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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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What is the maximum distance over which two raspberry pi can communicate via WiFi? [on hold]

I want to know whether two raspberry pi can communicate if they separated by 500 meter.
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32 views

Any good resources on how to send pics to an email from a security webcam connected to raspberry pi? [on hold]

I'm an absolute newbie about raspberry pi as well as coding. I want to install a security webcam in my garden to send me emails with a snapshots whenever there is an activity in my fronside garden. So,...
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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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0answers
15 views

10 pins AWM 20624 80C 60V VW-1 compatible with RP?

Is there any way to use a 10 pins map (CSI) (AWM 20624 80C 60V VW-1) on a Raspberry PI ? The map is really smaller, so I wonder how to make it work ?
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1answer
20 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
24 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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2answers
38 views

Run Python script from HTML input button [on hold]

I have some HTML form code: <form action="proses.php" method="post"> Nomor Polisi : <br><input type="text" name="nopol"><br> <input type="submit" id ="submitButton" ...
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0answers
36 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
32 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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10 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
29 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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How to calculate consumed energy for Raspberry Pi in Internet of Things?

I want to run some algorithm and generate data from that algorithm and transmit that data to another raspberry pi. In this process, I want to calculate energy. Like, how much energy did that pi ...
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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
41 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
32 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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36 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
54 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
71 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
48 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
22 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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29 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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45 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
43 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
29 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
27 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
75 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
67 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
40 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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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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31 views

Setting low-pass filter on MPU6050 sensor?

I'm trying to collect data from a MPU-6050 sensor using a Raspberry Pi 2 Model B+. I'm using this Python library to collect the accelerometer readings. From what I can tell from reading the source ...
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2answers
71 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
67 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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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
34 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
37 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
24 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 ...
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30 views

Change hard corded MAC address

Is it possible to change a hard coded MAC address ? I bought a TP-Link tl-wn722n WiFi Adapter but I can't change the MAC address. (Raspbian, Raspberry Pi 2) I tried several methods, also macchanger ...
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1answer
21 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
31 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
34 views

read-only filesystem after reboot..can't seem to find a straight answer hot to fix?

Im new to rasbery pi.. i would like to get my PI back to normal without having to reinstall everything!(next time ill back up or use puppet.) I ran: sudo fsck -n -f i got the below: Journal ...
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1answer
37 views

Convert existing Raspbian image to NOOBS image?

I currently have an SD card with a Raspbian (Stretch) install, a whole bunch of files, an OpenVPN server, etc. However, I would like to run Kali Linux and LibreELEC on it as well. Is there any way I ...
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0answers
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Windows 10 IoT not updating with windows update

Why is my windows update stuck on downloading updates? How do I kick it along? From the apps menu I select Windows Update tile. I then have the following screen which I have left on overnight and ...
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Is there a limit on Raspberry PI's display size?

I have been using Raspberry PI 2 and 3 for the last year and a half with no problem. However, over time I have noticed that different sizes of display connected to the PI effected how my software ran. ...
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1answer
156 views

Multiple /etc/rc.local?

I run a Python program in a screen session which is started from my /etc/rc.local with this command: su me -c "screen -d -m /usr/bin/python /mnt/usbdrive/pgms/mypgm.py" Recently my program has been ...
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1answer
96 views

Pi 2B, Under-voltage detected!, no lightening bolt, +5 is rock solid at 5.01VDC

This is a weird one - have had 2B in service for three years, but it crashed last week. Rebuilt with a new Pi 2B+, but saw undervolt errors on the rebuilt system that would have gone unnoticed, so ...
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78 views

Remote debugging a python script fails

I am running into problems with remote debugging a Python script on a Raspberry Pi 2 Model B Version 1.1, where I followed the advices in this blog post. The script basically starts with import ...