All Questions
35,576
questions
0
votes
1
answer
10
views
What is up with the different repositories and URLs?
I've got 2 rpis running bullseye, one recently installed and one image from a couple of months ago. The sources.list file changed dramatically.
My old installation:
# sources.list
deb http://raspbian....
- 1
0
votes
1
answer
8
views
Ubuntu minimal desktop installation on ubuntu server fails
I have a Raspberry PI running ubuntu server 22.04. Now I wanted to install a desktop environment with the following command:
sudo apt install ubuntu-desktop-minimal
But then I get these errors:
E: ...
0
votes
0
answers
13
views
How to use 'bcm2835' to control 'PmodAd1' so that he can at least 500KSPS sample rate?
my device is 'raspberry pi 3'
I am using 'PmodAD1', a 12bit ADC with 1Msps sampling rate
https://digilent.com/reference/pmod/pmodad1/start
Due to linux's 'spidev' system, my sample rate is compressed ...
0
votes
0
answers
16
views
PIO vs DMA for PWM audio output [closed]
In order to turn audio data, stored in an array on flash, into PWM audio output, I believe Pico's RP2040 gives me - apart from bit-banging - these two options:
DMA
PIO
What are the pros and cons of ...
0
votes
2
answers
18
views
(Pico) USB serial connection having noise?
I'm having some trouble trying to make a simple USB IO demo to test the Pico. Apparently, the USB serial connection seems to be noisy, and always puts something into the UART buffer even though I am ...
0
votes
1
answer
23
views
Unable to login unless external hard drive is disconnected
I had set up my Pi 3b as a NAS with the help of an external hard drive, powered by a USB hub. This worked for a week. Today after boot, I'm seeing the message:
You are in emergency mode. After ...
0
votes
1
answer
18
views
bcm2835_spi_begin failed. Are you running as root?
I use bcm2835's mcp3008 sample program to export to .so
Then use ctypes to draw .so in python
But in the process of compiling python, the following error is thrown
bcm2835_spi_begin failed. Are you ...
0
votes
1
answer
59
views
how to power motors correctly on raspberry pi pico
I was using my raspberry pi pico and testing motors, and it worked just fine(pins was in GND + 3v3 pins). Then I wanted to use On/Off function in C, And i used the pin GP28_A2 to use it. But it wont ...
- 9
0
votes
0
answers
13
views
Raspberry Pi 4 does not boot with 3 devices connected to USB
I have connected three devices to my Raspi4 USB: Logitech wireless gamepad dongle, and YDLidar-X4, and Arduino UNO.
The YDLidar-X4 is separately powered with 5V supply, the Arduino is separately ...
- 1
0
votes
0
answers
15
views
I want to control the databases stored on my rpi from my windows pc [closed]
I have installed mysql-workbench on my windows pc and I also have installed mariaDB-server on my raspberry pi4. I would like to design those data bases which are stored on my rpi from my windows pc, ...
0
votes
0
answers
8
views
USB for KNX detected but not recognized
I'm using a Raspberry 3 for some home automation.
I installed openHAB 2.5.5-1 that runs on top of Raspbian GNU/Linux 10 (buster).
I use a device (OWL CM160) connected to the USB to record on a remote ...
- 1
0
votes
0
answers
16
views
Weird artifacting results in green gibberish on some applications but everything else is fine?
I've seen the following corruption before on programs usually on Raspberry Pi, but it's doing it again and I'd at least like to know the cause. This is Ubuntu 20.04 on a Raspberry pi 4, 4GB edition. I'...
- 341
-1
votes
1
answer
16
views
Pigpio Hardware PWM_unable to write frequency above 5Khz
I have been using the pigpio library as a modified spi interface to send and receive serial data. I use Chip Select, Clock, and Data Lines but i am using "bit-banging" for the timing between ...
- 1
0
votes
0
answers
36
views
How do I calculate the transmission of a mobile robot?
I have some questions about implementing a mobile robot.
I have an old construction mobile robot wherein this robot the main controller has been removed, and I put in its place a Raspberry Pi 4.
I ...
- 1
0
votes
0
answers
33
views
C programming - Cannot open /dev/ttyS0 in blocking mode
I am trying to open /dev/ttyS0 in order to write over serial GPIO pin 8. I am using the Raspberry Pi Zero W and noted something strange. When I try to open dev/ttyS0 in nonblocking mode, I am able to ...
- 1
0
votes
1
answer
21
views
raspberry pi pico to pc communication
I have a raspberry pi pico and want it to execute files on my windows pc(for example: if I press a button it opens a file). Because I am new to microcontrollers I have no idea how to do this. there is ...
