All Questions

0
votes
0answers
34 views

Teamviewer glitch with moving windows

I just installed TeamViewer on raspberry pi B 3+. I use the latest Version of TeamViewer on Windows(client) and on my pi(host). Now this happens when I move a window. And this stays till I click on ...
-2
votes
0answers
35 views

Taking more time to execute a single program

I have created a GUI program with PHP in raspberry pi. The program is running with a web browser. But the problem is that it takes more time (more than 2 minutes) to execute a single program. I want ...
0
votes
1answer
23 views

How to set up wifi with ubuntu 18.04.2?

I'm trying to use ubuntu OS on my raspberry pi 3 B+. I have formatted my microSD card to FAT32 and copied the ubuntu-18.04.2-preinstalled-server-arm64+raspi3.img. I am able to have the OS working. ...
0
votes
0answers
46 views

Raspberry Pi Chromium Browser freeze after video playback

I have a very simple html page, directly running from file (file:///home/pi/Desktop/myfile.html), which infinitely replays a video anytime it ends. Device: Raspberry Pi 3 Model B + 16GB SD Card OS: ...
2
votes
0answers
35 views

Waveform not cancelling out hardware PWM

I've run into problems using pigpio's wave generator in combination with hardware PWM. Currently I'm working on a motion control with acceleration/sustain/deceleration phases. The phases are saved ...
-4
votes
1answer
74 views

What capacity battery would I need to run a raspberry pi zero w for 10 years continuously?

It would run an alarm clock /time lock set up to send a signal or switch on a servo operated lock after 10 years. I don't know specs or power need for servo, might be separate system (and a separate ...
0
votes
1answer
95 views

How to create a master clock using a Raspberry Pi B+?

I'm trying to enable on an AD9833 (it's a DDS that can generate waves) using a Raspberry Pi 3 B+. I just want to know how to create a clock or master clock from the GPIO4 (GPCLK) of a Raspberry Pi B+...
1
vote
1answer
36 views

Power on a machine by pressing a physical button

There is a machine which usually runs in standby mode, and the only way to wake it up is by pressing a physical button with a small force and then quickly release. I want to remotely push the button ...
-3
votes
0answers
18 views

difference between the xcb plugins and eglfs

Please discuss to the difference between the xcb plugins and eglfs in the Qt for the GUI project building at raspberry (zero or ...) like this: or Every kind of xcb or eglfs plugins have what ...
0
votes
0answers
25 views

using registers instead of RAM, Raspberry PI 3 B

I am trying to adapt a C project about Elliptic Curve Diffie-Helmen key exchange, which uses registers, and when I tried to compile it, it says "there's no such registers name" My Q is what are the ...
1
vote
0answers
10 views

Linux headers missing from a custom kernel built through cross-compilation

Helo, I have followed the instructions given at https://www.raspberrypi.org/documentation/linux/kernel/building.md to build a custom kernel. (I have cross-compiled it on an x86 box.) The custom ...
0
votes
0answers
9 views

Caputing data from BluetoothLE sensors

I have been trying to grab data from BLE sensors using python. While the commandline tools worked flawlessly I couldn't get it to work with any other python framwork available for BLE. A collegue ...
2
votes
0answers
35 views

Image rollback using Raspberry Pi Bootloader

I'm using Yocto framework based RPi build and have created My SD card partition as follows, ======================== SD card with 3 parts ======================== | 68MB(bootloader) | 4GB(...
2
votes
1answer
28 views

Why no result from os.popen() when script is run from crontab?

When I run this Python3 script from the command line or from Thonny I get correct results. When I run it through crontab the variables ipaddress an ssid stay empty. Can anyone tell me why? Any ...
-1
votes
0answers
35 views

Still getting problem : “Network Error : Connection refused” problem

I am facing this problem even after trying many recommendations from this site. I am using windows 10, raspbian stretch lite(2019)/raspbian stretch(Nov2018) and I don't have a monitor. Earlier I could ...
2
votes
2answers
66 views

How do I find the IP address of my Raspberry Pi 3B+

I don't have a HDMI screen, nor do I have access to the router. From what Ive been told, it has Kali installed. I am connecting the Raspb directly to the computer with a Ethernet cable. I have tried ...
0
votes
0answers
30 views

How can I disable the serial debugging console?

