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Questions tagged [pi-3]

For questions that apply specifically to the Raspberry Pi 3 and not other/all models.

2
votes
1answer
46 views

RPi won't detect built-in BT adapter

My RPi 3 says no bluetooth adapter is detected and therefore won't let me connect to a device. The BT logo is greyed out instead of blue and running sudo systemctl status bluetooth it says the service ...
1
vote
1answer
133 views

How to compile project on Raspberry Pi, even when g++'s virtual memory exhausted despide big SWAP?

I want to build Iroha hyperledger on Raspberry Pi 3. So I've downloaded code and all dependencies and compiler gcc-8.2 (downloaded precompiled from here), then configured without tests: cmake -...
0
votes
1answer
35 views

Removing autostart program from .bashrc

Hello guys I made a really dumb mistake by adding a python script in .bashrc. I wanted to make this script autostart and followed a tutorial, where it said i should add it to .bashrc. Later on i read ...
0
votes
0answers
49 views

How to stop the NXP NFC-EXPLORE library from interfering with my i2c oled display?

I've been working on a new project with my raspberry pi 3b+ to turn in into a NFC jukebox/bluetooth speaker and I used the NXP EXPLORE-NFC header to take on the NFC scanning part. I've connected it ...
0
votes
0answers
57 views

Multiple raspberry pi's 3 synchronized image navigation

We have 7 raspberry pi's 3, each connected to the internet and an display. On each screen / raspberry pi is geeqie (image viewer_ running with an image slideshow. The goal is to have all raspberry pi'...
1
vote
1answer
46 views

raspberry pi compute module replication

I have a raspberry pi compute module with me and I have installed a number of programs into it. I have to reinstall the same programs on a number of such modules. Is there any way that I can create ...
-1
votes
2answers
104 views

Set date and time in raspberry pi from data in DD-MM-YYYY HH:MM:SS format [closed]

I have date and time input by user in the format DD-MM-YYYY HH:MM:SS. For example: 27-01-2019 12:47:00 PM IST Please help me how to set the date, time and time zone of raspberry pi from its command ...
0
votes
2answers
64 views

Why is my code not working between time hours?And what should be done if im using PIR sensor ,what is the change that should be done in this code [closed]

import RPi.GPIO as GPIO import time GPIO.setwarnings(False) GPIO.setmode(GPIO.BOARD) GPIO.setup(3,GPIO.OUT) #Define pin 3 as an output pin while True: if(time.hour(18)&&time.hour(5)) #...
0
votes
1answer
14 views

HAT Compatability RPI A,B and B+

I'm working through the HAT specification. The raspberry PI A and B have a 26 and GPIO headers, while B+ has 40 pin GPIO. https://github.com/raspberrypi/hats Am I correct to reason that if I design ...
0
votes
1answer
65 views

OpenCV install 'so' files not found cant insall via apt

Rasp 3 B+, Raspbian I installed OpenCV using pip3 install opencv-python Then tried to import cv2 which threw the error.. ImportError: libcblas.so.3: cannot open shared object file: No such file or ...
0
votes
0answers
29 views

raspberry pi and ltc 2873 cufd (RS 232 and RS 485)

I have a raspberry pi compute module 3 on an I/O board in which gpio 12 is contolling the mode in ltc 2873. If it is ground it will be working in the RS 232 mode. so if I have to write something into ...
0
votes
1answer
62 views

How to make a simple GUI?

I recently had follow this tutorial which basically is about making your raspberry pi send email notification every three seconds on the location of your device. The thing that is missing now is, I ...
0
votes
2answers
49 views

How do I make my raspberry pi invisible on a LAN?

How do I make my RaspberryPi running Raspbian invisible on my LAN? Or, if that's impossible, at least customize what information is given from it?
0
votes
1answer
111 views

FTP Server Installing on Pi 3 Debian Strench 9

I want make a FTP server. I don't want apache or PHP, just FTP. I tried VSFTPD, ProFTPD, PureFTPD and Samba but they were not work. Lastest I tried the ProFTPD but when i restart the ProFTPD service ...
0
votes
0answers
18 views

Web browser event-based triggering with MotionEye

I have installed motioneye on a raspberry pi in our office and opened portforwarding on my NAS so I can view it on Port: 80. Motion detection is active (editable mask). The web stream works perfectly ...
0
votes
0answers
37 views

Using single 5V relay (jqc-3ff-s-z) [duplicate]

Does anyone know the current requirement of the relay coil. It say 5mA to trigger however if it's in a on state vs an off state need to know the current draw.
0
votes
0answers
26 views

How to reduce latency between raspberry pi streamed video and android tablet using chrome

I have been using the pi to stream video to a tablet and it's been working fine up till now, but there's some really confusing symptoms happening in regards to streaming video from the pi to a tablet. ...
2
votes
2answers
109 views

RPi cluster or a dual Xeon

I have a text processing project that is currently Bash, GNU Parallel and other command-line tools. It's getting moved to a C++ queue type design. It is about 14,000 files each day, plus performing ...
0
votes
0answers
89 views

How to record video from two cameras simultaneously?

