Questions tagged [hardware]

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

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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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25 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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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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43 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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95 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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44 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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29 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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60 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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35 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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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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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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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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Raspberry Pi 3 USB to HDMI converter

I'm wondering if I could set up a Rasp Pi 3 up as a converter for a USB webcam to output as an HDMI source. Preferably once done, the program will run automatically once the Pi is turned on. Which OS ...
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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
78 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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71 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
375 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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97 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
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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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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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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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57 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
41 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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Respeaker 4 mic array setting up error for Raspberry pi

I am trying to set up a microphone to my raspberry pi model 3b. I ordered the ReSpeaker 4 mic array for it but I am having trouble setting it up. I am following the instructions in (https://wiki....
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206 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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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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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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How to recognise which button is pressed in ir remote using lirc raspberry pi?

begin remote name Samsung_BN59-01175B bits 16 flags SPACE_ENC|CONST_LENGTH eps 30 aeps 100 header 4676 4367 one 685 1557 zero ...
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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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65 views

RS-485: UART configuration for 10 Mbit/s

I would like to use an RS-485 transceiver (e.g. SN65176BD) with my Raspberry Pi 3, to communicate on a network operating at 10 Mbit/s (a common speed for RS-485 networks). Using an unmodified ...
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34 views

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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61 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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1answer
52 views

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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1answer
446 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 ...
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27 views

Raspberry Pi 4B or IO Boards + Compute Modules 4 for a raspi cluster?

I am currently thinking of building a small home cluster using raspberry pi hardware and planned on using Raspi 4B's but then came across those IO Boards in combination with compute modules. I was ...
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23 views

Setting up the hardware on a Tor server

I live in the UK and have a BT broadband router on which I run a TP-Link 1GB Ethernet hub router, all of my computers run over the TP-Link 1GB Ethernet hub router, which connect to the BT broadband ...
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188 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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3answers
211 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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196 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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1answer
144 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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1answer
87 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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45 views

What connector is used for the keyboard on the Raspberry Pi 400?

I'm trying to find out what is the connector used to connect the keyboard on the Raspberry Pi 400 to the board. But doing a Google search of Raspberry Pi 400 internals only shows the results (in the ...
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1answer
36 views

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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16 views

Looking for a "high resolution" LED strip

I'm trying to find a high density addressable led strip, mean as many LEDS crammed as close together as possible and their colors can be changed individually. I want to make a spinning blade of LEDS ...
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45 views

7" LCD POWER options

I have a question about powering a 7" LCD. It should be a rather intuitive answer, but I really don't want to risk my screen on the off chance that I'm wrong. While experimenting with things this ...

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