Questions tagged [pi-3]

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

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1answer
19 views

Ca-certificates won't allow complete RP Update

I'm trying to install 'Syncthing' on Raspberry Pi, which I have done several times in the past, the install requires that I run apt-get update. This is using Rpi OS "stretch". The update ...
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0answers
35 views

startup.sh not starting [closed]

I have a file in the /config/autostart/ folder which will exec=/home/pi/startup.sh, but it does not launch the startup.sh. Can someone help me? I have checked the rights and also made my user a sudo ...
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1answer
42 views

Can my Raspberry Pi Zero W python program be duplicated and resold?

I have a Raspberry Pi Zero W that runs a program under the main username, Pi. I'm going to give this Pi to someone for their own use, however I expect them to use the Pi for their application without ...
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0answers
17 views

How to switch Cameras on the Raspberry pi 3b?

I am working on a project and I need to take pictures in different directions depending on a programming input, I can manually switch the cameras and take a photo with them but I am looking for a good ...
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1answer
17 views

How to detect if the user is booting from microSD versus an external USB drive (e.g. SSD)?

I am writing a bash script and I really want a way to detect if the user has booted from a microSD card versus an external SSD drive connected via USB. Ideally, this should work with any PI3/4. I am ...
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1answer
54 views

Libcamera does not work on the latest OS

I bought the new HD RPi camera and want to connect it to my RPi 3. I checked on the Rpi website that raspistill is being replaced by libcamera, so I updated the OS to the most recent build (Bullseye) ...
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0answers
43 views

Pi 3B (without +) regularly losing Ethernet connection (smsc95xx)

I have a problem with some of my PIs losing Ethernet connection every few days to a month. After the Ethernet connection is lost, it does not come back up. Besides the Ethernet connection being lost, ...
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0answers
16 views

Scrolling text on MAX7219 dot display is lagging occasionally, not sure how to fix

I am using the max7219 library from luma.led_matrix.device import max7219 However, if I use 12 8x8 dot displays in series, the scrolling font lags on random occasions. It looks like it lags for some ...
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2answers
283 views

My raspberry pi is dead?

I have a raspberry pi 3 B that apparently stopped working after a thunderstorm. When it's plugged the red power led turns on but I can't boot the OS. I checked the voltage on GPIO pins and I get: 2....
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1answer
35 views

Open matchbox-keyboard on top of existing applications

I have a Tkinter script running in fullscreen mode. I have a function which calls the matchbox-keyboard command using the subprocess module when clicked on an input field. This works fine, but the ...
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1answer
169 views

Corrupted SD Card - how to fix, or recover data?

I recently got my hands on an older pi (Model 3B), that I had left at my mom's house some time ago. When I went to start it, it wouldn't boot. The red light came on but the screen remained black. I ...
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1answer
45 views

Why the GPIO light gets switched ON but not SCL1

I am trying to make this circuit I have only attached two pins. By default shouldn't both pins be ON? Why only GPIO 17 is ON (shows light)? I notice that once I connect all the wires, the GPIO ...
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0answers
36 views

Creative project recommendations or where to find them?

I'm a relative newbie to Raspberry Pi and I'm trying to decide on a project that might both relate to my interests and help develop my programming skills. I've a Pi3 and have only done some small ...
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0answers
23 views

Detect raspberry pi with android smartphone

I would like to find a way to detect a specific Raspberry Pi from an Android smartphone, whenever it gets near the Pi. Background is the following: I want the smartphone to activate a hotspot and ...
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0answers
19 views

Reading SPI data from Atmel Energy meter IC M90E32AS through Raspberry Pi

Iam trying to read voltage values from Atmel Energy meter (AtM90E32AS) IC through Raspberry pi(3b) SPI communication. I made the connection accordingly and set the register values as given in the data ...
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0answers
11 views

How to get the correct speed in low light and low ISO

With IMX219 camera and using piCamera in a Python script with resolution = (3280,2464) I get a photo image with a speed of 1/15 sec and ISO 320, correct auto exposure. Setting iso=100 I get a photo ...
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0answers
30 views

Macbook unable to connect to RPi wifi using RaspAP

Maybe the wrong spot to post this, but I'm hoping to get some direction. I'm trying to build a Wireless AP using RaspAP and a Pi 3B. Everything seems to work fine, except for one little issue: I can'...
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1answer
19 views

