Questions tagged [connection]

A connection describes a link between two systems where data can be exchanged.

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Unable to connect to any of the torrent indexers

I have freshly setup DietPi on my Raspberry Pi 4 (4gb). I had the same DietPi set up earlier for months and it worked fine but after this fresh installation, I am unable to connect to any of the ...
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3 answers
245 views

Why can I not login to my raspberry pi 4b?

I am attempting to log in to my raspberry pi 4b for the first time. I have the wifi file all sorted out and I have a blank file called ssh. I have done ping raspberrypi.local and its shows up and ...
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Connecting Several Pis over Network

I am running an Intro to Robotics class, and I am having them create different projects to use in my classroom with pi zero 2ws. For example: a countdown clock using LED lights. I want to be able to ...
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Is it normal my wired internet connection is capped?

I'm experimenting quite a surprising slow internet connection on the Pi. I scrolled a lot through the web and I'm unable to figure out whether it's supposed to be that way or not: some people seem to ...
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RPi 4 won't connect to wifi extender

I have a RPi 4 which i am wanting to setup wirelessly - this works fine on my home WiFi. But because I am very far away from my router (other side of house) it is incredibly slow. I do have a WiFi ...
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Can 2 different wires be connected to the same GPIO pin?

I am trying to make a voice assistant with the Raspberry Pi and ReSpeaker 4-mic array. ReSpeaker 4-mic array requires 40 pins to be connected to Raspberry Pi. But besides that, I want to connect the ...
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Errno 121 Remote I/O error happening too often on Raspberry Pi 4 [closed]

I'm using a Raspberry Pi 4 - Rev1.4 together with a tc9548 multiplexer and 2 additional I2C sensors behind each multiplexer channel. OS version: AME="Raspbian GNU/Linux" VERSION_ID="11&...
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2 answers
166 views

SSH into Raspberry Pi connected to Linux Laptop via Ethernet cable

How do I SSH into my Rasperry Pi which is directly connected to my Linux Laptop via an Ethernet cable? As far as my research went, it does not get assigned an IP, which is the reason why I can not ...
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Issue with Raspberry Pi and VNC Viewer

I am using Raspberry PI 3 and trying to connect it with my laptop using VNC viewer, my Raspberry PI is not able to connect with VNC viewer since last 2 to 3 days after I changed the network which it ...
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Connection to WiFi when it shows up - DHCP timeout?

We switch off WiFi an a raspberry over night. In the morning both is switched on together. Unfortunately the pi starts faster than the access point and therefore the pi could not connect to a wifi. ...
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Unable to connect Raspberry to Wifi

I want to connect my Raspberry to Internet through Wifi, but it can't detect any Wifi. I've read that only Pi 3 and + models can do that, but mine is a Raspberry Pi 3 Model B Plus Rev (see picture). ...
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Raspberry Pi | Data Communication | Process Data

I need to receive electricity data from a charge controller with a raspberry pi and process these data on the hmi screen. How can I get accurate information about raspberry pi data communication, how ...
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How would I be able to connect a Raspberry Pi CM4 to another PCB that has extra IO?

How would I be able to connect a Raspberry Pi CM4 to another PCB that has extra IO? I would be thinking some sort of ribbon cable but I am also interested in how the Pi top connects its two PCBs.
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Bespoke Power Supply cable issue

I am trying to create an in-car (headrest) entertainment system using the Pi 3B with 7" screen using OSMC, when OSMC is shutdown it does not fully power off the screen, I can detect the shutdown ...
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Detecting connection between two arbitrary GPIO pins on Pico [closed]

I wrote a code that I run in Thonny which detects if a connection is made between the 3.3V output and a GPIO pin on the Raspberry Pico: print("Hello World!") import time import digitalio ...
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Access point works with cell and tablets but not other computers nor other raspberry pi

I have two weird situations. I configured my pi4-4gb to be an access point for a private network. The goal is to allow multiple pi-zero-w to connect to this access point and also allow, when connected ...
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Error Connecting Raspberry 4 model B to Windows 10 Directly with ethernet cable

