Questions tagged [pi-4]

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

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2
votes
1answer
20 views

Power Pi4 with USB-C Power Bank

Can a USB-C Power Bank be used to power a Pi 4 for off-grid or mobile uses where the Pi cannot be tethered to either a mains electric socket or a POE switch?
1
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1answer
26 views

Setting WiFi up via the command line Ubuntu server 18.04.4 LTS - Raspberry Pi 4 Wireless connectivity

I have the Raspberry Pi 4 Model B and my choice of RAM was the 4GB. i don't have internet via the gigabit ethernet at the moment, all i have is my smartphone to share internet via a hotspot (wifi). i ...
1
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1answer
39 views

Unable to work around Raspberry PI 4/4GB USB issue

I've recently acquired a Raspberry Pi 4/4GB, which I'm planning to use in place of a failed motherboard/GPU in an old 24" iMac, re-using only the display, PSU, fans and speakers. Initially, I'm at ...
0
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0answers
27 views

"How can Rpi4B connect, calibrate, and read the pH-4502C sensor?

When wiring it is the same in other ph sensors like dFrobot ? Any tutorial? website? Need help badly.
1
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2answers
25 views

How to disable Acess Point mode (Router/Repeater)?

I set up raspberry pi 4 with this tutorial : Access point as WiFi router/repeater, optional with bridge. How do I turn off ap mode and how to enable it again? When I plugged in ethernet port, the pi ...
1
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1answer
29 views

Does Raspberry Pi 4 Support Android Things?

I am trying to communicate with an MFRC522 device using my RPi 4B and the SPI interface. My application is written in Java and communicates under NetBeans with the RPi as a remote platform. The ...
1
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1answer
36 views

RPi 4 doesn't bring up wlan1

I have a Raspberry Pi 4 with Raspbian 10 (buster) installed. This device will be placed in a waterproof metal box which will limit the on-board wifi range. So, I want to use a USB wifi adapter with an ...
0
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0answers
22 views

How to solve the DDNS exposure router management web dashboard issue?

Using the duck DNS. I did the port forwarding, everything works well. 8888 => 192.168.10.2:80 One thing I found is that each time I visit the ddns url, it goes to my router management to ask ...
2
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0answers
30 views

USB ports heavily lag or disconnect completely

We have a Raspberry Pi 4B running Raspbian as a lightweight management console. (A cost effective way of managing network devices over RS232 and such.) I've noticed some problems with the USB ...
0
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1answer
34 views

Raspberry Pi 4 network boot without tftp?

we want to boot the PI 4 from the network without an sd card. We already have an old system that works on the old pis with a minimal image that gets from the DHCP server the boot server. Is something ...
0
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0answers
12 views

Erro downloading kinetic ROS on RPi 4

I am following the guide provided on github to downloading raspbian and ros. I followed the steps mentioned here: http://wiki.ros.org/ROSberryPi/Installing%20ROS%20Kinetic%20on%20the%20Raspberry%20Pi ...
1
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0answers
37 views

what's the best method to detect lane lines using raspberry pi?

i have a question about a project that im working on. im making a lane keeping assistant on a self driving car (im using a toy battery car that a kid can ride on) which requires me to detect the lane ...
1
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1answer
36 views

Change Splash on Pi 4

Halfterm is upon us, I've got a RP4 for my daughter and want to change the splash screen for her, but I've never used Linux based systems before and so don't know where to start. I've already got the ...
-1
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0answers
43 views

Trying to install Zabbix, “frontend does not match Zabbix database”

0 I've been following this guide to setup Zabbix on my raspberry pi 4. I'm trying to setup the front end and go through the steps but I get the error "cannot connect to the database. The frontend ...
1
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2answers
49 views

Stream raspberry pi camera on web page

I realized that i can plug my web camera to raspberry pi. now i'm looking for a way to stream it on a web page. also i want to get streams over internet. are them possible? how can i install it? ...
0
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0answers
29 views

I'm having trouble reading AC signals on my ADS1256 24 Bit 8 Channel ADC

I'm trying to read AC signals using single-ended mode but for reason, the reading is off by a factor of 10. For example, if the actual signal is supposed to be from 0 to 5 V I get a reading from 0 to ...
-1
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0answers
30 views

Rotate display on rpi4 with ubuntu server 19.10

i need to rotate the display on a rpi4 using ubuntu 19.10. I tried by adding some stuff in usercfg.txt, which seems to be the new config file on this version but i don't manage to make this work. ...
2
votes
2answers
54 views

