Questions tagged [pi-3b+]

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

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1 answer
151 views

Crontab function not executing

Hell My name is Patrick and a Rpi newbi. I have made this project" industrial strenght cat feeder" from the instructables website. Everything is working 100% aside from the crontab function. ...
0 votes
0 answers
16 views

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 ...
0 votes
1 answer
29 views

Rpi 3b+ No Display 7inch TFT-LCD Composite Display

I have 7 inch display which I used in my car almost 10 years back I want to use it with my Rpi3b+. I tried changing various display modes in config.txt like sdtv mode =0 and other numbers. None of ...
0 votes
1 answer
67 views

USB Wifi not working on boot

I am using TP-WN727N usb wifi module with raspberry pi 3b+. It using MT7601U driver. Wifi is working fine if I reconnect it but not detecting after reboot.
-1 votes
1 answer
45 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 ...
0 votes
1 answer
39 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
1 answer
809 views

Unable to install Mongo-DB on Raspberry Pi with Ubuntu Core 18.04

I am trying to install mongoDB on my Raspberry Pi 3b+, which has an ARM 4-Core 64 bit processor. I was trying to install MongoDB on my Pi just as mentioned in their documentation but unfortunately I ...
0 votes
0 answers
19 views

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 ...
0 votes
1 answer
783 views

use raspberry 3+ and PN532 Itead with i2c

nfc-scan-device uses libnfc 1.7.1 1 NFC device found: error libnfc.bus.i2c error : worte only -1bytes (10 expected) error libnfc.driver.pn532_i2c Unable to transmit data(TX) pn53x check_communication:...
0 votes
1 answer
41 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-...
1 vote
1 answer
839 views

How to use Ethernet and Wifi on Pi3b+ and Raspbian buster

Yes, I am aware that similar questions have been asked before on this StackExchange but almost all of those are old and don't seem to be working for me. After googling around I found that things have ...
0 votes
1 answer
355 views

Rasclock with Raspbian Buster not working

the rasclock is detected by the raspberry Pi but if I want to read or set the time on it I got the error hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Remote I/O error dmesg ...
1 vote
2 answers
2k views

BlueZ BTGATT-client.py WriteValue

I had a successful attempts with BlueZ-5.50 > test > example-gatt-client.py with ESP32 set as HeartRate Sensor Server.I am able to read from ESP32 which i modified to suit the BlueZ example. ...
0 votes
1 answer
38 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
2 answers
532 views

raspberry pi as gateway lan/wifi

I bought Raspberri Pi 4 and installed predefined OS on it (I am using it headless). Raspberry pi is not connected to internet. Now I need to do this: in RPI Lan port is connected computer (device), ...
0 votes
3 answers
3k views

How to toggle button on and off with gpiozero?

I can't seem to find a solution of doing this using gpiozero. I've done it using rpi.gpio with add_event_detect and call back to change state but I was under the impression gpiozero is much simpler. ...
1 vote
1 answer
7k views

Difference between iface wlan0 inet manual and iface wlan0 inet dhcp in wifi to ethernet router?

I have developed a wifi to ethernet router. Wifi is connected to my home router having internet and ethernet is connected to my laptop( just for testing).My laptop is not getting internet, but it gets ...
0 votes
2 answers
457 views

I think I fried my RPi

I am working on two stepper motors and trying to control them using RPi3(Ubuntu mate) with A4988 motor drivers. I successfully managed to drive the motors with external 12V battery source. After ...
0 votes
0 answers
17 views

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
0 votes
0 answers
17 views

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 ...
0 votes
1 answer
512 views

Raspberry Pi running python opencv on php

I try to use the php running the python: <?php $command=shell_exec('sudo python /var/www/html/FacialRecognition/simpleCamTest.py 2>&1'); echo $command; ?> But the result show in ...
0 votes
2 answers
392 views

Clarification on Access point as WiFi repeater, optional with bridge needed

Regarding the detailed instructions for Access point as WiFi repeater, optional with bridge here: Access point as WiFi repeater, optional with bridge Since the raspberry pi 3 b+ has only one radio, ...
1 vote
0 answers
12 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....
0 votes
1 answer
89 views

Issue after a few hours of correct operations over wifi shared between an access point and a wifi client

I have a Raspberry Pi 3B+ running Raspbian 32 bit. It runs correctly as an access point and a wifi client over the integrated wifi. It does not use systemd-kerneld. I followed the different steps ...
0 votes
1 answer
27 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 3b+ and saving it on my thumb-drive. However, when trying to record a video with my thumb-drive mounted to /var/www/...
0 votes
0 answers
26 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 vote
3 answers
4k views

Problem autostarting pigpiod

On my Pi3B+ I had pigpiod configured to run on boot and I can successfully run compiled c programs; specifically DHTXXD.c which contains:- /* DHTXXD.c 2016-02-16 Public Domain */ #include <stdio....
0 votes
1 answer
385 views

Pi 3 B+, 7" official touch screen and a Sense Hat query

New here, but wanted to ask about the above. My Pi 3 B+ is connected to an official &" Touchscreen display, which uses a double adaptor to provide power to the Pi and scren. This work fine. ...
0 votes
0 answers
23 views

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 ...
0 votes
0 answers
40 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 ...
1 vote
1 answer
5k views

3B+ fails to boot Ubuntu mate

I have the problem that the bootloader and kernel are too old in the mate image to run the on the new hardware. Raspian works fine with a noobs install. I tried the advice in the thread here https:...
-1 votes
3 answers
229 views

How come my 5V relay is always switched on? How to fix it?

