All Questions

2
votes
0answers
33 views

SPI0 and UART0 interference caused by SPI interrupt

I have a raspberry CM3 running a custom Linux version created by buildroot (kernel: 4.19.44-v7). The CM3 is configured to be part of a measurement system that is used on a quad-bike (so a lot of ...
1
vote
4answers
44 views

Pi - own python startup script in the wrong order

I've written a python script to connect to mysql & insert the current time then close. The use case is if my Pi browns out/restarts (often does) the time of this event will be logged. The script ...
0
votes
0answers
10 views

`ircd-hybrid` server doesn't track user's ip address

Story: I have a small IoT project involving inputs from several sensors, one of them is an IPC's hi-res snapshots (I'm using keras's deep learning to repeatedly monitor certain real-world situations ...
-1
votes
2answers
36 views

Reading analog sensor value of 0-10Vdc with 12/16bit resolution

Dear all, I am using below model for reading analog value. I wanted to measure 0-10VDc &0-30Vdc .i wanted use it application where accuracy important. if i wanted to 12/16bit resolution of value ...
1
vote
0answers
33 views

Is it possible to take a picture with the top half of a camera feed, then the bottom half?

Is it possible to take a picture with the top half of a camera feed, then the bottom half? and would it require half as much processing power?
0
votes
0answers
10 views

Is it possible to increase the frame rate of a camera feed by changing the color to 4 bit greyscale?

According to my rough calculation if the feed is only one color ie greyscale it should the camera should be able to take 3 times as many frames per second (reducing from RGB (3 colors) to one (...
1
vote
2answers
38 views

How to create and connect a virtual printer via RS232?

I try to setup my raspberry pi 3 as a virtual printer. My scenario is the following: Legacy System (running Windows 7) -> COM port -> cross-wired rs232 cable -> rpi rs232 extension board for GPIO -...
-1
votes
1answer
24 views

second motor won't stop unless I disconnect power

I am using an L298N board and two pi yellow pi servos and a program on my pi to control everything: # Driving One Motor Using GpioZeo and L298N v0.01 tlfong01 2019jun11hkt1156 # rpi3B+ python 3.5.3 ...
1
vote
2answers
33 views

Setup requirements for multiple i2c sensors

I'm building a project that requires a pi to query multiple 9-DoF IMUs through I2C ( ideally up to 100, but 16 should be enough for the start). I'm wondering if this is even possible and what kind of ...
0
votes
0answers
10 views

My Raspberry not recognize my PI-Camera OV5647

The last time that I worked with my PI-Camera OV5647 all was perfect the camera worked well, but now i try to do a preview but the camera is not recognize by the Raspberry Pi and shows me the error: "...
0
votes
2answers
47 views

What is the most apt way to setup a RTC?

I've gone through a plethora of sources and found it a little confusing with too much information hence posting this question. Firstly, the scenario is, I've set up my PI-3B(jessie) with PCF8523t RTC....
0
votes
0answers
11 views

Pi zero USB OTG Connected to Linux OS PC suddenly halt during package getting via internet

I am trying to built native QT into my raspberry Zero via USB OTG connection to my Linux OS PC based of this site instruction. So when i inserting this codes: sudo apt-get install build-essential ...
0
votes
0answers
12 views

How can I use pm2 to start homebridge in debug mode?

I've been trying to debug an issue where all my homebridge devices get stuck in a "Updating" status (according to the Home app) for 15 to 30 seconds occasionally. Initially, I tried starting ...
0
votes
0answers
21 views

Need help on how to apply arcade kit commands in Python code

I'm using Python on my Raspberry Pi to code some games for my high school finals project, and I want to play them with a arcade kit (Game DIY Arcade Set Kits Replacement Parts USB Encoder to PC ...
0
votes
1answer
22 views

Execute a script on startup in latest NOOBS OS - Raspberry - Pi 3B+

Actually I have went through this stack answer and followed the 3rd Type for running the script on startup, and It works like a charm for previous version of NOOBS. Today I downloaded the latest zip ...
0
votes
1answer
15 views

How to get SSH access to headless Raspbian Stretch Lite? Official way seems not to work

I was not able to enable ssh by putting the file into the boot folder, and yes it was created without extension from a Windows 7 machine and gets deleted after boot. This is what should have happened:...
0
votes
0answers
19 views

LCD Installation freeze because of low voltage?

i try to install my LCD 3.5 waveshare, but when extracting the folder and use sudo ./LCD35-show it starts shortly and then freeze. I Got the thunder icon and the freezed screen. Might this be the ...
1
vote
1answer
36 views

USB3 drive and Pi Zero

I'm trying to connect a 3.5" drive to a Pi Zero. However, the drive is not detected by the Pi: pi@lolcat:~ $ dmesg | grep sd [ 0.913523] sdhci: Secure Digital Host Controller Interface driver [ ...
-1
votes
0answers
17 views

Running wpa_cli reconfigure disconnect from internet?

