Questions tagged [pi-3b+]
Use for questions specific to the Raspberry Pi 3 Model B+
1,171
questions
1
vote
1
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160
views
How can I monitor for an incoming Wake on Lan packet?
I am using a Raspberry Pi to power on a computer that is not capable of Wake on LAN. I want to send the already on Pi a WoL packet and trigger a relay with the GPIO pins. I am having a bit of trouble ...
- 11
2
votes
0
answers
77
views
How do I turn an brushless dc motor 1 cycle per second using pigpio and c++
I am using an esc and a bldc and im trying to slowly spin my bldc
I can get my motor to spin with
gpioServo()
but when I use
gpioPWM()
It just continues to beep
when i use
gpioServo()
it spins way ...
- 29
0
votes
0
answers
48
views
Raspberry pi 3 not reading SD cards
I have a raspberry pi 3 v1.2 that is not reading SD cards. I DO have another pi 3, and that one reads and boots with the SD card in question without any issues whatsoever. On the working pi, I can ...
- 11
0
votes
1
answer
305
views
I broke SSH access to my Raspberry Pi
I had my Raspberry Pi 3B+ running old Raspbian Jessy. I was connecting to it by ssh. I have installed uhubctl.
uhubctl is a tool which can turn off power supply for USB port.
I got
# uhubctl
Current ...
- 175
1
vote
1
answer
144
views
LXDE-pi -- cannot show desktop on local monitor, but VNC is fine
I'm setting my RaspberryPi 3B+ (Debian Buster) up as a magic mirror. I've run into a really weird issue that I can't wrap my brain around.
The magic mirror software is basically an EletronJS app, ...
- 11
2
votes
2
answers
175
views
How to correctly identify the pin addresses in the Pi4J 2.2.1 GPIO API?
I can't seem to get the right pin number.
Let's say I want to access this pin:
What's the actual address of the pin? 11, 26 or what?
Here's the code I use: (THIS CODE WORKS WITH PIN BCM 23)
final ...
- 123
0
votes
0
answers
35
views
Raspberry PI locking/unlocking system
I have a door lock connected to RPi and I would like to unlock and lock doors by remote control.
My idea was to make a separate server in the Cloud and that this server pushes an event (lock/unlock) ...
1
vote
2
answers
62
views
RPI 3 B+ 3V3 Shorted to Ground, Pin 18 Shorted to ground. Can this be Saved or is Pin 18 a safe sign for a dead CPU?
As the title suggests. I removed the power managment chip already but 3V3 is still shorted to ground.Since the schemtacis arent complete i cant find all caps to test first.Can there be another issue ...
- 11
1
vote
0
answers
38
views
Respond to GPIO in fastest way possible
I'm trying to respond to a trigger from a ~1MHz clock and I'm having trouble doing this in the time required (under 400ns). I'm using a Raspberry Pi 3b+ and I've seen benchmarks of 50Mhz+ for toggling ...
- 111
3
votes
1
answer
161
views
Raspberry Pi doesn't boot after using 5v pin
I recently got a Raspberry Pi 3B+, and it booted just fine and worked properly. I also had a 12v latch solenoid (the solenoid worked when I connected it to a 9v battery). I connected one end of the ...
-1
votes
1
answer
56
views
Does using a RPi 3B image on RPi 3B+ cause network issues?
I flashed a RPi 3B backup image into an RPi 3B+. The device booted and is working just fine. But I keep getting a bunch of network issues. The device connects to one of my networks but is unable to ...
- 1
0
votes
1
answer
378
views
Raspberry Pi 3B+ PMIC Replacement, 1V8 available for a while then no voltage again
I've done a PMIC replacement once on Rasp pi 3B+ and managed to get it working again. This is the second time I've done a PMIC replacement.
The symptoms are exactly the same, PWR LED on, 3v3 and 1v8 ...
0
votes
0
answers
32
views
Traces below micro-USB power
If I were to drill through the micro-USB power port on a raspberry pi 3 b+, would I drill through any important traces on the board?
Concept Image below
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1
vote
1
answer
75
views
Pi 3B+ & 4 cannot send SPI write over 128 bytes in PIGPIO C
I am using the pigpio C interface to drive an OLED, and cannot send transfers of over 128 bytes using the spi_write command. Apart from this spi_write works, as well as all other GPIO pin use for D/C ...
- 13
2
votes
0
answers
55
views
Raspberry PI 3B+ losing connnection
I have a problem with my raspberry. I can connect to it using putty(ssh) or VNC Viewer, but after few minutes the connection drops.
I still see it listed when i go to "connected devices" on ...
- 21
1
vote
1
answer
195
views
2 motors on L298N controlled with GPIO from Rpi3B .. python telling me channel already in use and motors not turning
I have adopted Electronics hub tutorial to run 2 motors from a L298N controlled by Rpi3B using GPIO.
