Questions tagged [pi-4]

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

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FullPageOS - Enable Autoplay for Media

I want to use my Raspberry pi as a music player, for that I coded up a simple webpage, but now the problem is that I would need to click the play button once every time I restart it and I do not want ...
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19 views

Raspberry pi does not detect compass sensor

I have a GY-91 sensor connected to raspberry pi 4B+ and only mpu6050(accelerometer, gyroscope) address 0x68 is getting detected while the compass sensor address 0x0C is not. $ i2cdetect -y 1 0 1 ...
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1 vote
1 answer
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Raspberry Pi 4 having issues reading from a RFID-RC522

I am following this tutorial to get my raspberry pi set up with an RFID module. Unfortunately, I cannot get it to work. Specifications Raspberry pi 4 Model B Raspbian GNU/Linux 11 (bullseye) Mifare ...
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  • 11
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1 answer
30 views

System binaries fail with "Exec format error", apt-get fails with "117: Structure needs cleaning"

Most system commands fail with "Exec format error" and apt-get upgrade fails with "117: Structure needs cleaning". Does this sound like an SD-card corruption? If not, what could ...
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1 answer
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How best to run a raspberry Pi 4 from a 12V DC supply

The Raspberry Pi 4B uses the USB-C input as its power supply. To the best of my knowledge a full power USB-C supply is 20V or is it any voltage up to 20V? If it's variable, is there a good way of ...
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  • 105
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1 answer
29 views

Connecting 2 SATA HDD to raspberry pi 4

I'd like to use a Raspberry Pi 4 as an NVR (CCTV camera recorder). I currently already own two 1.5TB low power SATA Hard Drives which I'd like to use in RAID 1 for redundancy. The Raspberry Pi 4 does ...
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  • 105
2 votes
2 answers
64 views

Rasberry Pi signal repeater/extender

I'm trying to extend the range of a robot that uses UHF or Wi-Fi signal to communicate with its controller with a range of 100 meters. Is it possible to implement RPi 4 to serve as a signal booster/...
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Raspberry 4 Java Pi4J GPIO Input not changing state

I am trying to use my Raspberry Pi 4's GPIOs to turn on various thing in my smart home. I am getting 2.6V on the GPIO Input, thus resulting in a HIGH signal. I have confirmed this with a basic python ...
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2 votes
1 answer
57 views

How to disable Raspberry Pi network booting

I have a Raspberry Pi 4B that only boots if an ethernet cable is plugged in. Basically on boot it waits for network boot until an ethernet cable is plugged in, then boots normally. How can I disable ...
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26 views

Raspberry Pi 4 B NetworkManager Hotspot - limited to five connections?

I'm trying to connect multiple computers to a Raspberry Pi 4 B hotspot, using NetworkManager to handle the network, and I can't seem to connect more than five devices to the hotspot. Every source I've ...
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1 answer
32 views

RGB Matrix interfering with GPIO button

I have a Raspberry Pi 4 running Raspbian Lite. On that I soldered an Adafruit Hat + RTC and connected Adafruit 64x32 RGB Matrix. I have also connected a GPIO push button to pin 5 & GND#4 For the ...
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17 views

Is it possible to use DSI and HDMI out display together in RPI 4B?

I am new to RPi and sensor thing. I come from Python Flask backend developing background. Right now, I mainly use I2C sensors' available adafruit python library or SMBus if no Python library exists ...
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40 views

Trying to Connect RaspberyPi4 to my monitor

LG monitor LCD 22" max res: 1680x1050 60Hz(without overclock) Using microHDMI to VGA hostOS: w10 64bit guestOS: raspberypiOS 32bit whenever adapter is connected to my monitor underscore(_) symbol ...
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0 answers
14 views

Wifi Direct: Intermittent Issue with Wifi Device

I'm working on making a "Wifi Direct" RPi device (Raspberry Pi 4). Generally, if I run wpa_cli p2p_group_add, it creates the device p2p-wlan0-0 which shows up in ifconfig. However, about 1 ...
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  • 101
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1 answer
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How do I setup Raspberry Pi 4 to use with a Windows laptop?