I connected two PS3 Eye cameras to my raspberry pi. Separately, cameras work fine. I can record the video in any supported resolution and frame rate. Unfortunately when I tried to record video from ...
0
votes
1answer
18 views

Reading out Button State while waiting

I have a small beginner question :D. I want to make the raspberry Pi sleep for 5 seconds and in this time i want him to check the status of a button and if the button is pressed he quits the waiting ...
1
vote
1answer
324 views

Switch between wifi client and access point without reboot

I want my Raspberry Pi to be used as access point or as client connected to my internet router but not both together. So I want to switch between these two modes with one simple command without ...
0
votes
2answers
129 views

Can't boot into desktop GUI

I have a Model 3 B+, and I used Etcher to flash Raspian onto a 32GB SD card. I can SSH in to use the terminal, but I can't boot into the GUI. I went into the config and adjusted the Boot Options to ...
0
votes
2answers
46 views

How to make a stand by button?

I am using an Raspberry Pi 3b and a 7 inch hdmi waveshare touchscreen that connects to rpi with a hdmi cable and a micro usb cable. I want to program a push button from GPIO pins to make the screen ...
1
vote
0answers
53 views

Any DS3231 RTC C++ experts here?

I'm trying to program a DS3231 using a translated C++ Arduino Mega 2560 library. Translated means all the Arduino I2C methods have been changed over to use the BCM2835 GPIO/SPI/[I2C] library. The RTC ...
0
votes
1answer
20 views

Cannot connect to wlan0 after setting the IP to static [duplicate]

Without setting the IP to static I can easily connect to Pi. The untouched ip is 192.168.1.135 and works great. How ever upon editing the /etc/dhcpcd.conf and adding interface wlan0 static ...
0
votes
1answer
27 views

Raspberry pi + L298 H bridge motor speed reduced when battery circuit shows 50%

I made a raspberry pi car. The pi is powered by two 18650 (Breewell New Multipurpose Flat Top 18650 Battery 2000 mAh 3.7 Volt Lithium Genuine Rechargeable Battery -Pack of 2 https://www.amazon.in/dp/...
1
vote
3answers
44 views

Editing Pi 3 System files on SD outside Linux?

Following the Tutorial - How to give your Raspberry Pi a Static IP Address my Pi 3+ doesn't appear on network. I have no HDMI display and I am trying to restore the original /etc/network/interfaces. ...
0
votes
1answer
218 views

Access point as a Wifi repeater for WPA2-Enterprise network

So this is a little bit of a random question but I'm attempting to follow this tutorial to set up a wifi repeater with my Raspberry Pi 3B+. I can get the Raspberry Pi to generate a network that can ...
1
vote
0answers
24 views

iptables doesn't recognise REDIRECT as target

Trying to redirect traffic using iptables v1.6 and the following line: iptables -t nat -A PREROUTING -p udp --dport 67 -j REDIRECT --to-port 6767 which results in the following output: iptables: ...
0
votes
0answers
31 views

Connecting Computer without Internet to raspberry with Ethernet and send Information via MQTT

I'm trying to connect a Pc without internet with a Ethernet Cable to my Raspberry and want to send informations from the Computer to the Raspberry via MQTT. I searched trough the internet but ...
1
vote
1answer
104 views

spi/mcp3008 trouble with getting a reading from chip, all channels read 0 (zero)

Pi model: Pi 3 A+ Os: Raspbian GNU/Linux 9 (stretch) <- it's stretch lite SPI: On Loop back test: spi mode: 0x0 bits per word: 8 max speed: 500000 Hz (500 KHz) TX | FF FF FF FF FF FF 40 00 00 ...
0
votes
1answer
38 views

raspivid doesn't include b-frames

I'm streaming raw h264 using raspivid on Raspberry Pi 3 and PiCam v1 . However, even I set the h264 profile to main or high, stream only contains I and P frames. Here is the command that I use for ...
0
votes
1answer
68 views

