Questions tagged [pi-3]

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

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16 views

Docker-Compose won't install on Raspberry Pi 3

Most guides that I found to install Docker Compose on Raspbian resolve around an installation via pip, e.g. sudo pip3 install docker-compose Unfortunately, if I try that on my Raspberry Pi 3, it ...
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22 views

I cannot make 7Segment 4Digit TM1637 to work

I bought 7Segment 4 Digit TM1637 And i wan to make it work with Raspberry Pi 3B However, it doesn't work I think i wired everything correctly, and i used this python lib https://pypi.org/project/...
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1answer
22 views

Controlling 4 servo motors through hardware PWM

I am working on a some time-critical system that will run image processing and controlling 4 SG90 servo motors. In short, I will do visual-servoing. Since I will do visual servoing, I don't want to ...
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26 views

Which Model Do I Need? [closed]

I have a Raspberry Pi 3 Model B. Is it still considered suitable for streaming tv or do I need to get a Raspberry Pi 4?
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22 views

Read binary data from serial port and save in file

I am link modem to pi3 via serial port and configure this port . When i receive data in my python software from serial port and save bytes in file, i note i receive too mutch data , I am receiving ...
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13 views

WiFi Transfer of Data from RPi to Smartphone without Internet

I need some help. Is it possible to transfer data from a RPi +3B, using WiFi to an Android or iOS smartphone? There would have to be a two way communication between smartphone and RPi. There is no ...
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9 views

Can Raspberry pi log more PCB 353b33 accelerometer data points compared to TDS3014B oscilloscope?

I'm currently recording data points from an analog accelerometer(PCB 353b33) using a TDS3014B oscilloscope which has Record Length of 10,000 points at a Sample Rate 1.25 Ga/s. I'm want to record more ...
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1answer
21 views

Send data to mosquitto installed on raspberry

I'm really new here and I have a question about the raspberry pi 3b+. I developed a little IoT application. Basically I read values from a sensor and then send them on my broker topic via mosquitto. ...
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9 views

SMART MIRROR RASBERRY PI set up

HI so im new to this and i dont understand most of the terms u are talking about. i have a rasberry pi 3 and a vga monitor(with the covertor) and an hdmi cable. i load the software on my 16gb sdcard , ...
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27 views

pySerial - UART - Determining when a message has actually been sent (callbacks?) (RTS/CTS hacking?)

For reasons (explained at the end of the post) I need to have a pin change state immediately as the UART finishes outputting a set of bytes. I'm using pyserial & pigpiod on a RPi3B+ and bluetooth ...
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1answer
19 views

How is the circuit getting power

In the pic, I have connected GPIO 17 to resistor, which connects to an led which connects to the ground. The rasberry pi is connected to the board via the ribbon. I have not explicitly connected the ...
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26 views

How can I dim my 7" LCD touchscreen display using Raspberry OS?

I have a 7" TFT LCD and I am building my own car head unit but obviously it is vital that it can dim. There are dim buttons on the board and an on/off screen button. I have tried using: echo n &...
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44 views

Geckodriver on Raspberry Pi?

I'm trying to use selenium on a website with the Raspberry Pi. Doesn't seem too hard. Ok, let's get started! Wait, last time I needed Geckodriver. https://github.com/mozilla/geckodriver/releases ...
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27 views

How to integrate a MQTT broker into Linux based raspbian kernel source code and cross compile in Ubuntu 20.04.2?

I’m trying to integrate a MQTT broker into Linux based raspbian kernel source code, which I cloned from https://github.com/raspberrypi/linux/tree/rpi-5.4.y. I need to integrate the mqtt broker and ...
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2answers
34 views

How voltage tolerant is the RPi 3 A+ micro-B USB power connection? [duplicate]

I've been reading about power supply requirements for RPi and want to learn more about the practical limits in addition to the design limits. What is the power protection circuit (if any) on the micro-...
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1answer
18 views

What is the relationship between angles and pulse length of servo motor?

I've been working on a project where I've to drive the servo motors. I am using Raspberry Pi 3B+ model and Adafruit PCA9685 to drive the servos. For that I need to find which angle is at what pulse ...
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26 views

Booting up my Raspberry

I am working on a laptop and I did all the steps on the raspberry pi website for my raspberry pi 3. I plugged everything in raspberry pi and it has red flash.
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28 views

How to turn camera into ONVIF IP Device?