I received my Raspberry Pi 4 Model B yesterday installed latest Raspberry OS on MicroSD and have been trying to connect it to Windows 10 directly with a Ethernet cable "no hub or router" and ...
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Trouble setting up SSH "Connection Timed out" on Headless RPI 4

I've decided to enter into the world of HomeLabs with the acquisition of an RPI 4. I went throught the procedure of setting up the RPI and everything worked correctly. I've used both a(n) dynamic/...
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1 answer
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How to use a Raspberry pi as a WiFi-to-Ethernet converter?

this is my first question on this site. My problem is that i have an old PC lying around with no WiFi adapter but it has an Ethernet adapter. I want to connect my Raspberry pi to WiFi then connect it ...
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2 answers
867 views

(Another) Cannot SSH to Raspberry Pi from Mac -- Port 22: Connection Refused

So, as the title states, I cannot SSH to a Raspberry Pi from my Mac. I have done so in the past, but can't figure out why it won't work now. Unless stated otherwise, all devices I mention below are ...
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Folding at home stuck on "Connecting"

Information Hello. I'm having some issues with the Folding@Home Client for raspberry pi. I am using a raspberry pi 4 with the 64bit version of Raspberrypi OS (Found here: https://downloads.raspberrypi....
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connection to port 22 refused before asking for username/pword

I've added an empty ssh file to the /boot directory. When I run ssh pi@raspberrypi.local, I get this error: ssh: connect to host raspberrypi.local port 22: Connection refused without being asked for ...
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Can I use this screen from a digital brochure with the Pi?

I recently received a kind of digital brochure that was just this large screen in a cardboard envelope. I ripped it out and I'm curious - can I drive this with a Pi? I tried looking for ribbon cable ...
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SSL certificate for multiple dock containers running on RPI 4

Hi guys I have a question regarding docker containers and ssl certificates. I want to install more than one docker containers like pi hole , Bitwarden and motioneye . To access them I have to type ...
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1 answer
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How can Rpi connect to and read the DIY PH-4502C pH Sensor?

How can Rpi connect to and read the DIY PH-4502C pH Sensor?
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SSH - Can't connect from LAN after switching to another network

A couple of days ago I bought a new raspberry pi 4, for now, I don't have desktop support but I set it up in headless mode (installed raspbian on sd card). I was able to connect it using ssh when it ...
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1 answer
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Only 8 devices can connect to my pi 4 [closed]

I conducted tests today with a Rpi4 4Gb RAM as a wireless access point and I wasn't able to connect more than 8 devices. But then I want to be able to connect at least 20 devices. Pls, help.
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Raspberry Pi 3b+ loses WIFI connection after 10 minutes

My Raspberry Pi 3b+ loses WIFI connection after 10 minutes, after it loses connection, I cant re-connect because there are no WIFI networks in the dropdown list. My only option was to completely ...
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Pi 3A+ keeps loosing connection randomly

I'm trying to set my rPi 3A+ as a local server running a docker container that is constantly logging info from a service. (It's running Teslamate) I've been having trouble keeping it connected to my ...
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-1 votes
1 answer
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What's the best way to remote control a Raspberry pi - powered robot? [closed]

I'm going to build a robot powerd by raspberry pi and i wnat to control it remotely, the principal tasks that need to have a remote exchande of data is: the streaming of 3 cameras the monitoring of ...
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2 votes
1 answer
111 views

Can a Raspberry Pi boot a small OS/application off of a floppy disk?

Is it possible to develop a small OS/script for the Raspberry Pi that can boot from a floppy disk? If so what knowledge and tools would be needed to accomplish this? i.e. No sd card, just a floppy ...
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156 views

Failed to get D-Bus connection: Unknown error -1

Well I ran into a major network failure when I try to get two PIs talking to each other directly through their Ethernet ports. They use to connect to each other and communicate, but for some odd ...
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RealVNC Connection Problem

I have a question regarding RealVNC and the Raspberry Pi 3B. I can't connect to the Raspberry pi and I get following error message: "Timeout while waiting for a response from the computer". ...
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1 answer
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What power supply can I use for 2 servos?