I would like to virtualize an existing Raspberry Pi 4. Goals are to preserve its setup, avoid losing it due to SD card corruption, and increase speed

I built a RPi 4 with UniFi, WireGuard and Pi Hole. Thankfully I made a copy of the SD card, and took an image of it, because the first card stopped working (it got super slow and then just stopped ...
2
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0answers
19 views

Using GPIO on the Bitwizard DMX hat board

I have a rpi 4, with a relays board on top of it, and a Bitwizard DMX hat board on top of that. The Bitwzard board doesn't have a male header on the top, so I am unable to connect my sensors. It was ...
1
vote
1answer
43 views

Budgie DE on Pi 4

I've tried to install the budgie desktop on my raspberry pi 4 for almost a week now. people on discord told me to run a set of commands that allegedly worked for them. However, I have a fresh raspbian ...
1
vote
1answer
30 views

Which peripherals remain powered when the raspberry pi 4 model B enters poweroff state?

When I ran the command poweroff in ubuntu 19.10, I noticed that both the Ethernet port and USB ports remain powered even when the rbp4 seemed to have halted. Others using rasbian seem to have had ...
2
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0answers
16 views

help getting ble-mesh (bluetooth mesh) working

I was hoping to get some help. I have been working on getting bluetooth mesh working on my raspberry pi 4 for a few days and feel I am hitting a brick wall. I am referring to this pdf that was ...
2
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0answers
25 views

Using Motion to Post Photos Captured to API

I am attempting to build a program that will automatically post the photos taken by motion from my usb webcam to a rest API, and have ran into some problems. My livestream works correctly, and it ...
4
votes
2answers
50 views

Is it possible to record the screen and Audio on a Raspberry Pi 4 model B

I wanna record my screen and audio, Is It Possible? how to do that? I use Raspberry Pi 4 Model B. I still new, I hope you can help. thanks.
4
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1answer
76 views

PI 4 sometimes doesn't boot after rebooting from command line

I have a new Raspberry Pi 4 connected to a motherboard that supplies very stable voltage and current to the Pi. I flashed an SD card with the latest distro and realized that sometimes when I run ...
0
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0answers
16 views

Unable to update RPi 4 after installing Plex

I'm unsure as to what happened, but I am unable to run sudo apt update on my rpi 4. I believe this problem came into play after I installed plex via this tutorial. I have looked in /etc/resolv.conf ...
2
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1answer
92 views

AP Bridge VPN IPTABLES rules needed

I have set up an access point with a bridge (bridge: I want to be able to access all other devices within my network) using this How-To (Setting up a Raspberry Pi as an access point - the easy way). ...
1
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1answer
54 views

Internet through wifi lost after some time (on Pi4B on Raspbian)

I have a problem with my Raspberry Pi 4B running Raspbian When I boot it, internet through wifi works, but after some hours (between 6 and 24 hours, approximately), wifi is still working but nothing ...
1
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0answers
22 views

Enabling loop and interrupt

I am a complete novice and would like some help with simple code. I am using a Pi4 and learning Python to code. I need to create a loop that counts pulse inputs to a certain number then triggers an ...
0
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0answers
18 views

Pi4 WiFi connection interuptions (Ubuntu 19.10 image)

I use RPI4 and Ubuntu 19.10 64bit image. The WiFi (I use the built-in) stops from time to time with those errors: Feb 08 15:21:58 ubuntu kernel: kworker/u8:2: page allocation failure: order:0, mode:...
0
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0answers
12 views

Raspberry Pi 4 Camera video not working but image are

https://projects.raspberrypi.org/en/projects/getting-started-with-picamera/4 The error is persistent using the CLI raspivid -o Desktop/video.h264 and with python camera.start_preview() camera....
4
votes
1answer
400 views

Large Download Pi Server

I have a raspberry pi 4 (2gb) set up as a file server. I was wondering if it was possible to create a tool, where when I paste a link into some sort of prompt, my raspberry Pi would download the file ...
0
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0answers
18 views

RPI-KYB keyboard model not in keyboard configuration list

I have a raspberry pi keyboard from the desktop starter kit (Model: RPI-KYB). I am running raspbian lite and cannot configure the keyboard correctly. The RPI-KYB model is not in the raspi-config list ...
1
vote
1answer
28 views