I'm a new user with my first Raspberry Pi 4 (model B), but don't have a separate monitor, keyboard and mouse. I would like to use my laptop (running Windows) to use the Pi. So far I have: Downloaded ...
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24 views

RB4 2GB won't boot, ACT keeps blinking

today my RPi 4 2GB stopped booting, used multiple SD cards that work with my RPi 3, Power light is on and not blinking but ACT is a bit dim and flashed continuously, with or without a SD card in. ...
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38 views

WiFi Direct connection peers limit on Pi4 4Gb

After setting up wifi direct starting from official image "Raspbian GNU/Linux 10 (buster)", i've developed a python script to automatic accept incoming request connection via wps_pin. At ...
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1 answer
39 views

Does there exist a list of all required processes, for a raspberry pi running raspbian, to continue proper operation? [closed]

I am using the htop command to get a list of all processes running on my raspberry pi 4 and I was curious if there exists a list of all processes that are required for the pi to continue running. I ...
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0 votes
1 answer
58 views

Timer in Raspberry Pi with micro seconds

I have a Raspberry Pi 4 and I use Python. Every 100us, I need to read ADC value and send it to a laptop via an Ethernet cable. I am looking for a solution about the timer with high accuracy, so that ...
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21 views

spi driver works on pi 3 and pi 4, but not on pi cm4

I have a spi driver for an nrc7292. When I load it on a pi3 or 4 it works every time, but when I load it on a cm4 it only loads correctly about half the time. What could possibly be different? Once ...
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0 votes
1 answer
41 views

Cannot set up I2C running on Ubuntu (transfer timed out)

I have a Raspberry Pi 4 with 8 GB RAM running Ubuntu 22.04 LTS. It is packed in an Argon One case. I'm trying to use a Waveshare BME280 Temperature/Pressure sensor that I already used before on a ...
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0 votes
1 answer
64 views

How to get Python binding to recompiled libcamera?

I am trying to recompile libcamera, as I will be changing some stuff in it and I would therefore like to install it manually. The compilation and installation are successful, but I am not able to ...
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0 votes
0 answers
21 views

Looking to use Raspberry Pi 4 as a USB audio sink, for direct connection

I want to use my Raspberry Pi to take real-time audio (not network streaming) in PCM via USB, where a PC host will see the Raspberry Pi as an audio device gadget. From there, I plan to use the CPU of ...
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0 answers
34 views

Waveshare 3.5 LCD screen not working

I have two 3.5 inch waveshare RPi screens (https://www.amazon.com/Resistive-Screen-IPS-Resolution-Controller/dp/B07V9WW96D/ref=sr_1_1?crid=174003FCA1ORU&keywords=waveshare+3.5+RPi&qid=...
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0 answers
41 views

Voltage drop at 5V pin when drawing current with DC motor

I encounter a power behavior for my Raspberry Pi 4B that I struggle to explain. I try to power a (geared) DC motor using the 5V pin. DC motor is rated for 3-12V (preferred 6-8V) and is claimed to draw ...
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0 votes
2 answers
50 views

Raspberry Pi 4 configuration for use with battery

I need to use Raspberry with a battery pack the problem is that in normal configuration Raspberry expect a very stable and costant power supply and even a small change will cause a lot of warnings in ...
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  • 113
1 vote
1 answer
96 views

Touch screen stuck at black screen with blinking cursor unless HDMI plugged in

My touchscreen that I've attached directly to the Pi shows a black screen with a blinking cursor on boot up. However, if I attach a mini-HDMI to DVI cable to the Pi while it is off and then boot it on,...
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0 votes
0 answers
51 views

Cannot connect with SSH over hotspot; Getting: "kex_exchange_identification: read: Connection timed out"

I have a raspberry pi 4 and using it for a while. I always connect it via SSH over local network with my computer. But recently, I'm seeing and error such as: kex_exchange_identification: read: ...
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1 vote
0 answers
34 views

Can't get wifi adapter MT7601U to work on ubuntu server 22.04 for raspberry pi 4

I bought this generic wifi adapter which has MT7601U wifi chip inside it, it doesn’t work on my Ubuntu server 22.04 OS But the adapter works fine out of the box on my twisterOS installation Am i ...
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1 answer
32 views

RPI 4 and creation of scripts from buildroot

I want to know if it is possible to allow my system created by buildroot, to automate the execution of script which would allow for example, to switch from qwerty to azerty (maybe this option exists ...
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  • 103
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0 answers
47 views

Raspberry Pi 4 not booting after the welcome screen splash

I shut down my Raspberry Debian OS (properly using Shut Down) to attach a DHT22 Temperature and Humidity Sensor to the board. After connecting the sensor, I started the Pi. I get a colorful splash ...
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0 votes
2 answers
60 views

Cannot Boot a PI4 8GB with more modern OS than 32-bit Raspbian 2020-02-13

My machine will boot with this older Raspbian image, but I cannot update/upgrade the installation. I run: sudo apt update I get: WARNING: apt does not have a stable CLI interface. Use with caution ...
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0 answers
24 views

Errors Changing /boot/config.txt externally

I was overclocking my pi, and I went a little overkill, so now it wont boot. Im trying to change config.txt back to its previous state externally, but I don't have the permissions to do it. I tried ...
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0 votes
1 answer
23 views

