Questions tagged [pi-4]

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

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Raspberry Pi wont connect to Mac via ethernet cable an eth0 IP keeps changing

I have set up my pi as a WAP and I usually ssh into it via a ethernet cable connected to my Macbook. everything worked yesterday but when I booted it up today it won't ssh into my pi. I set up my ...
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12 views

ADC Address in Raspberry PI [duplicate]

How to allocate address for another ADS1115 which is an ADC in Raspberry Pi in I2C interface? The first ADC will be allocated an address of 60. But how to manually allocate the address for second ...
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1answer
13 views

How to shut down the RPI4 for a certain time or prevent it to turn on power on booting

For my project, I access the RPI remotely. The RPI continuously powers sensors over its 3.3vdc rail. For testing & troubleshooting, I would like to cut current to those sensors for some time. ...
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1answer
33 views

Scaling down the SPI0 clock value on RPi 3B+/4B

I have a custom STM32 MCU board that interfaces with an RPi 3B+ via the SPI protocol. The MCU (STM32F407) has its SPI peripheral clock set at 84MHz and is configured as a slave device. For reliable ...
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1answer
119 views

Securing VNC connection

I have an old laptop (linux mint xfce) I use for a VNC viewer connected to the Pi 4. This gives a significant performance improvement and access to the latest 64bit s/w. Is there a way to make this ...
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10 views

Send USSD command to mobile phone connected via bluez to raspberrypi 4

I just start working with ofono and when I want to send USSD command. when I use initiate-ussd <modem> I get this error: Traceback (most recent call last): File "/home/pi/workspace/libs/...
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0answers
21 views

HDMI port back-feeds my Raspberry 4 and keeps it from totally powering down

I don't want to power anything from the HDMI port. My power supply has a neat switch built into the 5v cord, and after shutting down the Pi, I just want to cycle the switch to bring the Pi back alive. ...
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1answer
10 views

force_eeprom_read=0, but RPi4 still stuck at rainbow screen

I have made a custom PCB/Hat for a Raspberry Pi and I need to use ID_SD and ID_SC as general GPIOs. At the moment Raspberry Pi 4 gets stuck at Rainbow screen when booting (with Raspberry Pi 3B+ ...
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22 views

RPI4 bootloader works, but won't load OS

I have a RPI4 that I was running as a desktop for my kids. It was booting from a USB3 HDD, but stopped at some point. I loaded raspberrian onto an SD card to see if there was a problem with the ...
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4answers
2k views

Performance of Raspberry Pi 4 in luks?

I found previous version was quite slow (3MB/s), but this newer Pi has more power. What speeds can I expect with external hdd and standard installation of luks (I believe aes 256, xts, plain 64)?
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2answers
272 views

HDMI "No Signal" when plugged to my monitor

I have very interesting problem when i plug my HDMI to my monitor. It shows "No Signal" and I don't know from what is coming. Hope somebody know an resolve for this issue and answer me. First when I ...
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1answer
20 views

Pi 4, Hifiberry, and touchscreen power

I recently finished my basement and am in the process of getting it all configured, and one thing I wanted was to build a Raspberry Pi streaming device. I got a 3D printer for Christmas and found this ...
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1answer
47 views

I too have knocked off a component from the underside of my Pi 4 board. HELP

I too have knocked off a component from the underside of my Pi 4 board, a result of a poorly designed case. I could use help to identify the component. As I am dyslexic reading a schematic sends me ...
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0answers
18 views

Can a Raspberry Pi 4 be configured as an ad-hoc device or as a wifi access point?

Installed hostapd and dhcpd on raspberry pi os (bullseye) I configured hostapd and expected to see a wifi channel with the name I configured, I can't see anything. I read somewhere that the onboard ...
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84 views

SSD "failing" after use with RPi4 for a while

I've been playing with booting from SSDs in my RPi4s for systems that have heavy log-activity. I've been using this drive: Kingston 2,5" SATA SSD A400 480GB together with a 'generic' SATA to USB3....
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1answer
42 views

Air pressure transducer to be connected with RPI4

-I just want a recommendation for an analog air pressure transducer with a range from 0-10 bar (to be used in an electro-pneumatic system) to be connected easily with RPI4 (compatible with RPI4) and ...
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0answers
51 views

iw dev wlan0 station dump output signal missing

I used the following command iw dev wlan0 station dump to collect the information about the devices connected to the AP. I used to see signal level in the output in Raspberry Pi 3. When I tried to ...
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2answers
56 views
+50