I am new to Raspberry Pi and also new to ONVIF. I can you turn a raspberry pi camera into ONVIF compatible IP camera and also add different profiles and edit the features in the profiles. I don't know ...
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47 views

AttributeError: 'NoneType' object has no attribute 'send' for my LED on off code through blynk

I am trying to run a cod for LED on and off through blynk app but every thime it is showing this error: AttributeError: 'NoneType' object has no attribute 'send' my code is import RPi.GPIO as GPIO ...
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15 views

Issue with read Xbee Data

Here, I am interfacing Xbee(Rx) with raspberry pi 3 (Model B) and on another end Xbee(Tx) with Arduino UNO. On the Tx side I have a mechanical tool which is sending two types of data. But I am not ...
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18 views

Set up wifi on raspberry similar to google mini

I'm looking for a way to send my raspberry to a colleague and easily have him connect to it to his local wifi headless. I read about writing a wpa_supplicant.conf file for a particular wireless ...
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1answer
69 views

`No module named 'numpy'` after `apt install python3-numpy`

I want to use the python package 'numpy'. After a bit of research, I found that using apt install python3-numpy seems to be the recommended way of installing it on the raspberry pi 3 (within a docker ...
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41 views

QT Creator - Raspberry Pi - 3.5" TFT - Could not initialize egl display

Please forgive my ignorance but I'm new to Raspberry Pi/Linux. I'm trying to make a touch screen app for the Pi using a 3.5" touch screen (xpt2046) and QT Creator (5.12.5). QT Creator is running ...
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1answer
37 views

Are the ARM Mailbox and Doorbell interrupts ever triggered?

I'm writing some very bare metal multi-tasking code that manipulates the hardware on a Pi3. Part of that is to initialise a frame buffer, and I'd like to avoid polling loops, where possible. (e.g. ...
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24 views

I can't get my raspberry pi to download the library files for Pixyusb2

So I'm trying to get a pixy camera to connect to my pi for a school project, and whenever I run this code sudo apt-get install git libusb-1.0-0-dev g++ build-essential I get this message Reading ...
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41 views

What is ConnectionError Failed to establish a new connection: [Errno -2]?

I am running a 6 script and they are running at different timings using systemd service and timer. Each script access the same url at least once. When I check the log file of some scripts, they are ...
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24 views

write and receive image to embedded modem via txd rxd in raspberry pi 3

How can I send and receive image (page) to embedded modem via Txd Rxd in raspberry pi3 using python ? And how can configure buadrate and flow control using Cts Rts?
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1answer
49 views

Why is gpioinfo not showing me pin names?

I'm running the same image on 2 different Pis: 2020-08-20-raspios-buster-armhf-lite.img. Kernel 5.4.51-v7+. One Pi is Pi3, and the other is Pi4. On both, I installed gpiod, and ran: $ sudo gpioinfo ...
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1answer
30 views

How to enable console via uart1 in yocto for raspberrypi3 image

I'm using Yocto-dunfell for getting custom my Raspberrypi3 image. Here I want to enable serial-console via uart1. for that I have given change in my files- local.conf: ENABLE_UART = "1" ...
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21 views

my pi changes its MAC adress after working with openVPN

I have installed OpenVPN on my raspberry pi 3 and launched an openvpn client so I can access it from anywhere. That worked really fine but I have noticed that after each reboot of my raspberry pi it ...
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1answer
110 views

Self Hosting Raspberry Pi for Discord Bot [closed]

I've sucessfully set up my Raspberry Pi to host my Discord Bot, from these instructions (albeit a bit outdated), but from what I know, I had to connect a monitor and keyboard to start the raspberry pi ...
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55 views

How to solve Raspberry Pi 3B & Bme280 Remote I/O error

Let me start off with the components used: GPIO extension board to connect the raspberry pi to components Bme280 (Purple thingy) Pi 3B Problem description: This problem was intermittent at first. We ...
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2answers
44 views

RPi 3 B+, set defaults for GPIO pins on boot and shutdown

I am using Raspberry Pi 3 B+ with Linux raspberrypi 5.4.83-v7+ #1379 SMP Mon Dec 14 13:08:57 GMT 2020 armv7l GNU/Linux to control a set of relays. I set: gpio mode 7 output gpio mode 0 output gpio ...
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1answer
41 views

Raspberry Pi 3 Wifi Adapter Problems

I have a Raspberry Pi 3, model B+. A few years ago, the wifi adapter started to fail (I sometimes had to reboot it, disconnect it, etc. to get it to work), and finally it eventually died. So a little ...
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143 views

Install Canon printer in CUPS on RPI3

I'm trying to install a Canon MF4570dw in CUPS on a Raspberry Pi 3, but I can't make it work. This is what I've tried so far: 1. Install the printer from PPD files I've extracted the latest Canon ...
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1answer
26 views

Why Interface wifi Change every reboot?

