Questions tagged [pi-3b+]

Use for questions specific to the Raspberry Pi 3 Model B+

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Raspberry Pi3B with USB to TTL Rs232 Module

i have a TTL Rs232 Module (https://www.amazon.de/-/en/gp/product/B08HPSFFTT/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1) plugged into my pi and connected RX to TX. The converter getting ...
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USB stop working on some resolutions

I have an usb camera connected to a raspberry pi 3b, it worked smoothly until this last week. I made a couple of app updates on the pi and probabbly some got goofy. I learn from another forum that ...
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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-...
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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 ...
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PROJ_DIR is set, using existing PROJ installation

I got this error on rapberry pi 3b, when I run pip install -r requirements.txt PROJ_DIR is set, using existing PROJ installation.. Python 3.9 pyproj 3.3.1
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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....
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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 ...
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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 3b+ and saving it on my thumb-drive. However, when trying to record a video with my thumb-drive mounted to /var/www/...
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Improving Raspberry Pi 3 Hashrate

I have a Raspberry Pi 3 Model B+ (2017 printed on the circuit board) and I am mining XMR. So far my hash rate hovers at around 0.5H/s. I have read several posts mentioning performance at around 10H/s ...
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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 ...
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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)...
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Raspistill returns a black image althogh preview is fine

I am using Raspberry pi 3b+ with raspivam v2 raspistill -t 5000 -awb off -ex off -drc off -ss 5400 -awbg 1.1,1.95 -ISO 120 -ag 1 -dg 1 -vf -hf -o LastImageName.jpg and get a good preview and a black ...
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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 ...
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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 ...
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SSH is not working on RPI? [duplicate]

My Rpi was working fine before. after I power it up again it and accessing via ssh pi@192.168.154.38 and its returning "permission denied, try again". then I have done some changes in root/...
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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: ...
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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?
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HC-S404 stops reading when another GPIO pin is declared

I am working on an obstacle avoiding robot using Raspberry pi 3 and an HC-S404 ultrasonic sensor. The distance measurement is perfect when trigger and echo are the only pins declared. Whenever, I ...
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Unable to login unless external hard drive is disconnected

I had set up my Pi 3b as a NAS with the help of an external hard drive, powered by a USB hub. This worked for a week. Today after boot, I'm seeing the message: You are in emergency mode. After ...
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How can I interpret this GPIO Alt-Modes?

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. I analysed the alt Modes ...
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28 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 ...
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2 answers
33 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, ...
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1 vote
1 answer
62 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. ...
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Are Waveshare 2-CH_RS232_HAT stackable?

Is it possible to stack the Waveshare 2-CH_RS232_HAT? This is a link to the wiki page: https://www.waveshare.com/wiki/2-CH_RS232_HAT. The hat is driven via SPI, the interrupt pin can be chosen, there ...
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Connecting Raspberry Pi to Two HC-05

I am working on a project that requires me to use a Raspberry Pi 3B+ to read frequently published (< .1 sec) data from two HC-05 devices and write that data to a file. Is this possible or do I have ...
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Raspberry PI 3 b+: network disconnect frequently

I have been using 5 rpi 3 b+ on Raspberry pi OS, it works well but I have observed that the network drops after a day operation and network stays are disconnected till rpi is restarted to establish ...
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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 ...
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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 = ...
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Docker image - armv7 - Python Alpine 3.6

Using docker on a PI3, I need to rebuild an image which uses Alpine 3.6 - but I get an error. The URL is fine, but when a CURL it, it shows a redirect. I've tried 3.9 and 3.10 as well, but I believe I ...
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3 answers
142 views

Python script stops mysteriously after a few hours

The Problem I have a raspberry pi 3b+ running a python 3.7 script that is controlling an arduino. The arduino is reading values in from a few different sensors, and sending the data back to the python ...
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Monitoring power consumption of a Raspberry Pi 3B+ device

I am wondering if it is possible to measure the power being consumed by the CPU core (ARM chip) of a Raspberry Pi? Specifically, I want to monitor this power consumption for various applications that ...
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33 views

Raspberry Pi 3+ throttled when connected to atlas sensors and LCD

I want to make a hydroponic nutrient monitoring system, so I bought atlas scientific sensors for my project. There are 3 types of atlas sensors and LCD 20x04 that are connected to my raspberry pi 3B+. ...
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1 answer
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Raspberry PI not visible on windows explorer

I use a raspberry pi(3b+) for home assistant. It ran a few weeks good, but suddently it didn't work anymore. Now i can not even anymore access the raspberry pi through windows explorer. Does anybody ...
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How to set up GPSD for a USB GPS/IRNSS receiver?

