Questions tagged [pi-4]

For questions that apply specifically to the Raspberry Pi 4 and not other/all models.

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12 views

Raspberry Pi 4 GPU math

So there is support for Open GL ES 3.1, but how can I use it on the Raspberry Pi 4? Is there any other way to use the GPU for calculations such as fft and logarithm?
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19 views

Show desktop on boot without HDMI cable

I'm using vnc viewer for my pi 4 and it says 'cannot currently show desktop', because, from what I assume, is the fact that if it doesn't have an HDMI connection when it boots, it won't show the ...
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1answer
16 views

Error copying files permission denied | using the sudo command

I am trying to install a new cli onto my pi and when I run the installer script as sudo and I am getting a permission error saying it can't copy any files into /usr/local/bin/pd The error I am ...
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32 views

SPI communication between the Raspberry PI and 2 ADS1299 simultaneously

It is my first time using the SPI communication between the Raspberry PI and 2 ADCs.So can anyone help me reading data from the 2 ADCs separately and simultaneously that's mean each DOUT alone but in ...
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28 views

DS18B20 does not have a unique adress in /sys/bus/w1/devices

The problem: I am trying to use a RW1820 (DS18B20), to display the temperature. yet it does not show up in devices. Only w1_bus_master 1 appears. Setup: Raspberry Pi 4 1-Wire Temperature Sensor ...
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18 views

Ubuntu 20.04 KVM kernel for Raspberry Pi 4

I would like to deploy a VM from KVM template on Raspberry Pi 4 running Ubuntu server 20.04. The VM will be configured to emulate x86_64 CPU. Is there a precompiled KVM kernel for it? If not, how ...
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18 views

Audio output of Alexapi on raspberry pi only works with hdmi and not with speakers through the 3.5 mm audio jack

Alexa speaks and listens to my voice when I run the Sample App. However, I can only hear Alexa from an hdmi TV and not from a speaker even after trying the following steps. Even though the audio ...
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23 views

Unable to type an 's' in the terminal

I am presently trying to install Orca on a RPI4, and have a strange problem. When I open a terminal session, every time I hit an 's' I hear "Speech Enabled" or "Speech Disabled" ...
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2answers
34 views

How do I start VNC on startup of Raspberry Pi 4?

How can I run VNC on each boot? Note: I use TightVNC server and Raspberry Pi 4 and Raspbian Buster
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22 views

Converting from RPi.GPIO to circuit python digitalio

I didn't write this code (just made some modifications) but it was using a depreciated library so I'm trying to update to the official circuit python libraries and update everything for python3. This ...
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1answer
24 views

Raspberry Pi installer vs NOOBS

I have just bought a new Pi4 and want to start off with Ubuntu OS rather than with Raspberry Pi OS. I wasn't sure if I should use NOOBS or Raspberry Pi installer for setting up the OS on the microSD ...
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1answer
40 views

Raspberry Pi 4 hung on boot while powered USB hub is plugged in

I've got a powered USB hub with an ethernet port connected to my Pi. When the Pi boots with it plugged, the boot process hangs until I unplug it. This seemingly includes the clock, as /var/log/syslog ...
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1answer
48 views

Ethernet port on USB hub overrides on-board ethernet

I've got a powered USB hub with an ethernet port connected to my Pi, but I'm only interested on the USB ports, as it already has on-board ethernet. However, for some reason, when the Pi boots, the hub'...
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1answer
19 views

Servo Controllers, Servos, Power consumption

I'm looking at options for controlling multiple Servos I keep finding the same board, the PCA9685 Which is great, I see people using them for those small 9g servos, but what about servos that pull ...
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21 views

vlc python does not play a video in hdmi2

I want to run a video in my second monitor/projector using vlc pip3 install python-vlc and python3 in Raspberry Pi 4. I set the Fullscreen Video Device to HDMI-2 Tools --> Preferences --> Video -...
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2answers
41 views

Can you use 1 large SSD device for booting and data (2 partitions) on Pi4?

I want to use one partition for booting (RASPIOS) and one for the data files. The reasons I have are: 1- cost per GB on SSD devices is less and 2-separate devices causes more heat along with increased ...
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2answers
43 views

SSH “Connection Reset” immediately after Conncting

Ive been had my Raspberry pi 4 setup for awhile. Using it as a VPN, Plex, and basic Wordpress host. Ive been using SSH for awhile and its worked fine. Ive recently caused an issue where immidiatley ...
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22 views

Debug OTG on RPI 4 for g_midi?

