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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writing into fifo file and reading it

1.Transmitter side code: A)Recording audio into fifo file(no need to create fifo file separately arecord command will create fifo file): import os os.system('arecord -D plughw:1,0 -d 0 --rate=19200 ...
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Desktop Streaming Error(Raspberry pi Live Desktop & Audio Streaming to the browser with WebRTC)

I wanted to load the xscreen driver. so I opened a terminal and typed the following commands: $uv4l --driver xscreen --auto-video_nr --display :0 --framerate 10 --server-option '--port=5678' This is ...
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1k views

How does one setup and run tightvncserver on Raspberry PI?

I am very new to tightvncserver on Raspberry PI. So, I researched online and I am still confused. First, I came across this webpage How to setup tightvncserver on Raspberry PI website about ...
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How to emulate the u-boot with raspi2 on QEMU

By referred https://www.raspberrypi.org/documentation/configuration/boot_folder.md and What is the boot sequence? I am trying to run u-boot by emulating Raspberry pi 2 on QEMU. I followed https://...
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2answers
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raspi-config network option not working

I am trying to turn on the network option in raspi-config, but when I do, I get this error: could not communicate with wpa_supplicant Then I hit enter to continue and I get this message There was ...
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1answer
267 views

GPIO stop working nodejs Raspberry Pi, Gpio no longer enable

2 months ago, I configured my raspberry to use GPIO. I don't remember exactly what I did, but I do remember needing to configure something to enable GPIO. It worked great. 2 months later and multiple ...
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1answer
33 views

Troubleshooting my project xorg error. Services not booting

My /etc/X11/xorg.conf is empty i did have a 99-calibration.conf I put in /etc/X11/xorg.conf.d/ but I had to make the xorg.conf.d/ dir so i migth have already messed up before. Now starting the pi ...
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12 views

ALSA lib bluealsa-pcm.c:219:(io_thread) PCM FIFO write error: Broken pipe aplay: pcm_write:2053: write error: No such device

Bluetooth Error Device: Rpi 2 2014 Model B Ver 1.1 also Rpi 3 Bluetooth Headset JBL Everest Elite 750NC Bluetooth Adapter Panda Wireless PBU20 command line: aplay -D bluealsa:DEV=C8:DF:84:20:...
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0answers
41 views

Can a project work in one pi and not in another(both working pi's) [closed]

I have two Raspberry Pi 2's and a project on an SD Card that was in one of the Pis until I wanted to change it out (aka green and red light on, white screen on my LCD display), but starting the Pi ...
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2answers
449 views

Is the 3.5mm audio jack tied to a GPIO pin?

I have a Raspberry Pi 2 B+ and I would like to confirm that the 3.5mm jack isn't tied to a GPIO pin. I could not find any information on this and thought this may be the case but I wanted to double ...
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1answer
261 views

Cannot fatload Kernel image files in U-Boot?

Good day folks, I am here with a problem that has so far stumped me completely. When I use U-Boot to load files into memory from my SD Card, it works completely fine when I fatload my device tree ...
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1answer
562 views

Send Data from a Raspberry Pi to a Webservice with a Python Script?

I have a Webservice wich is reachable over a URL and I have a Raspberry with different sensors wich measures the temperature and co2.Now I want to write a Python script to send this values to the ...
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1answer
305 views

wpa_gui - X11 connection rejected because of wrong authentication

I am trying to use wpa_gui on my Pi2 from a windows machine using ssh inside MobaXTerm. When I do ssh -X pi@ I get X11 connection rejected because of wrong authentication. wpa_gui: cannot ...
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1answer
225 views

Why is bme/bmp280 temperature and humidity sensor returning 0 value?

I'm having problems with bme/bmp280 temperature and humidity sensor on my raspberry pi 2. It does not give me feed back information. i have my ARM i2c protocols on and i wired it correctly but it ...
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12 views

Is it possible to access an Android Phone's volume permission and control it with RaspberryPi?

I want to have a wireless network using RaspberryPi where it connects with an Android phone, accesses its volume permission and turns it down. Any inputs on how to go about this?
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1answer
843 views

How refresh browser after lose Internet connection?

