Questions tagged [python-3]
Use this tag when referring to the Python 3 language. This can include discussions about specific features unique to the language or perhaps when referring to software that requires Python 3 in order to function. Note that general programming questions are often better suited to Stack Overflow; use this tag only where directly relevant to the Pi.
299
questions
0
votes
1answer
5 views
Reliable temperature/humidity logging with Python and a DHT11
There are more than 100 questions on this site concerning DHT11 or DHT22 sensors and I have used these with Python and c code using various libraries.
None that I have tried seem to give reliable ...
0
votes
0answers
10 views
How to Type Unicode Characters
I want to show if a code is locked or unlocked and a fun way I thought of would be to use a unicode character. How would I type Unicode characters such as “🔒” (U+1F512), or is that beyond the pi's ...
0
votes
0answers
17 views
Raspberry Pi 3B+ successfully connect and pair but can't receive data from OBD II
Hello guys my problem is i cant recieve any data from OBD II to Raspberry Pi 3B+
Here the materials that i use:
Raspberry pi 3B+
ELM327 -> OBD II
Operating System of Raspberry Pi -> https://medium....
0
votes
0answers
14 views
Nano Color Syntax for Python3
Currently if I use nano to edit a file with a .py extension nano will recognize it as a Python file and will color the syntax, but for Python 2. Is there anyway for nano to color syntax to Python3 ...
0
votes
0answers
12 views
Can't get OpenCV up'n'running in Raspberry Pi, what should I do? (details in the description)
I followed the whole tutorial (https://www.deciphertechnic.com/install-opencv-python-on-raspberry-pi/) line by line, but at the end when I imported the OpenCV library in Python CLI, it gave this error:...
0
votes
0answers
36 views
How do I read all registers of an INA219 sensor via SMBus in Python at once?
I'm trying to Connect my Raspberry Pi 3B+ with a Raspbian 10 to an INA219 current sensor (that also returns voltage and a premultiplied power) via SMBus in Python 3.7. After destroying one Raspberry ...
0
votes
0answers
9 views
how covert pyaudio sample rate 44100 to 16000 sample rate in Raspberry pi3 b+
Here I have provide the code which was working properly before but suddenly its stop working. But if I change the sample rate 16000 to 44100 its working. But i am not able to understand what exactly ...
-1
votes
0answers
31 views
How to run a python3 program automatically in Raspberry pi 3 - Raspbian Jessie?
Good morning, I'm trying to run a program automatically When the Raspberry log in and shows the desktop, I'd already run a program following this tutorial: https://www.raspberrypi-spy.co.uk/2015/02/...
1
vote
0answers
38 views
imutils VideoStream(src=0) return VIDIOC_QBUF: Invalid argument in raspberry pi
I am only doing a simple code in my Raspberry Pi 4:
from imutils.video import VideoStream
# initialize the video streams and allow them to warmup
print("[INFO] starting cameras...")
webcam = ...
1
vote
3answers
53 views
Reboot not starting python app but executing runs with no Errors
I'm running a bell app connected by ENet between two RPI 4.
The button end works well, but the server end only works when I sign in to activate it. How do I get it to start at start-up in Crontab?
@...
1
vote
2answers
52 views
AdaFruit ServoKit CircuitPython Blinka Library Installation Problem
I'm follow along with a tutorial to get started with using CircuitPython to control servos on my RaspberryPi (https://learn.adafruit.com/adafruit-16-channel-pwm-servo-hat-for-raspberry-pi/using-the-...
0
votes
1answer
48 views
Desire line mapping with Raspberry Pi and Python
Desire lines normally refer to paths created by humans as a result of excessive use, as that path is the most efficient form of transportation. So if I mount my Pi Camera looking at an intersection, ...
0
votes
1answer
34 views
Raspberry Pi 0 W spontaneous event triggering for an input pin
I have two "Cylewet 25Pcs AC 1A 125V 3Pin SPDT Limit Micro Switch"-es that are normally open and connected to two of the Pi pins with internal pull up resistors.
Left unattended, they call ...
2
votes
2answers
69 views
How to automatically rerun python script if error occurs
I have python script which ideally runs indefinitely in loop. I am catching some exceptions, however, the problem is when some error occurs and script stops because of error. I want to detect somehow ...
