Questions tagged [pi-3b+]
Use for questions specific to the Raspberry Pi 3 Model B+
132
questions
54
votes
4
answers
282k
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.
- 58.6k
11
votes
4
answers
20k
views
Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?
I think there might be a problem with my new Pi. I'm using the same power supply (purchased from PiHut for my previous 3B) in the new 3B+ but I get the rainbow screen and the red power light flashes ...
- 213
6
votes
4
answers
21k
views
How to program active cooling connected to GPIO
I have Raspberry Pi 3b+ with the case, which has a small 5v fan, which is connected to GPIO.
Look to picture below:
The Fan runs continuously, but I don't want continuous operation. I want the fan to ...
- 145
3
votes
2
answers
3k
views
DS18B20 Temperature Sensor - Rpi 3/4 Driver, Wiring, Detection, and Python Programming
I am new in raspberry pi.
In my research project, I would like to monitor ground temperature at 60 points. My team decided to set a monitoring system using raspberry pi.
As a preliminary test, I ...
- 39
8
votes
1
answer
4k
views
Netbooting multiple "workers" RPi from a "master" RPi
My question is, I believe, a little bit complex, and I think it would be better to fully describe what I have and what I want to achieve, with what I am able to do.
What I have
I have a group of ...
- 83
7
votes
3
answers
7k
views
Switch between wifi client and access point without reboot
I want my Raspberry Pi to be used as access point or as client connected to my internet router but not both together. So I want to switch between these two modes with one simple command without ...
- 41.9k
2
votes
1
answer
3k
views
Pi 3 model B+ won't boot
I was using this specific Pi for over a month now without any issues. Today, out of the blue, the screen started flickering. I decided to shut it down. When I replugged it, the green led wasn't ...
- 21
0
votes
3
answers
2k
views
Rpi3B+ micro USB connector got 15V power. Is it dead? Can I save it?
I accidentally gave 15V to a Raspberry Pi 3 B+ Micro USB slot, when I observed some smoke I instantly removed in from the power supply.
What can I do to restore my Raspberry Pi?
Jai Garg
4
votes
2
answers
10k
views
How to check if SPI is enabled and functional on Raspi 3b+?
I have run raspi-config and enabled SPI and also verified that /boot/config.txt contains the line:
dtparam=spi=on
However, when I run lsmod | grep spi I get the following:
spidev ...
- 145
1
vote
1
answer
1k
views
Rpi3B+ Python Controlling Multiple SIM800 / SIM900 / SIM7600 Modules
My goal is to control at least 3 SIM800c hats using just one RPi but I'm not quite sure it will work.
How will Rpi reference each hat?
Can each hat make a call of their own?
For reference:
How to ...
- 147
5
votes
1
answer
3k
views
Output fsck on boot to a log file
I'd like to use fsck on every boot of my RPi 3B+ server. To do this I will be using tune2fs -c 1 /dev/mmcblk0p2. When fsck runs I'd like the output to be added to a log file in /home/pi/fsck.log with ...
- 357
2
votes
1
answer
5k
views
RPI3 Raspbian Stretch regular connection on wlan0 AP on wlan1
I'm trying to make a very simple setup with my RPi. On the on-board standard wlan0 I want to connect to my home network normally, using a wpa_supplicant file this works very well.
Now I'm having ...
- 123
1
vote
1
answer
4k
views
pi-3b+ ubuntu-core boot problem [duplicate]
i've a pi-3b+ it boots raspbian but does not boot ubuntu-core. When i write ubuntu-core image for pi-3 stable from here the red led lights only. When i write ubuntu-core image for pi-3 edge from here ...
- 113
11
votes
3
answers
33k
views
How fast can GPIO pins toggle?
I'm currently using Python's RPi.GPIO module to toggle some pins, and I want to know how quickly it can do this. I need the pins to be toggled on the schedule of a ~50 mhz FPGA clock, which I'm ...
- 233
4
votes
2
answers
4k
views
Pi 3 Model B+ doesn't boot - Power Supply or broken?
I just bought a Raspberry Pi 3 Model B+. I also bought a power supply that the reseller sold specifically for the Pi - it delivers up to 3A.
However, the Pi doesn't boot. I gives me the rainbow screen ...
- 41
3
votes
1
answer
2k
views
Swapping between wifi client and access point?
This question is an extension of the information on this post.
This question looks the same as this one but it is not. I am using systemd-networkd.
I successfully followed the instructions in the ...
- 175
3
votes
1
answer
2k
views
Rainbow Screen after Android Things installation
I am new to Raspberry and Android Things. I have a Raspberry Pi 3 B+ and I am using latest Android Things (followed as per Android Developer Site). But why is it only showing Rainbow Screen after the ...