Assigning priority to callback function for multiple GPIO.add_event_detect

Iam trying to create the error detection application for my battery charger prototype using Rpi.GPIO. I successfully created the add event detect for multiple GPIO pins (totally 8 pins for each error)....
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2answers
110 views

Raspberry Pi 3 Model B v1.2 really slow

My Pi has been running 24/7 for approx 3 years. Is it possible that it is just worn out? I installed a fresh Raspberry Pi OS Lite on a brandnew Intenso Class 10 mircoSD. When I run apt-get update &...
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1answer
37 views

'sudo' not recognized as an internal or external command. Trying to run sudo raspi-config

I am building my first project on a Raspberry Pi 3 using an RFID HAT for Raspberry Pi. I am using Windows 10 IOT Core. The manual for the RFID HAT begins with this: I2C/Serial interface is disabled by ...
2
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1answer
50 views

Misreadings from hall sensor after using a motor controller

I am measuring a hall sensor included in a motor. A Raspberry Pi 3b+ controls a Sabertooth 2x32 motor controller through radio Signal (ppm) and the Sabertooth output is connected to the motor. I get ...
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1answer
63 views

dtoverlay=gpio-shutdown,gpio_pull=off

I was wondering if utilizing the code below would be sufficient in shutting down and restarting a Raspberry Pi 3 A+ with the use of a TTP223 capacitive touch sensor. By default, the touch sensor is ...
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1answer
64 views

How to enable serial communication on Rasbpian Buster or the lastest OS right out of the BOX?

Latest Raspbian Buster OS and Raspberry Pi 3 V1.2 2015 This I can't get my head around this. Why can't I set up serial communication on Raspbian Buster for Raspberry Pi3 very easily after following ...
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2answers
59 views

Where can I find spec of hardware random number generator used on Raspberry Pi?

I remember stumbling upon the fact Raspberry Pi devices have built-in hardware random number generator. Would someone happen to know where I can find official hardware random number generator spec?
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1answer
63 views

What does setting output high or low mean in RPi.GPIO

If I setup a pin's output to HIGH or LOW, would current flow through it or not? In this example, when I set output to HIGH then the LED turns off. I expected the other way around. The python code I ...
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0answers
52 views

The `pkg-config` command doesn't find the `bcm_host` package. How can I add the `.pc` files from `/opt/vc/lib/pkgconfig` to pkg-config?

I am running a raspberry pi 3B (V 1.2). I am using the proprietary OpenGLES driver (Broadcom). I have just run a full apt upgrade. I am trying to build SDL2 and I noticed that while it was being ...
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1answer
14 views

I am currently doing the 'Build a LAMP website' project and mousepad is not working

I am a newbie to Raspberry pi and I am unable to continue, I am currently at: https://projects.raspberrypi.org/en/projects/lamp-web-server-with-wordpress/2 and in need to use the following command:'...
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0answers
37 views

RPI 3 extremely slow routing speed between 2 wifi adapters

I'm trying to use Raspberry Pi as a WiFi repeater, but routing speed is extremely slow. I've configured hostapd to work on wlan0 (onboard WiFi adapter) and wpa_supplicant on wlan1 (external adapter). ...
0
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1answer
32 views

code using polling working more reliably than code using interrupt

I am coding this lamp circuit in which an LED is switched on/off on alternate press of switch I have written two versions of the code, one using polling and other using interrupts. I found that the ...
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0answers
26 views

Connect Raspberry Pi from Android App through USB

I'm building an android app where there's a requirement to show the temperature in the app from the sensor in Raspberry Pi Controller. For this purpose, I'm trying to connect my android device to ...
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1answer
41 views

Unable to create a switch on/off functionality in RasberryPi

I am trying to create a program which which switch an LED ON or OFF when a switch is pressed. The following is the circuit diagram The python code is import RPi.GPIO as GPIO is_lamp_on = False try: ...
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1answer
59 views

Hardcode RF Codes - RPi-RF

I would like to use the rpi-rf module https://pypi.org/project/rpi-rf/ for a remote control alert system, using a PIR motion sensor as the input. I have so far set up the PIR input and send and ...
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0answers
88 views

Unable to boot two latest releases of Raspberry Pi OS

I'm trying to emulate Raspberry Pi 3 B in QEMU and I was able to successfully boot the oldest OS release from here: https://downloads.raspberrypi.org/raspios_lite_arm64/images/raspios_lite_arm64-2020-...
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0answers
15 views

