Questions tagged [pi-3b+]

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

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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.
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  • 54.2k
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 ...
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  • 213
4 votes
4 answers
15k 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 ...
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  • 125
3 votes
2 answers
2k 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 ...
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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 ...
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6 votes
3 answers
6k 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 ...
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  • 40k
2 votes
1 answer
2k 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 ...
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0 votes
3 answers
1k 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?
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3 votes
2 answers
6k 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 ...
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  • 135
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 ...
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  • 137
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 ...
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  • 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 ...
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  • 113
4 votes
1 answer
2k 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 ...
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  • 337
10 votes
3 answers
25k 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 ...
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3 votes
1 answer
1k 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 ...
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  • 155
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 ...
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2 votes
1 answer
702 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 ...
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2 votes
1 answer
9k 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....
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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 ...
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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 ...
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  • 11
0 votes
2 answers
445 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 ...
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-1 votes
1 answer
295 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 ...
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-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("/...
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13 votes
10 answers
90k 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 '...
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  • 157
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. ...
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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 ...
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  • 136
2 votes
2 answers
3k 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,...
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2 votes
1 answer
2k 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....
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  • 23
10 votes
4 answers
15k 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,...
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  • 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 ...
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  • 51
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 ...
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2 votes
1 answer
331 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 ...
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2 votes
1 answer
6k 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?
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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 ...
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1 vote
1 answer
224 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 ...
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  • 121
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 ...
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1 vote
1 answer
729 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 ...
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  • 159
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 ...
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1 vote
1 answer
2k 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) (...
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  • 137
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....
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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. ...
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  • 1
0 votes
1 answer
5k 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-...
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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 ...
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0 votes
2 answers
315 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 ...
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20 votes
1 answer
38k 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-...
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7 votes
4 answers
7k views

PoE hat fan activation on OS other than Raspbian

I'm aware that the only officially supported OS that the PoE hat works on is Raspbian. I can confirm that both my hats work, and that the fan does switch on and off if I have Raspbian installed on the ...
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  • 175
8 votes
4 answers
9k 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?
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  • 191
6 votes
2 answers
10k views

Raspberry Pi 3B+ freezes randomly

General setup My RPi is connected to a mouse, keyboard, and monitor. My swap size is set to 1000 MB and I'm not using wifi. Problem The RPi freezes randomly, meaning the GUI is frozen, no SSH ...
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  • 73
4 votes
1 answer
8k views

What are the functions of the test pads on the Pi 3B/3B+?

The various models of the Raspberry Pi comprise numerous test pads (testing pins). Many of these pads however are not mentioned or properly labelled in the official reduced schematics the Raspberry Pi ...
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  • 15.5k
3 votes
1 answer
1k views

Running a persistent node js server on boot and keeping the command line open

I know there are a lot of answers to this question but none have worked for me and I've been at it for something like six hours... Most of the answers also look like they are years out of date. I am ...
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