I tried to set a RPI 4 in OTG device mode I added dtoverlay=dwc2 to config.txt I modified the cmdline.txt so it launches wc2 & g_midi I tried ,dr_mode=peripheral too I just tried replacing ...
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1answer
44 views

RaspberryPi4/Windows10 doesn't recognizes USB devices after boot

I've installed Windows 10 on my Raspberry Pi 4 (4 GB) with this Tutorial. That worked but when Windows started and wanted to run the setup, it no longer recognized my keyboard and mouse. So I can't ...
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25 views

Proper GL Driver configuration on RPi 4

Can someone confirm what I should do on a raspberry pi 4 to access the new DRM based opengl drivers? I expected to see a new option in raspi-config for it, but instead I only see the legacy and fake ...
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25 views

How can I setup an automatic network manager popup in Kiosk mode?

I've set up raspberry pi 4 to auto-start chromium on kiosk mode. So far I've been setting up the wi-fi credentials via raspi-config. I would like instead, that once chromium tries to request a website ...
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15 views

Trying to start dropbox daemon on Raspberry Pi 4

I was following the post by @goldilocks titled "Use dropbox client on Raspberry Pi B+ Linux raspberrypi 5.4.51+" and I got to the point of trying to start the daemon and it tells me the the ...
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33 views

Raspberry Pi Black Screen

I just got a new raspberry pi 4 model B. I used it twice and it was working perfectly fine. But on the third time, when I tried to turn it one, I have the rainbow screen then the screen which says &...
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1answer
44 views

rpi4 reliability boot ssd vs boot sdcard + ssd active drive [closed]

Nearly all the questions and posts around the internet discuss sd card vs SSD which should be fairly obvious, my question is unique? If someone knows a discussion of this elsewhere please link me. I'm ...
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37 views

Raspberry PI 4 won't boot into desktop

Hey guys I'm stuck in a tricky situation :D Today I tried to rotate my touchscreen via adding a line in the libinput.config file. Something must have gone wrong because now when I boot just the ...
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1answer
53 views

Pi 4: SD Card or USB SSD?

I'm currently using my Pi4 as a NAS with OpenMediaVault and i was thinking about moving the OS from the SD Card to an external SSD on one of the USB 2 Ports, since both USB 3 Ports are being used for ...
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0answers
16 views

Connecting Mini GSM/GPRS Breakout 800L to Raspberry Pi model 4B

I am trying to connect my Raspberry Pi to a sim card that I bought so that is can send an SMS and access the internet, but I am struggling to connect the sim module to my Pi. I have attached a GPIO ...
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2answers
52 views

How do i start? [closed]

I'm a homebrewer looking into getting into the automation side of brewing. I'm setting out to get a part list together to expand my build and I've heard this sort if process can be done with the ...
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2answers
30 views

RP4 omxplayer installation problem

I'm trying to install omxplayer on raspberry pi 4 (Debian Buster x64) but I'm having so much trouble and can't install it. First of all I tried: apt update apt install omxplayer And had the following ...
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26 views

Possible ways of 16khz sound input in raspberry pi 4

I am using the Teensy 3.2 development board for converting audio signals from analog to digital. Also, you can be called a custom USB sound card. Here I attached the Audio programming diagram. I am ...
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12 views

How can I display through resistive touch screen and hdmi monitor at the same time?

I have an application written in Python that working witht resistive touch screen. The problem is that I need to display it to a big screen for presentation purpose. The problem is I can only choose ...
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1answer
33 views

How PowerOff Bluetooth on Pi4?

