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13 views

Busybox init, is it possible to delay execution of init.d script conditionally?

I would like to boot into a python app. My python app has the excellent pigpiod daemon as a prerequisite. I am using Busybox init process. I have a pigpiod launch script /etc/init.d/SXpigpiod and my ...
0
votes
1answer
53 views

Raspberry pi 3B+ won't boot, solid red light

My Pi won't boot, I was coding my Pi when my friend came and wanted to see a movie from the Pi, I shut it down normally and close the power supply, then changed the SD card that had kodi on and tried ...
1
vote
0answers
21 views

uv4l usb camera stream not working

I am using a raspberry pi 3b+, trying to make the usb camera work with uv4l streaming. These are the packages I've installed: uv4l uv4l-raspicam uv4l-raspicam-extras uv4l-server uv4l-uvc uv4l-...
1
vote
1answer
25 views

How do I reinstall Python 3?

I cannot get pip to work and I think that reinstalling python 3.7 might help. When I try 'sudo apt install --reinstall python3' I get an error saying there are unmet dependencies. If I specify it to ...
1
vote
1answer
298 views

How can i install OpenCV on Raspberry Pi 4 (Raspbian Buster)?

I have tried many days to install OpenCV on my Raspberry Pi 4 with Raspbian Buster but i couldn't get it done. The installation always works but when importing or using cv2 methods like cv2.imshow(), ...
1
vote
0answers
22 views

How to control Midea HVAC (not standard) using Raspberry Pi

I have a Midea duct HVAC that has only the option of wired thermostat remote and it's not smart. I want to build something smart so I can turn on / off the AC or the heating remotely, but I don't ...
0
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0answers
17 views

Is it possible to bluetooth packet using onboard in Raspberry Pi?

I'm trying to sniff bluetooth packet of nearby smartphone. There are plenty of guides, but they just show the number of bluetooth devices like this: Scanning for BLE devices (5s) ... Found 2 BLE ...
1
vote
1answer
29 views

Put HDMI monitor in Sleep Mode

I have a raspberry pi running Debian. I want to set up a cron script so that the screen automatically goes into sleep mode (no power) at a given time and goes out at another time. The built-in ...
0
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0answers
28 views

Access Point consumption

I'm using my Raspberry Pi as an access point and I was wondering : how does it work ? What is the protocol for an access point to be visible from other devices ? How much data they have to transmit ...
0
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0answers
18 views

PiCamera with TensorFlow using parallel programing

I would like to run a continuous stream with the PiCamera on the Raspberry Pi 3 and also do other computations in parallel with this stream. I only have to take from that stream(process) the object ...
1
vote
2answers
55 views

Raspberry Pi4 extension to PCIe

Is it possible to extend the Raspberry Pi 4 to provide a PCIe connection? I have a PC which has as only purpose to play music using this Soundcard (no Linux drivers that work well) "PCI Express X-Fi ...
0
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0answers
17 views

error while opening the default python3 install in raspbian

well, i have been using python3.4.2 for sometime on my raspbian os however recently i tried to change the default to 3.7.2. unfortunately i failed to do so... i downloaded it but i couldn't make it ...
0
votes
1answer
31 views

Fluctuating SCLK voltage with increase in frequency

Raspberry pi newbie here. As part of my academics i was working on Raspberry Pi 3 B+ , Raspbian OS kernel 4.14.98-v7 and i was testing protocols and i am stuck at SPI. I am running spidev_test.c from ...
1
vote
1answer
38 views

pi-4 cryptsetup benchmark output?

On the pi-4 what is the output of "cryptsetup benchmark"? I want to asses its performance compared to the pi-3. Apparently the new "quality standards" require this question to be needlessly verbose ...
1
vote
2answers
138 views

Why doesn't the RPi 4 power on when RUN pin is grounded?

I'm trying to power on a RPi 4 using the RUN pin. The RPi is runing LibreELEC (Leia) 9.2 ALPHA1. I tried shutting down the RPi from LibreELEC's GUI, then grounding the RUN pin for a second by ...
2
votes
1answer
45 views

POE without the Rpi Hat?