I have configured my raspberry pi as wifi to ether dhcpcd.conf # A sample configuration for dhcpcd. # See dhcpcd.conf(5) for details. # Allow users of this group to interact with dhcpcd via the ...
7
votes
2answers
92 views

Why is grub incompatible with the raspberry pi?

I've read numerous times that the raspberry pi doesn't support grub. I've not been able to find any specifics about the incompatibility. I've only found rather blunt statements of the form "it's not ...
1
vote
1answer
13 views

ALPR on Raspberry Pi [closed]

I'm looking to do a quickie - that is, a simple project for ALPR on the Raspberry Pi. I would prefer to have the ALPR engine on the Raspberry Pi so that I don't have to send images over to the cloud. ...
1
vote
2answers
37 views

Driving 12V/24v Relay from raspberry pi

I am trying to drive the 12V/24V relay using Rasberry pi 3. I have got schematic from one of the forum.I have question related to below schmatic. 1) The ckt build to drive 5V relay . How can use ...
2
votes
1answer
38 views

raspberry pi serial communication function (serialdev)

I'm working on a radar project and I want Matlab to send commands and collect radar data remotely from the USB port of a Raspberry Pi 3 B+. My setup is as follows: I have the radar connected to the ...
0
votes
0answers
12 views

Sim800L stops responding after working 10-12 days, after that it needs power reset

Sim800l is not responding anymore after a few days of continuously working and requires restart/reset. It won’t recover by itself or respond to any commands unless a restart or power off is made. If I ...
0
votes
0answers
30 views

Raspberry Pi 3 B+: Many video devices are showing

I attached two webcams to RaspberryPi 3B+ using USB power hub. But when I wrote ls -la /dev/video* in Terminal, output shows many video devices as shown below: crw-rw----+ 1 root video 81, 0 Jun 7 ...
1
vote
1answer
62 views

motor won't stop

I built a buggy: https://projects.raspberrypi.org/en/projects/build-a-buggy/2 it seems like it works correctly, except the motor doesn't stop even when I run robby.stop() is there some other command ...
1
vote
0answers
17 views

Raspberry pi zero as keyboard controlled over wifi possible?

Hello I want to have a pi zero W create a wifi hotspot(no internet connection). I then want to connect to the wifi hotspot and ssh into the pi. From there i want it to send keystrokes as a HID ...
1
vote
0answers
18 views

SPI Display – fbtft connects to wrong frame buffer

Today I installed an SPI display to my pi. I'm using fbtft and follow the wiki. I don't want screen mirroring, but force the SPI display to be a secondary monitor. I discovered, that fbtft connects ...
-1
votes
0answers
22 views

Download rpi-update file (rpi-4.19.y Linux tree ) manually

i need to cross compile qt for raspberry pi zero via USB OTG with my Linux LMDE based of this site,so first step based of this site is to do : sudo rpi-update but my pi internet connection failed ...
1
vote
2answers
21 views

Run tkinter gui on remote machine connected by SSH?

I would like to run a tkinter-generated GUI generated on a Raspberry Pi while connected via SSH on a Mac. I have tried several suggestions (e.g. https://stackoverflow.com/questions/37604289/tkinter-...
-1
votes
0answers
28 views

Raspberry Pi Zero simultaneous robot control

I'm making a robot project, where I have 4 servos (2 driving and 2 steering) and 2 separate brushless motors. My intention is to be able to drive and steer the robot, while the 2 BLDC are spinning at ...
0
votes
0answers
19 views

How would I repeat a mouse's USB signal, but also being able to modify the signal?

