Questions tagged [pi-3b+]
Use for questions specific to the Raspberry Pi 3 Model B+
1,145
questions
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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. ...
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0
votes
1
answer
80
views
Recover zero-byte size file on attached USB storage
I have an attached USB hard disk drive on my Raspberry Pi with an NTFS file system used as a network-attached storage.
My problem is after a while, some big files, like 2GB and up (usually ISO, Zip, ...
- 125
0
votes
1
answer
1k
views
How to find client signal strength from the Rpi command line?
I have a network made of Rpi, ubiquities, and esp8266. Raspberry pi is configured as the eth0 to eth1 router. Eth1 is made using a USB to ethernet converter. The Main ubiquiti is connected to the eth1 ...
- 191
0
votes
0
answers
1k
views
Failed building wheel for pandas on model 3B+
I'm trying to install pandas in a Python virtualenv on a RPi model 3B+,
but its wheel fails to build.
Pandas does however successfully build/install for the system Python (py3.7.3, pip 18.1).
Could ...
- 101
1
vote
0
answers
57
views
heartbeat sensor for pi
i want to measure the heartbeat using the pulse sensor. i connected the pulse sensor to a mcp3008 adc and the pi.
this is the code i used
from pulsesensor import Pulsesensor
import time
p = ...
1
vote
1
answer
269
views
one wire ds18b20 showing no output
i connected a one wire ds18b20 temperature sensor to my pi 3b+.this is the code
import time
from w1thermsensor import W1ThermSensor
sensor = W1ThermSensor()
while True:
temperature = sensor....
0
votes
0
answers
149
views
3B+ won't boot from USB Hard Drive
I flashed Raspbian to a 1TB Samsung Hard drive, and when I try to boot it using a USB hard drive reader (which gets power from a barrel connector), The red light turns on, But there is no Yellow ...
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0
votes
1
answer
1k
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Raspberry Chromium v88 (88.0.4324.187) keeps crashing (Error code : 11)
I have problems with kiosk application on Raspberry. I'm using chromium as digital signage presentation. System was working fine, until few days ago. I get crash report Error code 11.
From error log, ...
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votes
2
answers
339
views
Toggling GPIO via BCM2835 registers on RPi 3B+
I am trying to toggle GPIO directly by setting BCM2835 registers. This is the code i wrote for this purpose and I wonder why doesn't it work. If the approach is wrong, then how to access GPIO ...
0
votes
2
answers
164
views
Can't access my RPI 3 using SSH
I used to be able to SSH my RPI without difficulty but on resurrecting my PI and reinstalling Raspbian SSH does not work. I can ping the Pi OK. I have tried switching off VPN and avast but still no ...
-1
votes
1
answer
53
views
Maximum usage USB and GPIO power consumption
I use a raspberry Pi3B+ for a home automation installation. On which I have connected several peripherals. In particular an RFID reader and an OLED screen. But I notice that after a while, these ...
0
votes
2
answers
562
views
Gigabit Ethernet on RPi3B+
I have a problem with my network interface. My ISP provides a 1000Mbps download connection, but doing a speedtest from my raspberry pi 3b + it stays below 10Mbps so I ran ethtool eth0 and I find that ...
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0
votes
2
answers
131
views
Any particular reason why my RPi 3B+ reports 20x worse results from Speedtest.net? [closed]
I have RPi 3B+ connected to exactly the same router as my PC (wired!).
I have installed Speedtest.net client using this guide. When executing speedtest-cli --simple, I am getting nearly exactly twenty ...
- 141
0
votes
0
answers
127
views
Just plugging the USB with OS in it doesn't make the RPI3B+ boot
Flashed RetroPi OS into a flash disk. I plug it to the nearest USB slot to the board and the Ethernet. When I connect the power cable and the hdmi, it doesn't boot. I can't test if my Pi still works ...
user134779
0
votes
0
answers
28
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 ...
- 101
0
votes
1
answer
20
views
RPi3 would not start (red led on always), but then it started without any explanation
Yesterday, electricity went down at the location where I have an RPi3 setup. After electricity came back, the pi did not start. I went to see what's happening with the pi, and indeed, the red led was ...
- 691
2
votes
2
answers
474
views
Do I need a base resistor for a transistor? [closed]
All
I plan to drive a 51 ohm LED using the pi's 5v pin using a 2n2222 transistor connected to the GPIO. Do I need a resistor on the base pin of the transistor or can I connect it directly to a GPIO ...