I am using a Raspberry Pi 2 to show a webpage, using Midori, that shows the information given after invoking a webservice each 12 seconds. For some reason, when Raspbian lose Internet connection the ...
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1answer
402 views

Raspberry not booting up after trying kernel compilation

I had placed fresh noobs on SD card and booted Raspberry Pi many times in the past. To install a custom kernel, I went with the follwing steps: git clone --depth=1 https://github.com/raspberrypi/...
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2answers
294 views

7 color flash sensor does not blink

I have a raspberry pi 2 Model B v1.1 and 7 color flash sensor. I want to flash the led to get my hand into practice. This is my first program with raspberry pi and unfortunately i failed to flash the ...
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1answer
358 views

How can I configures my raspbian to show console in it's display?

I have a touch display (KeDei 3.5 inch SPI TFTLCD version 3.0 20015/12/1) and a raspberry pi 2 model B v 1.1. I downloaded the last Raspbian Stretch Lite image (https://www.raspberrypi.org/...
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1answer
278 views

Raspberry Pi RStudio

I have used link1 and link2 and keep getting errors on cmake .. -DRSTUDIO_TARGET=Server -DCMAKE_BUILD_TYPE=Release. Error: CMake Error at /usr/share/cmake-3.6/Modules/FindPackageHandleStandardArgs....
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2answers
38 views

Issues running Kivy and Flask together on Raspberry Pi 2 with touchscreen

Setup Kivy 1.11.1 Flask 1.1.1 Python 2.7.13 Issue I have an issue running together a Kivy app and Flask as thread on a RPi2 with a touchscreen. It is similar to the issue mentioned in this post ...
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1answer
333 views

How to use MATLAB at host PC with Raspberry Pi

I'm trying to connect MATLAB with raspberry pi 2 b+. have already instlled the raspberry pi addon on MATLAB at the host LAPTOP. The configuration - Matlab(Host LAPTOP)-<---->ETHERNET<---->...
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2answers
319 views

Raspberry Pi flashing rainbow screen

I used etcher to load the image of the raspbian lite onto a micro sd card. When I try to boot up my raspberry pi with a previously used sd card it works. Then I take out that SD card and try the new ...
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1answer
328 views

Getting started with nRF24lE1 on RPi2

I decided to ask you for help because of despair - I don't understend how to start working with my nrf24le1 (32 pin version) on Raspberry Pi 2. What I do: I connect nrf24le1 using following pins: ...
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1answer
336 views

Unable to connect wifi in Raspberry Pi 3 and os design for navio

The link below shows the images of the output error, i`ve been working this for hours I follow instructions from here but still doesnt work . Hoping that someone would help me figure out the problem , ...
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1answer
637 views

Connecting 4 HX711 to one Raspberry Pi

I have four individual scales that are each connected to a HX711, those HX711s are each connected to the Raspberry Pi. I'm a beginner in python as well as this Rasberry Pi. how do i properly code this ...
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3answers
2k views

How do I connect a Raspberry Pi to my computer using HDMI?

I have inserted my SD card and all that stuff but when I insert the HDMI into the computer it does not seem to load up, how can I make it loadup with my computer? Do I need Ethernet or something like ...
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1answer
35 views

Can a voltage at a GPIO pin with no mode set harm the pi

I have a Raspberry Pi 2 Model B, and I plan on using the GPIO pins to detect whether a voltage is present or not. However, the circuit that controls the voltage levels runs independently from the pi, ...
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1answer
471 views

Raspberry Pi Model 2B Hostapd installation error: Unable to locate package

So, I am trying to set up my raspberry pi model 2B as a wifi hotspot. All the articles recommended installing and using hostapd and dnsmasq. I was able to install the dnsmasq package without any ...
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1answer
599 views

Installing Kvaser Drivers(Linuxcan) for RPI

I have been attempting to install Kvaser drivers onto a RPI 2B and have been follwing the instructions listed in the following link: https://www.kvaser.com/developer-blog/building-canlib-linuxcan-...
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4answers
142 views

How to know the IP address of a Pi without an Ethernet or a display

I use a raspberry Pi 2. I have already installed raspbian and configured to a network using a usb-wifi a while back. Now I've moved to another place and I don't have an ethernet cable/ hdmi ...
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1answer
3k views

Raspberry Pi Live Streaming using Picam [Audio+Video]

I am currently using picam software to stream audio and video from Raspberry Pi using a NOIR camera and a microphone. One way audio and video is working fine. I need a two way audio connection but ...
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2answers
4k views

Build a customized Linux kernel for the Raspberry Pi

I downloaded a Linux kernel "linux-4.1.13.tar.xz" from kernel.org that I want to compile it for Raspberry Pi. Is it possible?
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1answer
549 views

Raspberry 2B multiple static wifi connections

I have a problem cofiguring Raspberry's 2B wifi connection. I have a usb wifi adapter that is detected by raspberry. What I want to achive is to connect to wifi immediately after boot. I need only to ...
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2answers
367 views

Trying to interface with the serial port with a simple program

Hey I am trying to work with the serial port of my raspberry pi model 2B with a raspbian jesse OS. I have disabled the serial login shell over serial in the advanced options. I have enabled uart in ...
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2answers
5k views

Why does the Sense Hat / Astro Pi show the wrong temperature and humidity?

