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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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Unable to detect pi cam

I have a RPi 2 B for which I recently got a PiCam. I connected it to my Pi and when I powered the Pi a red LED on the cam came on. I tried enabling the camera module in sudo raspi-config , it even ...
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1answer
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Why is my RTC DS3231 but seems DS1307?

I bought a RTC DS3231 because of the accuraty of time (2ppm, I was searching an accurate RTC). When I received it, I checked that in the encapsulating it is as well marked like DS3231. But, after ...
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7 views

Frequencies available for wavechaining using PIGPIO library

I am working with the PIGPIO library to run stepper motors. I am using wavechains to the STEP pin of the driver. I need help regarding the possible pulse frequencies available for wavechaining. I ...
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7 views

Linkit smart 7688 MPU Live video streaming 10+ seconds leg how to minimize it

i am live streaming my cam connected with linkit smart 7688 mpu and streaming live video on button press but have leg of almost 10+ seconds any one plz guide me how to optimize it as best level. even ...
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24 views

Password Manager for Raspberry (online AND offline access)

I'm searching for a good password manager. And yes, i know, google is full with tutorials for that kind of stuff. But all password managers i found, are only online usable. I need a solution where i ...
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25 views

What will be the output when “ifconfig” command is entered after running the 6lbr, installed on RPi?

im having some issues with accessing the 6lbr web server page. I just need to know what is the output you get once you checked your interfaces by entering "ifconfig". In mine, I just get only the ...
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2answers
70 views

Routing issue - use vpn gateway router

Dear Raspberry community, I am using a raspberry with newest stretch version and facing a routing issue. My network: LAN: 192.168.178.0/24 Subnet mask 255.255.255.0 Default eth0 Gateway 192.168.178....
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1answer
20 views

Attribute and Type Error using Button class in Tkinter/GPIO Zero combination

I'm new to programming and I'm trying to write a simple program to change the blink rate of an LED using a GUI. When I try to run this on my RaspberryPi 2B running Raspbian, I get the following ...
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11 views

PIPE jack_capture on pi_fm

I want to transmit sound over FM with a Raspberry pi. To avoid latency, I would like to use jackd rather than ALSA to process audio. I try this command to route stdout into pifm : jack_capture -ws |...
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1answer
50 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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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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14 views

Scan search USB port and manipulate the data received from wireless modem

Any example which helps me to search the automatic USB port availability in raspberry pi and sends the information of wireless sensor network, which uses the wireless modem as a gateway receiver. I ...
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0answers
40 views

Raspberry Pi 3.5 Inch Display Works on Pi 2 B but not 3 B+

The exact screen is this one. http://www.neosecsolutions.com//products.php?28 On a Raspberry Pi 2 B it boots to raspbian. On the 3 B+ it gives a white screen, The Raspberry Pi 2 B has a white screen ...
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3answers
65 views

Add-on sd card in pi?

I want add-on SD card reader/writer/slot/controller in my raspberry pi so that i can keep OS separate from my program. Primary SD card will load OS and work normally and program & data will remain ...
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23 views

Connecting multiple wifi network

I am really new to the pi world, I have a quick question. I am planning to build a small wifi surveillance system with Pi. So basically 4 wifi camera's streaming data. I am planning to use this camera ...
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1answer
49 views

Configure pi so it doesn't show boot info - splash screen only

I'd like to configure my pi 2 so that I dont see any booting info. I'd like to have a splash screen (or video if thats even possible) and boot into a C++ game I wrote.
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0answers
27 views

Help - Incorrect reading of magnetic encoder

I am a beginner having trouble to read a magnetic encoder. I have found the following code I found that I am using in order to read the encoder values: #!/usr/bin/env python import pigpio class ...
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2answers
31 views

Connecting 2 raspberry pi zero to one spi screen

I wanted to know if you can connect 2 pi zero's to 1 spi screen and have a switch to switch between them?
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1answer
44 views

RPi 2 B No wireless interfaces found - eth0: Link is down

I tried to setup a new RPi 2 Model B using NOOBS. I followed the steps the "Getting started" guide.. At the "finishing the setup" step, Pi was not able to find any wifi connections to update the ...
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0answers
135 views

ImportError: libQtTest.so.4:

I was installing opencv on Raspberry and it was finished and import cv2 worked in Terminal.But when i running following code it gave the error import cv2 ImportError: No module named cv2 import ...
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1answer
44 views

Setting up a wifi dongle

I have a raspberry pi 2 running raspbian, and bought a wifi dongle to use with it. I can't seem to get it connect to the internet. I have tried following the guide given by the seller, but it was ...
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0answers
13 views

Raspberry Pi connects to OneM2M platform

I'm a total newbie here. I've made a project using mainly led bulb and ultrasonic sensor in Raspberry Pi B model (without Wi-Fi). So far everything works like charm. However, my main goal is to ...
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1answer
34 views

GPIO LED Python

I am not sure what I am doing wrong here. I found this guide on but it's not working for me. The program does not output any errors but the LED doesn't light up. I have and LED with + on GPIO 12 ...
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0answers
62 views

USB WiFi dongle not being detected as WiFi device

I bought a Wifi dongle from ebay and it gets recognized by the pi, but not as the correct device. the device is Realtek rtl8188ftv lsusb shows it as Bus 001 Device 006: ID 0bda:f179 Realtek ...
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1answer
42 views

what are the some useful resources to learn Raspberry pi?

