Questions tagged [hardware]

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

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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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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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1 answer
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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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2 answers
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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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110 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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1 answer
237 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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1 answer
41 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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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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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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265 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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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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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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3 answers
356 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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2 answers
485 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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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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246 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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1 answer
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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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1 answer
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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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1 answer
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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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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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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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1 answer
682 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 ...
2 votes
1 answer
267 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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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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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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0 answers
137 views

Serial console to Pi 4b shows no output

I am trying to connect to the Pi 4b 8Gb via serial console, however, although I can connect to the serial adapter itself, I can't seem to get no output at all from it, nor using default raspbian ...
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2 answers
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How can I get a Unicast Mac Address for a regular mac XX:XX:XX:XX:XX:XX?

I presume that the vendor supplied router is fairly old and hence this trouble. I want to set a static IP address for my media centre, though I have the regular MAC id, the router insists that I add a ...
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1 answer
107 views

Is ubuntu 20.04 compatible with raspberry pi 400?

I use a usb 3.0 for mass storage (with boot). But my OS (ubuntu 20.04) is very slow. What can I do to make it faster ? (I'm on raspberry pi 400)
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How can I use a computer to control a wired / wireless PWM controller to control the speed of a dc motor

How can I use a computer to control a wired / wireless PWM controller to control the speed of a dc motor (I will be testing both wired and wireless to test response) I have a DC motor 6-12v mini DC ...
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What is the best codec and library in order to achieve wireless video and audio transmission through Raspberry and LoRa?

I am currently working on a project where i want to create 2 wireless push to talk voice transmitters. I paired 2 Raspberry Pi with 2 LoRa antennas respectively in order to achieve that. However i am ...
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2 answers
1k views

Canakit fan that came with raspberry pi 4 louder then usual

So I have a raspberry pi 4 running 24/7 (to keep my discord bot running). I noticed recently that the fan that came with it (from Canakit) seems to be louder than usual. Should I be worried? I have it ...
1 vote
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576 views

GPIO INPUT is always HIGH

I am working on a project with HC-SR04 Ultrasonic sensors. I am a beginner in raspberry-pi. I have 3 sensors which are calculates the distance. But one of them has problem which is echo (input) pin ...
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3 answers
1k views

Use a usb-c charger with variable voltage for charging Pi4 [duplicate]

I have read here that is possible to charge you pi4 with 3rd party chargers that supply 5V 3A. I am wondering if I can use this 20W charger, which can deliver differnet voltage level (5V/3A, 9V/2A, ...
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2 votes
1 answer
934 views

Problem with 1-Wire devices not showing up on GPIO4

i hope you're having a nice day. For a project i want to implement 1-Wire communication in a Raspberry Pi Zero W. The goal is to use a Maxim Integrated Max17313 Fuel Gauge for inspecting battery usage....
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1 answer
320 views

Raspberry pi 4 crashes when opening VLC, Openshot, or RPI-Imager

I am using a Raspberry Pi 4 model B 4gb, and any time I open the apps stated above, the window opens, it doesn't display anything, the window is super huge and crashes. Multiple times has this ...
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1 answer
178 views

What is the default pin mode for GPIO 7?

I thought that all of the GPIO pins defaulted to input but I'm seeing that GPIO 7 (so is GPIO 8) is set as an output after boot up. Is it being used by something? If I take it over will I cause ...
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Stepper motor code - GPIO.LOW not needed?

I am following the Freenove code (ref:- FNK0020 page 202 https://www.freenove.com/tutorial.html) to program a stepper motor. I have simplified the code a little, in any case as far as I can tell the ...
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2 votes
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Stacking up multiple grove base HATs on Raspberry Pi

I want to stack multiple Grove base HATs on a single Raspberry Pi. This is the HAT i am using https://wiki.seeedstudio.com/Grove_Base_Hat_for_Raspberry_Pi My application needs to interface 24 analog ...
3 votes
1 answer
522 views

Pi Zero W 1.1 - What kind of component is this? What does it do?

Unfortunately a component (see image, component is encircled in red) is broken/missing on my Pi Zero W 1.1. So far everything still seems to work, but anyway: Do you know what kind of component this ...
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1 answer
171 views

Every 24h, network connectivity ceases

Every day my Raspberry Pi 4 4GB loses ethernet (wired) network connectivity (I don't use WiFi on the device). The device is otherwise still functional, but no matter whether I down/up the interface, ...
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1k views

Can you use the Rpi compute module CM4 without the IO board?

I want to use the raspberry pi for some projects, although the normal pi is too big and I want it to be as compact as possible. I thought about using the compute module(without the IO board) since it ...

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