Questions tagged [python]

Python is a general-purpose, dynamically typed, object-oriented high-level programming language. Interpreters for versions 3.x and 2.x come installed on the Raspberry Pi's most popular operating system distributions.

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1answer
645 views

Rasberry Pi zero and 3 bluetooth transfer speed is slow RFCOMM

I am trying to send a series of bytes from the Raspberry Pi zero W to the Raspberry pi 3 via bluetooth. Im using the PyBluez python package. I believe that Raspberry Pi Zero has Bluetooth 4.1 and ...
4
votes
1answer
326 views

How to make sense of this Raspberry Pi project guide for building a theremin?

I have just started out using a Raspberry Pi, and for my first project, I wanted to build a pseudo theremin using an ultrasonic motion detector and other electronic components (requirements are laid ...
4
votes
1answer
513 views

Started picamera.start_preview() in Raspbian but don't see anything

I started picamera.start_preview() in Raspbian but I don't see the preview window which I thought was supposed to appear. import picamera cam = picamera.PiCamera() cam.start_preview() <picamera....
3
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0answers
155 views

Problem sending analog read values over serial

Ok I apologize as I have edited this quite a bit, but I have narrowed down the problem a bit more. For some reason I can't transfer values from my arduino analog pins?? I am trying to send values ...
3
votes
1answer
218 views

Sending a binary data stream to a GPIO at a certain frequency

I would like to send a random binary data sequence to a rpi GPIO at a particular frequency and then read the data stream off a scope. Is there a way of implementing this through python?
3
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0answers
127 views

ADXL345. Bits, resolution and g's

I have a Kistler type 8921 which produces 1g (10m/s2) RMS (at 159 Hz). The ADXL345/Raspberry Pi 3 setup should produce similar g's, but currently doesn't. As can be seen, it is not just about a ...
3
votes
1answer
464 views

Is it possible to connect a Minecraft Pi Edition Python script to a specific active game window?

Is it possible to connect a Minecraft Python script to a specific active game window when multiple game windows are currently open? For example, I have three different open games on one Raspberry Pi ...
3
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0answers
626 views

RPI 3B and Tiny Thermal Printer - Unable to use python library

I'm having trouble hooking up my Raspberry Pi 3 Model B to my Adafruit Tiny Thermal Printer (nb: not the mini thermal printer - this is the one with a mini-USB port built in). I've got it connected ...
3
votes
1answer
972 views

Not getting a response from a connected PIR sensor

I have a PIR sensor which I'm using connected to a Raspberry Pi 3 Model B as part of a Magic Mirror project. I'm running this module for the sensor. I've had the Motion Sensor working before, but now ...
3
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0answers
593 views

RPi.GPIO autocompletion

Is there any way to have auto-completion when working with the RPi.GPIO in Python? I don't see it having any Python sources that could be used for it. I'm using IntelliJ IDEA, which uses PyCharm's ...
3
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0answers
2k views

Raspberry Pi 3 Bluetooth Baud rate

How do I increase the available baud rate of the bluetooth module for the Raspberry P1 3 model B? I have tried editing the /boot/config.txt file with: init_uart_baud=1000000 init_uart_clock=16000000 ...
3
votes
2answers
16k views

Raspberry PI GPIO not working

I just got a raspberry pi 3 B+ model and have wrote some scripts to create an LED pattern. Everything worked and then suddenly stopped. Now every time I run a python script through sudo python #...
3
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0answers
383 views

Speech Recognition ERROR

I am using a speech recognition library on a Raspberry Pi in Python that I found here and I installed it through pip. I also had to install Pyaudio of their site here. Pip would not work for Pyaudio ...
3
votes
0answers
3k views

Jack server not working on Raspbian

I wrote a little python app (using PyDub), that plays sound files. Everytime I run it, I get the these errors: ALSA lib pulse.c:243(pulse_connect) PulseAudio: Unable to connect: Connection refused ...
3
votes
0answers
632 views

Running two cameras at the same time (Pi Camera & USB camera)

I would like for my project to have one camera (PiCamera) Streaming video. And another USB Camera (PS3 Camera) taking pictures when I execute this function: def grabPicture(self): grab_cam = ...
3
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0answers
282 views

Slice of Radio and Ithobox

I've got a Raspberry Pi with Ciseco Slice of Radio and I'd like to control my Ithobox LINK It has an 868 Mhz RF transmitter/receiver and I also have the optional RF remote control unit which I'll be ...
2
votes
0answers
47 views

