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Questions tagged [pi-3]

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

0
votes
1answer
26 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
76 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
36 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
31 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?
0
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0answers
57 views

The AM2302 Temp/Humidity Sensor return none value in Raspberry Pi 3 B+

I am using the AM2302 Temp/Humidity Sensor. I start with sudo apt-get update && sudo apt-get -y install git python-dev git clone https://github.com/adafruit/Adafruit_Python_DHT.git cd ...
0
votes
1answer
71 views

trying to run 6 USB cameras simultaneously on a single Raspberry Pi 3B+ with add-on 4 port USB hub with external power

We are trying to simultaneously run 6 cameras on a Raspberry Pi 3B+ with an add-on 4 port USB hub that has an external power supply. The cameras are set at 15 FPS with a colour image size of 640 X 480....
0
votes
0answers
30 views

Raspberry Pi Green LED Always On

I was not able to find out why this error happens (repeatedly), please help me diagnose it. I have a Raspberry Pi 3 Model B, running Raspbian Stretch Lite (2018-11-13). It boots successfully. I can ...
0
votes
0answers
34 views

Cannot install install tensor flow on raspberry pi 3b

i am running into an error when i try to install tensor flow using pip on my raspberry pi 3b+. here is the error message: Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/...
0
votes
2answers
61 views

How to make a button toggle a led?

I have some code which turns an led on when I hold the button. But only when I am pressing it. Could somebody help me so when I press the button then the light stays on and if I press it again the led ...
0
votes
0answers
19 views

Pi3 won't boot Assertion 'str' failed at ../src/basic/utf8.c:195

I have an raspberry pI 3 that won't boot. The problem is probably the sd card since it works when I switch to another sd. During the boot screen the PI give me "Assertion 'str' failed at ../src/...
0
votes
2answers
39 views

Weird resolution

So, im new to the raspberry pi. When i first started it and installed the raspian os with noobs, it had fine resolution. But then i rebooted, and for some reason the noobs menu was in alright ...
0
votes
1answer
22 views

Need help blinking a led continuously?

I'm new to Python and just go this Raspberry Pi, and need help blinking this led. I have got it to where the LED will blink once( Turn on for a second, then turn off). I need some help so when I hit ...
0
votes
1answer
30 views

Ripped off display connector, raspberry not working anymore?

i am using a Raspi 3b v1.2. I ripped parts of my display connector off by accident and then removed the whole thing with pliers, because i will never use it anyways. Now my raspberry won't boot. Is a ...
0
votes
2answers
42 views

Is this Solenoid Connection Correct?

I'm new to this Raspberry Pi. I'm trying to build this project: https://www.hackster.io/hitherejoe/braillebox-braille-news-reader-e86060 But the circuit diagram in it: https://hackster.imgix.net/...
0
votes
0answers
70 views

installing openvpn on raspberry pi3

i try to create a free vpn client of raspberry pi 3 to hide my ip address when i connect to the internet.to do that i install an openvpn from vpnbook.com on my rasbian stretch OS. this is what i do: ...
0
votes
0answers
30 views

Disconnect RTC from systemd-timesyncd.service

I have an RPI3 with an added external RTC (Adafruit PiRTC - PCF8523). My system does not have consistent access to the internet, occasionally loses power, and is remote (in the field), so physical ...
1
vote
0answers
19 views

Setting up paging in raspberry pi 3 model B in 32 bit mode

I am trying to setup paging in rpi 3b in 32 bit mode. First of all I am aiming for identity mapping all kernel code, so I started with short descriptor format using 1 MB sections. Identity mapping ...
1
vote
1answer
42 views

How to start a systemd service as a non-root user?

I've been using qbittorrent-nox on a headless Raspberry Pi 3 B+. The setup was a breeze. But then I wanted to autostart qbittorrent after boot, so I wrote a systemd service unit and enabled it. It ...
3
votes
1answer
46 views

How can I install Mosquitto on a Raspberry Pi 3?

