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37 views

Control two SPI devices at the same time

I have a problem with Raspberry Pi 3b+. I need to connect two DACs (MCP4911) to SPI bus 1. The two DACs are expected to output the different DC voltage level. However, I found that when I connected ...
0
votes
0answers
22 views

Starting python script at startup fails after some down time

EDIT: it seems that it starts randomly I have python script and I've created in lxsession/LXDE-pi/autostart file following command: sudo /usr/bin/python3.7 /home/pi/script.py If I type this command ...
0
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0answers
17 views

Connecting Raspberry pi 4 using RS485 can hat for communication between RPI 4 and 2 temp controller

I have purchased this RPI 4. And also RS485 driver Now i am wondering how to connect the RPI4 with my two temperature controllers which use the RS485 protocol. Kindly guide me in the step by step ...
-1
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0answers
23 views

Budiling small wine cellar rising from the table

I am not sure is it a correct place where should I ask that question, but I would like to build a small version of that rising from the ground wine cellar controlled by raspberry: https://www.youtube....
0
votes
1answer
64 views

Setup respeaker pi-hat 2 on RPI ZW

I am trying to run snips on my rpi0w, and has mounted the respeaker pi hat on to it. Installed the driver using git clone https://github.com/respeaker/seeed-voicecard cd seeed-voicecard sudo ./...
0
votes
2answers
133 views

LIRC Tutorial For Rpi2B+ Buster Too Old Problem

I'm trying to set up lirc on a Pi2 B+ running the latest Raspbian buster and latest kernel / firmware set by rpi-update. I've started from this HOW-TO. All I get from sudo modprobe lirc_rpi is: ...
0
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0answers
21 views

Disable Spectre/Meltdown mitigation in rasbian

As raspberry pi 4 use Cortex-A72 as CPU, it should be vulnerable against Spectre/Meltdown attacks, but rasbian has some patchs for these attacks. For some research purpose i need to disable these ...
0
votes
1answer
27 views

C++ Long Double or equivalent on ARM64

I'm having a hard time getting a straight answer about long double precision on ARM64 architecture. I'm engineering a scientific machine requiring extreme precision, and the driver, which I will write ...
0
votes
0answers
38 views

Can't Install Raspbian Because SD Card Shrunk

I have an 8 GB Kingston SD card that I'm using. I formatted the card with the formatter from sdcard.org and it kept its file size after format. I downloaded the NOOBS 3.2.1 file from RaspberryPi's ...
-1
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0answers
14 views

Unable to run ALPR on Raspberry Pi 3b+

Hi first time posting here. Im running Raspbian on Raspberry pi 3b+ and im having issues when i execute command alpr. when i run alpr it comes with this output: "bash: alpr: command not found" Ive ...
1
vote
0answers
32 views

Raspberry camera v1.2 results in kernel panic

Update I have found the following issues that might relate to this problem: Framerates below 1 are not supported (https://github.com/raspberrypi/userland/issues/575) Frequent sequential call hang (...
2
votes
2answers
123 views

AC mains dimmer dimming 7W LED lamp problem (RpiZero + MPDM V4.1)

I'm trying to dim a 7W LED with a Raspberry Pi Zero for home automation. However it doesn't work as expected. I followed this tutorial : https://www.youtube.com/watch?v=wqY4-gHqvZI . I have the exact ...
0
votes
3answers
73 views

How to interface more than 10x ADS1115 a raspberry pi?

Hello i am creating a shield for raspberry Pi 3/4 and in need of a lot of analog pins to read 30 sensors. and since the shield can only fit 5 sockets of the connector i am using i need to use 2 ...
0
votes
0answers
34 views

Pi Zero Segmentation Faults

I have two raspberry pi zeros.I wrote program using nodejs and opencv4nodejs. It works as intended on the first raspberry pi zero. On the second pi zero it crashes frequently due to Segmentation Fault....
0
votes
0answers
117 views

Cannot set 60Hz @4k with Raspi 4B

I just bought a Raspberry Pi model 4B. I am trying to set the video output to 4k resolution and 60Hz refresh rate. While I am able to have the output running at 4k resolution (3840x2160 pixels), I am ...
1
vote
2answers
65 views

Screen is blinking while playing video on vlc!

I am using PI4 with raspbian buster. While I am playing videos on VLC the screen sometimes blink. The blinking interval is random. Is it normal or is there a problem that is needed to be fixed?
0
votes
3answers
42 views

How can I connect a Raspberry Pi 3+ with a MacBook Pro 2018?