Thermal mini printer receipt adafruit printing gibberish

I have written a very simple program in python to print the text value in the mini thermal receipt printer adafruit. Code: # On a CircuitPython microcontroller: import board import busio import serial ...
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2answers
32 views

Printing a image in the mini thermal receipt printer adafruit using raspberry pi

I have opened the command prompt on a Raspberry Pi and typed the command as: lp -d ZJ-58 -o fit-to-page /home/pi/Documents/image_name.bmp which produces the gibberish printing as follows: Could ...
1
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1answer
843 views

How to display an image full screen on my second monitor (raspberry pi 4)

I am using RPi 4 and running two monitors. I want to display an image on the second screen using Python or Linux command line. I have tried but I couldn't do this with fbi(it displays on the both).
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1answer
84 views

No HDMI video after boot sequence

Raspberry Pi 4B connected via micro-HDMI to HDMI cable to a 1920x1080 computer monitor. The boot sequence starts with text being printed to the screen (splash screen off) and when it should switch to ...
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2answers
272 views

Tally ERP on Raspberry Pi 4

I am trying to install Tally on a Raspberry Pi 4 4GB. I am currently using raspbian buster and twister OS. I installed tally in both the OSes using wine and box86. When I try to run it I get the ...
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0answers
58 views

RPi 4B does not boot properly with RPi OS

Raspberry Pi 4B does not boot properly with official Raspberry Pi OS. It was working 3-4 months ago. I have not used it since then. But today the issue occurs. If I attach power and monitor with RPi ...
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4answers
49 views

Replace a red Led activation on RPI 4

I have a PI 4 and accidentally broke the red led. I don know how to identify it in order to get a replace piece and soldering Any idea or help, please?
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1answer
26 views

Calculating power adapter needs for my Compute Module 4 setup

So I'm finding it a little difficult to figure out how I should be powering my setup. I'll have Waveshares IO board here: https://www.amazon.com/gp/product/B08VJBGD1Q/ref=...
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2answers
54 views

Phone charger for powering Pi 4?

I just bought the Raspberry Pi 4 Model B 2GB RAM and I forgot my charger at my house which I won't be able to get to in a few weeks. I was wondering if I could power the Raspberry Pi using a phone ...
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1answer
30 views

I have raspberrypi 4 board, after putting sd card only the pwr led is glowing not act led. And also the red led is not bright as usual

I tried booting with different SD cards but the problem is same , os was not booting and the pwr led was glowing with low intensity. Can you give me any solution to overcome this issue Please!
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1answer
25 views

Streaming video+audio from Pi4 to Pi4 via ethernet

I would like to stream video & audio from one Pi4 (equipped with mic/cam) to another Pi4 (equipped with screen/speaker) via ethernet (cable connected directly between them). I've looked around, ...
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2answers
156 views

How do I install an older version of ubuntu on raspberry pi 4?

I need to install an older version of Ubuntu (20.04) desktop version for compatibility reasons. The Raspberry Pi imager v1.6.2 on windows only shows Ubuntu desktop 21.10 as available. I tried to ...
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0answers
24 views

i2c not detecting on Raspberry Pi 4 Model B Rev 1.5

Just purchased a new board - Raspberry Pi 4 Model B Rev 1.5 - rev b03115. Trying to use i2c to interface with Adafruit PiOLED - 128x32 Monochrome OLED Add-on for Raspberry Pi Adafruit SCD-40 - True ...
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0answers
19 views

How to connect to a hotspot with dynamic ip on boot and get a static ip in rp4 with kali linux [closed]

I want to connect to hotspot on my phone automatically when i boot my raspberry pi 4 ( with kali linux installed ). I know that i can edit /etc/network/interfaces but the configuration file i have is ...
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0answers
17 views

Fresh Kismet Installation on RP4

Having to reconfigure my RP4 for kismet, with gps and Wifi. I tried compiling version2020 of kismet and that failed twice. My notes said v2016, which is what I then tried with another failure. So, ...
2
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1answer
352 views

Cannot install Wine from Pi-apps

I'm trying to install Wine on a 32-bit Raspbian using Pi-Apps. I have already successfully installed Box86 emulator from the same place. However, Wine installation ends in a segfault: Installing Wine (...
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1answer
98 views

Information about floating point unit of Raspberry Pi 4 Model B Rev 1.1

I have this RPI board. Hardware : BCM2835 Revision : c03111 Serial : 100000009f7a953c Model : Raspberry Pi 4 Model B Rev 1.1 I want information about Floating point unit(FPU) it has like ...
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2answers
3k views

Raspberry Pi 4 Ethernet not Connecting

I have a raspberry Pi 4 with raspbian, and I just booted it and connected it to ethernet. My Router does not detect the pi, so I cant ssh into it. I tried 2 different SD cards, and they both will boot ...
0
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1answer
250 views

How can I rotate my screen with OctoDash installed?