I am a complete noob when it comes to raspberry. I have 2 servos MG996R that I need to power from an external power supply. Currently I am doing it from the board, and when I turn both of them the ...
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Connecting 2 Raspberry Pi's for Extra GPIO ports

For the project I am working on, i will need more GPIO pins than the Raspberry 4B provides. I'm looking into combining 2 Raspberry 4B's together to get extra GPIO pins. I also looked into port ...
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SSH to multiple Raspberry PI 4B

I have 2 PI that are connected to my local network first PI has the IP: 192.168.1.48 and the second one 192.168.1.49 that I can SSH to them in my local network without a problem, however I opened a ...
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Raspberry Pi Water Level Sensor doesn't work

I got a question. I'm trying to make a water level sensor to check the water level with Raspberry Pi and a water level sensor using this tutorial. https://kookye.com/2017/06/01/design-a-water-level-...
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-1 votes
3 answers
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Which IP address should I useconnecting to rasperrypi?

While connecting to RasberryPi via ssh I was trying to connect and I had a couple of issues: Sometimes when I use 'hostname -I' to get the IP address I could see 2 IP addresses? Could you explain me ...
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get google-authenticator working in other network than configured

Recently I enabled 2FA on my RPi 4B using google-authenticator as in this tutorial: https://www.raspberrypi.org/blog/setting-up-two-factor-authentication-on-your-raspberry-pi/ It worked fine, however ...
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1 vote
2 answers
365 views

Micro JST 1.25 to any raspberry pi or RPI 4?

I'm Making a raspberry pi project, and I want to connect a Micro JST 1.25 to a raspberry pi. I already got a Micro JST 1.25 cable, but I need to connect it to a raspberry pi to operate it. I searched ...
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Can't connect to raspi using USB (RNDIS) after setting up systemd networking

I followed this guide to set up networking over systemd: Use systemd-networkd for general networking After rebooting I can't connect to my Raspi again using USB cable (with RNDIS). Also, I somehow ...
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1 answer
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Stronger Physical Connection to GPIO Pins

I looked a fair bit for a discussion on how people physically connect to the Raspberry Pi's GPIO pins, but could not find too many resources. I use my Pi's in vibration intensive, remote locations so ...
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HDD with separate power supply randomly unmounts

I have a very strange issue with external HDD (4TB) attached to my rpi 4. External drive has it's own chassis with power supply. I chose this chassis especially for my rpi project in order to prevent ...
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2 votes
3 answers
2k views

Couldn't ssh to my Raspberry Pi - "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!"

It's not the first time that I am trying to ssh to my Raspberry Pi... I just removed the SD card and installed a new OS on it, enabled SSH, changed password, and connected it to Wi-Fi. I checked that ...
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2 answers
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Send data to pc over bluetooth or wifi

I am working on a project where i have a motion sensor connected to a arduino connected to a raspberry pi and when the motion sensor detects movement i turn of my Windows pc. I want to connect the ...
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0 answers
23 views

My LAN cable connection doesn't work, when I have usb drive plugged

I bought new raspberry pi 4 with 8 GB ram, and it behaves strange- while it has connected external usb drive, which has it's separate power supply and I power up rpi, it doesn't connect to the local ...
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2 votes
1 answer
64 views

How to connect the raspberry pi to the internet with the internet from a pc (via an ethernet cable) [closed]

excuse me I want to ask. I am still a beginner in raspberry pi. I have internet connection problems on the raspberry pi. I can remote raspberry with PC using ethernet. and my pc is also connected to ...
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2 votes
0 answers
62 views

Strange DLP projector connection with RPI [duplicate]

I am using nanodlp with a DLP light projector (wintech PRO6500) and a raspberry 4. I have seen that the raspberry allows me to define /dev/ttyAMA0 referring to the projector. But /dev/ttyAMA0 already ...
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1 vote
2 answers
2k views

How do I make Barrier run on startup?

So every time I start up my raspberry pi I have to unplug my mouse from my main PC into my raspberry pi 4 and manually open up barrier so that I don't have to use 2 set of KB&M but I want to cut ...
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1 vote
2 answers
400 views

Can i connect using WiFi Direct to use smartphone as monitor. No internet access!

I would like to know how to connect my RPi 3 model B+ to my Samsung Galaxy s10e (sm-g970u) using WiFi Direct to use my smartphone as the display screen as i have NO internet access at my home and i ...
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