Sending an image from Pi Camera continuously to a display

I want to send 6 images per minute from the Pi Camera continuously to any display. Like for say I have the camera that is at my house but I want to send the images to my work computer. The end goal ...
2
votes
0answers
50 views

Raspberry Pi Jsch Diconnect Handler

I am using Android Studio "Jsch" package to connect my Android Device to my Raspberry Pi via SSH. The Event "on press" sends a command,which executes a Python file on my Raspberry Pi. This File turns ...
2
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0answers
13 views

Error opening InputStream USB Microphone and Raspberry PI3B+

I am trying to use a USB microphone with python sound device and raspberry pi3B+. When I execute the script in the console typing $ python3 sound.py it runs and records all ok. But when I try to ...
2
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0answers
43 views

Using Motion to Post Photos Captured to API

I am attempting to build a program that will automatically post the photos taken by motion from my usb webcam to a rest API, and have ran into some problems. My livestream works correctly, and it ...
2
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0answers
174 views

picamera: capture a frame while continuous capture in background

I'm capturing a timelapse with the picamera module for python: def capture_thread_task(self): filename = os.path.join(self.SAVEPATH, self.safe_camname + '_{timestamp:%Y%m%d-%H%M%S}-{counter:03d}'...
2
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0answers
26 views

Permanent Arduino usb address on RPi!

So my project is using to Arduinos slaves to RPI that is master. They communicate through USB. Each time I remove one of the Arduinos I need to modify the .Py script to add the new USB alocated. Is ...
2
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0answers
34 views

PWM on pump not working as expected

I am attempting to run a PWM on a pump using rpi.GPIO using the following code: def run_PWM_on_pump(): gpio.setmode(gpio.BOARD) gpio.setup(8, gpio.OUT) p = gpio.PWM(8, 0.5) #also works at ...
2
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0answers
40 views

Adafruit OLED (128x64) display very dimmed?

I bought the Adafruit 128x64 OLED Bonnet and tested it with the demo program. Unfortunately the luminosity is very low and it is not satisfying: I have tried to adjust the contrast from 0 to 255 but ...
2
votes
1answer
180 views

Showing an image on screen attached to Pi via SSH

I am running a raspberry pi3b+ via ssh. There is a hyperpixel4 screen by Pimoroni attached to the Pi and it's working fine. I am trying to display an image on the screen attached to the Pi with a ...
2
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0answers
69 views

Safe cut power supply from raspberry

I want to cut safe the power supply from the raspberry with a relay connected to the gpio. I know how to connect to relay to the board but.. When the relay turn off the power line will be cut off to ...
2
votes
0answers
60 views

PICamera white balance difference between preview and capture

Below is a screen shot of the preview and the captured image of the same scene taken from a single PICamera at the same time. As you can see the one on the left (the capture) is noticeably bluer than ...
2
votes
0answers
39 views

efficiency of python sleep function to set a raspi pin HIGH and pause the script

I am continuously measuring some parameters using Raspberry Pi. I am using Python. When the measured value is higher than a particular value, I want to set a GPIO pin high (for some LED indicator) and ...
2
votes
0answers
148 views

Control on-board led triggers from python

I know the trigger for on-board leds can be controlled from the command-line (or a script) I have a python program that I want to temporarily take over the system led blink it a little and return ...
2
votes
0answers
392 views

Threading on Raspberry pi Serial Port

I have multiple Raspberry Pi(RPis) using which I have to send data (wireless,using Long Range modules connected to TX RX of RPi) on just one Rpi. All the RPis(Ones sending data) use different ...
2
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0answers
162 views

Detecting “No Mouse Movement” in python on Raspberry Pi

So this is going to be a bit confusing but using a basic loop i can detect keyboard and mouse inputs using the following: globals()['keyboardEvent'] = evdev.InputDevice('/dev/input/event0') globals()...
2
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0answers
147 views

Need help with Controlling WS2812B LEDS

I have made a 5 x 5 WS2812B RGB LED matrix to work with my raspberry pi. I'm trying to figure out how to run several tests from this tutorial: https://tutorials-raspberrypi.com/connect-control-...
2
votes
1answer
177 views

Rpi Zero W - How to automatically accept bluetooth pairing and log mac and info request?