- 31
2
votes
1
answer
3k
views
Raspberry Pi 3b+ do not detect DS18b20 on 1Wire
Problem: The new raspbian kernel does not detect the DS18b20 sensor over the 1wire bus. This is due to the Device Tree that was added to Kernel 3.18.8
What hardware used:
Raspberry Pi 3b+ Kernel: 4....
- 23
2
votes
1
answer
762
views
Wrongly junctioned GPIO 1 and GPIO 2
I wanted to connect an fan to GPIO 1 and GPIO 6 and what happens is that accidentally GPIO 1 & 2 were junctioned.
I saw an light only and from that moment is not starting.
Anyone has any ide how ...
- 123
2
votes
1
answer
13k
views
Rpi Python I2C IOError: [Errno 121] Remote I/O error Problem. How to fix it?
I am trying to read analog data from a potentiometer using I2C connection between the pi and adc board using python code. Below is my code so far:
import time
import smbus
bus = smbus.SMBus(1)
bus....
1
vote
1
answer
2k
views
Pi HAT Waveform Generator for Raspberry Pi 3B+
I am looking for a Pi HAT capable of generating 300 kHz sine waves at about 8 samples per waveform with my Raspberry Pi 3B+. Sampling rate required is around 2.5 MSps. Output voltage ideally needs to ...
- 11
0
votes
3
answers
1k
views
How fast I can read at raspberry pi 3 model b's GPIO
I want to read the output of OV7670 camera module that produces 8-bit output at a very high frequency. The output pixel clock frequency is around 8MHz. I have to sample those 8-bit data at raspberry ...
-1
votes
1
answer
1k
views
Response to a incoming call using python script
I am trying to implement a system using Raspberry-pi and SIM-800 modules. Now I can see incoming calls from my python script, but it can not parse data.
import serial
serialport = serial.Serial("/...
-1
votes
1
answer
358
views
Control function for a DC servomotor angle
I am using a Raspberry Pi 3B+ with servomotor shields to control multiple servomotors at once with Python. I know that the travel angle of a servomotor is controlled using PWM. So there exists a ...
14
votes
10
answers
102k
views
WiFi won't start
I have a new Pi 3 B+ and am running openplotter version of NOOBS. When I boot, WiFi doesn't show on the top right of the home screen.
When I run raspi-config for Network Options and WiFi, I get
'...
- 167
10
votes
4
answers
16k
views
Raspbian 8 on Raspberry Pi 3 B+
How can I can use my old Raspbian 8 (Jessie) SD card installation on the Pi 3 B+?
I changed files in /boot. (start.elf, start_cd.elf, start_db.elf, start_x.elf, bcm2708-rpi-0-w.dtb, bcm2708-rpi-b.dtb,...
- 103
5
votes
1
answer
2k
views
Change PI 3 against PI 3 B+ [duplicate]
Currently I have a PI 3 B running with Raspbian Jessie. It has a 3 TB external Usb-HDD which holds the root partition for the Pi. The SD-Card is only used to start the Grub and afterwards the HDD ...
- 51
4
votes
1
answer
8k
views
Disable 5Ghz Wifi-band on Raspberry Pi 3B+
is it possible to disable the ability to use 5Ghz for the wlan0 interface?
I only want to use 2.4 Ghz Wifi Networks.
So only 2.4Ghz Wifi is available and 5Ghz is disabled.
thanks in advance
- 63
3
votes
2
answers
2k
views
Setting up Bridged VPN using: RPi 3G Hotspot router + openvpn client to connect to home RPi OpenVPN server
I have a Raspberry Pi 3B+ which is working as a hotspot using a Hologram Nova usb ppp0 device where it receives Internet from and routes the internet through WiFi and Ethernet. This Hologram usb ppp0 ...
- 146
2
votes
1
answer
3k
views
Rpi3B+ Buster WiFi 5GHz Connection Problem
Raspbian 10 buster here. I tried to connect 5GHz WiFi but it didn't ever see the hotspot. I changed WiFi county to US and it worked.
Now Rpi detects the hotspot and can connect to it but connection ...
- 21
2
votes
1
answer
3k
views
Controlling 5 LIDARs using Raspberry Pi
I came across this instructable which illustrates how to connect the TFMini LiDAR to the Raspberry Pi. In the list of materials, he said that I will be needing a Resistor (between 100-1k Ohm) (...
- 147
2
votes
1
answer
401
views
Using an additional WiFi dongle to create WAP and switch
I followed the answer to this question:
Access point as WiFi router/repeater with additional WiFi-dongle
To have my 3 B+ act as a WiFi hotspot where wlan1 connects to the internet (WAN) and the pi ...
2
votes
1
answer
7k
views
Where is the Polyfuse of Raspberry Pi3?
