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.

390 questions with no upvoted or accepted answers
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How Can I Emulate An x86 CPU on a Raspberry Pi with Qemu?

NOTE: 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 internet to try ...
7
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1answer
1k 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 ...
3
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3answers
11k views

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 ...
3
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0answers
541 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 ...
3
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1answer
350 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<---->...
3
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0answers
2k views

Pi 2 Windows IoT support for onboard CSI camera port

I am working on IoT technology, in one of my project I want to connect to on-board camera with Raspberry Pi 2 having Windows 10 IoT core. Two months back I found Windows IoT on the Raspberry Pi 2 ...
3
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0answers
2k views

Arecord not working with USB Microphone anymore

Before I start, I'd like to tell you that I've used arecord in the past with the Raspberry Pi 2 using the same USB Microphone and it has worked just fine. For some reason, it doesn't seem to work ...
3
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1answer
492 views

How to use PI4J with a brushless motor?

I have a Raspberry Pi 2 model B. I would like to be able to control a motor with a regulator and PI4J. I put the black cable to a ground pin and the PWM pin to pin 26. I've worked with servos before, ...
3
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0answers
227 views

How Can I Properly Ground My RPI To Avoid Static Interference?

I have researched every where for this problem and cannot find a direct answer. I am currently working on a project which involves a large 20ft conveyor belt transferring product into a Plexiglas box ...
3
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0answers
3k views

Pi 2, keyboard/mouse not recognized through USB hub

I am trying to get the keyboard and mouse control from a Startech crash cart adapter working smoothly on a Pi 2. The adapter has an internal USB hub (Alcor, 058F:6254) and behind that a virtual ...
3
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0answers
546 views

Modbus on Raspberry Pi

I am quite new to Raspberry Pi and Modbus. I am going to implement a Modbus RTU on Raspberry Pi using libmodbus. I followed this totorial as a simple Modbus test, but when I compile the bandwidth-...
3
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0answers
272 views

External HDD stopped mounting automatically in Raspbian

In Raspbian I used to be able to just plug in my external HDDs and they would be detected I could then find them in /media/ using WinSCP and transfer files to them. I haven't used Raspbian in a ...
3
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0answers
532 views

Raspberry Pi 2 and JavaFX8: Can't render small images without more GPU RAM

I'm trying to write a simple FX8 image display program on the Raspberry Pi2 without increasing the GPU memory beyond the default 64MB. I seem to get me a NullPointer Exception at com.sun.prism.impl....
3
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0answers
788 views

How to boot Ubuntu 14.04 for Raspberry Pi 2 under qemu?

There's an Ubuntu image for the Raspberry Pi 2 here: https://wiki.ubuntu.com/ARM/RaspberryPi I'd like to boot this image under qemu. I'd like to do it so that I can have some virtual build systems as ...
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3answers
52 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 ...
2
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0answers
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 ...
2
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0answers
62 views

Raspberry Pi requirement for water outflow detection from pump and switch off motor if no water coming

I have gone through this answer before i post question here, https://www.hackster.io/ben-eagan/raspberry-pi-automated-plant-watering-with-website-8af2dc https://mtlynch.io/greenpithumb/ https://www....
2
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0answers
63 views

Loopback SPI interface not working

I'm trying to do the loopback test for the SPI interface on my raspberrypi model 2 B V1.1, by following the intruction on this website : https://www.raspberrypi.org/documentation/hardware/raspberrypi/...
2
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0answers
41 views

efficiency of python sleep function to set a raspi pin HIGH and pause the script

I am continuously measuring some parameters using Raspberry Pi. I am using Python. When the measured value is higher than a particular value, I want to set a GPIO pin high (for some LED indicator) and ...
2
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0answers
634 views

hostapd.service not found

I am trying to make a Raspberry Pi 2 as a wifi access point in a standalone network. I followed this tutorial: https://docs.google.com/document/d/16hJS7fnPyKUwbvR33_nMku_b6XcYaBJXVpeCIMoJzcQ/pub At ...
2
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0answers
247 views

