17,504 questions
Best practices
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votes
4
replies
82
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On a raspberry pi/arduino: how can I manualy control a 5V fan on/off?
I am quite new to electronics and would like some advice on how to manually turn on/off my 5V DC brushless fan based on the temperature of my pi.
- reputation score 1
Best practices
0
votes
1
replies
69
views
Which cache level best proxies DRAM traffic on Raspberry Pi 5 (Cortex-A76) for single-threaded perf measurements?
I'm running a single-threaded convolution benchmark on a Raspberry Pi 5 (Cortex-A76, 4 cores) and using perf stat LLC miss counts as a proxy for DRAM memory traffic. I want to understand which cache ...
- reputation score 1
Best practices
0
votes
2
replies
82
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How to wire multiple sensors to a raspberry pi?
I am quite new to electronics and would like some advice on how to connect a BME-280, MPU-6050 and a Fan circuit (two wires) to a raspberry pi since they all require the same pins.
I have already set ...
- reputation score 1
Score of 0
1 answer
99 views
MQTT messages received in Node.js container but not delivered to browser via SSE (Docker on Raspberry Pi 5)
Problem MQTT messages are successfully published to the broker and received by my Node.js container (confirmed in logs), but they are never delivered to the browser through Server-Sent Events (SSE). ...
- reputation score 11
Advice
0
votes
4
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70
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Raspberry Pi shows "HDMI no signal" when TV and Pi power on simultaneously, but works if TV is already on
When I power ON both the TV and Raspberry Pi at the same time TV shows “HDMI1 no signal”
If I turn ON the TV first and then power the Pi display works perfectly
Sometimes the Raspberry Pi boot logo ...
- reputation score 1
Advice
1
vote
2
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62
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Performance and Compatibility of Rock Pi 4C+ vs Raspberry Pi 4 for Edge AI (YOLO/OCR)
Does anyone ever use Rock Pi? Does it function the same as Raspberry Pi? I just found the Rock Pi as an alternative for my final-year project. Is the Rock Pi a good alternative? My project is related ...
- reputation score 1
Score of 0
1 answer
83 views
System.IO.IOException Error 121 on Raspberry Pi I²C with PCF8574 LCD using .NET
I am trying to connect a Raspberry Pi to a Midas MCOB21605G1V-EYP display with a soldered HW-61 board using I²C.
The VCC pin of the HW-61 board is connected to a Wago splice connector. This connector ...
- reputation score 1
Score of 2
2 answers
162 views
Curl C/C++ library based application produces erroneous response for HTTP POST request
I use the following block of code to download some data from a server:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include "../...
- reputation score 625
Advice
0
votes
0
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40
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Choosing the right Raspberry Pi setup for mmWave presence detection and voice interaction (research project)
I’m currently working on a research project where I plan to use a Raspberry Pi to build an indoor system that can detect whether a user is present in a room and interact with them through voice.
The ...
- reputation score 11
Best practices
1
vote
2
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74
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Minimum hardware requirements for running Raspberry Pi OS on VirtualBox
I am trying to run Raspberry Pi OS inside VirtualBox, and I’m not sure about the disk size or the overall minimum requirements. So I'm asking if (2 GB, 2 CPU, 20 GB Disk) is enough for smooth use.
Or, ...
- reputation score 11
Best practices
0
votes
0
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83
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Deploy Python application to Raspberry Pi automatically using Azure DevOps CI/CD
so, I have a repository in Azure DevOps that contains Python scripts for a Raspberry Pi application. I build the project using PyInstaller, which generates an executable inside the dist/ folder.
...
- reputation score 23
Score of 2
1 answer
110 views
ModuleNotFoundError: No module named 'board' when run with sudo
I am trying to control some leds with my Octopi/Octoprint Raspberry Pi. I found a python script for it here. I managed to create a venv and run my script from there.
First I tried GPIO 17 for the data,...
- reputation score 1456
Score of 1
0 answers
106 views
How to switch to Arm Exception Level 1 on the Raspberry Pi?
I am currently working on a small 64bit "kernel" for the Raspberry Pi 3B. Everything I have runs just fine as it is. I am currently trying to switch Exception Levels to operate in "...
- reputation score 11
Advice
1
vote
1
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104
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Need advice on extracting data from PV inverter loggers (Sungrow, GoodWe, Solis, Huawei) using Raspberry Pi
I’m currently working on a fairly large-scale solar monitoring project and I could really use some guidance from people with experience in inverter communication / data acquisition.
The setup involves ...
- reputation score 1
Score of 0
0 answers
50 views
Why spidev.SpiDev() is creating an error on RPi 4b?
I have two RPi 4b boards and two NRF24L01 PA modules.
The goal is to connect two Raspberry Pi 4b boards via NRF to send and receive signals.
I am trying to follow this atricle.
I only changed from ...
- reputation score 25