Connecting Raspberry Pi 3 with Huawei Surfstick 372

I tried to connect my Raspberry Pi with the Huawei Surfstick. All the tutorials i watched so far didn't helped me. If i plug in the Surfstick the raspberry shows that it is associated with it and has ...
0
votes
1answer
70 views

Retropie boots to 640x480 resolution over HDMI

I flashed the latest Retropie image (4.4) and it boots with a resolution of 640x480 when connected over HDMI to my 4k TV. I used the correct Retropie image for my Pi 3. I confirmed the screen ...
0
votes
0answers
32 views

Raspberry Pi to Raspberry Pi (Host to Host) IPSec Tunnel

I neeed to create an IPSec tunnel from RPi1 to RPi2 as described in the diagram below: RPi1-------WLan0------Router(No internet connectivity - only LAN)------WLan0 ------RPi2 A few days ago I posted ...
1
vote
0answers
110 views

Run Raspberry Pi 3 as VPN access point with pi-hole

I've got my Raspberry Pi with Raspbian running as pi-hole, connected through Wi-Fi to OpenVPN with most of my devices, where it blocks ads. I'd like to set RPI as VPN access point without ...
0
votes
1answer
29 views

Can i use 5v 3amp. in Raspberry Pi3 B+ [duplicate]

i am using Raspberry Pi3 B+ and i am in a confusion that can i use 5 volt, 3 ampare adaptor in my Pi?
0
votes
1answer
46 views

Raspberry Pi 3 Prototyping Breadboard HAT

How do I get the pin connect on the board. I see how to plug it on top of my raspberry pi through the female pin connected that is attached to the hat. But how do I connect the raspberry pins to the ...
0
votes
0answers
12 views

Multiple delayed output from pi camera

I’m trying to create up to 4 delayed outputs from the pi camera. The length of the delay needs to be varied 15-60 seconds. Is there a way to buffer the cameras feed and use the same buffer for all the ...
0
votes
1answer
175 views

Is there a good simulator for Raspberry Pi

Sorry to ask this kind of question. Is there any good simulator for Raspberry Pi? because I need to learn more about the raspberry pi but my problem that I can't buy all the sensors such as ...
0
votes
1answer
167 views

switch raspberry pi from client mode to access point mode without rebooting

i use this https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md tutorial to turn raspberry pi3 to an access point and also i write a script to hide the ssid and another ...
0
votes
0answers
19 views

RPi 3 can't find Windows PC hotspot

I am studying abroad for a month and need to be able to ssh into my pi. The hotel's WiFi won't allow my PC to ssh over their network, so I am trying to turn my laptop into a hotspot and connect the pi ...
1
vote
2answers
18 views

Fix boot to console from boot to desktop

I accidentally set it to boot to desktop (gui) instead of boot to console while fiddling with the settings. I don't have a gui installed. Now I cant access the pi over ssh to revert the settings on ...
0
votes
0answers
39 views

Thermal imaging

I was wondering if anyone knows of a thermal imaging app for either iOS or android, just purchased an p3 b+ and just trying to get a few things clarified befor I start her up, also any info on a ...
0
votes
1answer
39 views

Cluster as individual Pi's

I have built a Pi cluster (4 boards) rather than using them as a "super computer" can I use the cluster as four individual boards? e.g. one as an Internet Dropout, one as a mail server, etc? Thanks ...
1
vote
1answer
36 views

My rotary encoder is missing pulses - what are some potential solutions?

I have a rotary encoder with a very high resolution (5000 pulses per rotation). I used what I believe to be a fairly optimized rotary pulse counter program written in C found here but the faster I ...
1
vote
3answers
84 views

How to choose a suitable display for pi 3 B+?

I'm currently looking for a display 5 inches or less for my PI, but there are a lot of information and since I'm quite new to the world of raspberry I'm looking for some help and guidance on where ...
0
votes
0answers
37 views

Cloned Raspi Zero W boots into Emergency Mode

I have a Raspi (3+) that for whatever reason I need to clone to use as a temporary backup for downtime later on. After realising the effort needed to recreate it from scratch, I cloned its entire SD ...
1
vote
1answer
41 views

Rapidly-fluctuating output when using rotary encoders with Raspberry Pi + Processing

I'm using a Raspberry Pi 3 with some Cylewet KY-040 rotary encoders that I bought from Amazon to set up an art installation with Processing 3. Pi is just running the stock Raspbian NOOBS. Right now, ...
0
votes
0answers
30 views

Just started with raspberry pi. Any help about where to start? [duplicate]

I just got two Raspberry pi's working today, (I installed raspian), and I really don't know where to learn. I bought a few books, but they only suggest projects, and not how to use the pi. Any help?