PI4J + Adafruit LCD with MCP23017

Got this device. Python example char_lcd_plate.py is working perfect. But I would like to manage it with Pi4J. I copied bits from python example LCD_PLATE_RS = 15 LCD_PLATE_RW ...
2
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0answers
183 views

Moonlight (Wifi): Dropped Frames, Multiple Errors, Crash

Casting any media from a PC to the RPi, other than on a Ethernet connection, results in a large number of errors, and an eventual crash. Streams are very responsive, and smooth at 720p at 30fps, but ...
2
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0answers
226 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.
2
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0answers
9k views

How to check whether SPI working or not?

I am totally new to Raspberry Pi. I am trying to simulate a sensor with raspberry pi where my - Devices Sensor: ANALOG DVICES ADIS16227-CMLZ iSensor (ADIS1622x/PCBZ) Device: ...
2
votes
1answer
988 views

Huawei E3372 force me to show a webpage on my raspberry pi 2

I have some Raspberry Pi 2 that launch a webpage on Epiphany at startup. I get internet connection with some 4g Modem Huawei E3372. Those modems are setup to launch 192.168.8.1/html/home.html at ...
2
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0answers
419 views

Install libfreenect (Kinect 360) on a Raspberry Pi Make error

I am trying to install libfreenect on a Raspberry Pi using the instructions found here: http://blog.bitcollectors.com/adam/2016/01/kinect-support-for-raspberry-pi-using-libfreenect/ On step 4, line 8 ...
2
votes
1answer
3k views

Huawei E3531 and Raspberry Pi 2

I want to connect a Pi 2 to the web using a 3G Dongle (Huawei e3531). But for some reason I can't get it to work. It is a freshly installed Jessie with update & upgrade done. Modeswitch was ...
2
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0answers
213 views

RPI 2 B died, PP9 test point should throw 1.8v and throws only 0.02v, how do I fix this?

Last night I unplugged it "unsafely" and today it doesn't start. What I get is a solid red light along with a solid green light. I have tried every possible combination (SD cards, Power supplies, OS) ...
2
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0answers
485 views

Understanding the memory map in QA7 document on the official website

The description of the first row says "GPU access". That looks confusing. Isn't the memory split for CPU and GPU usage? From most other sources the peripheral base is 0x3f000000. Why does it say ...
2
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0answers
623 views

Raspi CPU is not working?

My Raspi 2B is not booting properly now and it is hanged with instruction cpu1/2/3 is stopped during boot. Is my raspi getting damage or not? I used 5V 700mA power adaptor and some time I used 5V 2A ...
2
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0answers
338 views

How to register new devices with the Azure IoT Hub/How can I send new sensors' data to my IoT Hub without editing my code?

I am working on IoT Technology. I have doubt as I developed an IoT Project which is sending different sensors data to the Azure IoT Hub. Next I bought one more Raspberry Pi 2 device and deployed my ...
2
votes
1answer
699 views

How do I get the 74HC165 shift register to work with my Raspberry Pi and Java

I have been using the following link for reference... http://robsraspberrypi.blogspot.co.za/2016/01/raspberry-pi-adding-more-inputs-using.html // setup SPI for communication int fd = Spi....
2
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1answer
1k views

Adjust brightness of 7 inch Waveshare display

Is it possible to control the brightness or switch on and off the backlight of an Waveshare display via command line or a script? I'm using the 7 inch version (rev2.1) with a resolution of 1024x600 ...
2
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0answers
607 views

Random IO errors on i2c

I connected a raspberry to a i2c bus that holds two devices: an i2c io expander pcf8574A at 0x20, and a lcd controller pcf8576 on address 0x38. Both show up fine when running i2cdetect -y 1. When ...
2
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0answers
219 views

MCP3008 inconsistent reading

Okay, I've written a small piece of code for reading analog values from MCP3008 and it all works good I would say. But the problem is, the value changes depending on a frequency of which I'm reading ...
2
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0answers
340 views