I am using raspberry pi 3b model with android things. I need to attach GPS module NEO6mv2 with the pi. How can I disable the serial debugging console?
1
vote
0answers
20 views

Touchscreen xinput calibration not working

I want to calibrate a touchscreen named "eGalax Inc. USB TouchController" on my Raspberry Pi. I think X and Y axes of the touchscreen are inverted. I used xinput_calibrator for this purpose. When I ...
1
vote
0answers
30 views

Green LED blinks 4 times, no problem with SD card on other Raspberry, same problem with other SD card on same Raspberry

I booted and used my Raspberry for the first time yesterday. I used USB mouse, keyboard and monitor first, enabled ssh and vnc and established connections with my Windows laptop going forward. I did ...
0
votes
0answers
20 views

How to get LDR sensor reading in C language [closed]

I am currently working on a project using laser module, a capacitor and an LDR. After looking online, I found a library in Python called GPIOZero that allows me to do this directly, as follows: from ...
3
votes
1answer
37 views

netperf command doesn't exist on raspbian

I am trying to run some tests about network on my Raspberry Pi 3 B+, and I have raspbian on it. I installed flent via apt install flent, and I ensured that non-free repository is enabled. I still can'...
-1
votes
1answer
47 views

Is there a piece of hardware which enables hotplugging sensors to the breadboard?

The idea is the following: I have a Raspberry PI connected to a breadboard. To this breadboard, I would like to connect (digital and analog) sensors and actuators while the PI is running. Or remove ...
0
votes
1answer
44 views

Ethernet communication Raspberry PI and windows PC

I am working on project which involves sending datastream from raspberry pi to Windows PC. This should only be done through Ethernet link. I looked for ethernet libraries but i did not find any. Also ...
-1
votes
1answer
34 views

RASPBERRY PI Error Python GUI : “no display name and no $DISPLAY environment variable”

Hi guys I want to create a basic GUI with TKinter. This is my code from tkinter import* import tkinter.font win =Tk() win.title("Test") myFont = tkinter.font.Font( family = 'Helvetica', size = 12, ...
1
vote
1answer
44 views

Why is pigpio library not moving my servo when the same pin number works perfectly with RPi.GPIO?

I am working on a self driving rc car project and I need a servo to steer my car. As I was getting a bit jitter with RPi.GPIO I tried pigpio library. I am using a Raspbery Pi Model B. But it won't ...
-5
votes
1answer
58 views

No colors in terminal when booting raspbian in text mode [closed]

I am booting my pi as text with autologin. Even after modifying the bashrc file in the /home/pi folder, I still see the text in white. I know that the color is enabled, because during the boot, I ...
0
votes
1answer
25 views

i got error on rpi camera. Camera is good and i still got this error [duplicate]

I get these error messages: mmal: mmal_vc_component_enable: failed to enable component: ENOSPC mmal: camera component couldn't be enabled mmal: main: Failed to create camera component mmal: Failed to ...
-1
votes
0answers
24 views

How to display output from a facial detection code in python on an LCD display

I have made a facial detection app using Python on RaspberryPi. The code is working fine and writing the name of the detected person on the camera's screen but what I want to do is to display the ...
0
votes
0answers
24 views

RPI 3B+, Wifi super slow (10x slower than onboard) when using USB Wifi despite huge antenna

TL;DR, usb-wifi works, but it's extremely (!) slow compared to onboard wifi, even though the dongle has a big antenna and a a better signal quality. I looked far and wide and did all I could find, but ...
0
votes
1answer
41 views

How can I update from PHP 7.0 to PHP 7.1?

My /etc/apt/sources.list file: deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi # Uncomment line below then 'apt-get update' to enable 'apt-get source' deb-src http://...
1
vote
2answers
35 views

Voltage dropped significantly on GPIO 4 with a relay coil

I have a Raspberry PI 3 B+, and when I activate the GPIO 4 as output and checking agains a multimeter I get its 3.3V as expected. If I connect the GPIO4 to one end of a coil (http://www....
0
votes
0answers
28 views

How does the linux kernel handle interrupts [closed]

A few days ago I asked a question that had (probably) had to do with en interrupt being fired by an ENC28J60 chip (SPI) and messing with the UART buffer. See here. I found a software fix for this ...
0
votes
0answers
10 views

selenium.common.exceptions.WebDriverException: Message: connection refused

I ran a program with selenium from selenium import webdriver driver = webdriver.Firefox() driver.get('http://www.google.com') and this error accured Traceback (most recent call last): File "/...
-2
votes
0answers
22 views

Which one is better between `xcb` and `eglfs` on raspberry qt native built installation