For an upcoming project, I need to make a mouse repeater for a Raspberry Pi, but I also need to be able to modify the signal. I need to be able to send certain button clicks from a script. Any ...
0
votes
1answer
20 views

Boot's cmdline.txt and config.txt files changed after install new package in rasbian at pi zero (USB OTG Connection)

I am using raspberry zero with USB OTG to my linux LMDE based this instruction , so when i install something like lcd 5inch driver, the files which changed in the boot's SD card folder. and the files ...
0
votes
0answers
10 views

Suddenly halt when updating the raspi zero

I am updating the raspi zero (sudo apt-get update)via USB OTG Ethernet via my laptop internet but suddenly my terminal which connected to raspi zero hang and don't respond you could see in this pic ...
-1
votes
1answer
30 views

mpiexec with mpi4py not executing on startup raspberry pi

I have a python programme that works out primes that I have set up with mpi4py, for it to run on my raspberry pi cluster, and I can normally run the command from any directory but when I put it in rc....
2
votes
1answer
36 views

Raspberry pi 3 RFID RC522 Card UID is not same with USB RFID Reader

I'm working with RFID RC522 using Raspberrypi 3B+. I'm following https://github.com/mxgxw/MFRC522-python this package and works like a charm. I can able to read the data from the card, able to write ...
-1
votes
1answer
37 views

Pi Camera detect almost full black image

I'm capturing images using picamera and I need to detect when the sensor is covered by a hand, so almost full black image. what is the easier way to do that in python?
2
votes
1answer
57 views

Opencv VideoCapture much faster than PiCamera

I am trying to process frames from my V2 RPI Camera at high framerates and am stuck with the picamera module. The VideoCapture class from OpenCV seems to be much faster than using PiCamera....
1
vote
0answers
39 views

Qt cross compilation *QOpenGLShaderProgram: could not create shader program* error

I am using the QT Creator for my laptop (Linux LMDE 3 Cindy OS) And for Raspberry Zero Cross-compiling. I have installed the QT based of this instruction and by this setting: mkdir ~/raspi ...
1
vote
1answer
24 views

Web server rpi ip address

I have a program in var/html/ and when I connect to it locally I can see it. I wondered how can I connect to it from the internet like a website. I already looked on google but did not find anything. ...
0
votes
0answers
21 views

Using the PI to make a standalone synth with a midi keyboard

I have an unused midi keyboard collecting dust in my closed, and was thinking to connect on it a RPI 3B with a small LCD screen, to use it as standalone synth. Currently I am running a 2 GB setup, ...
1
vote
2answers
30 views

Can't exit my apllication in a clean way

Not sure if my problem is related to RaspberryPi, GPIO or just my understanding of Python but since I'm detecting my problem while playing with a button attached to my PI I ask it here. I have a ...
1
vote
1answer
29 views

Rpi Webrtc echo cancellation - aec

I am using Rpi-Webrtc-streamer for webrtc on raspberry pi with usb sound card connected to audio amplifier for speakers and electret microphone. I am able to run webrtc correctly but with issue of mic ...
0
votes
0answers
19 views

My Raspberry Pi disconnects from the Wi-Fi network randomly

I am experiencing an issue related to wifi network sleeping or disconnecting, that has been persisting despite trying this methods: Changing the power management setting to off using iwconfig wlan0 ...
1
vote
0answers
19 views

sudo apt-get update isn't working / networking problem

I am getting following errors repeatedly upon using apt-get update command : pi@raspberrypi:~ $ sudo apt-get update Err:1 http://raspbian.raspberrypi.org/raspbian stretch InRelease Cannot ...
1
vote
1answer
19 views

How to control computer fans with GPIO

I want to build a smart air conditioner with my Raspberry Pi 3b+ by using these PC Fans: https://www.amazon.de/Arctic-F12-PWM-PST-Geh%C3%A4usel%C3%BCfter/dp/B00NTUJTAK/ref=cm_wl_huc_item. What is ...
5
votes
2answers
107 views

Pin powered Pi crashes when servos move

I have been working on a circuit to power a Raspberry Pi and servo(s) from a single power source. The diagram below shows the basic configuration, although the 'AA battery' is actually two 18650s. ...
0
votes
0answers
31 views

Cant upgrade Raspbian neither run Python

I am trying to upgrade my Raspberry Pi 3 B+: $ uname -a Linux plexmediaserver-pi 4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv7l GNU/Linux But I am getting this weird error: pi@...
2
votes
1answer
30 views

What's the layout of the official Raspberry Pi keyboard (GB)?

I bought one from the Pi Hut (with a GB layout). I made the mistake of changing keyboard layout to generic 105 keys and now nothing at all happens when I type. Nor does the mouse, which is plugged ...
0
votes
0answers
27 views

vlc aspect ratio instable

on the same hdmi monitor, the screen aspect ratio of a movie changes when switch to full-screen. HOW TO MAINTAIN THE SAME ASPECT RATIO BETWEEN FULL-SCREEN OR NOT ? Raspbian, PI 3 B+ VLC media ...

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