I am using a Raspberry Pi 3B with a Quectel L89 EVB kit (the receiver). The receiver is connected to the Pi through the USB port. The pi Identifies the connected receiver at ttyUSB0. I'm able to see ...
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153 views

Using the Dynamic Device Tree to add Overlays at Run Time

I am working on a couple of ideas for device tree overlays for the RPi 3B+ & 4B. It will be useful in my testing to be able to load and unload overlays without having to reboot each time. As ...
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How do I rotate LCD touch panel on a Raspberry Pi 3?

I know this question has been asked many times, but I can't find a solution that works anywhere to rotate the official raspberry pi touch screen (not the display part as this is working, just the ...
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3 answers
164 views

Rpi3B+ ssh session drops randomly

I have a Raspberry Pi 3 Model B Plus Rev 1.3 in my Ethernet network that runs headless with octoprint and an arduino pro mini connected to it via i2c. Wifi is disabled. The Rpi is powered from an ...
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1 answer
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Odd SPI issue only works when toggled

I'm running a pi 3b+ and I'm having a weird issue with SPI. I have a breadboard with an mcp3008 chip, and a potentiometer connected to it. I can get voltage values some of the time. I either have to ...
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30 views

I2C slave fifo sync issue

For testing purposes of my firmware of an ESP32 I would like to simulate the sensor it's communicating with through I2C. Therefore I'm trying to setup my Raspberry Pi 3B+ as an I2C Slave So it could ...
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'Firmware 1.05' text lingers via HDMI

Raspberry Pi 3B running Retropi (v4.7.21) inside a PiBoy DMG (firmware v1.05) When I connect this to my monitor via HDMI, it opens with the usual white ExperimentalPi splash screen, which is where '...
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Can I run two python script using the same pi camera in raspberry pi?

I am currently working on a project where I need to have a live stream video and a motion detection that when a motion is detected, records a 10 second video. I have put each functionality in ...
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1 vote
3 answers
71 views

Haunted House - ceiling fan triggering pi button

I have a raspberry pi 3b+ and a haunted house. My raspberry pi sits in the living room tv cabinet (with adequate ventilation) as a server. I had a large button lying around, so i put it inside a small ...
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PiCan 2 Data Logging on higher frequency problem

I have a project that logs data from a vechicle's OBD 2 port (using PiCan2 on top of RPi3B) and combines that data with data from sensors connected to an external Arduino. The Arduino communicates ...
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1 answer
79 views

Youtube on Raspbian OS

I am trying to install Youtube on a Rpi 3b+ but I get the fake apps (like Youtubuddy).Can I install Youtube on a Raspberry pi without running youtube in a browser ?
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83 views

Consistent Motor control - specifically 180 degrees

I am struggling to get my motors to perform the same on each run. The first time I run the program, they will perform the same movement about 8/10 times. The second time I start the program, the ...
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40 views

Additional SPI bus raspberry pi 3b+

I'm trying to read 2 devices from SPI bus nRF24 module and MAX31865. I read the MAX module constantly every second and need to read the nRF24 module from time to time in other binary, but when I just ...
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2 answers
55 views

Using multiple LDRs and capacitors with Raspberry Pi 3B +

I am pairing an LDR with a capacitor to to make a light sensing project by returning the value of the variable COUNT when the capacitor is charged. But when i do this with 2 or more LDRs the values of ...
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ADXL345 shows non-zero acceleration value when idle

I am using an ADXL345 accelerometer connected to a Raspberry Pi 3B+.I have written a python code to check the acceleration value. However, the accelerometer always shows a non-zero value for the x and ...
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63 views

Can't SSH into raspberry pi after being inactive for a while

Alright, so, I've recently set up the Raspbian OS on the raspberry pi 3b, and I can ssh into it normally. Although, if I leave the pi inactive for a while and don't do anything with it, I'm unable to ...
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1 vote
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3 12V DC motors on raspberry pi with L298N

Completely new to this stuff. For context, I am trying to connect 3 DC motors that probably are 12v. I haven't bought them yet, they will definitely be more than 5v. I want to be able to control all ...
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