- 23
0
votes
0
answers
732
views
Unable to import pyserial or serial in python 3.4.2
I am not able to import pyserial or serial module in a python script. Package is properly installed (I think) using the following commands:
sudo apt-get install python3-serial
pip3 install pyserial --...
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1
vote
1
answer
954
views
Serial port fails after some time
I use a RPi 3b to request and receive float values over serial from an Arduino Nano (fake). For that I use python and pyserial.
Arduino Loop:
if (Serial.available() > 0) {
String req = Serial....
- 13
0
votes
1
answer
85
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.
- 101
0
votes
0
answers
95
views
Raspberry pi ethernet cable no longer working
I was working on Raspberry pi3+ for few days and didnt have any issues today unexpectedly after connecting it the ethernet LEDs didnt light up i tried 2 different ethernet cables the issue persisted ...
0
votes
0
answers
71
views
While trying to install a fan, I accidentally plugged fan's GND and 5V pins to RPi 3B+ pins 2 and 4 (both 5V)
Instead of plugging the fan in pins 4 and 6, I accidentally plugged it in pins 2 and 4. The Pi immediately shut down. There are no signs of life other than the red LED that is on all the time. Is the ...
- 1
0
votes
2
answers
521
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 ...
- 239
1
vote
1
answer
123
views
Raspberry Pi cooled with a Peltier cell [closed]
I've an RPI3B+ mounted in an IP65 box and placed inside a greenhouse. Obviously the CPU becames really hot during the day and it reaches 80°C (even after the installation of the small heatsinks). I ...
- 11
0
votes
1
answer
278
views
Pi 3B+ External Activity LED
How can I add an external activity LED to Pi 3B+?
Like to my Pi casing.
-1
votes
1
answer
937
views
Install Oracle on Raspberry
0
I need help!!
I'm doing a school project where we have to install Oracle on our Rapberry pi 3.
We have already download from Oracle website
Basic Package(RPM) -SQL*Plus Package(RPM) -SDK Package(RPM)...
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0
votes
0
answers
27
views
How to change the menu icon 2021
i have a Raspberry Pi 3 model B+ I have installed Raspbian OS on it.
So i have looked it up but all i can find is outdated guides. i have tried to replace the launch image in /usr/share/raspberry-...
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0
votes
1
answer
669
views
Can i power my Raspberry pi 3 b+ with a micro-USB to USB thats connected to a USB charger?
I read in the manual, that u should charge it with 5V and 2.5 amp, but im not sure. I already read, that a undervoltage can damage the pi and that USB 3.x would be enough, but I still dont know how ...
-1
votes
1
answer
399
views
Rpi 3B+ "Unsupported board type" Flashing Power Light
I have a Pi 3B+ that wont boot. It's a "new" unit that I received as a gift a few years ago and am just now taking it out of the box and trying to use it.
I've tried several OS images, but ...
- 99
0
votes
1
answer
27
views
Pi addressing ping to the wrong destination [closed]
I have a private network that requires end to end connectivity
pi 1 -> device 1 -> device 2 -> pi 2
The traffic is getting all the way from pi 1 to pi 2
However, the return doesn't work
...
0
votes
0
answers
468
views
Raspberry Pi 3+ / 4 wifi connection problem
I am setting up the RPis 0W, 2, 3, 3+, and 4 for some tests. For the connection to the internet, I use WiFi. The setup worked as expected till the Pi 3+, which refused to connect to the router. Then I ...
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votes
1
answer
789
views
Raspberry Pi 3B+ XRDP Very Slow!
I have a Raspberry Pi 3B+ and I just installed xrdp on it. I wanted to do this so I can do some ROS projects. But just after using RDP to log in to the Pi, I was welcomed with a painfully slow desktop....
0
votes
1
answer
1k
views
Battery Management System (BMS) [closed]
I'm making a UAV using raspberry pi and I understand that it does not require a complicated BMS since it won't have complicated circuitry. The only problem I'm facing right now is that of the BMS. I ...
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2
votes
3
answers
575
views
syslog and kern.log filling with: rc rc0: IR event FIFO is full!
I have a Pi that has recently developed a habit of maxing the SD card with syslog messages (somewhere in the hundreds per second) of the message: "Date/Time user kernel: [ 2257.432445] rc rc0: IR ...
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1
vote
0
answers
110
views
How to use an Rpi (3B+) as a layer 3 bridge, wifi to eth0 connected printer with a static address, using proxyARP and seamless port forwarding?
