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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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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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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110 views

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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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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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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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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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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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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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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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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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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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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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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38 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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30 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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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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107 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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28 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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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
25 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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1answer
44 views

Installing fresh image of operating system on Raspberry Pi 2

I have an older Raspberry Pi 2 that I'd like to put the latest compatible OS on. The specs of my Raspberry Pi: Raspberry Pi 2 Model B 1 GB from Canakit.com It came with a 8 GB SD card. I bought it ...
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41 views

Raspberry Piv2 Camera NoIR displays pink colors in video feed!

I want to ask that I have a piv2 NoIR camera that gives pink colors in a camera stream running live on my Jetson Nano, So I want my piv2 camera to display normal colors then what can I do? Do i need ...
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1answer
39 views

Raspberry Pi 2B missing RAM

weird thing here. I noticed my Pi model 2B is reporting a smaller amount of available RAM than before (~700Mb vs 1Gb). [root@raspberry ~]# free -m total used free ...
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65 views

Raspberry Pi & Motor Control [closed]

I am looking to use raspberry pi to control a motor that has multiple speeds but want all speed and timing to be controlled on the pi. Would the proper setup be a breadboard with a servo motor ...
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179 views

Using PWM with RPi.GPIO in Python

Scenario: I want to control a PC fan using the Raspberry Pi. The 4-wire-fan (MGT9212UR-W25) has its own power supply (12V) and can be controled via PWM. I would like to control it with a Python script ...
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28 views

Unable to upgrade my model 2B Pi running Jessie

I am trying to update all of the software on my model b pi. I have cleared as much space as possible - then did df -h Filesystem Size Used Avail Use% Mounted on /dev/root 6.0G 5.2G 450M ...
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1answer
44 views

Can Rpi GPIO pins be used to drive a DC motor? [closed]

I tried to GPIO pin to high and I cannot see output voltage. I try every solution but no one works for me. import RPi.GPIO as g g.setmode(g.BOARD) g.setup(16, g.OUT) g.output(16, g.HIGH) I look GPIO ...
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1answer
64 views

Reconfigure pi GPIO default states

The default states (right on boot), on my pi are: +-----+-----+---------+------+---+---Pi 2---+---+------+---------+-----+-----+ | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi ...
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221 views

How to turn off relay when RPi shuts down

I have connected a relay to BCM 14 and by setting its output to HIGH I can turn it on, making a 220V bulb to turn on. I use for that the following python instructions: GPIO.setmode(GPIO.BCM) GPIO....
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18 views

RPI2 with two WiFis works ok for single requests, browsing is impossible

I want like to create a simple WiFi booster with Raspberry PI. So I have RPI2 with two dongles: Ralink (rt2800usb) and Edimax (rtl8812au). pi@raspberrypi:~ $ lsusb Bus 001 Device 005: ID 148f:5370 ...
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59 views

Problem I2C when using BH1750 photoresistor

(Raspberry Pi 2, model B, V1.1 - buster OS - all updated / upgraded - smbus loaded on) Hi, I am quite new to the Raspberry Pi and recently I have hit a brick wall. I am trying to link the Raspberry ...
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3answers
62 views

connect multiple temperature sensors to rpi

I need to connect multiple temperature sensors to my RPI. can you, please, elaborate whether/how can this be done with this or this unit? or can you suggest other unit? I need to measure temp on the ...
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292 views

Can I upgrade my Python version with miniconda on Stretch or do I need to upgrade OS?

Need some advice here. I have an old RPI 2B with ARMv7 Processor rev 5 (v7l) running Raspbian GNU/Linux 9 (stretch). At the moment it's got python 3.4.3 and a lot of other packages installed with ...
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1answer
30 views

Raspbian Crashing on RPi2 | full screen goes to one (somewhat random) color when web browser loads heavy page

I've had this strange problem with my Raspberry Pi 2 for a long time now. I have it set up as a sort of third monitor for my main computer. I've installed Synergy and Redshift, then set the screen to ...
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19 views

lxde with debian 8 on pi-2

On the old wheezy OS, lxde was provided for the desk top. When you were looking through folders, you had a choice of how to view the files in the folder. (list,small icon,large icon,thumbnails, etc.). ...
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RPi 3B (not +) image on RPI 2

I have OctoPrint running on my Pi 3 Ok withou any issues. Should I be able to boot the same image on a Pi 2? David
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145 views

Getting a NRF24L01 module running with Java

I'm currently trying to make a NRF24L01 module work by using Java. I found this library that makes use of the JNI, but I can't get it to work. When I try to run the provided example code the ...
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32 views

Connecting 3 ultrasonic sr04 sensors, 4 infrared avoidance module to picon zero mounted on raspberry pi 4

Im begginer to raspberry pi, can you help me please? Im trying to connect 3 ultrasonic sensors + 4 infrared avoidance module to picon zero mounted on raspberry pi 4. Currently I have picon zero ...
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42 views

OMV on RaspberryPi 4 or Pi 2B+

Am new with raspberry pi and i try to make a nas with my pi using omv, i have both pi4 and p2b+. This are the step that i follow: Format SD Card with SD Card Formatter Download Raspbian Buster Lite ...
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1answer
560 views

How to Install TP-Link TL-WN823N V2 on Rasperry Pi 2?

I've got a Raspberry Pi 2 I'm trying to install a TP-Link TL-WN823N V2 onto. pi@raspberrypi:~ $ iwconfig eth0 no wireless extensions. lo no wireless extensions. pi@raspberrypi:~ $ ...
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1answer
47 views

Creating a network extender

Today I was hoping to setup a network extender. I want it to connect to my router via ethernet, and then share out that connection via WiFi, and stay on the same network. All of the tutorials I looked ...
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1answer
43 views

RFID and LED Script disables RFID reader until reboot

I have two simple scripts, which work individually. One simply lights an LED, the other reads RFID. Now I want to put them together, but seem to fail. Once this runs, I can't read RFID anymore until ...
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35 views

Can powering a DC motor through the USB ports of my Raspberry Pi Damage the Pi?

I'm working on a project that contains two DC motors and a Raspberry Pi, I do not have other components like Relay, Motor Drivers, transistors etc. I am aware that powering a motor directly from an ...
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1answer
91 views

Minecraft server not working

I want to run a Minecraft server from a Raspberry Pi 2. I already tried the 1.8.9 and the 1.15.2 versions. Both of them started, as expected. On my computer I tried to connect, but after a while, it ...
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2answers
294 views

is there an equivalent to the dkms tool in raspbian buster?

I am installing a wifi dongle on an RP2B and the only instructions I can find were for Linux Mint using: sudo dkms add ./rtl8188fu I get a command not found. How is this done in Raspian?

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