Questions tagged [pi-3]

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

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1answer
239 views

How do I fix this broken upgrade?

I run sudo apt update and sudo apt upgrade every month on my pi. A couple weeks back this occurred during the upgrade part. > pi@ngpi:/var/log $ sudo apt upgrade Reading package lists... Done > ...
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1answer
53 views

How to implement serial event detection for request /response operation with Tkinter

I am working an application where I read two sensor values in every 200ms and show values in Tkinter window . My issue is in my application I have to response request from master PC through serial ...
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1answer
28 views

How can I work on a pre-existing raspberry pi/sd card on my computer without re-writing over the card?

I was given a raspberry pi 3 B vol. 2 that uses sonic pi to control a walk-on piano and am trying to work on the code contained on the micro sd card, but when I try to open it for the first time ...
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0answers
20 views

Program stops running while accessing MongoDB in python program triggered using udev rules

I have udev rules file to run a program on usb mount. I am running a bash script automount.sh when USB is connected to Pi. #! /bin/sh cd cd /root chmod 777 /media/USB chmod 777 create_report.py ...
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0answers
32 views

Need help in connections and code of a gsm module to trigger a call with a raspberry pi 3

Hello so i need the code and connections for a gsm module triggering a call i have searched like ton of sites and youtube and found no help if you could help me and explain the code and connections ...
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1answer
42 views

Raspberry PI 3B: Problem connecting to SSID

I am using raspberry pi 3B with Jessie OS. I connect it to wifi by changing the network setting inside the /etc/network/interfaces the file. The setting looks like something like: source-directory /...
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1answer
32 views

Connection between nodemcu and raspberry in different networks

You can send measured data from a sensor connected to the NodeMCU to the Raspberry, only I don't want a physical connection, I want to connect via another wifi. Example, Raspberry is at my house and ...
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0answers
40 views

Raspberry Pi 3 b+ not booting

I've raspberry Pi 3 b+ which is 2 years old since I purchased it. Recently it has started behaving very strangely. I've installed new rated power supply (5V 2A) for pi board. The board runs fines for ...
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1answer
30 views

Raspberry Pi 3 OpenCV Compilation Error at 34%

I am trying to install OpenCV-3.1.0. I am following this tutorial: https://www.pyimagesearch.com/2015/10/26/how-to-install-opencv-3-on-raspbian-jessie/ I was on Step #4: Compile and install OpenCV ...
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0answers
39 views

How to force default audio output to the relevant card/device?

This is for Raspberry Pi 3B, installed with the full 2.5GB version of the latest Raspberry Pi OS downloaded in October 2020. On being unable to play audio via a 2.1W USB speaker with a 3.5mm jack, I ...
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1answer
27 views

raspberry pi 3 model B+ acting weird during startup

So I found my old pi while cleaning, I flashed a fresh copy of raspbian on the SD, booted up the pi but for some reason it is exhibiting a weird behavior. Not as experienced with these so i am not too ...
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2answers
167 views

WiFi shows “unavailable” on Raspberry Pi 3 Model B / Fedora 32

I'm trying to use Fedora Server 32 on my Raspberry Pi 3 Model B, using the procedure documented here. Everything goes pretty well, up until the point where I have the system set up and I try to ...
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0answers
42 views

raspberry pi4 mini uart (uart1) not working in barebone code

I'm trying to get the mini UART in a Raspberry Pi 4 (8GB) working. I used the example baremetal kernel from mini uart example and changed the MMIO base in gpio.h to 0xFE000000 for the RPi4. But when I ...
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3answers
167 views

apt update results in hash sum mismatch

Please see the error that I get every time when I try to apt update below. I use a Raspberry Pi 3 Model B. I did a lot of research and tried a lot of things to solve that issue: -Changed the /etc/apt/...
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0answers
40 views

Is the low voltage danger only during boot or during operation too?