Why is my version of the code not working?
I do understand that I could ignore the "channel ...
- 13
1
vote
1
answer
548
views
how many threads for Rasp Pi B+ when running a script?
I am tinkering around with some computer vision code....and there is an argument for the script for the number of CPU threads to run the model. where it defaults as 4 where I am assuming this code is ...
- 237
1
vote
1
answer
113
views
Create Wireless Hotspot doesn't work
I want to turn my Raspberry Pi 3b into a Wi-Fi Access Point, but i have the probleme as you can see in this image
0
votes
1
answer
104
views
Peer-to-peer networking with ethernet
I had an idea for transferring data between Pi's. It involves directly connecting two Pi's to each other only using a single cat5 ethernet cable, and transferring data in a peer to peer manner. I have ...
1
vote
1
answer
86
views
How to get measured(analog/digital) output from 801s vibration sensor? [closed]
I have Rpi3B+, 801s vibration sensor and a ADC. I need the analog output to plot a graph for analysis. Basically I need to observe how vibration is affecting the other properties of the machine. ...
2
votes
0
answers
415
views
Wireless display with Raspberry PI 3
So, I Googled around for this, but it feels like almost all questions on the internet about this kind of thing are "how to stream from my laptop to my pi".
I was wondering about the other ...
- 121
0
votes
0
answers
69
views
How to mimic RC signals using raspberry pi?
I am working on an automated Quadcopter and I am trying to build a flight controller using Arduino board and raspberry pi.
I don't want to use a transmitter and receiver in this project instead wants ...
1
vote
0
answers
51
views
No FIQ.h on Raspberry PI3B+
I was exploring the FQI routine for ARM processors. I noticed that most Linux kernels provide a fiq.h header file yet my RPi does not seem to have it. Using find does not return anything. My Linux ...
- 21
1
vote
0
answers
187
views
How to Define USB Port as a Stable Name on Raspberry PI 3B+
In my Pi,
on the /etc/udev/rules.d/10-local.rules file
ACTION=="add", SYMLINK+="USB4", ATTRS{devpath}=="1.5"
ACTION=="add", SYMLINK+="USB1", ATTRS{...
0
votes
0
answers
104
views
Hostapd on Pi Connection failed
I am using a PI 3B+ and the Rasbian light Version on it. I build the hostapd on my PI with wget, so that i can make modifications on it. After building and starting (build and make) the hostapd, ...
0
votes
1
answer
72
views
I can't get My BLDC (Brushless DC motor) to run
Goal
Use Pulse Width Modulation (I think that is the standard approach) to control the speed of my BLDC.
I have tried so many things
#include <stdio.h>
#include <inttypes.h>
#include <...
- 29
-1
votes
1
answer
90
views
Surely I can run sox with alsa without pulseaudio
Why would I want to do that? because pulseaudio isn't needed (presumably) and pulseaudio does not want to run as root. In theory I should be able to run pulseaudio --system to fix the problem, but I ...
- 117
1
vote
3
answers
148
views
Stop docker container on unmount
I'm trying to debug something that I don't quite understand well.
I have setup an automount of an external drive with:
/etc/fstab
UUID={RANDOM_UUID} /media/pi/Storage ext4 defaults,nofail,x-systemd....
- 113
0
votes
0
answers
50
views
Raspberry Pi 3b - Undervoltage problem after using same power supply and cable
I have been using RPi 3b for several months with a set of power supply and cable. I recently upgraded raspbian to Bullseye. That was also fine. I added a camera today and then on RPi is not booting. I ...
- 1
0
votes
0
answers
421
views
How to rotate the raspberry pi touchscreen 180 degrees?
I have a raspberry pi 3 b+ running Raspbian Bullseye with the raspberry pi official touch screen. The display is upside down. I've tried rotating with the Screen Configuration tool, but it doesn't ...
2
votes
3
answers
576
views
Board getting super hot, what's wrong with my Raspberry Pi 3?
So I was about to benchmark cooling techniques to cool my raspberries when I noticed that my RPI3B Rev 1.2 board was getting abnormally hot out of the box when booting a vanilla Raspbian from the SD ...
- 141
1
vote
0
answers
114
views
Incorrect values coming from 4-20mA ADC receiver
This is what I have.
Raspberry Pi3
i2c shield. https://store.ncd.io/product/i2c-shield-for-raspberry-pi-3-pi2-with-outward-facing-i2c-port-terminates-over-hdmi-port/
1-Channel 4-20mA Current Loop ...
- 111
0
votes
1
answer
1k
views
Unable to Rotate Display
I recently purchased an 8.8in display from AliExpress (8.8inch IPS HSD088IPW1 Long strip display Stretched Bar HDMI compatible Display Aida64 monitor USB 5V Power Second Display Case)
(https://www....