I have a raspberry pi 3b+ with the 4 PoE connectors. How can I power the Pi with Ethernet without buying the PoE Hat? Is there a link to a schematic for the PoE hat? I need a different board on top of ...
0
votes
0answers
84 views

Text to speech errors

I try to make a python script for Raspberry Pi 3 B+ with Raspbian to speak text I input. I use pyttsx3 library but I also tried espeak from command line. Every time, the sound is very laggy, it start ...
0
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0answers
21 views

Error mounting system-managed device /dev/sdb1

I'm making a zip file with Python, but the process is interrupted. dev/sdb1 is already mounted but this error: Error mounting system-managed device /dev/sdb1: Command-line `mount "/home/pi/hrc2"' ...
0
votes
1answer
32 views

Water Sensor Pull_Down

I've got the classic Iduion Water Sensor (Link) and I want it to simply detect the presence of water but I get unreliable readings when using it like this: import RPi.GPIO as GPIO import time GPIO....
0
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0answers
7 views

Permission Problems with Motion

I'm new to the field and wanted to use Motion to turn my webcam into a surveillance camera. But I can't start Motion. I always get this error message and I don't know what to do. I'm grateful for any ...
1
vote
1answer
22 views

Detecting the same RFID tag twice

I have a problem with the MFRC522 library. It seems to me that after the tag was read / written one time correctly, in the next cycle the library always returns 2 on the check whether a card is ...
0
votes
0answers
22 views

php file not executing python script when called through browser

I have an apache2 webserver running on the pi. I have a php file that uses exec() to run a python script. Everything works well from the command line. when loaded through the browser, the exec() ...
2
votes
2answers
34 views

Is there a way to physically disable wireless networking capabilities?

I'm looking to create a cheap air-gaped computing device to store and utilize sensitive data like cryptocurrency wallet addresses or PGP keys. Now, I'm a total newb when it comes to Raspberry Pi but ...
0
votes
0answers
5 views

OPUS audio files not seen on OSMC 2019.04-1

My OSMC 2019.04-1 install on a RPi2 does not list, and hence does not play, any .opus audio files from my DLNA server. Other audio formats like .mp3, .flac, .m4a and .ogg are listed and do play fine. ...
1
vote
1answer
60 views

How do I build Qt's mysql-plugin on Raspbian Buster

I try to build the MySQL plugin on a Raspbian Buster with C++ and Qt 5.12.4. Building Qt itself worked fine by following this tutorial: https://www.tal.org/tutorials/building-qt-512-raspberry-pi ...
2
votes
0answers
44 views

Raspberry PI infrared remote

I have been trying for the past week to make a simple system to switch my air conditioning ON/OFF based on raspberry pi. I have my IR VS1838B infrared receiver, and a small circuit build out of a ...
0
votes
0answers
25 views

Control Raspberry Pi Zero via router

I have a Raspberry Pi Zero, non-wireless connected via USB to my router. I have Raspbian Jessy Lite installed on it. Is there any way to use my routers USB port to communicate with the Pi wirelessly?
0
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0answers
29 views

Performance of OS install on SD vs USB 3

I was wondering if I should think about installing the OS on a USB 3.0 stick and using the USB 3.0 port rather than the Class 10 Micro SD card to enhance read/write speeds. Is there a performance ...
0
votes
0answers
14 views

Raspberry Pi 3b+ black screen after start

My Raspberry Pi 3B+ hat the problem that VNC can't display the desktop. SO I connected it to a display and I had a black screen. I can boot the system and can see the normal boot screen (Press "SHIFT"...
1
vote
0answers
18 views

HDMI @ 1920x1080 and 3.5" TFT @ 640x480 Retropie

Does anyone know how I can set 2 different resolutions? Like have my HDMI @ 1920x1080 and 3.5" TFT @ 640x480. So that when my tft is by itself it displays the proper resolution and when it's hooked to ...
2
votes
1answer
101 views

Pi can't find 5th DS18B20

I am new in raspberry pi. In my research project, I would like to monitor ground temperature at 60 points. My team decided to set a monitoring system using raspberry pi. As a preliminary test, I ...
0
votes
0answers
26 views

I need help getting python 3

How do I get python 3 on the programming section on the main menu. I have tried watching multiple videos but I can not find anything that works
0
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0answers
18 views

Raspbian boot options: Desktop autologin

I was installing dlib to my raspberry pi 3b+. I changed the swap file size from 100mb to 1024mb in the "/etc/dphys-swapfile" file. After this, I changed the boot menu option to directly start the ...
0
votes
1answer
45 views