I went to an authorized reseller, but they gave me this charger for my Raspberry Pi 3B. I used Etcher to write the August 2020 version of RPi OS to the SD card and it boots fine. However, during boot ...
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2answers
31 views

UART and AP Question [closed]

I have a wifi access point that I need to connect to via UART/SERIAL as the console rj45 is broken. I have a USB UART cable on the way but it’s going to take a while to get here. Is there any way I ...
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0answers
87 views

OpenOCD samd51 SWD programming

I have hooked up my pi to a SAMD51 regarding this guide. I have also powered the samd51 according to the datasheet which can be found here. When I enter sudo openocd, it only shows me this: Open On-...
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0answers
31 views

glGenerateMipmap crashes on Raspberry Pi 3

I'm testing a C++ program made with GLFW and it crashes with a segmentation fault on Pi 3 but not on Pi 4. The reason of the crash is the call to glGenerateMipmap(GL_TEXTURE_2D). Systems tested: ...
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0answers
36 views

32 bits data transfer from Pi to FPGA using spidev

I'm trying to 32 bits data send and receive between Pi and FPGA using spi. So, I set the Pi as master and FPGA as slave. And use xfer2 function from spidev. But, I couldn't read data. How can I fix it?...
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0answers
26 views

Smartmirror: i2cdetect and voltage

I build my first smartmirror and I have two issues. First of all this is my setup: RASPBERRY PI 3 Model B LG-Philips LP173WF1 (TL)(B2) 17,3" LED Display Screen (non-glossy) Full HD Hdmi ...
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0answers
25 views

Multiple camera modules for analyzing objects up close

I want to build a system where there are 3 cameras connected to the Pi (v3), for up close image processing, the quality isn't necessary, as long it can detect small objects (~0.5cm wide to ~8cm long) ...
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2answers
143 views

Raspberry Pi as Access Point with hostapd crashes Pi whenever I try to connect

I followed this tutorial to setup my Raspberry Pi 3 B+ as a wireless access point. I have gotten to the point where the Pi broadcasts an SSID, but as soon as a client tries to connect to that SSID, my ...
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1answer
119 views

connect raspberry pi to fax machine

I want to connect raspberry to fax machine , because I want cypher message before transmit via landline phone . how can do it , how can interface between rasp and fax machine ?
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0answers
82 views

Wifi grayed out for secure networks

I have a Raspberry Pi3 Model B. I was using it with wired internet and it worked well. But now, due to a move, I can't use a wired network anymore. I would like to use the university's secure wifi. ...
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1answer
30 views

Measure FPS of Application in console mode

I am comparing two applications and therefore need to know which fps a raspberry can produce when you run it. I am looking for a method to do this. It does not matter if it is an overlay or a simple ...
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1answer
36 views

Arduino to Pi reads high all the time [closed]

I'm trying to read a signal coming from an Arduino through a wire attached to pin 24 of the Pi. The problem is the Pi reads high all the time. I tried to do a pull up using GPIO.setup(24,GPIO.IN, ...
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0answers
74 views

connecting bluetooth audio sink to PiFmAdv

I have a raspberry pi configured as a bluetooth audio sink using this post: Another How to turn your Pi in a Bluetooth Speaker Tutorial. Which uses pulseaudio. I also have the PiFmAdv configured and ...
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0answers
12 views

Setting up Waveshare JetRacer program, error when configuring CMake

For setting up JetRacer the following commands I use are: cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D INSTALL_PYTHON_EXAMPLES=ON -D INSTALL_C_EXAMPLES=OFF -D ...
1
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1answer
36 views

Pushbutton -> print message and shutdown. Prints message only the first time

I wrote a small script to shutdown the pi once the button is pressed for 2 seconds. It should print a message and after one second shutdown the pi. I also have this script to run automatically on each ...
0
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1answer
46 views

How should I power multiple RPi 3 units from a beefy power supply? [closed]

I have to power 20 Raspberry Pi 3 units from a few 5V 10A power DC power supplies. I have little experience in electronics. The RPis can be up to 1.5m apart from one another. A friend of mine ...
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0answers
123 views

My Raspberry Pi 3 B Cant Connect To My New Wifi Router

I Just got a new NETGEAR RAX80 Nighthawk Router and my Raspberry Pi 3 B (not plus) running retropie won't connect to my wifi. I've tried: Making sure my SSID has no underscores. Connecting it to LAN ...
1
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1answer
183 views

How to run all node.js on startup

I want to run all node.js scripts in some folder on startup (in perfect case, running some npm script (I think the thing i run by npm run someScript by this) in all folders in some specific folder). ...
1
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3answers
165 views

How Can Rpi Interface The I2C Nintendo NES Game Controller with WII Remote?

so I bought this NES controller thinking I would be dealing with a 5-pin shift register but found that it was connected to a WIImote connector that appears to use I2C. I am trying to read its output ...
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0answers
37 views

Raspberry Pi Black Screen

I just got a new raspberry pi 4 model B. I used it twice and it was working perfectly fine. But on the third time, when I tried to turn it one, I have the rainbow screen then the screen which says &...
0
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1answer
39 views

