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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1answer
180 views

Apple keyboard Caps Lock LED doesn't light up though caps *are* locked

I have an Apple keyboard (French disposition) that's always worked in all the GNU/Linux distributions I tried (Fedora, Ubuntu, Mint, Arch, Gentoo, Debian). Only with Raspbian do I have issues, the ...
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1answer
1k views

Cannot disable dhcp and set static ip

I'm currently working on a little hobby project with my Raspberry Pi 2 and I'm not sure how to proceed. I have basic knowledge of Linux but i still have much to learn. What I'm trying to accomplish ...
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1answer
240 views

something similar as jira for rpi

I have rpi model b 2. I wan't to install some kind of management solution tool (like jira). Problem is I don't know what should I choose, because rpi have too small resources. For an example, jira ...
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1answer
300 views

How to change Noobs

I'm very new when it comes to the raspberry pi as i got it as a present. It had a pre-built sd card with it, with Raspian Wheezy already installed. However i want to change it to Raspian Jessie. ...
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1answer
753 views

Control web interface on Raspberry Pi with GPIO inputs

I know that there are a lot of articles about controlling Raspberry Pi outputs via web interfaces, but there is nothing about doing the opposite. I would like to control web interfaces that runs on ...
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1answer
3k views

How to send live video frames from Raspberry Pi to my Computer

I need to send live video frames from my Raspberry Pi with a PiCamera (or USB Camera is fine too) to my Computer. From my computer, I will use the frames for Image Processing and Computer Vision using ...
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3answers
14k views

Can I power a Pi through a 5V pin?

The PIN mapping of the Raspberry 2B says: The red ones are 5V pins. Are these just used as 5V out pins when power is connected through Micro USB? Or is it also possible to power the Raspberry Pi via ...
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2answers
75 views

Trying to create an app on RPI to communicate 2 ways with server/website [closed]

I could use some advice for this project (beginner here). Situation: We have 10 or so families who need reminders to take medicine, appointments reminders etc. We would like to find a way to have ...
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2answers
520 views

File content disappears when Raspberry Pi is unplugged

I tried to create a config file on my IoT device that is used for storing content when a user changes a setting via a menu. I found that every time the content of file is changed and then the system ...
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3answers
2k views

Raspberry Pi B+ - Cannot Expand File System Screen

I bought a raspberry pi B+ model about a year ago to get into raspberry pi projects and it worked perfectly fine after installing Raspbian. I had done a project to drive a car over IP through an app, ...
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1answer
101 views

Help securing my pi

Recently I'd noticed that my pi had been running slower than usual, and some processes had been killed with the following message in /var/log/syslog: "Out of memory: Kill process score or sacrifice ...
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0answers
143 views

Sharing eth0 to eth1

The situation: Just moved into new student accommodation. With the internet access they allow you to assign 4 MAC Address of devices you wish to have Internet access on, got me thinking if sharing the ...
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1answer
51 views

Program not behaving properly after added to pi startup

I've written a small program that spins a motor throughout the day on the Raspberry Pi 2 Model B, using its GPIO pins. The program works perfectly well, and hasn't had any issues with the GPIO pins. ...
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2answers
5k views

What is the purpose of SCLK pin of SPI protocol?

I read about SPI(Serial Peripheral Interface) protocol and try to understand their pin functionalities. Where i read about SCLK pin, which is provide serial clock to synchronize the master and slave ...
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1answer
62 views

Raspbian sftp error. Can't log in

I have the following issue. When I try to login as the pi user with the local IP adders I get this error: ssh: connect to host 192.168.0.101 port 22: Connection refused Couldn't read packet: ...
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2answers
4k views

Pi 2 Model B green light flashes 4 quick 4 long

Backstory My Raspberry Pi is a version 2 Model B. For my company, we always use this model with the same SD card images for years now. Recently we bought new Pis from a different company, the same ...
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1answer
5k views

Why can't my Python script find a custom defined environment variable?

I have a Python 2.7 app that uses Tkinter. The problem is that I cannot read the environment variables I defined when I use Tkinter. Was thinking this was a problem I am having with Python/Tkinter ...
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1answer
489 views

Plotting information from analog-to-digital conversion

I am reading an analog signal in volts (0 - 1 V) using an adafruit ADA1115 chip. I want to save the data with at least 100 sps and plot it real time at the same time (plotting can be done at 1-10 Hz). ...
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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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1answer
452 views

Raspberry Pi instantly logs me out

When I ssh into it, it instantly drops the connection. When I hook it up to the monitor it accepts my login, shows the last login time (about 30 seconds before this attempt) the kernel version, the ...
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0answers
532 views

Managing employees' attendance using Face Recognition

I'm creating an employees' attendance management system using Face recognition on RPi (2 or 3). I use Python face_recognition library for face detecting and recognition. I currently think of two ways ...
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2answers
3k views

How to connect multiple spi devices (ADCs) to Raspberry Pi?