I would like to access my Raspberry Pi via SSH and am not sure how to connect it to my MacBook Pro from 2018, given that it only has USB-C ports. My idea was to buy a crossover Ethernet cable and an ...
0
votes
0answers
8 views

vsftpd server over ngrok

How would you configure a vsftpd server over ngrok on my pi? I know you can go pfw your router and etc, but my ISP doesn't allow me to. Currently I've set both listen_port and ftp_data_port to 201. ...
1
vote
1answer
14 views

I2S 3W Class D Amplifier and 2.2“ SPI-Display (ILI9341) - GPIO 18 Problem

I want to connect the Adafruit I2S 3W Class D Amplifier Breakout Board and an 2.2" TFT Display (ILI9341) to a Raspberry Pi Zero. However, it seems that by default both components use the GPIO 18 (the ...
0
votes
0answers
10 views

Pi Camera v2 Capture Photo without warm-up

I want to a project that capture some photos at a time. After taking photos i will send theese pictures to a windows platform to encoding. I saw so many examples about taking photos but i every code ...
0
votes
0answers
14 views

Dokuwiki install is getting a 502 gateway error from nginx

Goal: install dokuwiki on my raspi 3 Method: Using This tutorial to install Problem: I'm getting a 502 error from nginx when I try to run the install script. Configuration: eth0 is set to a static ...
0
votes
0answers
25 views

How should I move pi-hole from lighttpd config to a url the load from /pihole instead of website root?

By default when I installed pihole and lighttpd on my raspberry pi it took / as the default root location to load pi hole page and now everything of pi-hole sits under /var/www/ sa shown below: /var/...
0
votes
1answer
31 views

proxy arp / briding wlan0 and uap0

I try to setup a raspberry zero as repeater. First i used that guide : https://kaiuwe.hüber.de/raspberry-pi-wifi-repeater-ohne-adapter/ But it's not a real repeater , but setting up a secondary wlan ...
0
votes
1answer
36 views

Slaves on i²c bus aren't detected

I'm currently trying to get multiple i²c slaves with the same address working without the use of a multiplexer on a PI Model 3b. I followed this instrutable for the creation of a second i²c bus: cd /...
0
votes
1answer
45 views

Rocket Chat Installation HTTPS with Caddy error

I followed the installation instructions listed for the Raspberry Pi version of Rocket Chat on Github. The software installs properly. However, I am having an issue enabling HTTPS using caddy. The ...
1
vote
2answers
17 views

Cannot connect to Xserver during CLI boot

so i want to autorun my python script after boot in a CLI boot however it seems that its giving me an error "Cannot connect to Xserver". My python script uses a camera i used crontab to autorun my ...
0
votes
0answers
22 views

My screen turns off and I want to disable this feature

I am a total newbe but I have many years in the computer business so I have some technical knowledge. I just purchased a Pi4, 4gb beginners kit including official PS, cables and Noob card and ...
0
votes
1answer
30 views

Booting from network and installing os

Is it possible to download any suitable os from network and install it same way like using pxe boot on pc? Update: Reason for that is saving time when installin multiple Raspberries without need ...
1
vote
3answers
53 views

Which services on the Pi are mandatory and optional?

I am looking to make the Pi more responsive by disabling unneeded service. I am looking to disable services in /etc/init.d (and anywhere else if there are other places) and want to find a list ...
1
vote
1answer
46 views

Destination host unreachable, Pi not connected to internet

I'm using ssh to connect to the Pi from my MS Windows PC, and I'm using a wired connection to do so. Now the problem is even though my Pi is connected to wifi (which provides internet access), it ...
0
votes
1answer
27 views

I'm using my Pi as a seedbox using Deluge - how would I create torrents to add to the seedbox?

I have some files on my Pi that I would like to upload and seed to a private tracker but I don't know how to go about creating the torrents on the Pi itself. I can access the seedbox through Deluge on ...
0
votes
0answers
45 views

Setting up the second PWM channel from kernel module not working on RPI 3 model B+

I'm trying to set up both PWM channels (PMW0 and PMW1) on my Raspberry Pi 3 Model B+ from my kernel module. I've successfully set up channel 0 with the desired frequency and variable duty cycle and I'...
0
votes
0answers
29 views

Raspberry Pi 0 W SPI ioctl() call failure

I'm trying to setup my Rasperry Pi 0 to use two SPI ports simultaneously I need such configuration since I need: to connect this board trough ETHERNET to a local LAN; to collect video stream from a ...
1
vote
1answer
16 views

What is the frequency and cycle length of the pigpio library?

