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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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How to Type Unicode Characters

I want to show if a code is locked or unlocked and a fun way I thought of would be to use a unicode character. How would I type Unicode characters such as “🔒” (U+1F512), or is that beyond the pi's ...
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3answers
2k views

How to generate accurate PWM signals

I've ran into a bit of an issue with the Raspberry Pi's ability to generate accurate PWM signals for servos. My problem with this is that the servos jitter because of this lack of accuracy. Is there ...
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24 views

Raspberry Pi 2b won't produce HDMI output, both LED's on

I have a Rasberry Pi 2b running raspian. It was previously working, however whenever I try to turn it on both LEDs come on prmenantly but nothing is outputted on HDMI. My TV does change from saying ...
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1answer
194 views

Raspberry PIs for NOC displays [closed]

We want to serve NOC information on 3 displays in our office, and are considering using Raspberry PIs for that (3x http://www.amazon.de/Raspberry-Modell-Quad-Starter-Bundle/dp/B00T7OHE9A/). Our NOC ...
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1answer
87 views

Speed up SPI transfer

So I need to transfer a byte on the spi interface on raspberry pi. Here's my code in python import spidev import time import binimp fhandle=open("white.txt") initial=binimp.extract(fhandle,'192','...
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bridge repeater unsure what to call it

ok here is the set up router 1 ~~ pi ~~ router 2 ~~~ rest of the home router 1= public wifi (aka library) i need the rpi to pick the signal up using a [Alfa Long-Range Dual-Band AC1200 Wireless ...
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1answer
549 views

Unable to ping Google.com from raspberry pi 2 , also error during sudo apt-get update

I have Pi 2 installed with raspberries OS All the setting as default and its connected to WiFI, signal strength looks good. Here its : However, I'm unable to ping Google. I have referred this ( ...
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2answers
104 views

Headless Connection to Raspberry Pi [duplicate]

I have tried to create a headless connection to my (new) Raspberry Pi, since I do not have a HDMI cable at home. However- after trying everthing I have found as suggestions on Google etc.- I just ...
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1answer
31 views

I'm trying to make a shell script that can mount a exFAT drive

Hi I am trying to make a shell script that can create a directory (/mnt/drive) and mount a exFAT drive in that directory on my raspberry pi 2. The problem I am having is that when I try to run the ...
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1answer
73 views

At what instances do we use the Board mode and BCN mode in Raspberry Pi?

I know about the two modes of working in Pi using python, Board and BCN. However, I am really confused as to the instances or situations where I should use them. An example demonstrating their use ...
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1answer
83 views

Serial read from arduino not working properly

I am trying to read analog read from ardunio connected to my raspberry pi. Following are my raspberry pi and arduino codes. Raspbery pi: import time import serial ser = serial.Serial('/dev/ttyACM0'...
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1answer
24 views

Connecting a Compaq CQ56 screen to a raspberry Pi

I've got this laptop in pieces, a Compaq CQ56. I want to take the screen and connect it to a raspberry Pi to make a interactive mirror like so many tutorials show. On the back of the screen it has ...
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1answer
41 views

Raspberry pi 2 model b+ odd booting issue

I ran into an odd issue with my raspberry pi and was hoping someone could help me point in a right direction here. I have a model b raspberry pi successfully running latest raspbian (downloaded from ...
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18 views

Use Raspberry Pi 4B as wifi access point and wifi client at same time to function as an extender/repeater [duplicate]

Looked at older threads and found that none of them were working properly and was hoping for an updated tutorial. My main issue is that my Model 3 won't connect to a certain wifi network, and was ...
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1answer
57 views

Can't connect via SSH to RPi2

I have searched for old topics but I can't find anything that could solve my issue. I have installed Ubuntu MATE on SD card and created the ssh file on the boot\ directory. I connect the RPi2 ...
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1answer
82 views

Can't connect PI through wifi but ethernet routing is working

I want to access my RPI using SSH, so connected my PI to wifi router via ethernet and i'm trying to access this via Laptop connected through wifi on the same router. When I search for IP using ...
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1answer
23 views

