Questions tagged [pi-2]

This refers to the quad-core Raspberry Pi 2 (currently only available as a "B" model with Ethernet and four USB ports), with 1 gigabyte of RAM.

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Pi2 as an USB-Switch to share his eth-connection

I want to share my thoughts and questions about using a Raspberry Pi as an alternate Switch/Router or whatever. First my problem is, I have 3 stationary PCs, all of them are connected to a switch (eth)...
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RaspberryPi 2 can not be restarted (sdhost-bcm2835 timeouts, print_req_error)

I have a relatively simple setup: One Raspberry Pi 2 is directly connected to my home router, running Debian 10 and PiHole with an Unbound rDNS service. That's it. I have set this system up two times ...
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kiosk mode buster lite Pi Br2

I am trying to view my Octopi PiCam on a PiB2. I followed the guide here: https://die-antwort.eu/techblog/2017-12-setup-raspberry-pi-for-kiosk-mode/ Everything has went fine, no errors, no crashes. ...
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Printing Multiple pages pdf [closed]

I am using yocto in raspberry pi QT and using cups, but printing pdf of size greter than 2mb does not prints and stays in lpq for printing following is my code please help me as soon as possible. ...
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1answer
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Raspberry cannot install anything via sudo apt-get install <x> [closed]

yesterday i bought a new Raspberry Pi 4 Model B. Im trying to install java & other packages but when i try to install via command: sudo apt-get install <x> i get the error: i tried to with ...
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Error while Starting Raspbian

Enviroment: Device: Rasberry Pi 2 OS: Raspbian Last sign of life: 8.March 2021 Problem Since 8th of march I've got no message of my raspberry pi, so I get them and try to boot with a connected monitor....
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How do I debug these spontaneous crashes?

My headless Pi 2 (running stock raspbian) sometimes crashes out of the blue. It happened again today, and I had a monitor attached so I was able to get a photo of its final words. I just don't know ...
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1answer
42 views

Are the ARM Mailbox and Doorbell interrupts ever triggered?

I'm writing some very bare metal multi-tasking code that manipulates the hardware on a Pi3. Part of that is to initialise a frame buffer, and I'd like to avoid polling loops, where possible. (e.g. ...
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48 views

Energy consumption raspberry pi 2B

I would like to calculate the energy consumption of a given process in a Raspberry Pi 2B Rev.1.1 BCM2836. It is fed using the microusb port through a laptop docker via USB. I'm using atop to get the ...
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Pi 2B with docker loose connection after some time

I have a Raspberry Pi 2B, I installed first Raspberry OS lite and then Ubuntu Server. The behavior I will descript was the same in both systems. So, I wanted to use Docker to run a web server (1 ...
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81 views

Problem copying Micropython from Rpi2 to Pico

I am following this page for instructions: https://www.raspberrypi.org/documentation/pico/getting-started/ I see the pico added as a drive when I hold sel button, and apply power with the usb cable. ...
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Configuring Rasberry Pi 2b for WiFi adapter monitoring fails upon reboot

I've been using this guide to configure my Raspberry Pi model 2b and turn my WiFi usb adapter into monitor mode. To note I used this github repo to get my WiFi usb adapter working on my Raspberry Pi ...
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Prevent automatic connection to open wifi

I am using a Raspberry Pi 2 with a USB wifi adapter (headless setup). The wpa_supplicant.conf file contains authentication information only for my wifi access point, and the pi connects to it as ...
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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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Raspberry pi 2B is stuck on rainbow screen and the 7" official screen is white

My Raspberry pi 2B works perfectly fine when it is connected to my TV via HDMI. But when I connect it to the touchscreen at the same time, the touchscreen is just a white screen and on the HDMI, it is ...
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3answers
132 views

RPi fails to get DHCP-assigned IP address

tl;dr: After my local network addressing scheme changed from 192.168.1.X to 192.168.21.X, my RPi failed to adapt and was still accessible via 192.168.1.2. When I added iface eth0 inet dhcp as the last ...
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Fail to install alpine linux in sysmode

