Questions tagged [pi-3]

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

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1answer
24 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
98 views
+100

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
44 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
31 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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22 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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18 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
10 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
28 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
91 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
35 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 ...
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1answer
48 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
57 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
57 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
55 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
53 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
33 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
13 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
25 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
25 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
40 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
56 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
80 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
48 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 ...
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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
133 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 ...
2
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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
91 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
37 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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0answers
26 views

Raspberry Pi 3 USB to HDMI converter

I'm wondering if I could set up a Rasp Pi 3 up as a converter for a USB webcam to output as an HDMI source. Preferably once done, the program will run automatically once the Pi is turned on. Which OS ...
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2answers
51 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
32 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
26 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
21 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
49 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 ...
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1answer
27 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
76 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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3answers
62 views

How to find reboot/shutdown cause in Buster OS?

I was analyzing my raspberry pi for reboot and its time and its cause. Earlier I was working on Jessie and I was able to understand the reboot or shutdown is normal by observing the syslog file for ...
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1answer
44 views

How to check what is going wrong during boot time of a possibly bricked Raspberry Pi 3 Model B?

I have a Raspberry Pi 3 Model B before me with the following history: For several weeks this device was inside a Cable Box and was doing a lot of I/O on the SD card (and not on an USB stick as it is ...
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0answers
27 views

How do I restrict SSID logon info on a user basis?

Currently, when a user logs on, the network last used is connected. Do not want this to happen when the "guest" user logs on if the previous user was on the primary network. Also, logon ...
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0answers
22 views

Garbled Characters on SSH

I am using a RPI3 for my project, sometimes the device stops working (e.g web server stops responding, or some other functions stop working correctly) and when I try to check the problem by SSHing to ...
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0answers
29 views

How do I fix or troubleshoot my Raspberry pi 3? [closed]

This is my first raspberry pi project. I got a raspberry pi3 with an alpha bot kit and I am trying to set the RP3 up. When I plugged it in I didn't get the boot up screen that was described in the ...
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2answers
51 views

Does Raspberry Pi 3B have polyfuse? Can USB ports blow polyfuse? [duplicate]

Does Raspberry Pi 3b have polyfuse? If it does, under what conditions can it be 'blown'? I suspect my RPi 3b polyfuse to be blown, but I don't know what's causing it. I'm using an external HDD for ...
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0answers
36 views

RPi3 randomly freezing and timing out SSH connections

I have set up an RPi3 running a Node.js server (with pm2) in a remote location. Even though the internet is quite fast, the pi sometimes times out or is very very slow. Recently I have set up a ...
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1answer
196 views

Raspberry pi with HDD and SSD not booting on reboot

I have a Raspberry Pi 4 B with 2 disks connected via usb. One is an SSD and the other is an HDD. Both of them are in SATA to USB cases that have their own power supply each. I've configured the Rpi4 ...

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