Running Hologram cellular network from startup issues [cannot run on rc.local or .bashrc]

I’m playing around with the hologram Nova cellular USB kit and I’m trying to create an automatic connection using the /etc/rc.local file. Hologram uses it's own way of connecting to a ppp0 network ...
4
votes
1answer
40 views

gcc does not compile code that compiles in 'as'

I'm trying to learn assembly using the raspberry pi. I have code that compiles using as but will not compile with gcc. I thought that as was the backend for gcc assembly so I'm confused why it is not ...
5
votes
1answer
188 views

Automatically Create Hotspot if no Network is Available

I want to automatically create an access point, if there is no network found, so that I can connect to my Raspberry Pi everywhere. If nobody is connected to the hotspot for a while it should search ...
0
votes
2answers
21 views

ssh in local LAN: works with IP, but not by name

On a local LAN, I am trying to ssh into a freshly installed Raspberry Zero WH, by host name. I am connecting from an Ubuntu box. The Rasbperry Pi does boot, and connects to the Wifi. I can see it in ...
0
votes
0answers
18 views

Audio noise generator

Is there a package or hardware for a Pi that will generate real audio noise ie noise whose average over time doesn’t tend to a fixed value. White noise won’t do, since it’s average tends to zero.
0
votes
1answer
55 views

SSH does not work on Raspberry Pi 3

What is the magic required to make SSH work. I have booted into my Pi and enabled SSH under the settings. I know the IP address of my Pi which is static, I have tried on Windows with Putty and via ...
0
votes
0answers
24 views

How can I mount a speaker on to a Pi so that it is light enough for it to be mobile

Can I mount a speaker on a mobile Pi robot together with a suitable power supply? Ideally I’d like the Pi to follow a fixed route while emitting a fixed repeating tone.
1
vote
1answer
44 views

Raspberry Pi 3B+ no wifi interfaces when setting up for first time

I have followed the instructions to create my SD card and boot it on my Pi. When creating the SD card I have added the ssh and wpa_supplicant files. During the initial installation at no time am I ...
0
votes
0answers
15 views

Simulate a mouse click in python tkinter

I have a tkinter GUI running on a Pi 3B+ with a 5" tft touch screen display. I am writing my own touch screen driver. The GUI works when I mouse click on a button that is bound to Button-1. self....
0
votes
1answer
22 views

NOVA USB touch panel is working with raspberry

I need to use one touch panel for my LCD monitor 32 inch, so i found this kind of NOVA USB touch panel : in the description it said it is working with Linux OS and working without needing to any ...
0
votes
1answer
24 views

Raspberry pi 3 Whatsapp

I installed whatsapp on raspberry pi 3, but can't find information how I can use it in python script. I want to use it for door open/close python script. I have script working with email, but email ...
4
votes
1answer
55 views

How to Monitor GPIO Input Indefinitely Without Recursion

I actually joined StackOverflow to ask this question because I wasn't sure it was RPi specific, but as I was thinking about how to form the question, I realized it might be GPIO specific (for some ...
1
vote
1answer
44 views

Startup files on raspberry pi 3

I have 4 python scripts running continuously. How I can open them in separate windows on startup? I need see the terminals when it's booting up. I tried rc.local: it's working but I can't see the ...
1
vote
1answer
34 views

a python GUI application to display some measured value (with Raspberry Pi)

I am developing a GUI (with python tkinter) application for a measurement system with Raspberry pi. I made the GUI and the code to do the measurement. But my question is how to link them together. ...
0
votes
0answers
62 views

Xorg not working after upgrading to buster

After switching to Raspbian Buster and rebooting RPi3 B+ boots into a shell. (I use the GUI so this is a bit odd) After typing in startx I get this error (I cutout a bunch of junk): (EE) no screens ...
0
votes
3answers
43 views

Automatically Connecting to Raspberry Pi 0 to a wifi without Screen and SSH

I have a raspberry pi 0, but don't have/don't want to connect to a screen/hdmi/SSH. I can plug my pi's sdcard into my laptop and access the raspbian installation files, so is there a way I can ...
0
votes
1answer
65 views

Can I plug my SD card from Pi 3 into a Pi 4?

If I upgrade the OS to buster on an OS disk (SD card or USB stick) on my pi 3, will it work if I boot a pi 4 off that?

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