I want to rotate the touchscreen on my Pi4 with Octoprint and OctoDash installed on to. I've opend the file /boot/config.txt and added the line "display_rotate=2", but nothing happend (yes I ...
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1answer
439 views

RPI4 missing 'pieeprom.bin' file?

I'm trying to edit the bootloader config following the rpi official instructions (https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md). However, when I try rpi-...
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0answers
23 views

Errno 121 Remote I/O error happening too often on Raspberry Pi 4 [closed]

I'm using a Raspberry Pi 4 - Rev1.4 together with a tc9548 multiplexer and 2 additional I2C sensors behind each multiplexer channel. OS version: AME="Raspbian GNU/Linux" VERSION_ID="11&...
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1answer
21 views

Raspberry Pi: Unable to reboot (unable to mount root fs on unknown-block(179,2) - on brand new sdcard/image

I got some new Sandisk 32gb Ultra sdcards installed Pi OS on them etc - but when booting the Pi they gave the error in the title - all the same.
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1answer
64 views

RPI4 receives IP, doesn't respond to ping (over Ethernet)

I've been using a RPI0W as a server for a while now, but an upgrade was getting necessary. So... I bought another RPi4 (Because the PI1 and PI2 that I still had laying around weren't much of an ...
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0answers
38 views

Raspberry Pi 4 - I2C scan extremely slow and not working

I am using a Raspberry Pi4 - 4GB (exact model: Raspberry Pi 4 Model B Rev 1.4) with following configuration: AME="Raspbian GNU/Linux" VERSION_ID="11" VERSION="11 (bullseye)&...
0
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1answer
68 views

How to use only pi-hole dns in Windows 10 client, exclude router dns

I have installed pi-hole on two Raspberry Pi 4 devices. Both are connected to my network and working. I have an ATT router, so I cannot change the DNS servers in the router. I am attempting to set ...
0
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1answer
15 views

Pi4B display turns off after boot using 128GB microSD [closed]

I have my 4B connected to a 7in display via ribbon cable and GPIO pins for 5v. If I format a 32GB or 64GB microSD card the Pi boots and displays normally; however, using a 128GB microSD card the ...
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0answers
19 views

unable to use serial on CM4 using linux

When i am trying to connect to my CM4 via serial on my linux desktop and i am unable to get any output from screen i have ensured that enable_uart=1 is in my config.txt file for clarafaction i am ...
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0answers
10 views

Ir Touch Frame question

I have a Raspberry Pi4 running the newest Raspberry Pi OS. I rotated the screen from the OS menu to portrait. However my IR Touch frame is off. I touch the lower left it shows in the lower right, ...
1
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1answer
24 views

Boots correctly but says "No HDMI signal" after finishing kernel boot logs

I have a Raspberry Pi 4 Model B (8GB), I have flashed the latest version of Raspbian into a USB flash drive and I boot it from there. I've had no problems so far. Today I restarted it after about 2-3 ...
0
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1answer
36 views

VeraCrypt on RPi 4 Buster unable to find libraries

I installed VeraCrypt GUI on my RPi 4 running Raspian 10 Buster using the package veracrypt-1.25.4-Debian-10-armhf.deb on the VeraCrypt website. After checking the signature and successfully ...
0
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1answer
26 views

USB SSD I/O-Error after doing longer writes/reads on USB Port

I'm trying to read from a USB SSD that is connected to my Pi 4 (4GB) over a powered USB hub which should deliver enough power. There are a lot of files on it so for example when doing ls it takes a ...
0
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2answers
7k views

Raspberry Pi 4 native Wifi AC 5GHz not working

This is my first Raspberry Pi, I'm wondering why it can't connect to my wifi AC network when the specification clearly states it can. I have tried editing the wpa_supplicant.conf file to no avail. Any ...
0
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0answers
21 views

Which is the best dotnet core librery for controlling servo on Raspberry pi 4

Hello all I am doing research on the best library for controling servo motor on Rapberi pi 4 using C#. I tried some old ones. I will be grateful if you direct me to the best one for the purpose.

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