I am using Raspberry pi 4b, when I try to connect with wifi a problem could not communicate with wpa_supplicant

I am using lite os (for using open media vault 5). Yesterday I use my wifi with my pi and it works fine. But after install OMV5 I tried to connect with my wifi but a problem occurred. It says Could ...
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0 votes
0 answers
84 views

Different UART behavior between ttyS0 and ttyAMA0

I'm using serial to communicate with this board (Serial-CAN-Board) on a RPi4. UART is enabled with enable_uart=1 Console over serial has been disabled with raspi-config and I am using SSH over ...
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0 votes
0 answers
32 views

run servo motor with external power bosen't work for me

I use 9v/0.5A DC cable to breadboard and connect servo motor but it doesn't work. Code might be wrong but I'm not sure. I connect raspberry pi - breadboard - servo motor like this and this is the ...
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0 votes
1 answer
26 views

Help, I mamed the RPI's networking drivers, and now I can't get it back to normal!

everyone, I messed up my RPI4B's wifi and networking software. BAD. Long story short , I followed a bunch of guides on how to host and connect to a wifi network at the same time (ethernet - acces ...
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-1 votes
1 answer
20 views

Triggering MAPIR camera with PWM via GPIO on RPi

I have similar setup as this post: PWM via GPIO to trigger a MAPIR Camera but a different camera: https://www.mapir.camera/collections/survey3/products/survey3w-camera-red-green-nir-rgn-ndvi. I am ...
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  • 109
0 votes
2 answers
25 views

Powering 3 sensors from one 5v pin

I am powering 3 different sensor (a temperature sensor, an IR transmitter and an IR receiver) on my Pi. I would like to use the same 5V pin to power all three. I connected a jumper onto the 5v pin, ...
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  • 113
0 votes
0 answers
45 views

Ubuntu server could not get clk: -517 on boot

I have a Raspberry Pi 4 8gb running ubuntu server 20.04, having the root partition through usb to a 1Tb ssd. And recently when booting the system, it displays this error: [ 1.313819] spi-bcm2835 ...
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0 votes
1 answer
28 views

Seeed Respeaker speaker output is very low

I am using ReSpeaker 4 microphone array kit with raspberry pi to get the ASR system. Respeaker mic array has its own speaker output (not the jack output) on board but the output volume is very low. ...
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  • 1
0 votes
0 answers
22 views

multile websites using lighttpd? I.E. just 2 for now

i am using bullseye on a pi 4. would like to understand the configutaion files on how do i set up 2 websites to be accessed from the Internet?
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22 views

Raspberry Pi4- Dual HDMI -fbi

I am trying to display tkinter GUI on raspberry pi touch screen which is on hdmi0 and project the images using projector on hdmi1. But when I click the button to project image ie when I execute the ...
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0 votes
1 answer
49 views

How to decode struct data sent from an Arduino via NRF24L01?

So basically I'm sending this struct data from my Arduino to my RPi, both fitted with an NRF24L01 module. Library on the Arduino is tmrh20, and on the RPi, BLavery. struct values{ char ...
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113 views

Setup external Bluetooth usb dongle

I want to use an external Bluetooth 5.1 USB adapter on Pi4. The chip on the adapter is Realtek RTL8671b. I googled how to get an external BT work and most of the tutorials suggest disabling the ...
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0 votes
0 answers
22 views

Controlling Hardware with Object Detection on a Raspberry Pi

I'm working on a project that would utilize a raspberry pi and object detection to control hardware, and I'm not sure what the best way to go about it is. The basic premise is, a raspberry pi with a ...
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0 votes
0 answers
28 views

Pull up and external interrupt output on GPIO of a raspberry pi 4

Currently I am working on programming some pins of the GPIO interface on a Raspberry pi 4 without using any high-level library (like wiringPi etc...). I just found this link that was helpful (https://...
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0 votes
1 answer
35 views

I am trying to make a camera turn on and off with the press of a button, but the GPIO ports are not working, and it is not acknowledging the button

I am using python, and I am getting an error where it says "GPIO.output(24, False)" in the else statement. I don't know what it means, or how I fix it. from picamera import PiCamera from ...
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55 views

Help with EEPROM log: RPI4 does not boot

This is another "RPI does not boot". I have tried many thins now and I'm not able to figure out why my RPI4 (that is quite valuable these days) does not boot. EEPROM is working fine and I ...
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  • 213
0 votes
0 answers
34 views

Python 2.7 and 3.x coexisting in harmony?

I'm on an RPi4 running the 64-bit version of Raspbian and want to have 2.7 and 3.x coexisting with NO problems. 3.x is part of the 64-bit Raspbian when installed. I just installed 2.7 (i.e., sudo apt ...
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