I have a raspberry pi 2B and I wanted to install alpine linux in sys mode. I use a 64gb microsd samsung evo plus. I followed the wiki of alpine here formatting like in troubleshot the boot partition ...
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PiHole Not Resolving Local DNS Entries for clients with static IPs

I have a Raspberry Pi 2 running Pi Hole 5.2.2 and Cisco Linksys E2000 router running DD-WRT v24-sp2 (08/12/10) std-usb-ftp I want to be able to have PiHole resolve a DNS entry such as MyDevice to an ...
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Python script not playing audio when run through systemd

After trying every possible solution online I am posting this question. I have a python script that runs on boot with the help of systemd. Everything worked fine till I installed a fresh raspian ...
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1answer
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voltage issues with GPIO raspberry pi 2

Need some assistance here. I am trying to setup some high voltage SSRs to my Raspi for an eventual lightshowpi project. Trying to start small first. I have a bunch of LEDs I have been playing around ...
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Raspberry Pi 2B External HDD not detected

I'm trying to connect my external hard drive to my Raspberry Pi 2B, but I am not able to get it to show up. I am running the latest Raspbian, and I have updated my software. Running lsblk --fs, I only ...
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318 views

firmware bug bootloader left irq enabled bank 1 irq 9 and boot fails

I updated the packages on my Raspberry Pi 2 (running Ubuntu Mate 20.04) by using apt update and apt dist-upgrade. Everything went smoothly. Then I restarted, and got the following error during the ...
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1answer
167 views

QEMU 5.1, rpi2b, (Arch) and ssh. SSH fails

EDIT: I significantly updated this after applying @Nikita Kipriyanov's answer. As of version 5.1 or 5.01 QEMU now supports RPI2 & 3 and USB. As the network on the RPI is behind USB, I should now ...
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RPi 2B slower internet speed via ethernet connection

I have a RPi2 B and been noticing I am not getting the full internet speed via the ethernet connection. My setup: 1TB HDD via USB 16gb Sandisk MicroSD RPi2 B connected directly to modem Plex, RClone, ...
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2answers
33 views

Best way to detect a small portable device in the range of 5-6 meters [closed]

I have a couple of things automated in my room (fan, lights etc) using a server running on Rapsberry Pi 2 and relays. Now I would like to implement a system to automatically detect when I am in the ...
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Raspi 2 v1.1 freezes randomly

I set up my old Raspi2 v1.1 a few days ago, but its behaving strange. It freezes / hangs up after some time. Things I've tried so far: Swapped out my sdcard for a different one Copied the os to an ...
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Raspberry PI and 8 module relay board

I have a raspberry pi 2 and an 8 module relay board (http://nettop.gr/index.php/en/hlektronika/relay/8-channel-5v-relay-module-with-light-coupling-5v.html). Between the relay board and the raspberry I ...
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VPN working? or not? How do I know?

I have what appears to be a working VPN on my Pi2 with Raspbian which I can access from an Android mobile phone and a Nexus 7 using PureVPN What I cannot determine is whether it is actually working ...
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1answer
35 views

Why here capacitors of 0.1uf and 100uf are used?

What is the use of these two capacitors here. The circuit is working just fine without them also.
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Yocto linux on rpi 3b+, bootup issue. mmc1 is not getting hardware interrupt

I tried to bootup rpi 3b+ with yocto-linux(kernel v4.19)(console image) but its not booting up. I suspect its something related to i2c or interrupt. Note : I have taken care of device tree and overlay....
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DHT 11 sensor not found, check wiring

I am using raspberry pi 4 model b and sensor DHT 11 for checking the humidity and temperature. When I am using the code DHT.py, the result is: 1604263139.922 4 3 0.0 0.0 1604263142.192 4 3 0.0 0.0 ...
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1answer
55 views

Using pi as router

What is the minimal config needed, to be able to specify some static route for network subset (eg 10.199.0.0/16), so that my raspberry redirects to internal PC? LAPTOP (pink) is connecting via VPN to ...
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Is there an Arch derivative for Raspberry Pi 2 that has desktop environment preinstalled?