Raspbian 4.13 on Pi2 - Mouse issues

Had model 2. just loaded the latest Raspbian 4.13. attached a wireless HP mouse. it is gliding on the screen, slow and behaving like it is drugged. this mouse works fine on other machines. This is ...
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2answers
52 views

macos x installion rapsberry pi

Hi I just installed my Pi according to this tutorial https://www.youtube.com/watch?v=4Fe1C1D5DhU but I got just one MacBook so as I put the SD card back, it shows this error The disk you inserted ...
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1answer
57 views

Raspberry pi + L298 H bridge motor speed reduced when battery circuit shows 50%

I made a raspberry pi car. The pi is powered by two 18650 (Breewell New Multipurpose Flat Top 18650 Battery 2000 mAh 3.7 Volt Lithium Genuine Rechargeable Battery -Pack of 2 https://www.amazon.in/dp/...
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1answer
41 views

Wireless USB Adapter not working on Raspberry Pi 2

I am trying to install a Wireless USB Adapter but Raspbian can't detect it. tp-link TL-WN725N | Raspbian 10.1 | Raspberry Pi 2 Model B I think the drivers were installed correctly, but I just ...
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1answer
45 views

Permanent & Safe Powering of Raspberry Pi in Confined Space

I have a small project that involves the automation of the lights in a room using a Raspberry Pi and a set of four relays. All of the software and hardware is operational, and it is ready to be ...
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1answer
196 views

Error when installing Periscope

I've created a media system with my Pi 2, but when I install Periscope using sudo pip install periscope, I obtain this error:: Requirement already satisfied (use --upgrade to upgrade): periscope in /...
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1answer
32 views

OnionPi - No internet connection after adding Iptables rules

I need some help or advices since I've not know what could I do to fix this issue. I've built an onion pi following the adafruit tutorial. This basicly is a wifi hotspot that routes all traffic ...
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1answer
35 views

GPIO.input(24) is coming back True when it shouldn't be (false button presses)

I have a button in a working circuit. Within sys/class/gpio/gpio24, value changes properly (it becomes 1 when pressed down, 0 otherwise). When I use GPIO.setup(24, GPIO.IN) within python, GPIO.input(...
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1answer
77 views

Raspberry pi 2 model b system clock ppm

I have a Raspberry Pi 2 model B and a RTC (precision 1 ppm) hooked up with, without Internet conneciton. When the RPi is power off is the RTC the responsible to keep the current hour but when the RPi ...
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1answer
68 views

Can I use a Sanyo tv as raspberry pi display?

So I have a decently old Sanyo tv laying around, and I want to put it to some use. I intend on using it as a display for my raspberry pi. All in all I was just wondering whether such a task is ...
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1answer
62 views

why does my raspberrypi 3B not able to reboot each time power is shut down?

I installed raspberian in my raspberrypi. It worked for the first time. But when I shut it down, it didn't reboot again. So, I had to format the sdcard and reinstall the raspberian again. And ...
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1answer
73 views

Raspberry Pi + NRF24L01 timeout after a period of time

I am using a Raspberry Pi 2 with a NRF24L01 module... to communicate with several Arduinos. It is working very well ... until some point... after days or weeks. Then I get only timeouts. Not even a ...
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1answer
896 views

Thermal printer with Raspberry Pi 2 outputs only Chinese chars

Following thermal printer + raspi2 tutorial for printing images (https://learn.adafruit.com/networked-thermal-printer-using-cups-and-raspberry-pi/connect-and-configure-printer), I've already connected ...
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2answers
63 views

Pi 2 won't boot to HDMI

I had just setup VNC Viewer successfully for once. I shutdown my pi 2 then reconnected the pi camera cable that had fallen out. Now the HDMI is not working. I tried the same cable on 3 screens then a ...
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2answers
82 views

High frequency hiss when running on Pi2

I have a Raspberry Pi 2 running Open Source Media Center (aka OSMC), and when it runs, I hear a very high frequency hissing noise coming from the Pi. In my family, I am the only one able to hear this ...
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1answer
91 views

RPi as a Dolby Amp?

I have bought a new Smart TV but the sound is a bit disappointing. So I was wonder if using an RPi with some sort of on board amplifier would work; either normal sound to a speaker and Dolby. Is this ...
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2answers
112 views

Pi-Hole: How to change DNS via command

I use Pi-Hole on my Raspberry Pi 2. It's very easy to change the Pi-Hole DNS using the Web Interface Settings. But how can I change my Pi-Hole DNS via command in my raspberry pi console? (Raspbian) ...
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0answers
11k views

How Can I Emulate An x86 CPU on a Raspberry Pi with Qemu?