I've got a raspi 3b with an esc and a brushless motor attached. I can run the motor using pigpio the following commands: # First start the pigpio daemon sudo pigpiod # calibrate the esc pigs s 12 ...
-1
votes
1answer
49 views

Stepper motor vibrates, does not turn

I´m working on a simple project for school now and I have to use a stepper motor, but it doesn´t turn. The LEDs go on, the motor gets hot and the motor vibrates. When I adjust the sleep/function, the ...
2
votes
1answer
157 views

SIM800 GSM Module To Raspberry Pi UART Serial Communication Problem

I am new to Raspberry Pi Zero and I want to connect it with a GSM module for GPRS connectivity. I bought the SIM800A GSM module but its LED is not even blinking one single time. I am able to turn on ...
1
vote
1answer
28 views

Unwanted extern hard disk 's name changes

I try to make my external hard disk a permanant one on a Raspberry Pi 3 b+. After editing the fstab file, It was working. However I don't know why but some times the hard disk which name is DiskExt/ ...
2
votes
1answer
73 views

Need advice for connecting multiple arduinos to raspberry pi

I have a project in hand where I need to connect 5 arduinos as slaves to Raspberry Pi. Load Cells, Reed Switch, Solenoid lock will be connected to each of the arduino. The arduinos need to send the ...
3
votes
2answers
1k views

Where are the uarts on the raspberry pi 4?

The raspberry pi 4 has at least two uarts (as shown here), I know where I can connect to one of them. Pins 8, 10 and 12 have a uart as an option. Source: This site describes accessing uart1, where ...
3
votes
1answer
61 views

Does directly connecting pins fry the Pi?

As a followup to this question: Can I safely connect two GPIO pins to each other (ie. for testing purposes)? And can I safely connect an input pin to either +VDD (3.3 V) or to Ground? Or do I need a ...
0
votes
1answer
21 views

Remote access SSH with PIVPN on RI3

I have a raspberry3 to my workplace and it is connected to internet by the LAN network. I want to access to the pi-hole interface remotely from my home and by ssh for any configuration on it. I ...
0
votes
0answers
42 views

Issue with I2C communication with raspberry pi and arduino

I am new to I2C communication and python coding so please bear with me if my question is naive or my code looks very bad. I am able to achieve I2C communication between raspberry pi and arduino and ...
1
vote
0answers
39 views

How to set the USB port name in raspberry pi 3?

I'm using 2 ports such as /dev/ttyUSB0 and /dev/ttyACM0, but when I remove one of this ports and put it again, the port's identification changes. How can I force a name to my fisical port in order to ...
1
vote
1answer
27 views

How to fix duplicate console when using TFT monitor?

Using a 2423 PiTFT monitor from Adafruit. Trying to set up my Pi so that it displays a console without auto-login at boot while allowing me to run chromium-browser using xinit. I followed the guide ...
0
votes
1answer
51 views

Pi 4 how to insert and remove usb

I have 2 questions - apologies if they are trivial. a) when I shutdown my pi4 the led goes out but comes back on soon after. Is this ok/ normal? b) I use the GUI and have had a USB stick corrupted. ...
1
vote
2answers
104 views

RPi 4 not connecting to Wifi

I connected my RPi 4 B with Raspbian OS to my home network successfully. After rebooting, it just did not want to connect again. I have re-installed Raspian without any success. It does however, ...
0
votes
0answers
59 views

What does amixer cset numid=3 3 do?

In order to solve missing audio via HDMI with Raspberry Pi 4B (Raspian Buster) I came across amixer cset numid=3 2 which didn't do the trick for me. But randomly I checked numbers from 0 to 4 and ...
0
votes
1answer
71 views

How to install gcc 7 and g++ 7 on NOOBS_v3_2_1 version..?

The preinstalled gcc version on Noobs 3_2_1 is 8.3.0. I would like to downgrade or install 7.4.0 version on it. When i try to run sudo apt-get install gcc-7.4 I get Below error. E: Unable to ...
0
votes
0answers
21 views

Distorted sound using VOIP and ReSpeaker HAT

I am using the ResSeaker HAT on my raspberrypi 3. After installing the drivers im able to record the sounds using the inbuilt mic and play it from my speakers (using the command arecord -f cd -Dhw:1 | ...
0
votes
2answers
51 views

Why are some services only listening on IP6

I have previously asked a question Cannot remotely connect to pigpiod (now deleted) but never resolved the issue. This is a more generic question. sudo ss -lntp State Recv-Q Send-Q Local ...

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