I have a Raspberry Pi 2B, and want to install an Arch based distro on it. Is there a derivative of Arch that supports Pi 2B and also comes with desktop environment preinstalled? Arch Linux Arm ...
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How to install Lantern Pro for Raspberry Pi 4b? [duplicate]

I have a lantern pro account, I want to install and use it for my Raspberry Pi 4B How to install Lantern Pro for Raspberry Pi 4b?
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1answer
106 views

Installing OpenCV fails for missing header files

I am trying to install opencv 3.0.0 on my raspberry pi 2b but I keep running into erros... currently, it complains about the following missing header files when I run the following cmake command: ...
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143 views

Cannot change display resolution from 640x480

I have a Raspberry Pi 2 Model B. which I use to auomate a couple of things in the house. I connected a relatively old Full HD display which has VGA input, by using a HDMI to VGA adaptor. The display ...
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3answers
45 views

power supply specification

are there any public requirements (which I have not found) specifing power supply ramps / gradients e.g. is there a spec like from 0 to 5V in 5ms or faster also when turning of, is there any ...
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250 views

Installing php7.4 + MySql on Stretch with nginx

I want OwnCloud and I am trying to install PHP 7.4 on Raspbian GNU/Linux 9 (stretch) following @janw's tutorial but facing some errors: E: Unable to locate package php7.4-… then I was able to solve ...
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2answers
99 views

Access 192.168.2.x from 192.168.0.x

My Rpi-2 is connected to my home router which assigns an IP address 192.168.0.x to all its clients. I have created a network bridge on this rpi so that it shares the main routers connection with the ...
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1answer
186 views

RPi will not boot to command line [closed]

My RPi 2 (jessie) still boots to desktop, if I configure CLI in raspi-config. I also tried what was recommended here: sudo systemctl set-default multi-user.target sudo ln -fs /lib/systemd/system/getty@...
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3answers
582 views

MySql backup database every night

I have service and MySql database on my Raspberry Pi 2B. Yesterday, my SD card in my phone died. I started thinking about database backup on my Raspberry Pi. Anybody have any experience with this? I ...
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45 views

Load cell changing over time

I'm using a 1kg load cell beam (see example at bottom) connected to a HX711 board then connected to the Raspberry GPIO. I'm running this Python3 code: https://github.com/gandalf15/HX711/blob/master/...
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40 views

I see two Octopi instances on my Raspberry Pi - why, and how can I stop this?

I installed Octopi on a brand new R Pi straight out of the box, connected it to my Wireless network and to my Ender3D and all went well for a few days, until I started having odd symptoms, such as ...
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1answer
44 views

Update file to text file on webpage [closed]

(If this is the wrong stack please let me know) Consider the following: I have a nodejs file called stbot.js. This file I code on my laptop and transfer to my pi via github. However it kinda annoying ...
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1answer
45 views

How to connect raspberry pi to cellphone tower and communicate with it by Android phone [closed]

I need to communicate to my raspberry pi with my android phone via cellphone tower. For example,a raspberry pi is connected to nearest base station, if i enter into that base station's range i want to ...
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13 views

Audio output is changing after I exit the ssh session

My RPi2 has both HDMI and jack output audios. I would like to use always only the jack output. If I connect via SSH to the pi and select the output in alsamixer (using F6), I can activate the audio ...
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3answers
157 views

Cannot reach Internet after assigning fixed IP address in dhcpcd.conf

Hardware: Pi 2 OS: Raspberry Pi OS 32-bit No firewall. Running over ethernet (no WiFi card) I am following a tutorial to set up a Pi as a file server for home. For this, I need to install Samba. ...
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1answer
38 views

JAVA development environment for Raspberry Pi 2 or perhaps from the command line?

Hi I'm new to Raspberry (Pi 2) and would like to know (1) if it's feasible to develop simple JAVA apps in a development environment (Eclipse? Others?) or failing that from the command line. (2) a ...
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2answers
107 views

Change the read-only to write [closed]

I don't know why suddenly the following message has started to appear. -bash: cannot create temp file for here-document: Read-only file system I can't write files, only read, can't use tab to end ...
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1answer
40 views

playing music from stream [closed]

I have a raspberry pi 2 model B and a raspberry pi 1 (I think, it doesn't have any version number on it and I have had it for a long time and I don't quite remember exactly the version). I think the ...

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