!!DISCLAIMER!! I am aware that this question has been asked before HERE, but after having followed that question step by step, troubleshooted on my own and having done plenty of research on the ...
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2answers
63 views

how to identify if ultrasonic pin is removed from circuit using python code

this is the simple code to measure distance using ultrasoinic sensor attached to reapberry-pi and by writing python script-- import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) TRIG = 16 ...
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1answer
70 views

What is the meaning of this errors?

I downloaded the driver for LCD touch display (KeDei 3.5 inch SPI TFTLCD version 3.0 20015/12/1) from http://kedei.net/raspberry/v6_1/LCD_show_v6_1_3.tar.gz. Afterward I unpacked it tar -xzvf ...
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0answers
56 views

cannot update after adding new source

I am running a raspberry Pi 2B (with GUI disabled) and I added deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi to my sources.list. After this, I ran sudo apt-get update ...
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1answer
27 views

Remotely Connect to Pi through VNC Outside of LAN Network

I want to be able to remotely access the desktop of my Raspberry Pi 2, running Rasbian Full, from outside of my LAN network. I've been able to easily connect on my network, but I want to be able to ...
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1answer
122 views

Raspberry PI + OpenNI2 + OpenCV

I have opencv installed on RPi. Now I need to install OpenNi2 and I have this error: "error: array subscript is below array bound" I use: PLATFORM=Arm make gcc -v 6.3.0 How to solve the problem ...
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4answers
269 views

Raspberry Pi; blank desktop

I have two raspberry pi 2 boards. I have wrote raspbian wheezy image on 8GB card using win32DiskImager. But whenever I run my board, nothing appear on the desktop connected (hdmi to VGA converter used)...
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1answer
104 views

RaspberryPi 2 GPIO stopped working

I have RaspberryPI with Arch Linux and everything was going well, until this morning when I tried to do my usual work on it, it sounds like nothing happening at all, I have checked with pintest (I use ...
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1answer
37 views

Sites unavailable ('Network unreachable') but pings work fine [closed]

I have a Raspberry Pi 2 Model B running Raspbian Buster (upgraded from Stretch). I don't use it very often, but recently I noticed that I can't do apt update because all the repos are unreachable (...
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1answer
93 views

Can I interface with a BeagleBone Cape from a Raspberry Pi

More specifically, the SparkFun CryptoCape < https://www.sparkfun.com/products/12773 > I'm assuming you can just pop the Cape into a breadboard and work away?
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3answers
541 views

Difficulties Miracast iPhone -> Raspberry Pi -> HDMI -> TV

What I want to do? Cast using the miracast icon from my iPhone to RPI which is connected with HDMI to TV. OR Mirror Screen to do the same thing. Problems I have encountered: RaspberryCast 3.0 (...
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3answers
60 views

wrong date after power supply interuption ( Sun 28thDec 2014)

The System rebooted after the power supply went off and now it has the wrong date and I cannot use the add ons . can someone walk me the through the solution as I am a dummy
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1answer
312 views

Can I modify an RPi2 image to boot on an RPi3 B+?

I have a Raspberry Pi 3 B+, and none of the operating systems that usually work on the RPi 3 will boot. I've done a small bit of research, and I think this has something to do with an outdated ...
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0answers
39 views

Can't Install Raspbian Because SD Card Shrunk

I have an 8 GB Kingston SD card that I'm using. I formatted the card with the formatter from sdcard.org and it kept its file size after format. I downloaded the NOOBS 3.2.1 file from RaspberryPi's ...
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1answer
32 views

How to stream music from pi to computer through browser interface?

I have a Raspi with connected USB drive that contains my mp3 collection. It is currently set up as a NAS using Samba. Is there a package that allows me to stream the music from the RasPi to my ...
0
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1answer
33 views

Possible to stream live-video with (almost) zero-lag using RPi 2B accessible via browser?

I'm an apprentice for becoming an IT specialist. My colleagues and me are trying to set up a Raspberry Pi in order to stream live video in 720p with (near to) zero-lag which has to be accessible via ...
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1answer
32 views

DHCP configuration in systemd

Currently, I have configured access point using hostapd and using systemd for configure the network ap0 (access point device). the access point configured automatically to use DHCP server. my ...