I am quite new to networking, but have semi-successfully spent time experimenting with different, well documented approaches to using an Rpi to bridge wifi connection from the wlan0 interface to an ...
- 108
1
vote
4
answers
264
views
Temperature, Humidity and Weight monitoring for beehives using Raspberry Pi Zero [closed]
I'm new about Raspberry world..
I'm studying a way to implement a custom beehive monitoring system.
I would like to make a premise: I'm studying to organize the project, I'm not yet implementing or ...
- 121
1
vote
1
answer
2k
views
Can't see 5GHz wifi with a 3B+
I have some issues with 5 GHz wifi on my Pi 3B+, it won't discover 5 GHz networks but only 2.4 GHz. I have set the wifi country, try to force the connection with correct SSID / password on the ...
- 41
1
vote
0
answers
414
views
My rfid-rc522 reader stops reading after some time, how can I debug it?
I'm using the reader below to read mifare cards (13.56mhz), I have an electron/node.js application for this. For some reason after an uncertain amount of time(shortest time I noticed was about 30 ...
- 131
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votes
3
answers
287
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 ...
- 11
0
votes
2
answers
918
views
Raspberry Pi and ultrasonic distance sensor HC-SR04
So I have my Raspberry Pi, I watched a YouTube tutorial on what to do. I copied absolutely everything, but still, it's not working. The wiring is surely correct as it is copied from the video and the ...
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0
votes
0
answers
208
views
SIM800 shield as Internet provider
I've been using for a while a Huawei USB dongle as an Internet provider for my Raspberry Pi, which I have connected to my solar panels system at my country house (which doesn't have an accessible ...
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votes
1
answer
130
views
Problem with GPIO PIN 4 (Physical pin 7)
I have a simple LED circuit. I want to connect 3 LEDs to 3 different GPIO pins 2,3 & 4 (GPIO numbering).
Pins 2 and 3 works perfectly fine, but 4 wasn't working as expected.
I disconnected all the ...
0
votes
0
answers
247
views
How can I dim my 7" LCD touchscreen display using Raspberry OS?
I have a 7" TFT LCD and I am building my own car head unit but obviously it is vital that it can dim. There are dim buttons on the board and an on/off screen button.
I have tried using:
echo n &...
- 1
1
vote
0
answers
73
views
Turn off red light? Override read-only?
I wanna turn off the red light on my raspberry pi. I have searched and found that I should run this command:
sudo sh -c "echo heartbeat >/sys/class/leds/led0/trigger"
But I get "zsh:...
- 159
1
vote
3
answers
69
views
Is it possible to reboot my pi3b+ after I have run sudo halt without unplugging it and replugging it back in? [duplicate]
Is it possible to reboot my pi3b+ after I have run sudo halt without unplugging it and replugging it back in? I do not like pulling the power out of the micro usb over and over as I do not want to ...
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votes
1
answer
162
views
Rx buffer overwrites Tx buffer in spidev xfer2
Coming here from electronics SE as it was suggested that I post here on this issue. The electronics SE post is here.
I'm setting up a comms link between an STM32F407 MCU and the Pi3B+. The Pi is ...
- 193
1
vote
3
answers
1k
views
`aplay` and `espeak` cannot play audio on user that is not pi
I'm trying to test the audio through the headphone jack using aplay /usr/share/sounds/alsa/* on Rasbian 5.10.17 on a Raspberry Pi 3 B+. This works fine on the pi user, but not on root or another user ...
- 121
1
vote
1
answer
757
views
arecord no such file or directory error when running via cron
So I can run:
arecord -d 9 -f S16_LE -c 1 -r44100 -t wav /home/pi/signal_9s.wav
from terminal and it works as expected. It records for 9 seconds and saves to the signal_9s.wav file. However if I set ...
- 113
0
votes
1
answer
206
views
Are there further ideas for a repair of a 3.3V -> 5V shorted pi?
I accidentally shorted my pi's (3 B+) 3.3V and 5V GPIO-Pins.
I was curious how to repair it and found this helpful answer. So I reworked the pi as described: Removed the broken MXL7704-R3, soldered a ...
0
votes
0
answers
62
views
Raspberry Pi 3 (Model B) Connected to WiFi but cannot load websites
Note: This question is NOT a copy of any others.
I have a Raspberry Pi 3 (Model B) running Raspbian that is connected to my WiFi, but is not loading websites. I can still ping sites and that works ...