Sending Message to Arduino From Raspberry Pi with NRF240l1

I'm trying to send string from Raspberry Pi from Arduino. I can pong out and pong back. But can't send string. I changed main code. I can't send. Here is my Raspberry Code.. #include <cstdlib> #...
2
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0answers
323 views

Unexpected voltage drop on GPIO 16

I have written a sprinkler timer system (Python) for the Raspberry Pi 2B+. The Pi is connected to a 2 line LCD, 4 switch circuits, and an 8-way relay board with all 8 relays being used, and the 5V and ...
2
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0answers
436 views

USB devices gets new ttyU* while still attached raspberry pi 2

Conditions: I use RP2 for data collection purposes and i am testing its limits. I use it next to diesel engine and its alternator.(I know pi is not for industrial use and this is a prototype.) There ...
2
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0answers
27 views

Raspberry Pi 2 Audio vs Video Clash

So, I'm having an interesting issue. Those of you who have seen me around know that I don't usually use a GUI of any sort with my Pi. However, I recently got another one and decided to make an ...
2
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0answers
2k views

How to connect to L2TP/IPSec VPN server?

I am trying to connect my Raspberry Pi (Raspbian) to my L2TP/IPSec VPN Server (a Synology NAS) but I'm having a hard time doing so. I've read some tutorials but it all seams so complicated, I'm a bit ...
2
votes
0answers
132 views

Problems with Kali on raspberry pi, plus some mac issues

Just yesterday I was able to boot Kali on my raspberry pi without much of a problem. The following day, however I tried booting it as usual. It showed the boot screen and everything with the four ...
2
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0answers
499 views

Why can't I set my app to run on startup with Windows IoT?

I have an app that I would like to have run automatically when my Raspberry Pi 2 starts up. The Raspberry Pi 2 is running Windows 10 IoT. I am able to deploy my app and run it with the Visual ...
2
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0answers
93 views

Game Server Lag Every 2 Minutes or So on Raspi 2

I run a DarkPlaces Quake server on my Raspberry Pi 2. Every 2 minutes or so, there is a massive lag spike in game play, but it's fine when it's not doing that. I have checked crontab, but neither my ...
2
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0answers
3k views

How to Configure OSMC to output composite video on Raspberry Pi 2?

I have an http://osmc.tv (a Kodi distribution) setup on my Raspberry Pi 2. It works fine when plugging in the HDMI cable for video output. However, the composite video through the combined a/v jack ...
2
votes
1answer
219 views

Stepper Motor Not Responding. Wiring Issue?

I am following the tutorial: But I am using a pi t-cobbler and a Pi 2. I am also using the ULN2803 driver. When plugging a button into the appropriate gpio spots on the breadboard, I am able to run a ...
2
votes
0answers
1k views

Raspberry Pi 2 low volume on headphone socket

I'm using a Raspberry Pi 2 as an AirPlay receiver connected into an external amp via the headphone socket, and running shairport-sync. I am seeing a low volume on the headphone output socket, such ...
2
votes
0answers
247 views

RF transmission on 314.88mhz

I've been playing around with transmission of RF signals with my pi for a home automation system. So far it has been working great. However, this was just for the 433.92mhz devices. I've managed to ...
2
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0answers
924 views

how to install netctl on lastest raspbian pi2

I have install lasted raspbian on my raspberry pi2. Unfortunally, it seem that netctl isn't installed, so I did: sudo apt-get update sudo apt-get install netctl Reading package lists... Done ...
2
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0answers
849 views

Pluging an Adafruit touchscreen on a HifiBerry DAC+

I'm trying to connect a Adafruit PiTFT 2.8" TFT 320x240+ touchscreen and a HifiBerry DAC+ on a Raspberry Pi 2 B. Is it possible? Do I need to solder the touchscreen card on the DAC+?
2
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0answers
357 views

Windows 10 IOT Core, Fails to connect using powershell (Objectnotfound measure-object:string)

I followed the steps provided by microsoft to flash windows 10 on a SD card. inserted this into the raspberry pi 2. It boots just fine showing me the defaultApp. I am able to connect trough ssh and ...

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