Questions tagged [hardware]

Questions relating to the physical components that the Raspberry Pi consists of.

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weird @^ in log files

i recently checked my log files and found lines just consisting of "@^@^@^@^@^@^@^@^" like specific lines have been removed from my log files, during the system bootup. here are 4 images. ...
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Problem Connecting Raspberry pi Pico with Thonny

Whenever i download the micropython uf2 file from Thonny and wait for it to reboot i get this message: Unable to connect to COM4: could not open port 'COM4': PermissionError(13, 'Access is denied.', ...
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Let the Raspberry Pi be recognised as USB mouse and forward signals from a bluetooth mouse?

I am not sure whether this is the correct stackexchange section. I would like to find a solution to use a Raspberry Pi Zero 2 W in a chain like this: Bluetooth mouse/trackpad -> Raspberry Pi Zero 2 ...
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Water pump stops after a few cycles

I have a small water pump (https://supermagneter.no/vannpumpe-6v-1-2l-min-tilkobling-4-mm-id625) that I control with a relay that is controlled by the raspberry pi. Usually I can start and stop the ...
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Raspbery Pi 3B+ - My USB ports don't work, but ethernet does

This is a pretty short question. My ethernet port works, but none of the usb ports seem to do anything when I plug anything in them. This is the case with a fresh raspi os image. How can I debug this?
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Enable hardware video decoding in VLC on Raspberry Pi OS Bullseye

As the title says: How can I enable hardware video decoding in VLC (or other player) in Raspberry Pi OS Bullseye? I'm on a Raspberry Pi 3B+. Video playback in OSMC is smooth but in Raspberry Pi OS it ...
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Hardware PWM not working in Ubuntu 20.04

I'm running Ubuntu 20.04 on an RPI 3b. I need both Hardware PWM channels. I added the following line to /boot/config.txt and /boot/firmware/usercfg.txt: dtoverlay=pwm-2chan,pin=18,func=5,pin2=13,func2=...
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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 ! ...
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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. ...
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RPi Zero 2: What is the black part next to GPIO 26?

I ordered a Raspberry PI Zero 2 a while ago. Today I wanted to use it the first time. I inserted a SD card with Raspberry Pi OS and powered the Zero 2 with an iPhone power supply. Nothing happened. So ...
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raspberry pi 3 B v1.2 not booting no led light and heating on the backside

I haven't used the pi for a few month now , it was stored in good condition. so yesterday i flashed the SD card with rasbian bullseye and booted up the pi. every thing was normal except the wifi , i ...
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How to assign one input when matrix keypad key is held down?

I have a simple matrix 3x4 keypad that executes a function based on the code entered. However I'm running into the issue when someone holds down a key. I would like it to where only one value is ...
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Raspberry Pi 2, repair hardware damage

I bought two damaged Raspberry Pi 2s. Both don't boot regardless of the SD cards content (SD card is working in different Raspberry Pi). Both LEDs are steadily on. The previous owner told me that the ...
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Make case fans work RaspberryPi4

I've loaded my RPi4 with CentOS7 I also bought a case with fans that you can attach to the pins on the pi. I'm not sure where to start looking for the software modifications I need to make in order to ...
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Erratic GPIO event callback

I have a Raspberry Zero connected to the SO pulse output of an energy meter (ABB C13) using a direct connection to GND and GPIO13 configured as input with pull-up resistor, and a Python program with ...
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LPM raspberry pi 4B extinction mechanism

I am contacting you because I would like to know how the LPM (Low Power Mode) mechanism works on the raspberry pi 4B. In order to take advantage of this feature, according to the documentation put ...
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Raspberry PI B schematics and hw drawings

I was digging in my stuff, and found a bunch of RPis. From what I can tell, they are pretty old - circa 2011,2012 Raspberry Pi B. Visual identifiers are: RCA and 3.5mm audio jacks are near the GPIO ...
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RPi 3 as media center powerful enough for video services?

I have now been running my RPi3 for years as a media center. I have always been very happy with it. I used it mainly to organize and play my considerable music library using Kodi. Lately I started to ...
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RPi4 Broken Resistor

I have RPi4 8Gb, and accidentally, i broke a resistor on my Pi board and i want to replace it but i don't know the value of this resistor, so what is the value of this resistor i mentioned in picture ...
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Can I determine model specific deploy details?

A class I TA for uses Raspberry Pis for a project we assign the students. The various pis we hand out are a mix of model 3B and 3B+. We're running into an issue with some of them and think a potential ...
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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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Measuring Hardware Performance Counters with perf_event_open on RPi 3

I am under RPi 3, Linux Rpi 4.9.80-v7+, perf version 4.9.82, and I have a deterministic code with a fixed input data, that runs a sort algorithm. I need to capture the runtime information of this code ...
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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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Pi can't make WiFi, Bluetooth and USB device detection work and boots in command line every time. Is there a possible fix?

My Raspberry Pi 4B 8GB RAM has TwisterOS. A power outage happened and then the Pi boots in CLI only at first. I have to execute 'startx' everytime I boot. Then some of my settings were changed, like ...
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Does the CM4 Lite hardware support UHS-II SDcards?