I am using Raspbian Stretch 9.4 on a Zero W. The goal is to deploy it headless for long periods of time where it will broadcast a specified bluetooth signal. When someone tries to connect to it, it ...
2
votes
0answers
524 views

Send alert message to telegram from Raspberry Pi

I am currently working with an IR sensor for paper shelves. When the sensor detects no paper, it will turn the LED light on. at the same time, it will send an alert message through Telegram for the ...
2
votes
3answers
937 views

Connecting multiple load cells Pi Zero W to read individual values

I have a project in mind where I want to measure the weight and position of an item on a shelf. The idea was to mount the shelf on a load cell in each end and then get the weight and ratio between ...
2
votes
1answer
505 views

SPI only returning zeros with Raspbian (It works with IoT core)

I am using this ADC connected to the channel 0 of my Pi3 board for reading values from a sensor. In IoT core, I was using a very simple code for testing the my device, and it worked fine. The C# code ...
2
votes
0answers
716 views

Permission Denied as root when connecting BluetoothSocket with Bluez 5.43

I've been trying to get bluetooth working on my Raspberry Pi 1 Model B+ running Raspbian Stretch Lite 4.14 with a 3rd party USB bluetooth dongle. I installed Bluez 5.43 for python 2.7, and was able ...
2
votes
1answer
71 views

fork() Process Issue on Channel Switching via Rotary Encoder

I have KY040 rotary switcher(encoder) as shown below picture. It is the scenario that there are 5 radio stations(simple html url) in urls.txt which are read into stations list in radyoCS.py, at every ...
2
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0answers
995 views

Illegal instruction when running python on raspberry pi

I was doing a pi project where pi communicates with a UHF ID card reader via hardware serial and read cards. Pi gets the card information through serial and upload them to a remote database. Also some ...
2
votes
0answers
3k views

How do I test if my UART port is working? Simple example… loopback-test

I am working on a NMEA(GPS)-datalogger for a drone. I followed the tutorial from fishandwhistle and createt this script: #!/usr/bin/python3 import os, time, sys, glob, datetime, syslog, pynmea2, ...
2
votes
0answers
1k views

RPi camera stream to OpenCV in Python

I have been searching everywhere and tested what seems to be everything in order to get OpenCV in python to accept a video stream through gst-launch-1.0 from a RPi camera connected to a RPi. So far, I ...
2
votes
1answer
613 views

USB audio from Pygame

I am running Raspbian Stretch. I've connected a USB sound device and selected it through the graphic interface. This sends the sound out fine from youtube in Chrome but is silent with a Python ...
2
votes
0answers
2k views

Segmentation fault, running out of memory? PyQt5

I am programming code to display camera feed with my raspberry pi 3 and Raspbian. Strangely, sometimes the code shows the video and sometimes i get the Segmentation fault error. I used gdb to find ...
2
votes
1answer
630 views

Raspberry Pi 3 & Arduino: [bluetooth.btcommon.BluetoothError: (112, 'Host is down')]

I am trying to send informations from Raspberry Pi 3 to Arduino Uno with bluetooth. I managed to connect the Arduino's bluetooth module with the Raspberry Pi. But I have this error when I execute my ...
2
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0answers
1k views

High speed photography using RPi Camera module

I'm trying to capture high speed water flow movement in a small dark chamber with a cool white 5 W high power LED as a flasher. My target is to achieve quick exposure using 0.8 millisecond light pulse....
2
votes
0answers
115 views

How to manually adjust system clock for testing purposes

I have written a Python script that is set to run different functions at different days/times. I would like to test it by setting the system clock to 1-2 minutes before the dates/times that the Python ...
2
votes
0answers
92 views

Crontab + LCD display strange behavior

I have my Raspberry Pi hooked up to 16 x 2 character display the date on launch. The display has a i2c module on the I have placed this in crontab (without the sudo thingy, so user) : @reboot ...
2
votes
1answer
280 views

Button isn't triggering in python script

Software guy here, first time doing hardware. Here is my breadboard setup (yellow is GPIO-8, green is ground): Here is my Python: import RPi.GPIO as GPIO from time import sleep GPIO.setmode(GPIO....
2
votes
0answers
285 views

GPIO Edge detect setup on 3 pins, when one changes all callbacks are called

I have a PI setup with 3 sensors (reed switches) and 2 "outputs" to a relay. They are on pins (8, 10, 12) I have pin 3 setup to drive the first relay and pin 5 setup to drive the second relay. I ...
2
votes
0answers
264 views

How to use PC Joystick from Raspberry PI via TeamViewer?

I've installed TeamViewer 11 Host in my Raspberry PI 3 and I can access my Raspberry PI by using the TeamViewer. But the problem is that, I can't access my Joystick that is connected in my PC from ...

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