I have a Raspberry Pi 3 and I am struggling with installing Mosquitto. It seems to be caused by a bad mosquitto-jessie.list file: deb https://repo.mosquitto.org/debian jessie main It could not ...
0
votes
1answer
38 views

random reading by analog inputs of mcp3008

i ran the simpletest.py program for testing the mcp3008 and it is returning random values with 0 value at intervals to the pins left open and also to the pin getting input from MQ-9 sensor... can ...
0
votes
0answers
24 views

Raspberry pi randomly disconnects my wlan0 but keeps working through eth0 and even wlan1

I have a raspberry pi 3 which will randomly disconnect from my wifi network. If I do ifconfig I can see that wlan0 has no IP address anymore. However, eth0 still has and my wifi dongle in wlan1 also ...
2
votes
1answer
34 views

Raspberry GPIO button sysfs

I am trying to connect a button to my raspberry pi 3 (model B). I want to do it via the sysfs approach. Here is a picture or my small circuit: It cannot be simpler: the black wire is connected to a ...
0
votes
0answers
58 views

Getting low FPS while using x11grab ffmpeg

Question : Why I am getting ~7 FPS even I have specified 30 ? I am using raspberry pi 3 and compiled latest soruce code from the GIT and still getting low fps(~7) while using below ffmpeg command ...
-1
votes
2answers
88 views

how to build simple interface for Gps project using neo-6m gps module

Hello, you may have heard this like thousand times. So i'm new to raspberry pi. And i just recently bought a raspberry pi 3 for my final year project. I bought this module also which is neo-6m GPS ...
0
votes
1answer
43 views

GPIO causes random input on room light switch / EMP?

I am building a simple application with a switch on the rasperry pi 3 b+. I have connected GPIO pin 18/32 through a 56k resistor to 3.3v (tried pin 1 and 17) to have it pulled up. The switch closes ...
0
votes
2answers
37 views

very odd problem - installation split over two usb drives

I installed raspian 3 on my new pi3b+ and something went weirdly wrong - twice. I used an 8GB micro in the micro usb bay on the pi3 and loaded the installation files on an 8GB Sandisk Cruzer memory ...
0
votes
0answers
16 views

Are There any MFRC522 Compatible Libraries for AndroidThings?

I am building a program that reads and writes to RFID tags. Are there any libraries that let me read and write to RFID tags? I have checked Galarzaa90's RC522 library, but I don't think RFID tags can ...
0
votes
0answers
47 views

Raspberry Pi 3 & L298N - Motor not turning

I bought two DROK L298 H-Bridges to control my DC motor (one for backup). I've connected it up to my Raspberry Pi 3 with BCM 12 as my PWM and 16 and 19 as my IN1 and IN2. Below is my code to test if ...
1
vote
0answers
76 views

Display slideshow of Images and Videos over SSH

Device: 3 B Plus I am trying to create a slideshow of videos / images. The user can select which files he wants to put in the slideshow and this will be shown on a TV. (As an addition, I would also ...
1
vote
0answers
43 views

Will 'release-upgrade' to 18.04.1 LTS Server on Raspberry Pi 3B provide a 64bit Kernel

I have Ubuntu 16.04.5 LTS Server (for armvhf) installed on my Raspberry Pi 3B (ARMv8), which runs a 32bit kernel. I would like to install a 64bit kernel and associated modules with minimal fuss as I ...
1
vote
3answers
73 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 ...
0
votes
1answer
87 views

Disable SSH Password Warning

How I can disable the SSH warning after a restart? I tried to remove the etc/profile.d/sshpwd.sh file and some other methods but they don't work. I have a Pi 3, using Raspbian Stretch with the ...
0
votes
0answers
25 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 ...
0
votes
0answers
18 views

How to make buletooth beacon for android

I have tried to make a bluetooth beacon using Raspberry pi 3's inbuilt bluetooth module. I have followed this tutorial and this rpi_so thread. But I can not get any beacon signal from them to my ...
6
votes
2answers
125 views

How can heating problem be solved in RPI3 that is being used in a machine that works 24/7?