I want to connect 8 ADCs to the Raspberry Pi, however, the board has only 2 Chip Enable pins. I searched around a bit and the option that I found was to use arbritrary GPIO pins to act as CE pins. And ...
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0answers
522 views

Having issues trying to connect to Windows 10 Share folders with Pi 2

First off, I'd like to state that I'm not a complete noob when it comes to Linux, in general. I just haven't worked with it as my primary OS and my interaction with it has been on and off so I'm a ...
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1answer
197 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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2answers
2k views

Use GPIO to trigger button press in software

I have a ceiling fan remote that I want to control using the Raspberry Pi. Instead of sending RF signals or buying a Wi-Fi wall switch to do any of this, I'd like to use an existing RF remote and ...
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1answer
601 views

SPI Communication with ADS7851

I'm currently trying to communicatie Raspberry Pi 2 B+ with ADS7851, an adc chip made from TI. ADS7851_DATASHEET I've done pretty much of research, but I'm still stuck on how to communicate in SPI ...
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1answer
3k views

Raspberry pi 2 is not booting, Both LEDs are on but not blinking

I use raspberry pi 2 with ubuntu mate 16.04. Suddenly my raspberry pi is not booting. The monitor can't find any signal (via HDMI). Both the Power and ACT light is on when I start the PI, but ACT ...
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1answer
269 views

Can't extract ubuntu-mate .xz

I downloaded Ubuntu mate from Ubuntu-Mate Website . I am unable to extract the .xz file in my mac. On extracting file, it generates .cpgz file. Please help me to extract the .img file and boot on a ...
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2answers
51 views

Raspberry - same address in every location

I have an RPI2 what I want to use as a "developer platform" with git and mysql server. I using dyndns for remote access, but! when I home I can access it from 192.168.1.125 and when I'm remote I can ...
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1answer
1k views

Raspberry pi 3 touch screen 3.5“ not working fine but it does with 7”

I'm working with a pi 3, I use Jessica img and waveshare driver : http://www.waveshare.com/wiki/3.5inch_RPi_LCD_(A). I followed the instructions and the touchscreen 3.5" is working except for touch ...
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0answers
207 views

Raspberry Pi + Windows 10 IoT Core + RS485

Has somebody ever worked with windows 10 IoT Core and used RS485? I would like to receive some signals from the RS485 device. I would like to do this with Windows universal app.
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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
579 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
579 views

How can I provide my raspberry pi 2 with 3G/4G data?

I'm currently working on a project on my Rpi 2 model B that requires connection to internet through a cellular network via 3G/4G connection. I found some usb modem dongles and some modules, but they ...
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0answers
93 views

Raspberry pi wlan0 appears but not enable to enter internet

I have raspberry pi2 and I want to connect wifi with adding wifi adaptor to my raspberry pi. So I did some adjustments : sudo nano /etc/network/interfaces auto wlan0 allow-hotplug wlan0 iface ...
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1answer
63 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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0answers
27 views

Wi-Fi stays disconnected for 15 minutes

I have a Pi Zero that is always running a Python script connected to a MySQL database on a website I am hosting. Every 5 seconds, the Pi updates a time field in the database, and there is a cron job ...
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0answers
480 views

Disable Screensaver of XServer on Raspbian Jessie Lite

I setup a Raspberry Pi 2 with Raspbian Jessie Lite in read only mode. To run a Qt application I installed the packages "xserver-xorg" and "xinit". I am starting the application automatically after ...
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4answers
1k views

Port forward of Raspberry Pi 2 does not work

I want to to get an external IP for my raspberry pi 2 on port 80. I am using a GRBL web page for CNC, so I want to get the web page online. I tried to port forward Raspberry Pi 2 IP, but it doesn't ...
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2answers
1k views

Huawei E398 LTE stick disconnecting

I have a problem with the disconnection of the modem after several seconds of connection. Reconnecting is not possible "Cannot open /dev/ttyUSB0: No such file or directory": --> Connect time 0.6 ...
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1answer
1k views

Configure Raspberry Pi for use eth0 and wlan0 at the same time

I am using 2012-07-15-wheezy-raspbian OS on my Raspberry Pi. I have connected Raspberry Pi to the router through lan cable. My laptop is connected to the router through Wifi and hence i can connect to ...
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1answer
2k views

Unique Identifier for raspberry pi board [closed]

Is there any unique identifier like the serial number (00000000xxxxxxxx), which is specific to an exact board? And which cannot be spoofed or cracked or changed? and can also be retrieved to identify ...
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0answers
748 views

No sound when PulseAudio is running

I have a Raspberry Pi 2 running the latest Raspbian jessie. I have sound working just fine via ALSA and analog out. Recently I installed pulseaudio and have found if pulseaudio is running I no longer ...
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2answers
95 views

Is communication between Raspeberry Pi 2 and smartphone possible using USB

I'm currently trying to make a communication between my Raspberry Pi 2 and my smartphone (Samsung Galaxy S7). I'd like to do it using a USB cable, does anyone know if it's possible and how to do it?
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0answers
1k views

MMAL failing to create camera component

I've been messing around with Raspicam and MMAL on my Pi 2 for a bit now and today when I tried to run my code, I got this error. Thought it might be my code, so I tried running one of the example ...
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1answer
3k views

Raspberry Pi 3 Model B v1.2 - Connect to old TV via Composite Video Output

I have a Raspberry Pi 3 Model B v1.2. It works great on my TV that has HDMI port, but I am trying to hook it up to a TV that only has A/V and Composite Video inputs. From what I understand, I needed ...
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1answer
125 views

cannot find nail for send email

I've this script of transmission daemon that send the email: #!/bin/sh ## ## User-configurable Variables ## # Where "nail" is installed on your system. # We need this to actually send the mail, so ...
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1answer
83 views

Raspberry pi stuck on boot after edit config.txt

I've edited config.txt, in particular gpu_mem= 944 and now when I start the raspberry this is stuck on: "A start job is running for dev-sda1.device (35 s / 1min 30s)" what can I do? PS: I can't use ...
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1answer
420 views

Raspberry Pi 2 elm 327 OBD Bluetooth connection Problem

I am using a Raspberry Pi 2 Wheezy with a Bluetooth dongle to capture data from an ELM 327 OBD. I can list the OBD device but I am unable to connect to that through Bluetooth. I am getting an error ...
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1answer
167 views

Logic to print text in SSD1306

I was writing a program for my SSD1306 oled display from scratch without any third party. I have successfully initialized the display. But I dont know the logic to turn on the pixels for a particular ...