Copy OS Image onto SD Card Partition

I have a 128GB SD card that I've partitioned into 4x30GB primary partitions and a 200MB EFI boot partition. I would like to be able to have four OS on this card, but can't find software that allows ...
0
votes
1answer
43 views

Operating 2 Gpio pins at same time

I want to write a program that can operate 2 gpio pins with different ON-OFF times at same time. Say the time duration is 2 sec. In this time duration, I want to set GPIO 4 HIGH for 1 sec and LOW for ...
3
votes
2answers
67 views

Hosting LAMP on SD-card in RPi now - would like to move whole database and website to External USB 3.0 SSD

.I am hosting this website on the RPi 4 - 4GB Ram model. I'm guessing the google PageSpeed insights ranking score is kinda ok right now (it ranges in the middel with a score of 56) - try and test it ...
3
votes
1answer
77 views

How to hibernate raspberry pi4? suspend-to-disk, aka power off state

I apologize for the lack of knowledge. I am attempting to Hibernate / leave all open applications open, unplug power take the PI somewhere else and reboot starting up right where I left off. This ...
1
vote
1answer
26 views

How to remove choppiness from streaming?

I tried GStreamer but it was not getting installed as its dependency repo link which we place in source.list was outdated. I tried mjpg-stream but it kept saying that I don't have a camera connected ...
1
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1answer
23 views

Can I use 12v and 8amp battery with L298 motor driver

Can I use 12v and 8amp battery with L298 motor driver with raspberry pi model?
1
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1answer
42 views

Rpi 4b bluetooth does not show up

My bluetooth will not show up at the top right corner of the taskbar like it is supposed to. I have tried: -Adding multiple of them in the add/remove panel items, but none show up. -rm -r ~/.config/...
4
votes
2answers
62 views

Watchdog on the RPi4

Does the Raspberry Pi 4 have a hardware watchdog timer like the RPi3 does? If it does, which kernel module should I load in order to use it? I'm running Raspbian Buster, kernel 4.19.93-v7l+ Thanks.
3
votes
1answer
71 views

Power Supply Raspberry pi 4

I have googled a lot but didn't find anything useful. Can I use any power adapter other than the official Raspberry Pi supply? Moreover, I have an Argon One Case and many people have recommended ...
3
votes
2answers
54 views

RPi 4 connected to wifi but no internet?

My problem is similar to this question but the answer provided there is not helping me. I am working on RPI4B and connected to WiFi with my Android device. If I modify the etc/network/interfaces ...
1
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0answers
32 views

Slow transfer over wget and curl on RPi4

I have issue with curl and wget transfer speed on my new Raspberry Pi 4 1GB. Pi is sonnected to the router by ethernet cable. When I try to download for example a large test file or something from ...
0
votes
0answers
36 views

Raspberry Pi 4 Model B running Ubuntu Server 19.10 HDMI Video Output Distorted

Hello Raspberry Pi Community, I installed Ubuntu Server on my Pi 4b today, and I installed the budgie desktop as well. I had an issue with the the HDMI output being distorted, but due to some lines I ...
1
vote
1answer
39 views

Powered USB Hub Requirements

I dont plan on powering my Pi through a USB hub, but I do intend on hooking up some HDD's to a powered hub since everything I see so far seems to indicate that the pi cant power multiple HDD's. If ...
1
vote
1answer
61 views

Raspberry Pi 4 take 4-5 seconds to load GPU firmware and start to loading the kernel, is it normal?

I'm in the stage of optimizing Raspberry pi 4 startup time, supplied with a custom system image created by buildroot. I'm just trying to build a default image like this: git clone git://git.busybox....
0
votes
2answers
71 views

Will SD-card in an RPi 4 always be faster than USB 3.0 writing/reading to an installed web-server?

Setup: RPi 4 with LAMP on IT sucks DK My SD card is quite quick sure (it's a Class 10 too and all) but my question is this: Would there be increased performance if I hosted my web-server files on a ...
1
vote
1answer
93 views

Weird display on VGA monitor, Ubuntu Server 19.10 on Raspberry Pi 4

UPDATE: As I suspected lately, Ubuntu Server actually boots up. Nothing worked until I tried using an actual HDMI monitor instead of an HDTV or VGA monitor. I suppose the TV will work once I install a ...
1
vote
3answers
98 views

Is it possible to run my Raspberry Pi in a low level mode?

I bought a Raspberry Pi 4 Model B/4G B. I want to use it 24/7 day and night to run a program over the internet. This program doesn't ask for much resources to run. When I plugged it in the socket, the ...

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