I have made a medical vending machine for my college project which can be used in remote areas to provide them with the basic medicines to help them deal with curable diseases and providing them the ...
0
votes
0answers
54 views

problem connecting with port serial0 for serial comm

I am facing this issue that I can't solve, I've been on this like 3 days and it is really frustrating! I'm trying to test AT commands through port serial0, I've tried it in a python file and when i ...
1
vote
1answer
249 views

(Error trying to run qjackctl) libEGL warning: DRI2: failed to authenticate qt5ct: using qt5ct plugin

Running Raspbian installed with NOOBS. qjackctl is installed with all its dependencies using Synaptic. Just trying to run Guitarix on my Pi3 B+. I tried following the instructions in this solution, ...
1
vote
1answer
52 views

Raspbian Stuck on Boot Info

I am new to the Raspberry Pi, so sorry if I am missing something obvious here. I was about to install something, so I typed in sudo apt-get update, sudo-apt get upgrade and then sudo reboot. While it ...
1
vote
0answers
24 views

How to read UART port data via Ethernet Raspberry 3

I am using a Raspbee device with raspberry pi 3. The rasbee is attached to the UART ports of the Pi 3 as shown in attached figure. The communication between raspbee and pi3 is done through UART ports....
0
votes
1answer
40 views

In raspberrypi 3v3 pin output is not providing power

i am working with raspberry pi suddenly my terminal got stuck and after i dis-connect my raspberrypi and again connect it ;but it not detect my raspberrypi sd card and i found that 3v3 pin is not ...
2
votes
1answer
41 views

Raspberry Pi: Unable to access or ping after reconnecting any device to the local network

I have a raspberry pi that is connected to the network with DHCP. When I start it, I can ping it and connect to ssh through wifi. The issue is when I diconnect the device that I am using (my pc/...
3
votes
2answers
79 views

Couldn't get Composite Video Output on Raspberry Pi 3B

I am trying to get composite video output from my raspberry pi to feed into my old CRT TV. I tried multiple times but without success. I bought an 4 pole 3.5mm RCA cable which was not according to the ...
-6
votes
1answer
44 views

Issues with PI and faster VC4 alternatives [closed]

I am aware that there has been alot of questions about using dedicated Nvidia or AMD GPUs with the Pi (I have asked a few of them). But ARM (mali core ) and Vivante among other companies appear to ...
0
votes
1answer
211 views

OSError: [Errno 121] Remote I/O error or pigpio.error: 'I2C read failed' on MPU6050

So I use MPU6050 to get acceleration from stepper motor linear rail movement(steper motor working in thread, I use pigpio for the motor) by make the MPU6050 can work on threading and it can show data ...
0
votes
1answer
416 views

run vlc in command line

So I have a Raspberry Pi 3+ running OctoPrint. I also have an HDMI IP camera attached to my 3D printer. Because the stream for the camera is not compatible, I have another server running the VLC ...
3
votes
1answer
222 views

What are the functions of the test pads on the Pi 3B/3B+?

The various models of the Raspberry Pi comprise numerous test pads (testing pins). Many of these pads however are not mentioned or properly labelled in the official reduced schematics the Raspberry Pi ...
0
votes
3answers
61 views

Relay board failing when connected to RPi3 5V pins

I'm using my pi to power several relays. A total of ~20 relays (a 8-relay board and three 4-relay boards) I'm also running home-assistant Yesterday i noticed that when i try to power them all up, ...
2
votes
1answer
45 views

ntp doesn't work in raspberry pi

the problem is my raspberry pi 3 doesn't show the correct date and time.i edit this file: sudo nano /etc/ntp.conf with correct server addresses and i try this commands : sudo /etc/init.d/ntp stop ...
2
votes
0answers
30 views

ADXL345. Bits, resolution and g's

I have a Kistler type 8921 which produces 1g (10m/s2) RMS (at 159 Hz). The ADXL345/Raspberry Pi 3 setup should produce similar g's, but currently doesn't. As can be seen, it is not just about a ...