I recently bought the sense-hat, previously called astro-pi. Unfortunately the temperature shows 28 to 31 degrees Celsius from both temperature sensors on the board. They often show around 30 degrees ...
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1answer
2k views

Problems installing Scipy stack for Python3.6 on Pi-2

I am faced with an apparent time consuming problem or something else when I try to install scipy with pip for python3.6 on my RPi2 model B. OS is Raspbian minimal (jessie). I am using a RPi2, and I ...
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2answers
1k views

Waveshare 4inch LCD drivers, error after installation: PANIC: VFS: Unable to mount root fs on unknown-block(179,2)

Problem I am attempting to install the drivers for this Waveshare 4inch LCD (A) touchscreen; however, after I have installed the drivers and reboot I receive the error (displayed in the HDMI monitor, ...
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1answer
44 views

TFMini Plus LiDAR not working

I'm trying to work with a Benewake TFMini Plus Lidar sensor in a RaspberryPi. I'm using a USB-2-TTL serial adaptor, which is working properly according to the tests I've ran. I'm testing the sensor ...
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3answers
589 views

Drive DC motors using L293d motor driver board

Can anyone help me with the connections of the below shown Dual H-bridge L293D motor driver with the Raspberry pi 3 to drive DC motors? I don't have much experience in Electronics as I am a CS ...
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3answers
5k views

Raspberry Pi live stream through webcam to android phone

I am trying to broadcast video from web cam connect with Raspberry Pi to Android app, for that I used 'motion', by this it can stream video over local network only, using http://RPi_addr:port but now ...
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1answer
20 views

polling gpio raspberry 2 doesn't work

i'm writing a library for my raspberry pi 2 for gpio control. I'm trying to test a function for read a gpio driven by interrupts with sysfs but i can't do that my function stops in poll() function. ...
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1answer
555 views

Use MCP23017 pin for read data

I just get an MCP23017 circuit and wired it to my raspberry pi like in datasheet. I am able to set pins for hight/low (tested with leds) using this code: import wiringpi as wiringpi from time import ...
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1answer
1k views

Problems in getting two camera feeds via an OpenCV python program

I'm running a Ubuntu 14.04 LTS on my RPi 2. I've OpenCV 2.4.9 installed on it. While running a simple camera capture program works fine. Here is a code for it. import numpy as np import cv2 from ...
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3answers
452 views

Running a script on autostart using rc.local

I would like to run a script on start-up with my Raspberry Pi. I've followed some guides and the easiest method seems to be editing the rc.local file, which is what I did. So I opened up the rc.local ...
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1answer
81 views

Cannot find wlan0 wifi dongle

I have tried multiple tutorials on how to setup wifi on my Raspberry Pi 2 but none have worked. New to Linux, hoping someone can help. When I highlight my network connection in the toolbar I see ...
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1answer
676 views

Analog psp thumbstick not working with analog to digital converter on Pi model 2

I am working on a portable RPI 2 retropie (another version of Raspbian) powered game console. I have bought an analog psp thumbstick, and an mcp3002 analog to digital converter, that I want to use for ...
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1answer
3k views

Help reading audio data from I2S microphones

Using the Adafruit I2S MEMS microphone breakout board and the Raspberry Pi 2B, I am trying to read in stereo input using PyAudio and pass the data through a FFT to analyse. However I am not able to ...
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1answer
58 views

Pi 2B won't update TeamViewer

I've recently tried to log into my Raspberry Pi (2B with 1GB running Jessie) using TeamViewer and found that my TV software is out of date. I needed to update TV to version 14. When I downloaded ...
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1answer
67 views

How to transmit hand gesture data from a laptop to Raspberry-pi

I am making a hand gesture bot. In this hand gestures are detected from a laptop using image processing (used OpenCV & Python). I don't know how to transmit real-time output wirelessly of image ...