I need to install and use Qt for my gui medical device (dental glazer furnace) part into my raspberry zero like this: SO I have tried cross compilation qt first which I have some problem which doesn'...
1
vote
1answer
20 views

init.d script does not run start on boot but starts manually (Raspbian)

Whenever the system starts, the zfs-import init script does not run: root@kapnet:# /etc/init.d/zfs-import status ● zfs-import.service - LSB: Import ZFS pools Loaded: loaded (/etc/init.d/zfs-import;...
1
vote
1answer
14 views

RC522 modules stop working when more than 2 are connected

So, here's a synopsis of what I am trying to do. I want to put 3 RC522 readers side by side inside of a book, facing the cover, that will be constantly on, using a Rpi zero W. When an RFID chip gets ...
0
votes
0answers
18 views

How to make mt7612u driver work on pi?

I'm trying to make my pi work with mt7612u driver, which is included in 4.19.y branch. But just got following error: [ 34.271279] mt76x2u: probe of 1-1.5:1.0 failed with error -22 [ 34....
-1
votes
0answers
47 views

Play raspberry pi sound through bluetooth speaker

I have Raspbian Stretch installed on my RaspBerry Pi Model 3B+. I paired the speaker using bluetoothctl, but I cannot see it in raspi-config (Advanced Options -> Audio) list. Also I tried several ...
0
votes
0answers
27 views

how to send data from rasberry pi 3 to android or smartphone? [closed]

please help me. how to send data / capture/image from rasberry pi to android or smartphone device rasberry pi 3 webcam smartpohone adroid xiomi note 4
1
vote
1answer
33 views

How do I know my PCF8951 is not broken?

I am using some PCF8951 board like this: I remove all the jumper, like this: This is every thing: Then I plug two senor board to this board. Everything plugs into AIN0 will get the correct value. ...
2
votes
1answer
33 views

How to connect 3V3 UART logic level to the 5 V RS232 C logic level?

How to connect the 3.3 V Raspberry Pi UART logic level to the 5 volt RS232 C logic level?
13
votes
8answers
7k views

What is the highest voltage from the power supply a Raspberry Pi 3 B can handle without getting damaged?

I am using Android things on Raspberry Pi 3 B with a 7-inch touch screen. Currently, I always see a yellow thunder bolt sign on the screen which means that the Raspberry Pi isn't receiving a high ...
-1
votes
0answers
19 views

Failure to build QT5 5.12.3 on Raspberry Pi zero : sub-plugins-make_first Error 2

Following the instructions in https://www.tal.org/tutorials/building-qt-512-raspberry-pi,: wget http://download.qt.io/official_releases/qt/5.12/5.12.3/single/qt-everywhere-src-5.12.3.tar.xz tar xf qt-...
1
vote
0answers
38 views

Getting button click type

I've been looking for a while to how to get the kind of click of a button on GPIO. Is it a single click? Double? Triple or more? Is it a long click? a very long click? a combination of them? I haven'...
2
votes
1answer
47 views

Simple python RFID (RC522) authentication system not working

I am a realative RPi noob so forgive me if this is a simple problem. I am making a keycard system with the RC522 reader, and I have everything wired up correctly. It works with writing and reading ...
-3
votes
1answer
37 views

Buying a new and different buggy chassis

I successfully made the buggy from the raspberry pi website: https://projects.raspberrypi.org/en/projects/build-a-buggy and I am happy with it because it works and everything. BUT the chassis is made ...
0
votes
0answers
16 views

Prevent Automount of Camera

I am about to build a photobooth with my Canon DSLR and a RasPi. Now when I plug the USB of the camera, raspbian will automatically mount it and prevent my command line scripts from using it (device ...
1
vote
0answers
56 views

raspberry pi3 + fingerprint

I'm looking for a way to connect fingerprint scanner with raspberry pi3 using python. I'd like to use only gpio or hat (not usb) interface. I'm searching for a while without figured out, so I've ...
-3
votes
1answer
55 views

software copy protection in raspberry pi [closed]

i need to ensure that even if my executable C/C++ codes are copied to another raspberry Pi (dumping the SDcard), they will not run there. what are the possible ways to do this. Update: adding "PI ...
0
votes
3answers
49 views

No route to host problem

When I attempt to connect via SSH from the Pi (client) to another machine (server) on a port other than 22 I get a "No route to host" error message: Successful SSH pi@raspberrypi:/opt/pihole $ ssh ...

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