1
vote
2answers
38 views
Installing Python 3.6: question about needing sudo command for configure command
I have a Raspberry pi 3 Model B and I want to install Python 3.6 on it.
A bit of context:
I acquired this Raspberry pi over 2 years ago and it came with Python 2.7 and 3.4 installed by default in /...
0
votes
1answer
21 views
Invalid syntax when setting variable
When setting variable c1, it shows invalid syntax error on c1
def project(k, n):
h = 200
L = 18
M = 70
da = 8
xo = h - L
g = 9.81
V0 = m.sqrt(2 * g * L)
W = M * g
xss = -(W / k) + h ...
3
votes
2answers
36 views
Executing 2 commands in 2 different Terminal windows
I want to execute 2 python programs(both run flask servers on different ports) in 2 different terminal windows, from a single bash script.
Python files: a.py and b.py
Bash Script: runner.sh
This is ...
0
votes
0answers
29 views
Awful Color Saturation in Datlight using pi-camera
I decided to finally post this after no avail and several videos that are unusable. I made a python script to record and convert video from a raspberry pi running in the nosecone of my rocket. However ...
1
vote
2answers
62 views
What system libraries are required to support Pillow on Raspbian Buster Lite?
After installing Pillow, I get errors such as:
>>> from PIL import Image
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/pi/env/lib/python3....
0
votes
0answers
23 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 ...
1
vote
0answers
33 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 (...
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 ...
1
vote
2answers
70 views
Tkinter not running on updated python
So, I'm trying to use a project, that uses tkinter on my Raspberry Pi but I have an issue.
I needed an updated version of Python, so I updated it to 3.7.4, however, when I try to import tkinter, it ...
1
vote
2answers
55 views
Callback parameters to GPIO.add_event_detect?
I have a button object that when pressed needs to perform something, and for this I'd need to get a property of the button. I'd like it to work like:
...
GPIO.add_event_detect(button, GPIO.RISING, ...
0
votes
0answers
19 views
mbus to modbus protocol
Im trying to convert mbus protocol to modbus IP protocol with a raspberry.
Im new on this, just doing bcs my boss asked. I´ve been searching on all google, but I found nothing. Any help would be ...
0
votes
1answer
64 views
Desktop no longer displays after modifying LXDE-pi autostart
I upgraded to Raspbian Buster this morning and everything worked fine, until I added a command to run a python tkinter application in the LXDE-pi autostart file. When I rebooted to test the tkinter ...
1
vote
1answer
162 views
Selenium won't run on my raspberry pi 3 Model B+
Today I recieved my Raspberry pi 3 Model B+. I downloaded NOOBS and installed it on my raspberry pi. However, I cannot run a selenium browser on it. I have tried to install iceweasel but it says that ...
0
votes
2answers
69 views
Does gpiozero need RPi.GPIO?
I'm trying out gpiozero, but after running the examples from their documentation, I still get this errors but it still runs ok.
gpiozero is installed on venv using pip3
#!/usr/bin/env python
from ...
1
vote
1answer
62 views
Can I just create a python thread per raspberry pi for parallel processing?
I have been looking to make a cluster of raspberry pi 4s, and have been pretty interested in it and made good head way. I have seen quite a few guides on the topic as well. I followed this one found ...
2
votes
0answers
69 views
Hardware controlled RTS on a Pi4 not working accurately
We need to use RS485 to talk to one of our custom tools. We need to use hardware controlled rts/cts. I've read so many articles about this but nobody ever says it works for them with fast timing and ...
1
vote
1answer
95 views
Cannot install pandas on Raspberry Pi
I have been trying to install pandas for a week now. Read pretty much every thread I could find but nothing seems to work. I keep getting a ton of import and dpkg errors every time. Everything is up ...
0
votes
1answer
39 views
Running script after reboot does not work
I have a simple script will runs a loop that reads off temp data in the console from a sensor and then writes it to a file. I would like to make sure that this script starts running right after my pi ...
2
votes
0answers
67 views
Waveshare ADDA (ADS1256) full scale input issues
My question is about a problem of full scale output with the Waveshare ADDA ADS1256 card.
I use the Waveshare High-Precision AD/DA Board based on ADS1256 on a Raspberry Pi 3b and the Python3 examples....
