Questions tagged [hardware]

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

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9 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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5 views

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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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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13 views

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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11 views

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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1answer
38 views

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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1answer
42 views

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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23 views

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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63 views

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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1answer
35 views

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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0answers
41 views

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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15 views

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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17 views

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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1answer
62 views

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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1answer
43 views

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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2answers
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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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27 views

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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1answer
57 views

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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14 views

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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1answer
35 views

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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1answer
60 views

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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52 views

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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1answer
34 views

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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31 views

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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1answer
51 views

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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2answers
356 views

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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1answer
63 views

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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1answer
38 views

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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3answers
73 views

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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0answers
45 views

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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27 views

RaspBerry Pi pwmchip0 doesn't always work

I'm in a project currently using the RPi's pwmchip0 to implement Hardware PWM. I added the dtoverlay = pwm-2chan in the cofig.txt. Now when I follow that explanation https://jumpnowtek.com/rpi/Using-...
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Is my pi4 dead and How to determine what exactly happened?

Apparently, I somehow bricked my new pi4. When I plug it in, the red (power) LED is working, but the green one (boot) is not. To be exact: when everything, including the SD card is taken out the pi, ...
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1answer
94 views

CIRCUITPY on RP2040 Won't Reboot and Run code.py

I'm trying to build this T9 Macro Pad project, by Guy Dupont, using a PIMORONI TINY2040, which uses a RP2040 chip. I installed CircuitPython 6.3.0 on the development board and then could see the ...
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1answer
42 views

What causes Linuxes on Raspberry Pi to not be able to be installed with an installer?

If you download an ISO for a Linux distro for x86 and burn it onto a disc or USB stick, and put that device into the target computer and start it up, it shows an interactive installer. If you want ...
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0answers
30 views

heartbeat sensor for pi

i want to measure the heartbeat using the pulse sensor. i connected the pulse sensor to a mcp3008 adc and the pi. this is the code i used from pulsesensor import Pulsesensor import time p = ...
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3answers
176 views

power the logic circuit of an external component with an external power supply instead of the raspberry pi's GPIO

I want to know if is it possible to power the logic circuit of an external component used with raspberry pi not in the way shown below (using the 3.3v or 5v ang GRND GPIO), but with an external 3.3v ...
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26 views

Interface Contact Image seneor with Raspberry pi

How can we connect Contact Image sensor (hp/canon) With Raspberry pi Directly. Actually I want to make a scanner only by using Raspberry pi and Contact image sensor. Do i need to use extra modules to ...
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2answers
235 views

How to detect low amp AC current with GPIO

There is switch inside a commercial gate operator that I need to monitor with my RasPi. The switch has two ~18 AWG wires, when the switch it closed, it's 50V AC connection. When the switch is open, ...
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0answers
30 views

Which bipolar stepper motor can be used with EasyDriver4.5V A3967?

I have EasyDriver 4.5V A3967 driver and planning to purchase 12V bipolar stepper motor with specs phase: 2 phase voltage: 12 V current: 0.7 A. Phase resistance: 4.0 ± 10% Ω phase inductance: 3.2 ± 20% ...
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2answers
125 views

16 Channel Sainsmart relay board connected to raspberry pi zero w, hydrosys4 app not stopping relay / turning off relay

Within the Hydrosys4 app Settings page in the actuators test section I can set the app to pulse the GPIO and I get the LED indicator on the relay board and the relay engagement but the relay does not ...
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1answer
628 views

Sainsmart 12V, 16 Channel relay module connected to RpiZW has unwanted triggering when booting

I'm trying to get the hydrosys4 open source irrigation control software to work with my 16 channel relay board and raspberry pi zero w. When the pi boots up the relay is triggered multiple times, ...
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1answer
318 views

I2C communication error: OSError: [Errno 121] Remote I/O error while using PAJ7620 sensor

I know this question has been asked a bunch of times. But, none of the answers was able to resolve my problem... I'm hoping I could get some guidence from awesome people in this community. Thanks in ...
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1answer
34 views

any way to know the real time status of speaker is it playing any sound through cli?

Recently i want to create a service on my pi which additional logic, one service needs to be stopped when the speaker is playing any sound. Any way i can get the status like a system log file about ...
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42 views

Popping sound Adafruit MAX98357 with Raspberry

I have a problem using MAX98357 Audio Amp from Adafruit with Raspberry Pi 3 B+. Every time a new sound begins, there is a popping noise that comes out of the speaker. I tried to do the fix that they ...
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43 views

Can I use the Sixfab 3G-4G/LTE Base HAT while also using this I2C Shield with my raspberry pi 4?

I am trying to create a remote weather station but have a problem, apparently I need a HAT that will cover my GPIO pins as well as a I2C shield to connect to my weather monitoring hardware. ...
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1answer
59 views

Correct way to wire resistors

I have a project where I use pins of PCF8574 expander placed on a breadboard and which is connected to Raspberry Pi. Pins of the expander should be connected forward to the ones of STM8 ...
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1answer
121 views

Can I connect over 15 Bluetooth devices with raspberry Pi 4B 4GB ram using usb Bluetooth apapters

I have a raspberry Pi 4B 4GB ram and I want to connect it to 16 Bluetooth oximeters(BLE) and take readings after every 20 secs. Now I know that pi can connect to only 7-8 Bluetooth devices at a time ...
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1answer
222 views

What is this 8-pin fpc place On RPi 4?

I was looking at my Raspberry Pi 4B and I saw something like a not soldered place for fpc connector and I got curious what is that!??? just Look under USB2 at top right corner in the image bellow.
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1answer
28 views

Connection/Voltage-Detection/Voltage and Current Regulation

I'm using a Raspberry Pi zero for a drone. The Pi will be powered by a 11.1V battery. To reduce the voltage and current going into the Pi I'm thinking of using a buck boost converter. If I use this ...
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0answers
35 views

Raspberry Pi unusable

I don't know why but my raspberry had a problem who make it restart every 15s... I try to re-install an OS after have format my SD card but it happen again... I see an little ligthning in the top ...

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