- 11
0
votes
1
answer
65
views
SSH Login Not Working
I have an SSH server running on my PI.
On my other device I run ssh ucyt5040@localhost -p8022.
It asks for a password.
I enter my password. I get Permission denied (publickey,password,keyboard-...
- 103
0
votes
1
answer
149
views
Cant install hostapd
So I removed hostapd with
sudo remove hostapd
but the folder
/etc/hostapd
still exist but even when I use
sudo apt install hostapd
it won’t bring back
/etc/hostapd/hostapd.conf
or the other ...
1
vote
0
answers
104
views
Can I use overlay filesystem on an expanded filesystem?
I've used raspi-config to activate overlay filesystem and made the boot partition read only. As I was running out of space I decided to use raspi-config to expand the filesystem to fill the entire SD....
- 11
0
votes
0
answers
137
views
why i can't run use command python3 but it work on thonny python
it work here
but it get erro when i use commend. this erro that i get
192.168.247.109 - - [15/Jul/2022 19:46:59] "GET / HTTP/1.1" 200 -
OpenCV Error: Assertion failed (!empty()) in ...
- 1
0
votes
1
answer
54
views
Unable to record video with RPi-Cam-Web-Interface with USB mounted
I am trying to record a video using RPi-Cam-Web-Interface on my Raspberry Pi model 3 B+ and saving it on my thumb-drive.
However, when trying to record a video with my thumb-drive mounted to /var/www/...
- 1
-1
votes
1
answer
66
views
Bs250 transistor as switch
Hi so I have button connected to pins 5 & 6 on rpi3. This is to "power it on"...
The button is also connected to another gpio 18 pin and python script listen for change and when it's ...
- 1
0
votes
1
answer
379
views
I2C communication on Raspberry Pi 3B using smbus2
I'm trying to connect my energy measurement IC with Raspberry Pi 3B using the I2C protocol. I'm using sudo i2cdetect -y 1 to detect the connected devices and it is correctly showing the address(7-bits)...
0
votes
0
answers
112
views
Problem with WIFI
I have a Pi 3B + and installed bullseyes ago to two month and not it detected wireless wifi, it say No wireless.
I does tried with raspi-config, enable wifi and it say no wireless.
so i does tried ...
0
votes
1
answer
58
views
Bridging two WiFi networks without a dongle
I would like to connect my Raspberry Pi 3B+ to a WiFi network and use it as an access point for its own network. I need it to act as a proxy so that I can connect multiple devices and they appear as a ...
0
votes
0
answers
44
views
SSH is not working on RPI? [duplicate]
My Rpi was working fine before. after I power it up again it and accessing via ssh [email protected] and its returning "permission denied, try again". then I have done some changes in root/...
0
votes
1
answer
144
views
Connect 2 RC522 to Raspberry Pi
I wanted to connect 2 RC522 to my Raspberry Pi.
I Followed the instructions from here. But then I got the error message:
/usr/local/lib/python3.9/dist-packages/mfrc522/MFRC522.py:151: RuntimeWarning: ...
- 9
2
votes
3
answers
888
views
Raspbery Pi 3B+ - My USB ports don't work, but ethernet does
This is a pretty short question.
My ethernet port works, but none of the usb ports seem to do anything when I plug anything in them. This is the case with a fresh raspi os image.
How can I debug this?
0
votes
0
answers
128
views
bluetooth network traffic monitoring
Is there anything that I can use to monitor my Bluetooth traffic just like the resource monitor in windows? I encounter nethogs in raspi but it only monitors wifi network. I want to know the B/sec of ...
0
votes
2
answers
482
views
How can I read the current ALT-Mode of a GPIO PIN?
i have a Hyperpixel 4.0 Touchscreen, which i use one my Raspberry PI 3b+
This Touchscreen is attached directly on the 40 GPIO-Pins and a few Pins have some special Alt-modes.
Out of personal Interest, ...
- 17
1
vote
1
answer
345
views
Raspberry Pi 3B+ board SMT component identification
i'm a college student so i cheaped out by buying a physically damaged RPi 3B+ planning to repair it myself (also as SMT soldering practice) but am having some difficulty identifying the damaged parts. ...
- 13
0
votes
0
answers
141
views
I2C OTHER PINS IN RASPERRY PI FOR I2C LCD
I am planning to put a power button on my raspberry pi 3b+ which uses the PIN 5 in order for me to shut it down and turn it on again when I wanted to. However, pin 5 is I2C CLOCK which is used for the ...
1
vote
1
answer
1k
views
reading two webcams in opencv
If I run this code on a PC with two webcams attached it runs fast (or fast enough) without any issues:
import cv2
cap0 = cv2.VideoCapture(0)
cap1 = cv2.VideoCapture(1)
while True:
ret0, img0 = ...
- 61