#Libraries import RPi.GPIO as GPIO import time #set GPIO Pins GPIO_TRIGGER = 18 GPIO_ECHO = 24 GPIO_IN = 21 #GPIO Mode (BOARD / BCM) GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) # To avoid ...
1 vote
1 answer
214 views

Timed trigger for GPIO input

I'm running a raspberry pi system that records fish as they swim passed an IR break beam sensor at a fish ladder. So far the system works well but I'm trying to cut down some of the false triggers. ...
-1 votes
2 answers
55 views

Unable to get IP address of Raspberry pi to give remote desktop connection

I am trying to give my Raspberry pi 3 B+ remote access using my windows laptop. I have connected raspberry using a ethernet cable and gave wifi connection to laptop. Then I tried making a bridge ...
0 votes
1 answer
122 views

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 ...
0 votes
3 answers
163 views

How to choose a suitable display for pi 3 B+?

I'm currently looking for a display 5 inches or less for my PI, but there are a lot of information and since I'm quite new to the world of raspberry I'm looking for some help and guidance on where ...
0 votes
1 answer
39 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
39 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 pi@192.168.154.38 and its returning "permission denied, try again". then I have done some changes in root/...
0 votes
1 answer
681 views

Cant install php

I'm kind of new to the linux os and I'm having trouble installing php. i needed a few tools for jasper which alwys show up in the error message. sudo apt-get install php -y Reading package ...
0 votes
2 answers
93 views

How can i set up my owm serial communication between two Raspberrys?

i have following Problem: I have A raspberry Pi 3B+ with a Touchscreen, which uses every Single Pin on the 40Pin GPIO header. The only thing i have is a i2c breakout on my Touchscreen. But i have the ...
1 vote
1 answer
3k views

Rpi3b+ to Rpi3b+ jtag/SWD connection and OpenOCD

I'd like to hook together two Raspberry pi 3b+ to use jtag/SWD with OpenOCD. I learned it can be done, but implementing it has proven challenging. I have two questions: How to connect the Rpi's. If I'...
0 votes
1 answer
3k views

How to interface MLX90614 temperature sensor with Raspberry Pi

I have a mlx90614 sensor and I am interfacing it with raspberry pi 3 B+. I am using adafruit library python. Below is the code: import Adafruit_GPIO.I2C as I2C I2C.require_repeated_start() class ...
0 votes
1 answer
89 views

why frequency output is not constant?

[![I uploaded piscope image and same time output image also for better understanding of issues][1]][1]I am using sample code of Pypi from "http://abyz.co.uk/rpi/pigpio/python.html" to detect ...
0 votes
1 answer
137 views

Raspberry pi + L298 H bridge motor speed reduced when battery circuit shows 50%

I made a raspberry pi car. The pi is powered by two 18650 (Breewell New Multipurpose Flat Top 18650 Battery 2000 mAh 3.7 Volt Lithium Genuine Rechargeable Battery -Pack of 2 https://www.amazon.in/dp/...
0 votes
3 answers
995 views

AM2302 no signal using Raspberry Pi 3

I am trying to setup a AM2302 (DHT22) to use with Raspberry Pi, and unable to get a signal. What I need help is to be able to conclude whether the problem is due to (1) sensor fault (2) wiring fault (...
0 votes
1 answer
129 views

PIServer network boot

When i boot a raspberry pi model 3b+ from the piserver running on debian stretch x86 i get the follow error : ---[end Kernel panic - not syncing : VFS : unable to mount root fs on unknow-block(2,...
0 votes
1 answer
569 views

RPI Motion service delay on restart

Is there any way to delay the start of the Motion service on RPI restart? I'm having an issue where v4l does not make it yet to provide /dev/video0 but Motion is already trying to open it and ...
51 votes
4 answers
263k views

How do I make serial work on the Raspberry Pi3 (PiZeroW, Pi4 or later models)

My Pi3 serial console produces rubbish and fails to respond to the keyboard.
-1 votes
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, ...
2 votes
1 answer
1k views

How to split a display into many and access all the screen

I'm trying to split the screen in raspberry-pi. and access each screen for each display I want the multiple layer in a single screen. Eg. my output screen resolution is 1024x720 in that i have to ...

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