I wan to test the polyfuse of the Raspberry pi3 B+ I try to find where it is but it said in the search result locate the F3 but there is no F3 in the board written anyone can help?
- 103
2
votes
2
answers
4k
views
Setting up multiple I2C buses using dtoverlay
I am trying to set up multiple I2C interfaces on my pi.
I have added the following lines to my /boot/config.txt and rebooted:
dtoverlay=i2c-gpio,bus=4,i2c_gpio_delay_us=1,i2c_gpio_sda=29,...
- 97
1
vote
1
answer
470
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.
...
- 11
1
vote
3
answers
10k
views
RetroPie fails to boot on Raspberry Pi 3 Model B+ with rainbow screen and flashing red led
I downloaded the latest version of RetroPie (v4.3) to a formatted SanDisk 16GB SD card. When I try to boot RetroPie on a brand new Raspberry Pi 3 Model B+, it gets stuck on a rainbow screen.
I've ...
- 19
1
vote
1
answer
271
views
RPI not booting, only red LED, not the SD card
My RPI 3B+ won't boot up anymore. Only the red LED lights up, the green one remains off. I use the official power supply, and my SD card is not corrupted.
My SD card realy isn't the problem: I tried ...
- 121
1
vote
1
answer
936
views
RPi4B PCA9685 PWM Controlling Many Servos
I have this RPi3 that I am running a bunch codes on it. It is communicating with a server and also I have python supervisor running on it. Now I am trying to set up the same system on RPi4. For some ...
- 169
1
vote
2
answers
3k
views
How to connect two BME280 sensors via I2C to a Raspberry Pi 3B+
I have a Raspberry Pi 3B+ and I bought two BME280 sensors (specifically these) and I would like to connect them via I2C. I read that you can do software multiplexing but all the information I am ...
1
vote
1
answer
2k
views
Low wifi speed even with 5Ghz wifi adapter
My internet download speed from my D-Link wifi router is 24 M bits/s
From ethernet the download speed is 50 Mbits/s
I am using Tp-link AC600 Archer T2U Plus wifi adapter with Rapberry pi 3B+
I ...
- 43
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
2
answers
1k
views
Make Raspberrypi boot from USB first
I have RaspberryPi 3B+. I read that there is a way to make my raspberry boot from USB by changing config.txt that will change the OTP. Is there a way to make my raspberry to boot from USB and only if ...
0
votes
1
answer
4k
views
Wifi Not Working with Ubuntu MATE 16.04 and Pi 3b+
I was able to get Ubuntu MATE to finally run on my Pi 3B+ after following this tutorial: https://www.youtube.com/watch?v=tdJrd75_068&lc=z234tvgocvmqyzb5a04t1aokgml1ll00iwv1gbnt2da0rk0h00410....
0
votes
2
answers
118
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 ...
- 69
0
votes
1
answer
6k
views
How to install Kali Linux on a USB for the RaspberryPi?
Boot stuck at "random: crng init done" while using balenaEtcher or Win32 Disk Imager to flash Kali onto a USB.
Device: Raspberry Pi 3B+
Image: kali-linux-2019.4-rpi3-nexmon.img.xz from offensive-...
- 139
-1
votes
2
answers
6k
views
How to achieve a high sampling speed using an ADC with Raspberry Pi?
So, I am using the LTC 2366, 3 MSPS ADC and using the code given below, was able to achieve a sampling rate of about 380 KSPS.
#include <stdio.h>
#include <time.h>
#include <bcm2835.h&...
-2
votes
1
answer
2k
views
Unable to locate package libdbus-1
So, I'm trying to run the following code on my Raspberry Pi 3b+:
sudo apt-get update && sudo apt-get install -y libdbus-1{,-dev}
And I get the following result:
Unable to locate package ...
20
votes
1
answer
41k
views
How to setup the Raspberry Pi 3 onboard WiFi for Ubuntu Server 18.04 with netplan?
How to setup of Raspberry Pi 3 B+ onboard WiFi for Ubuntu Server 18.04? In particular, with netplan?
This is a clean install of the Ubuntu Server 18.04 image for Raspberry Pi 3. File: ubuntu-18.04.2-...
- 563
10
votes
4
answers
10k
views
Shorted 3.3v + 5v together. Is it possible to repair?
I was reading through some instructions on how to add a power off/on button to the Pi and accidentally misread instructions and shorted the two end pins on a 3+B model, which appear to be 3.3v and 5v. ...
- 211
9
votes
4
answers
12k
views
Performance differences running Raspbian from USB flash drive versus SD card
I want to run Raspbian from a USB flash drive on a Raspberry Pi 3B+.
What would be the performance difference in doing so, as compared to running Raspbian from an SD card?
- 211