS code server on my PI. I can go to 127.0.0.1:8080 on my PI and the website loads fine. When I try to go to http://raspberrypi:8080 I cannot connect. Here are some things I've tried: ...
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  • 103
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1 answer
26 views

PI4 Won't boot green led flashes 3 long 3 short I2C error

Everything was fine with my pi4 until yesterday that didn't boot. I checked the led lights and gives me 3 long and 3 short flashes. I checked in the docs https://www.raspberrypi.com/documentation/...
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1 answer
15 views

access raspberry via computer or external monitor

I want to programm a selfdriving car with visual recognision therefor I will later use opencv4. When connecting the Pi via computer I have a problem concerning the remote desktop connection and vnc ...
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18 views

Unable to start eth0 interface on raspberry pi4 model B [closed]

I could not find any useful resource. How to restart eth0 properly. I'm running ubuntu server 22.04.1 on raspberry pi 4 model B. I tried running sudo ifconfig eth0 up it did not work. eth0: <NO-...
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What raspberry pi model to buy for home virtual assistant?

Good day everyone, as title said, I'm intended to buy a raspberry pi in order to make a home VA for myself. I have tried searching around internet to see if there is any other recommendation for what ...
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Using RPI Bluetooth as Android Smart Lock trusted device [closed]

I have a Raspberry Pi Zero at home, and would like to use it as a Smart Lock trusted device for my Android phone. Essentially, if my phone is within range of the RPI, it should remain unlocked. But, ...
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Raspberry pi 4b won't boot. Red led lights up but green led dead

So I've been using my pi4b for a couple of days and I was trying to run some open cv python programs on it when it suddenly go disconnected(I use the pi via putty and VNC viewer). Ever since that the ...
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0 answers
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RPI and SNMP with python script

I am encountering some problems that I need some help figuring it out what is going on. After creating an example given on another forum I decided to create my own OID on my Raspberry Pi SNMP service. ...
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  • 1
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0 answers
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bluetoothd CPU usage constant at 100 %

I've had this problem for a few months where the Pi 4 gets very hot to the touch, and it invariably turns out that bluetoothd is stuck at 100 % CPU usage, saturating one core. Currently htop tells me ...
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  • 145
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0 answers
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Partitioning Disk and Filesystem setup on Ubuntu Images using cloud-init

According to the cloud-init documentation using the user-data configuration one may be able to partition the disk, see cloud-init's Cloud Config Documentation as well as setup up mount points. I have ...
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-2 votes
0 answers
19 views

PICO Serial USB Print improvement

I figured, that the "printf" function is quiet slow. I was wondering if there is an alternative that works faster. On my research i found a function in Micropython that seems to do what i ...
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  • 1
1 vote
1 answer
36 views

Should the lxpanel Updater be used for the kernel and bootloader?

TL;DR: As of this writing, the lxpanel Updater applet somehow only updates the kernel modules without changing the system release. I want to know why, and point out that apt resolves issues. Backstory:...
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  • 11
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1 answer
30 views

Fast question: I want to know what class is my sd card? How to do?

A fast question: I want to know what speed class is my sd card? How to do? Using dmesg show those info mmc0: new ultra high speed DDR50 SDHC card at address 0001 is possible to know the speed class ...
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  • 103
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0 answers
9 views

WiFi splash page that can be enabled or disabled by another script

I’ve seen a few posts and tutorials showing how a captive portal could be setup to authenticate users and also be shown to new users, however, I’m looking for a way to make a captive portal appear ...
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  • 11
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0 answers
16 views

How to lock the screen (not log out) without stopping any processes

I have an Rpi4b running rasbian and it records continuously from a video input card, and runs a couple of Pythonscripts upon boot. It doesn't have a screen, it's supposed to be completely autonomous, ...
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0 answers
27 views

What determines SD card write speed when creating images? [closed]

...or, alternatively, what am I doing wrong when creating an RPi image? I'm testing SD card writes use the Raspberry Pi Imager. I'm using two test images: The Ubuntu 22.04.1 desktop image ('64-bit ...
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  • 1
0 votes
0 answers
20 views

Enable sleep (CPU and HD) for Raspberry Pi Desktop on Mac

I have Raspberry Pi Desktop (Bullseye July 2022) installed on a 2007 iMac and it runs great. While the display goes to sleep ("screen blanking" was enabled by default) the system continues ...
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  • 111
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0 answers
28 views

Wifi disconnects after 6 hours on Raspian 11 (pi zero 2W)

I've got a Zero 2W running up-to-date Raspian (bullseye) and homeassistant Core. After 6 hours (give or take a minute, but pretty exactly) of runtime, the on-board wifi crashes and does not reconnect. ...
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0 answers
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How to read files from a SD card connected to ESP32 an then transfer/upload/send them with Micropython to Raspberry Pi?

I am working on a project, basically my proposal consist in a solution designed under server/client paradigm, on host side I have mounted an Ubuntu Server 20.4 LTS (64 Bits) on a raspberry pi and ...
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0 answers
13 views

Raspicast will not play shared videos nor does it display images

I have a samsung galaxy ultra s21 with raspicast installed. I am able to play videos that i've made using my phone on my TV. But i'm unable to play the youtube videos on my TV using raspicast. When i ...
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  • 101
0 votes
0 answers
19 views

Is it possible to overwrite scripts? (OTA Update)

I'm having a hard time finding information about remote updates on PICO W. I watched a bunch of videos demonstrating how MicroPython can be used to manipulate the flash storage - so would it be ...
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0 answers
25 views

OpenCV is getting slow in Raspberry pi 4, 8gb

Here is have made a project attendance system, for which I have trained a model and used the .h5 file to make the real time Prediction using opencv. so if the person face is detected then his name and ...
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-1 votes
1 answer
28 views

New to PI-Automatically move files from sd card to Syncology NAS

My goal: To have video copied from an SD card that is inserted into a Pi 4B using a USB SD Card reader copied to a network share and put in folders based on dates. My scenario. I come home from ...
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0 votes
1 answer
44 views

My Raspberry Pi 4 model B will not drive a Dell 1280 X 1024 60 Hz display

Dell E170Sc 1280 X 1024 60 Hz vga displays are available for cheap on Ebay. I accept that (besides using hardware adapters) I will have to modify a config file to get my RPi to drive the display ...
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28 views

poorer quality and jagged lines issue when rotating camera

I am capturing video from my raspberry pi camera using v4l2rtspserver, but I need the image to be rotated 90 degrees. Rotating it makes the image appear to have less resolution and there is an ...
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  • 101
0 votes
0 answers
33 views

Raspberry Pi 2: Inactive Ethernet & USB

Couldn't SSH into my Pi 2 as usual. It's running the latest Arch Linux ARM and is used to self-host a few things, though I doubt this matters here? It does boot just fine. Can see the usual TTY login ...
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