I connected a wifi adapter, I have a different connection configuration for each one but when restarting the interfaces change, wlan0 -> internal wifi, wlan1 -> external wifi After reboot: wlan1 ...
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35 views

Autostart of executable does not show the correct icon and path

I have an executable file that are generated from a python program by using auto-py-to-exe, a gui front for pyinstaller, and a .ico file for a 64x64 icon, both placed in /home/pi/TestAS/Program. The ...
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2answers
108 views

Raspberry Pi 3 B insanely slow on basically all tasks

My Raspberry Pi 3 B is only connected via Ethernet to the network and running a couple of server tasks, among them an HTML web server (nginx PostgreSQL Typo3). This was working perfectly fine for ...
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1answer
60 views

Raspberry Pi WiFi Hotspot / Access Point

I am a beginner Raspberry Pi user and my knowledge is mainly around software. I don't know the correct terms for what I am trying to do so this may be a duplicate question. Is it possible to connect ...
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26 views

Python sound recognition?

I'm trying to program my Pi to monitor for specific sounds like buzzers, alarms, etc. I've seen articles suggesting the use of a "sound sensor", but I already have a microphone (an AIY ...
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3answers
96 views

How to schedule turning off and on of a pi4 using cron?

How to schedule turn off and on of a pi4 using cron ? Hello, to save power I wanted to schedule precisely when my RPI has to be turned on and off. I think Cron was a good solution so I try to edit ...
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1answer
64 views

Turn on an LED with dimming and stay on

I want to start the LED gradually with dimming by using PWM. And then once at a ChangeDutyCycle(100) I want it to remain on GPIO.output(led, GPIO.HIGH). import RPi.GPIO as GPIO import time led = 17 ...
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25 views

How to operate the camera on raspi3?

My material: Raspberry 3 + camera (official) purchased together and never used before Validated interfaces: ssh, vnc serial-console and camera Added software: Apache, php, mariadb phpmyadmin I took ...
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43 views

Change the CPU Core Voltage from terminal

I was wondering if anyone is aware of how I can change the CPU Core Voltage of a Raspberry pi using system calls from the terminal. I know that we can do this by setting the over_voltage parameter in /...
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25 views

Overclocking Raspberry Pi after the device has booted

I using a Raspberry-Pi 3B+ device and I am trying to change the maximum frequency after the device has booted. From my understanding, this can be done by editing the files under /sys/devices/system/...
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32 views

Specifics on connecting RFM69 to pi3

I am trying to follow these instructions to test a RFM69 module added to an Raspberry Pi 3. This is likely rather naive, but I would like to know details on how to connect the pi to the module. The ...
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1answer
31 views

Raspberry Pi Model B Current Overdraw from 3.3V Pin

I am using RPi3 ModelB V1.2 for a motor control project. I am connecting Pin1 (3.3V) for power to a micro dc motor. The current drawn by the motor is approx ~70 mA whereas the RPi sources mention that ...
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1answer
41 views

How do I make my Raspberry Pi act as a wireless USB controller? Not over the same network but remotely using a 3G/4G & LTE Base HAT [closed]

I am trying to download data from a USB based device remotely. i.e. Using a WiFi dongle or 3G/4G & LTE Base HAT. Am I able to install a driver for a WiFi dongle or 3G/4G & LTE Base HAT on an ...
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1answer
36 views

How to make Raspberry Pi connect to my Wifi using headless method?

I have followed many tutorials (actually they have been doing the same thing) on how to set Raspberry Pi to connect to my WIFI but I am not winning. I have used the Headless method and my network file ...
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156 views

No analog sound in Raspberry Pi 3

I have a Raspberry Pi 3 with Raspbian Buster installed. When playing Youtube I get no sound through speakers connected by audio jack. After some research, I did the following: 1.Audio output is set to ...

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