Questions tagged [pi-3]

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

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9 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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18 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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29 views

How to profile the code/ instructions to calculate the cycles on Raspberry pi [closed]

I am new to Raspberry PI. I compiled my code on Raspberry PI 3 board using simple make file. I want to profile my code on Raspberry PI 3 board. Can anyone help me in writing instructions to calculate ...
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2answers
20 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
19 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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39 views

How to start a Rpi Robotics Project Using Cheap Motors? [closed]

I am about to start a raspberry pi robotics project and am looking into what motors to use, I was wondering if there are any good motors anyone would recommend. Then robot will be pretty small and ...
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0answers
63 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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27 views

TCP Communication Between Two RPi [closed]

I'm trying to send a 120-byte message from one RPi to another (both Pi-3). The first RPi receives the data over serial from three Arduinos and then does some processing. It has a touchscreen GUI where ...
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1answer
18 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
35 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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30 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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11 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 ...
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1answer
16 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 ...
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1answer
43 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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66 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 ...
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1answer
53 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). ...
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3answers
69 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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35 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 &...
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1answer
25 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
44 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
54 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....
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1answer
75 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
26 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 ...
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0answers
25 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
14 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 ...
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0answers
18 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 ...
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1answer
17 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
31 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. ...
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0answers
39 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 ...
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1answer
35 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
76 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 ...
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3answers
67 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 ...
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0answers
35 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, ...
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0answers
46 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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1answer
118 views

Setup Wifi direct (wifi p2p) between dedicated pair of Raspberry Pi 3 B+ - One Group Owner, the other the client

What I would like to accomplish: A dedicated pair of RPi's using Wi-Fi Direct (p2p), one GO (group owner) the other its Client. The GO is not to be an Access Point as neither RPi needs to connect ...
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0answers
36 views

Using a port expander AND other GPIO pins

I'm working with a port expander for the pi to run four stepper motors from python. It was working great until I tried to also use a GPIO pin on the pi (not on the port expander) as an output. I was ...
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1answer
87 views

rpi nfc tag emulation

I am looking for a NFC device which can work with rpi (3B) and is able to emulate card. NFC devices are super confusing world. I tried several NFC devices with PN532 controller and all of them so far ...
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0answers
30 views

Monitor “No Signal” after the Raspbeprry Pi logo

I installed RPi OS successfully on my RPi3 Model B, after couple of minutes the screen goes black and says "no signal". I am using a VGA monitor with a HDMI/VGA connector. When I reboot my ...
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0answers
34 views

4B having issues with USB serial and booting with USB ports populated

first time OP'er here I have two issues which I do not know if they are related. Some quick background about my setup I have 4B 4GB pi. I have 3 USB2.0 webcams, the webcams have their cables spliced ...
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0answers
32 views

VGA output suddenly not working, Why?

I have been using my VGA monitor for my RPI3 Model B using a VGA to HDMI cable and it works perfectly fine, but today when i turned on my pi the monitor says "No signal" I thought that my ...
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1answer
60 views

problems lighting up LED on pi 3

HI i am new tp pi and python and wanted to create something that simply turns on and off a led. It does not seem to work and not sure why? here is the python script: from gpiozero import LED, ...
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1answer
50 views

Setting up Raspberry Pi as wireless access point with static IP config

I am trying to set up my raspberry pi to act as a router. The set up is the following: The Raspi receives its connection to the internet through Ethernet, with a static IP address setting. The subnet ...
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0answers
9 views

How to use the turtle graphics package on my Pi 3B

I have a built a car which uses distance sensor to navigate a room. I want to map out the room's diagram based on how the bot car moves. The turtle graphics package in Python translates commands like ...
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1answer
41 views

Can I plug my SD card from Pi 4 into a Pi 3?

Can I use my SD card from a Raspberry Pi 4 2GB in Raspberry Pi 3? If not, is there a way to get some python and node-red files from my SD card as my Raspberry Pi 4 kinda got fried?
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1answer
28 views

How to set relative configuration file for my name-password AP?

I would like to connect my RPi3 with wifi attached. I can scan all APs in my office using command "iwlist wlan0 scan". But I can't find IP address at response of ifconfig wlan0. I can connect to an AP ...
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1answer
76 views

How can I install Wi-Fi drivers from first boot on Raspberry Pi 3B?

I'm trying to configure my Raspberry Pi 3B and Raspberry Pi Zero so that I can modify cmdline.txt, and have it install the drivers for my TP-Link adapter from first boot automatically. My Pi has ...
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2answers
83 views

What is the location of my crontab or all crontabs?

I am a newbie to raspberry pi's so please forgive my lack of knowledge. A few years ago I was given a raspberry pi 3, I had it set up with a crontab file which ran some commands for me which have ...
1
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1answer
175 views

Rpi PIR Motion Sensor HC-SR501 always reads high, why? [closed]

I'm trying to use a motion sensor with the Raspberry Pi but despite all the tutorials I followed, the input of the raspberry pi is always high. Here is my code below. I used a LED to turn it on when ...
0
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1answer
122 views

How to install PHP 7.2?

The title says it all. I'm trying to install PHP7.2 on RPi 3 so I can install OwnCloud on it. When I run sudo apt-get install php7.2 -y I get Unable to locate package php7.2. Do I need to add a repo ...
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0answers
18 views

guizero stuck until serial input

I'm a newbie to Raspberry PI and guizero. I'm trying to change texts and set some menus visible using button and I have to print serial data on the screen. My problem is when I change text and hide ...

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