Can a UHS-II class SD card with 8-bit data bus and 1.8V signaling be used with the CM4 lite? The CM4IO board clearly only connects 4 data lines and 3.3V to the SDcard socket, but could this be ...
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What sensor can I use for detecting a metal type without the use of magnets? [closed]

I am searching for a method to detect the type of metal of something solid and small and thin. The test surface is approx 4x2 cm with a thickness of maybe a few millimeter. I cannot use magnets in ...
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Pi4 won't boot - 3 long / 3 short green flashes

My Pi4B wouldn't boot up the other day and have been trying many different things with no luck. I have everything unplugged from it except the official power supply. With or without the SD card ...
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Message printed multiple times when pressing hard button with RaspBerry Pi

I'm trying to print a message every time a button is pressed, and so far it's working fine, but the message is printed several times (somewhere around 4000 times) and I'd like it to be printed only ...
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Troubleshooting help? PiZ2 - USB not working

I just got a new Raspberry Pi Zero 2W, and setup a bootable 32G card no problem. On first boot, I see the Setup screen via HDMI, and I can SSH into the pi-user from my PC. But it is not responding at ...
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Why did Pi-4's port layout change?

If you look at a Raspberry Pi 4 B from port side the side of the USB ports, it's a striking difference to previous B-models that USB block and ethernet jack have switched places. To me this is a ...
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Design of Pico hardware divider

I recently found out that Pico has "8-cycle signed/unsigned divide/modulo circuit, per core" [1]. To my untrained embedded eye this seems very fast, does anyone know how they did it? What ...
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Raspberry Pi Desktop trackpad issue

I hope that this is the right place to ask Raspberry Pi Desktop (https://www.raspberrypi.com/software/raspberry-pi-desktop/) questions. If not, please feel free to direct me to the right Exchange. I ...
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How to use ctr + alt

So I am German and usually "ctrl + alt + Q" makes the @ (email) symbol. On my Raspberry Pi 4. However, after changing the keyboard language to German, I can't seem to access any characters ...
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Can I add a second processor to pi 4b 8gb? Is it even possible?

I want to get more than the most possible performance out of my pi 4b. I was looking around, and I saw it was possible to get just the processing unit for the pi 4 without the rest of the pi. I ...
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Sharing my keyboards across multiple computers

hope this finds you well. I was watching a video on YouTube, I think the channel was Linus tech tips and one of the guys was using something like a hat to check his brain waves or something of that ...
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Does the RPI v2 B and the RPIv4 B have the same pinouts?

Question: Do the RPI v2 B and the RPIv4 B have the same pinouts? example: https://www.etechnophiles.com/wp-content/uploads/2021/01/R-Pi-4-GPIO-Pinout-1-768x572.jpg?ezimgfmt=ng:webp/ngcb40
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Best way to add a button to a RPI4 case

I need to add a single button (mostly for safe shutdown, but I'd also like to hook some scripts to run pre-shutdown) to my RPI 4 builds, however most RPI cases under $20 don't seem to have a place to ...
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Children: Concerned with lead and other substances in handling a Raspberry Pi without case?

Most electronics are able to use lead and other toxic substances at levels that are safe to use because people don't normally touch the insides. A lot of Raspberry Pi components have no case, may be ...
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Use DSI1 instead of DSI0

I made a CM4 carrier board, but it seems I have made a mistake. I used DSI0 as the main display, but according to the official Raspberry Pi 4 schematics the DSI1 is used as display 0 (this is really ...
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Is it possible to have console/SSH-like communication between 2 RPis/RPi and Linux machine using RF transceivers?

I am currently working on a project where a Raspberry Pi will be used to run an nmap scan on a (purpose built) wireless network, and then attempt to exploit vulnerabilities found on the network. The ...
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Pi Zero extra I2C pins

My use-case is to have multiple sensors with the same I2C address attached to the PI and also a LED screen that I want to attach on it's own. I found that there is a software level overlay BUT it is ...
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how to control raspberry pi camera from bluetooth selfie button

i bought bluetooth selfie button, so i control pi camera throw bluetooth button. how do i control. i follow this website instruction. i successfully always connect button via raspberry 4 GUI. showing ...
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Network Resillience Options

I didn't see an obvious post, I want to put up the question here before rolling my own solution / help others. I have a rpi at a remote location that suffers frequent power outages triggering a race-...
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Change DVFS scale on raspberry pi in real time from the CLI?

I am creating an app that will showcase the power efficiency of the raspberry pi with different DVFS scaling. I am wondering whether there is an option to change the settings from the CLI, since that ...
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Micro HDMI to VGA and VGA to HDMI adapter

i have VGA cable i try to connect raspberry pi 4 with Micro HDMI to VGA and VGA to HDMI. display doesn't showing anything. what setting should i use.
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is it possible to control the Fan from GPIO?

am a programmer with no hardware knowledge background and defently no physics background. I have a RPi4B and bought a fan bundled with its heatsink. I realized the fan is basic and has 2 female pins ...
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How can a Raspi 3B+ simply stop booting, and how can I recover it?

I've recently run into a strange issue with my fairly new (< 1 year) Raspi 3B+: Yesterday evening it simply stopped booting! The red LED shines, and the 3.3 V and 5 V GPIO pins still supply ...
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What is the name and specs for the RPi CM 4's GPIO connectors?

I want to use a compute module for a personal project; but I don't know the name of the connector that is used for the GPIO/SPI etc. It is the one pictured here In the spec sheets, I see the pin out ...
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How to persistent write to registers?

I'm trying to "hardware-lock" some software written for the Pi and ensure that even if someone clones the SD card, they're unable to run a particular piece of code if it's not on an "...
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lightning bolt issue raspberry pi 4

I'm using raspberry pi 4 model B, unfortunately, I got a lightning bolt at the right corner I searched online about this issue and I found a lot of topics that explain the issue I tried to replace my ...
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