How to troubleshoot Raspberry Pi 3B that gets random mini freezes

I have a Raspberry Pi 3B with Dietpi as the OS which is connected via ethernet and using the official power supply. I have this Raspberry Pi from quite some time ago, and I noticed recently that ...
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1answer
51 views

Neopixel with raspberry pi

I am using a neopixel for my raspberry pi project. I am trying to control 30 pixels and the strip is 20cm long. Can I use it just by using the pi's 5v pin? Also if I it is possible, how long should ...
-2
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1answer
29 views

Hotspot/Access Point not working, no connection whatsoever

I followed a tutorial on Youtube that would essentially turn your Raspberry Pi into a hotspot/access point. I did the exact same processes he did, even looking at the Pi Documentations to see if I had ...
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2answers
207 views

How to enable both UART (ttyS0 and ttyAMA0) on Raspberry Pi 3b?

I've already read dozens of manuals and stack topics, but I do not figure out if it even possible run both UARTs on RPi 3B. Some tutorials advice to map uart to other pins in /boot/config.txt I tried ...
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1answer
51 views

PC -> LAN -> PI -> LAN -> Router -> Internet

I want to use the pi3 as gateway (to scan network traffic + pihole). My desktop is connected via cabled connection. The route (outbound): Computer, Ethernet port ---EthernetCable---> PI3, USB-...
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2answers
120 views

How to determine if hardware is damaged

I have a Pi 3 Model B Rev 1.2 which has been running fine for 2 months. It was accidentally knocked off its shelf yesterday (about 1foot drop) It booted back up fine, but now it only stays on for 20 ...
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0answers
41 views

How do I send data from sensors using a Raspberry Pi over WiFi to a webpage?

So far I have the code that reads the distance using the razbery pi sensor, but how can I do the rest? if anyone can help me with a tutorial so I can understand, I'm new and I don't really understand ...
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2answers
56 views

What is the maximum sound output in dB provided by 3.5mm Audio port in Raspberry pi3?

maximum sound output in dB provided by 3.5mm Audio port in Raspberry pi3?
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0answers
26 views

Turning off a Raspberry Pi 3 B+ not connected to Mac

I've seen lots of questions about safely turning off the Raspberry Pi but I haven't found what I'm looking for. My Raspberry Pi is connected directly to the power adapter and not to my laptop. What is ...
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0answers
33 views

ad hoc on raspbian buster pi 3

I have read a few other questions about this topic in this network and other places. The problem is they are all different and none of them have worked on Buster. Here are my questions: 1- With ad-hoc,...
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0answers
29 views

How to crosscompile a kernel for raspbian in an arch linux host?

I have a raspberrypi 3B and want to compile and install a new kernel on it, but I only have an arch linux(x86_64) host to compile it on. Following the official documentation I get stuck trying to ...
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0answers
27 views

How can I get my pi3 to consistently display to the monitor?

I have a pi that will not stay awake and display to the monitor consistently. After 10 minutes it will blank. Here are the methods I have tried so far: Adding xscreensaver, and editing it in the menu ...
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0answers
24 views

Using the Google AIY kit with Ubuntu 18 (ARM)

I installed Ubuntu 18 (ARM) on a Raspberry Pi 3B so that I could use ROS melodic to control an iRobot Create2. Everything has been going splendidly until I noticed the Google AIY Voice kit I had ...
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0answers
15 views

RPi 3B+ hosting a video stream no longer running

I have a Pi 3B+ running Raspbian Buster which has the camera module setup that was hosting a stream in my LAN for over a year. It is inside a Kestrel nesting box and has suddenly stopped working (...
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1answer
52 views

Communication between Raspberry pi and Android studio Application

I've created a mobile application using android studio to control some leds, sensors, and locks. So I'd want to connect my mobile application to my raspberry pi to send and receive data, how could I ...
0
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1answer
32 views

Troubles understanding routing rules

I'm trying to use my RPI3 in order to read datas from ethernet communication and send them over wifi to a remote FTP server. I've been able to connect my RPI3 to internet via wlan0 so far, however I'...
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2answers
89 views

433MHz RF communication between Arduino + Raspberry Pi

I bought a 433MHz receiver and transmitter to send data from a Raspberry Pi 3 to an Arduino Uno. I searched the internet for tutorials, Arduino StackExchange and Raspberry Pi StackExchange but I did ...

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