There's some information around disabling Bluetooth interface on boot for Raspberry Pi3 and previous, as described on this page: Disable power on Wifi and Bluetooth interfaces during boot? The same ...
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2answers
45 views

I2C not detecting PCF8574 [closed]

What is the issue here? LCD has backpack. Connected following schematic to Pi: I2C is not detecting adress of PCF8574: Things I have already tried: Reinstalling I2Ctools, ensuring I2C is turned on ...
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14 views

Installing custom ROS package using Catkin on a Raspberry PI 4

Before reading please know this is my first week using Linux/Ubuntu. I have recently installed ROS melodic within my Raspberry PI 4, with the purpose of using this camera from ESPROS. The manuals from ...
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11 views

How can I use cec control on Kodi on raspbian without lg remote

I recently installed Kodi on raspbian. But I've lost my lg remote. However I have remote that can turn on/off my lg TV and navigate setting using arrow key and it also can send ok signal. ...
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46 views

32 and 64 bit usage

My raspberry Pi 4 reports with uname -m armv7l I understand that it was a business decision here: https://www.raspberrypi.org/forums/viewtopic.php?t=245846 to do so and not go for arm64 However when ...
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2answers
63 views

Raspberry Pi 4 2GB not booting 32 bit raspian images

I've just bought pi 4 2GB and previously used Pi 3 B+ (still using on a dedicated project). Raspberry pi OS 32 bit systems not booting at all. I tried the same sdcard on pi3 and boots without any ...
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1answer
59 views

RPI 4B - Bluetooth unavailable on Ubuntu 20.04

I want to use Bluetooth on a Raspberry Pi 4B which has Bluetooth included. I used an Ubuntu 20.04 64-bit server image (using the Imager) mostly because I already know this OS. After a fresh install, ...
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89 views

Raspberry pi 4 - Hardware offload of h264 video decoding in Chromium

I am trying to develop a web application displayed in chromium in kiosk mod (78.0.3904.108 (Official Build) Built on Raspbian , running on Raspbian 10 (32-bit)). I am hoping to play h264 medias ...
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2answers
80 views

How to unlock password for Pi account

I wanted to control my Pi with my PC via ssh. In the tutorial they recommended making a new account and locking the Pi account(for security purposes). I followed these instructions: 1.)Make New Super ...
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1answer
27 views

Unable to use aircrack-ng commands after using the argument --bssid with airodump-ng!

I'm using the internal network adapter which comes with the Raspberry Pi 4 and Kali OS's Pi 4. First I type the command airmon-ng check kill The output airmon-ng start wlan0 Then airodump-ng wlan0mon ...
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23 views

How do I set up soundwire as the ALSA in raspicast?

I am using raspicast to stream videos to my rpi and sound wire to stream audio to my phone. How do I make it so the ALSA output on raspicast is set to soundwire. I have no idea what to do.
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3answers
143 views

How much temperature is normal temperature for Raspberry Pi 4

I am running a haarcascade based face detection and face recognition on Raspberry Pi 4. The CPU temperature rises to 83-84C. So I have installed a heat sink and 5v pi fan. After installing this, I ...
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3answers
66 views

Running Toy Motor circuit with Pi's 5v

I am currently going through the tutorials included with those kits that you can get for the Pis with breadboards and components, etc. Anyway, in the tutorial, I am making the following circuit: In ...
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1answer
31 views

Starting program on startup only when monitor is not connected

I want to make one of my projects begin upon startup and found a few tutorials for that, but I want to make it so it only auto-activates when no monitor is detected. I have a pi4, and have heard it ...
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1answer
52 views

Raspberry Pi 4b HDMI inconsistancy [duplicate]

Just doing some testing for a project. The project involves two SBCs right now(one is the Raspberry Pi 4b). I have one TV handy so I had the other SBC connected initially. For reasons pertaining to ...
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0answers
36 views

RPI-Clone an SSD to an SSD - Fails with I/O Error

I have a RPi 4 system with 4GB RAM and another 4GB with ZRAM. It is running XFCE and I've successfully converted from SD to SSD. Everything works fine here as of right now. Recently I've attempted to ...
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1answer
30 views

raspberry pi access point status

I have created an access point on my raspberry pi, now I wish write a python program to check if an access point has been created or not? is it possible to know through command line or python library....
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1answer
73 views

How to replace SD card slot on Raspberry Pi 4?

When removing my Raspberry Pi 4 from its case, the SD card snagged and the metal SD card slot broke off at the top. I could push the metal back to connect with the board but the card would not read ...
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1answer
46 views

Running .py code after power supply loss [closed]

I have an interesting problem, I want to mount a camera on the front of a tractor(Sony RX0M2, similar to a gopro). The camera will eventually be used for image processing. A PQ-12 micro linear servo (...

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