0
votes
0
answers
14
views
EXIF metadata with libcamera
Why is libcamera-still not saving basic EXIF metadata?
How can I tell libcamera-still to do that?
I'm capturing photos with libcamera-still. Some EXIF metadata is stored in the file, like ISO and ...
- 103
0
votes
1
answer
23
views
BULLSEYE unable to run chmod etc
$ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
...
- 1
0
votes
0
answers
15
views
I have hosted motion on a rasberry pi how to I send the feed to another public webserver
I have hosted motion on a local network raspberry pi how to I send the feed to another public webserver as I do not want to get users accessing my network for safety reasons. any suggestions are ...
1
vote
3
answers
44
views
Simple float switch sensor frying GPIO pins, while the other doesn't? Hydroponics system
I'm building this mostly finished hydroponics system. It's a surge tank build.
Surge tank looks like:
(that's nutrient water, it's got electrolytes that plants crave)
Inside that bucket are two ...
- 113
0
votes
0
answers
15
views
Working on UV4l to get the Streaming Server running
I used the following command to start the streaming server
sudo uv4l --external-driver --device-name=video1 --server-option '--port=1226'
upon this command I have the following output in my terminal
&...
0
votes
1
answer
13
views
Storing Database or installing program on USB drive
I am planning to use by old Raspberry Pi Model B for webscraping with a python script. The data stored will eventually get huge (in GBs). So my SD card will run out quickly. I have a larger capacity ...
1
vote
0
answers
29
views
Network Sharing From Linux PC through ethernet
I have a Pi connected to my computer (running linux) through ethernet. I need this configuration for other purposes as the raspberry collects data from sensors and the data is sent through ethernet to ...
- 11
-1
votes
0
answers
12
views
Invisible window on 3.5" touch screen
I've connected Kedei 3.5" touch screen to raspberry pi 4, some times when running an application the window is invisible as seen in this screenshot:
another example is that the main raspberry pi ...
- 1
0
votes
0
answers
21
views
problems with bullseye libcamera [closed]
Does everybody agree that bullseye and libcamera is a complete disaster or not? It seems that there a lot of people trying to use bullseye but are having problems getting a simple camera to work
I am ...
- 1
0
votes
0
answers
10
views
JPEG decoding using gstreamer on RPI 4
I have the following pipeline:
gst-launch-1.0 v4l2src device=/dev/video0 ! 'image/jpeg, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1' ! jpegdec ! ...
- 13
0
votes
0
answers
30
views
How can I interpret this GPIO Alt-Modes?
I have a Hyperpixel 4.0 Touchscreen, which i use one my Raspberry PI 3b+ This Touchscreen is attached directly on the 40 GPIO-Pins and a few Pins have some special Alt-modes. I analysed the alt Modes ...
0
votes
0
answers
23
views
How can I modify my sampling rate using methods other than DMA?
The ADC module PmodAD1
I am currently using with 1M sampling rate and 12bit resolution
I use spidev as a library to connect to ADC
But it seems that he can only sample up to a sampling rate of 20KSPS
...
0
votes
0
answers
19
views
bluetooth network traffic monitoring
Is there anything that I can use to monitor my Bluetooth traffic just like the resource monitor in windows? I encounter nethogs in raspi but it only monitors wifi network. I want to know the B/sec of ...
0
votes
0
answers
18
views
How to use adc to receive 40khz and 43khz modulated signals?
I am currently using thePmodAD1 in this mod for signal reception
This is my code
from DesignSpark.Pmod.HAT import createPmod
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
adc =...
0
votes
1
answer
11
views
How to grab jpg from IP Camera with raspberry [closed]
I need to grab programmatically one single image (jpg) from a IP Camera in my network that stream the flow through RTSP.
The reason because I need just one single image it's explainable because I need ...
- 101
0
votes
0
answers
17
views
Disable HDMI at boot, then re-enable later
Here's the desired scenario:
System is turned on
Pi boots (bullseye) with HDMI off (fully off, not just outputting a blank stream)
Later, Pi activates HDMI and starts outputting video
Currently, I ...
0
votes
1
answer
32
views
How to interface Raspberry pi B with 433 Mhz Transceiver kit (WiringPI is defunct)?
I picked up a 433 Mhz transceiver kit so I can mess around with a remote controlled power outlet from my PI. Thing is, the two the examples I find for it use the WiringPI library which appears to be ...
user146776
1
vote
0
answers
30
views
Not getting an GPIO output
I am trying to light a led with the raspberry pi 3b, but I am failing to get an output.
I connected the LED to physical pin #11: [img]https://i.imgur.com/TYeJc10.jpg[/img]
And to physical pin #6(...