1
vote
0answers
25 views
Schedule Video Recording
The code below records video for 24 hours straight which is too much. I wanna schedule the record like from 9.00am to 3.00pm only 6 hours of video. Being a novice and newbie I don't really know how to ...
0
votes
0answers
55 views
Speed drops in for-loops python on rpi
I am working with python 3.5 on rpi 3B+ and making a led matrix project. For that I would like to know at what speed my code is running each cycle. I will take the minimum and use that as a refresh ...
0
votes
1answer
27 views
spidev sanity check not working
ArchARM on Raspberry Pi 3, spidev installed from AUR.
I'm trying to control a Waveshare device via SPI, and can't get SPI to work from Python.
The most basic sanity test I can think of is failing:
...
-1
votes
1answer
92 views
Need a large (20 inch +) touch screen monitor Raspberry Pi 3b+/4b running Debian Buster
I'm looking for a large (20 inch +) touch screen monitor for Raspberry Pi 3b+/4b running Debian Buster. We tried the ViewSonic TD2230 but the driver support is lacking; Tkinter misses about 35% of the ...
0
votes
0answers
34 views
HC-SR04 Ultrasonic Rangefinder readings are off by a large margin
I'm making a robot that should avoid obstacles and im using a HC-SR04 to measure distances. My problem is that my readings are off by a large margin. when there is no obstacle in the way I get a ...
1
vote
0answers
27 views
I don't know why suddenly mjpg-streamer and webcam stop working
I have made a program that uses three webcams and three ultrasonic sensors using raspberry pi 3 and python 3. When each ultrasonic sensors detect stuff in front of them, webcam take a picture of it. ...
0
votes
2answers
20 views
Generating Stereo Audio in PI programmatically
I want a stereo output form the PI. The sound being played will not be a recorded sound rather it would be generated using a code (preferably python). For example, the program's input will be (x,y,z) ...
0
votes
1answer
39 views
Connecting pihut controller to pi zero. Syntax error when calling a script
Please let me know if I should provide any more information.
I'm trying to connect a pihut controller to a raspberry pi zero using code I found from approxeng. I am running python 3.5.
https://...
1
vote
1answer
174 views
No module named 'adafruit_circuitpython_servokit' [closed]
I have a Adafruit PWM hat and I am trying to run play around with some servos. However, when I run this line:
from adafruit_servokit import ServoKit
It returns:
No module named '...
-1
votes
2answers
67 views
How can i convert a python script into a Raspberry Pi 3 (Raspbian) executable?
I'm designing a GUI for my Raspberry Pi 3 B+. I've written the code in Python3.5 and now I want my script to be run as executable (Raspbian package).
Is it possible to do so and if possible any ...
0
votes
0answers
23 views
Could I use Processing.py to display text and shapes on a Waveshare ePaper display?
I am new to Raspberry Pi and programming in general. I have very basic knowledge on Processing.py and I would like to know is it possible I could use this library to display shapes and text on a ...
0
votes
0answers
49 views
Packages are correctly installed using pip3 in my virtual environment but are not being imported, I get ModuleNotFoundError
I am using a raspberry pi 3 with raspbian buster and python 3.7.3.
I can install packages fine in my virtual environment using pip3 install. This can be seen when I use the command pip list, all my ...
0
votes
1answer
54 views
MGR996R rotation angle
Basically I want to control the angle of the rotation of the servo motor but I don't seem to know how...
From the tech sheet I know this motor shouldn't be a continuous one, any hint would be ...
0
votes
0answers
8 views
Can I save and open multiple videos with OpenCV or any other module/package/method
So, I have been working on a project which requires me to open an animation/video if the user gives an input of a recognized string mentioned in my code. Basically if the word entered by the user is ...
0
votes
0answers
47 views
How to Volume control PAM8610 from RPI
Does anyone know how can I control PAM8610 module volume through code from RPI?
Thanks.
1
vote
0answers
32 views
softly increasing and decreasing volume with mpg123
I am using Picroft on raspberry pi 3. In picroft, every mp3 files run with mpg123. I am creating my own device using this OS. when I say it to sing a song it starts singing by playing mp3 files and ...
0
votes
1answer
71 views
Simulating OpenCL on a Raspberry Pi using Python
Is it possible to run code on a Raspberry Pi which simulates the use of OpenCL?
I am developing code on a computer which is capable of using OpenCL, and am testing this code remotely on a Raspberry ...