Jon Eskdale's Touchscreen dimmer

I have the official 7" touchscreen installed on a Pi 3B running Strech V9. I have installed the touchscreen-dimmer project from the Github repository & followed the readme.me the screen dims ...
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2answers
60 views

Copy text file from my raspberry pi to windows pc over ssh

I am using raspberry pi model 3b boards for my project. These boards are acting as BLE rssi scanners and are storing the rssi data in a text file (saved on desktop). Now, in order to analyze that data,...
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4answers
63 views

power troubleshooting

I am trying to power a raspberry pi 3 over a long distance (5 meters). I can power the raspberry pi with the standard power supply from Raspberry Pi itself, but when I use these: https://www.digikey....
0
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1answer
224 views

Cannon Printer in CUPS rastertoufr2 failed

I've installed an Rasperry Pi with a standard Rasbian image. Now I want to use my printer with cups (Cannon MF3010 - connected via USB). I've installed ppd file in cups and place the filter file under ...
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0answers
83 views

Raspberry Pi 3, Wifi Extender, “Could not set interface wlan1 flags (DOWN): Operation not permitted”

I'm attempting to create a wifi extender out of my Raspberry Pi 3 using this guide: https://pimylifeup.com/raspberry-pi-wifi-extender/ After some troubleshooting, I made it all the way through the ...
0
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1answer
123 views

NetworkManager on Ubuntu Mate keeps asking the password

We recently changed the router and set up the devices and everything worked fine. Except there is my raspberry pi 3 which cannot connect to the new router. It doesn’t show any errors but it simply ...
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0answers
17 views

Hostapd won't serve wlan0 when connecting a 2nd phone

I'm using a raspberry Pi ARMv7 Processor rev 4 (v7l) for serving as a wlan access point from my LAN. I've been following the official documentation access-point-routed.md I set the local to CH and ...
0
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0answers
29 views

hostapd: Pi 3 built-in WiFi going up and down every second

I am using a Pi 3 Model B running Raspbian buster and kernel version 4.19.118-v7+. I have been trying to configure it to run as a WiFi repeater using the built-in WiFi (wlan0) which is configured to ...
0
votes
1answer
23 views

Audio cuts out periodically when using audio hat

I am currently live streaming some audio to and from a raspberry Pi Zero W using the waveshare audio hat however I have found that the audio periodically cuts out when I do this. When I used my logic ...
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0answers
87 views

How to install MongoDB on Ubuntu Mate 20.04 running on pi 3?

I have an instance of Ubuntu Mate 20.04 running on my Raspberry Pi 3 and I am wondering if it is possible to install MongoDB 4.2 without compiling it. I am not sure where I can get the builds from. ...
1
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0answers
49 views

Receive and send bluetooth audio to bluetooth device from Raspberry Pi 3

I have the Raspberry Pi 3 with the latest version of Raspbian Buster and I am looking for a way to have the RPi to receive Bluetooth Audio from a phone or laptop and output the audio to a bluetooth ...
2
votes
1answer
88 views

Interfacing Micron Serial NOR Flash Memory

I want to communicate with Digilent Pmod SF3 which contains Micron N25Q256A NOR Flash memory. I did all the wiring setup between Raspberry Pi and Pmod board as shown below: Pmod RPi ==== === ...
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4answers
86 views

Battery Solution for Raspberry Pi 3b

I am working on a project for which I need to attach the four raspberry pi boards on the ceiling of the room (one at each corner). The script that will run constantly scans the BD Address and the RSSI ...
0
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3answers
135 views

Raspberry Pi 3 high IO

my Raspberry Pi 3 is currently suffering from a very high IOWait. Running iotop gives me the following: It's listing some perl process but I have no idea what it is or why it's using 99% IO. Any help ...
1
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0answers
66 views

PIR sensor always high with Raspberry Pi3 without breadboard

I have a HCSR501 PIR motion sensor, which has 3 pins (Vcc, Out, Gnd) that I've connected to 5V, GPIO 26, and Gnd respectively. Despite following all the steps in tutorials for interfacing the sensor, ...
1
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1answer
77 views

Delay/Lag when controlling motors with arduino from raspberry pi

I'm making a car-type-thingy where I control motors connected to an arduino with a raspberry pi via serial communication. I'm using the adafruit motor shield to control the motors. I want to control ...

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