- 11
0
votes
0
answers
10
views
NFS4 mount not working on 64Bit
I have a Pi 400 with the latest 32 bit buster image, fully up to date. Mounting several NFS4 and CIFS shares from my QNAP NAS (same Network and IP range) works without any problems. Now I've put the ...
- 1
1
vote
0
answers
23
views
How to configure the watchdog
I tried to configure the watchdog on several Pi's with the latest Raspbian by adding "dtpatam=watchdog=on" to /boot/config.txt and adding a file called /etc/watchdog.conf with:
watchdog-...
- 33
0
votes
0
answers
13
views
code not detecting ads7830 even though i2cdetect shows the address
I am trying to run Motor.py code from Freenove. I can see that my ads7830 IC is up and running
i@raspberrypi:~/Freenove_Kit/Code/Python_Code/13.1.1_Motor $ i2cdetect -y 1
0 1 2 3 4 5 6 7 ...
- 149
0
votes
2
answers
19
views
How can I read the current ALT-Mode of a GPIO PIN?
i have a Hyperpixel 4.0 Touchscreen, which i use one my Raspberry PI 3b+
This Touchscreen is attached directly on the 40 GPIO-Pins and a few Pins have some special Alt-modes.
Out of personal Interest, ...
0
votes
2
answers
44
views
Cannot SSH into periphery RPis from master RPi using python script automated from crontab: Host key verification failed
Project Overview
I have a series of RPi 3B+ which collect T/RH data using connected sensors. These "periphery" units collect data every 5 minutes, append the data to a CSV file that holds a ...
0
votes
0
answers
9
views
Connecting to mysql server with python tls
I am trying to implement TLS in mysql and everything works with in connecting to it except a python code in the raspberry pi.
the code looks like this:
import mysql.connector
import mysql.connector....
- 1
2
votes
1
answer
42
views
Raspberry Pi 3B+ board SMT component identification
i'm a college student so i cheaped out by buying a physically damaged RPi 3B+ planning to repair it myself (also as SMT soldering practice) but am having some difficulty identifying the damaged parts. ...
- 23
0
votes
0
answers
31
views
Simple UPS by directly connecting 4 NiMh accumulators to power bus? [closed]
I have a Raspberry Pi 4 Model B powered by PoE (using the official PoE hat). Unfortunately, it sometimes gets abruptly disconnected, which sometimes results in unrecoverable data corruption. So I need ...
- 101
0
votes
0
answers
25
views
I want the url of Motion WebCam Streaming Server to be changed
I'm streaming video with Raspberry Pi, webcam and Motion
One thing I want to do is change the format of the url where the streaming plays
It was originally 192.168.0.1:8081
I want to change it to 192....
- 1
0
votes
0
answers
37
views
How to get Wifi working an Raspberry PI 4 with Ubuntu Server 20.04 for ARM
Short story
PI is not connecting via Wifi. Errors of systemd-journal below:
journalctl -n
ubuntu kernel: ieee80211 phy0: brcmf_cfg80211_scan: scan error (-84)
ubuntu wpa_supplicant[573]: wlan0: CTRL-...
- 1
0
votes
3
answers
50
views
CAN bus from Raspberry Pi3+ to Arduino Nano
I am currently trying to add my RPi-3B+ to my CAN-Network. I successfully have a running CAN-Network with 10 Unos\Nanos. In the future the Pi should act as a command center and data storage. My ...
- 101
0
votes
2
answers
25
views
autostart keeps resetting
Im trying to add items to the autostart on desktop launch but the options just keep disappearing.
My file:
.config/lxsession/LXDE-pi/autostart
currently has:
@lxpanel --profile LXDE-pi
@pcmanfm --...
- 101
-1
votes
0
answers
24
views
how can i access the GUI through putty ssh
i can't find any answers on google and have resorted to here for answers
0
votes
0
answers
14
views
DSI Display not detected on reboot
Setup: Raspberry Pi 4 (8GB) running Raspberry Pi OS. 5" DSI Display and 7" HDMI Display.
From a cold-boot, the DSI display is automatically detected and works as expected.
During a reboot, ...
- 1
0
votes
1
answer
18
views
Arming an AreoStar ESC with Raspberry Pi to manage brushless motors
I am trying to set up a brushless motor so I can control it via python.
I have a AreoStar ESC and the manual says to enter the menu for the motor you must first set the throttle to 100%, then plug in ...
- 109
0
votes
0
answers
30
views
Detect motor running physcially
I'm using the pigpio library to run my motor in my Raspberry Pi like below.
ESC = 18
esc_pi = pigpio.pi()
esc_pi.set_servo_pulsewidth(ESC, 2000)
I'm wondering is there any way to detect the motor is ...
- 123