I am a newbie in IoT, but have a little bit knowledge of programming languages: python, nodejs etc. Can someone point me toward some useful resources to learn Raspberry pi 2?
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Running cockroachdb on a Raspberry pi 2 model b (32-bit) as a docker container

I'm trying to run cockcroachdb on a Raspberry Pi within a docker container, but they only provide 64-bit versions of cockroach as they explained it here . But I do see references of running cockroach ...
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1answer
48 views

My Raspberry Pi is being shown as a Dead IP Host on Advanced IP Scanner hence I'm not able to connect my Pi to laptop

I am currently working on a project using the Raspberry Pi 2 Model B board. All was working fine until today when I was connecting my Pi to my laptop and the IP host for my Pi was displayed as a dead ...
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0answers
42 views

Raspberry Pi 2 B: Unable to SSH in headless mode after reboot

I am using Raspbian Stretch Lite, and trying to setup a Pi-hole server. I have placed a ssh file in the boot directory using touch ssh Previously I was able to connect using ssh pi@192.168.3.104, ...
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1answer
34 views

connect a 12V device to Raspberry pi

I need to connect a 16mm press Push Button Switch flat round Latching Self-locking 1NO 1NC with 12V rating to Raspberry pi3. (https://www.aliexpress.com/item/16mm-Metal-brass-Push-Button-Switch-flat-...
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1answer
60 views

Someone changed the pi password on the RP2. Is there a way to undo it?

I was stupid enough to leave the RP2 exposed to the internet with the default password (for the momentary sake of convenience) for a very short time and someone (I am assuming an automated scanning ...
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2answers
197 views

How to Check SD card is working or not in Raspberry Pi?

If i put sd card in raspberry pi and want check whether it is working or not. Is there any procedure in raspberry pi to check it. I want to check my either my SD card is broken down or corrupted.
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1answer
58 views

How to know the buffer size of a Raspberry Pi 2 b?

I would like to know the size of my I/O buffer (defined as the queue where the packets arrive, e.g. from internet, and wait to be proccessed). How could I find this size? And if the buffer is too ...
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1answer
28 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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33 views

Raspberry Pi 2 model B BCM 2835 [duplicate]

I have a Raspberry Pi 2 model B, so I am suppose to have a BCM2836 processor. But, when I check it in /proc/cpuinfo the result is not BCM2836 but BCM2835. What is it wrong? What processor do I have? ...
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78 views

Velleman's VMA405 RFID module with Raspberry Pi

I bought a the Velleman's VMA405 RFID read and write module, and the guay in the store told me that it's compatible with Raspberry Pi. I've been researching for a while and I couldn't find anything ...
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1answer
62 views

How can I debug why SFTP is not working while SSH is working?

I have an arcade run on raspberry pi 3 flashed with RetroPie 4.4. I already enabled SSH capability via raspi-config menu Test I can SSH into my Pi perfectly fine, but I can not SFTP into it. ...
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1answer
78 views

How do I prevent Pi prompt for username and password ? [duplicate]

I have an arcade run on raspberry pi 3 flashed with RetroPie 4.4. Just now, I'm not sure what had happened to my Pi hardware, network, or even SD card when I boot, I kept getting prompt to enter the ...
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1answer
33 views

Raspberry Pi 2 model B with sim800 and PIR to detect motion

I am working in the project that idea is to detect the motion using PIR and picamera. will send email alert to include with capture of the movement and SMS in the same time. the component I plan to ...
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2answers
131 views

Raspberry Pi - Connect and power RS485 device

I am trying to connect a Raspberry Pi to a OSDP card reader. The reader communicates via RS485, and is powered by 9-27V DC. Unfortunately, I have not been able to succeed with a serial connection in ...
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2answers
52 views

Raspberry Pi for temperature measurement [closed]

I want to start by saying that I’ve never built a raspberry pi, but after doing some reasearch I believe these tiny computers are a good base for my project. However, if anyone has other ideas, I’d be ...
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2answers
68 views

Python on Raspberry Pi

For my High School final project I will do a portable retro arcade machine. I think Raspberry Pi is a candidate for this application, and I've done some research on it. However, I've not been able to ...
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1answer
49 views

Mobile camera as a webcam for Pi 2 via USB

How can I use a mobile camera as a webcam for my Pi 2 text recognition idea by connecting the camera to the Pi using USB?
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0answers
46 views

Raspberry pi couldn't detect my NFC device Adafruit pn532 v1.6

I am new to raspberry pi and nfc. I am currently doing a project which require me to read and write using NFC with raspberry pi. I am using the Adafruit NFC module PN532 v1.6 together with nfcpy ...
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1answer
16 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
96 views

Count time between two pulses in nano seconds

How can i count time between two pulses in nano seconds by using raspberry pi?
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1answer
177 views

Stream Deck Using PI 2

I have a RPi2 1gb. I've recently got a touch screen for it and have decided that I actually should use it for what it was intended for. Programming! So my adventure starts here. I want to make a ...
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19 views

Openelec new installation

I am trying to install Openelec on my Rasberry Pi2, I downloaded from below links: https://www.techworld.com/download/operating-systems-distros/openelec-803-64-bit-3329878/ https://openelec.tv/...
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3answers
39 views

Raspberry pi weather station dampness [duplicate]

I am setting up a rpi weather station with several rpi 0's (one for each sensor) and a main rpi 2 (for the data collection and storage). Does anyone have any ideas on how I can go about damp proofing ...
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1answer
69 views

What is the pixel format for Raspberry Pi framebuffer

Good afternoon, I'm trying to programmatically display an image to a 3.5 inch TFT display mounted on /dev/fb1 using the following code: Using trial and error I determined the pixel width to be 16 ...
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1answer
26 views

My Raspberry Pi B+ has the Ri 2 B pinmap

I trying out different java programs for my RPi B+ V1.2 and as far I have only tried to blink with a lamp for a few seconds. It works. Now I want to try to blink with a lamp by using a button. In ...