Questions tagged [rpi.gpio]
rpi.gpio refers to the package name of a Python module for accessing the Raspberry Pi's GPIO pins. The module allows GPIO pins to be initialised, turned on, and turned off. It uses a functional programming style.
680
questions
-1
votes
1answer
38 views
need to avoid callback is triggered when changing gpio modes
I have following code and I need to run it so, callback is not triggered when changing gpio mode from OUT to IN. Is this manageable with this library?
import pigpio, time
_gpin_a = 27
pi_gpio = ...
0
votes
0answers
30 views
Raspberry Pi Pin 17 Displaying Abnormal Behavior
I found that GPIO 17 (there was a switch wired up to it) had abnormal behavior.
I have wired up a hall effect sensor on pin 18, but when it goes low (it is high when not detected, low when detected), ...
0
votes
1answer
33 views
Raspberry pi zero GPIO pin not detecting Input
so I am using a raspberry pi zero to detect the signal from this NPN Inductive proximity sensor(its input supply range is 6to36V and the signal pin to output the same amount of Voltage which we give ...
4
votes
2answers
358 views
Error installing RPi.GPIO in virtual environment
I am trying to create a virtual environment that can access GPIO pins. In order to do that, I need access to RPi.GPIO in the environment. I am unable to install that into the virtual environment. I ...
1
vote
0answers
35 views
MCP23008 Python Input Handler
How do I declare a Python callback handler method on a MCP23008 input pin?
This Adafruit tutorial, which uses CircuitPython shows how to read input from the extended GPIO pin on the MCP23008, but does ...
1
vote
1answer
228 views
Bullseye python2 RPi.GPIO
As I read from forums, Python2 is removal at bullseye. I install python2.7 manually but there is gpio problem with python2.
sudo python2.7 -m pip install RPi.GPIO
dont work. Raises
collect2: error: ...
0
votes
1answer
45 views
Is it necessary to ground GPIO's?
this is apost that I had on general stack, but was told to move here. Sorry if this is duplicate.
I have made a simple relay board using a 12vdc Bosch automotive relay. The relay works great, Comm/NO ...
1
vote
1answer
62 views
Raspberry PI GPIO protection
I'm designing a PCB to mount and interact with a raspberry pi4. One of the things I need it to do is drive a 24V relay. This circuit has worked great with some controllers I've used where the outputs ...
-2
votes
1answer
35 views
GPIO Runtime Error with cron script at reboot
On my Pi I am using cron to run a shell script, which in turn runs a python script on startup using the @reboot flag. This python script sets up a GPIO pin to listen for a button push, and for some ...
0
votes
0answers
18 views
GPIO change state record
I'm looking for a way to record Datetime and state of GPIO, but just want a record when the state change.
I have this in my code:
temp_def = 30.0
while True:
print(read_temp())
if(read_temp() &...
0
votes
2answers
37 views
MG 996R Servo only works in one direction with pi 4b
I have an MG 996R Servo from DM DIY More hooked up to physical pin 18 of my raspberry pi 4b running python 2.7.16 with GCC 8.3.0 on Linux2. I am powering the servo with an external 5V supply capable ...
-1
votes
2answers
73 views
Checking which GPIO pin is high
In my program, I have 10 push buttons
In a certain function of my program, I need to check if a particular push button is pressed. If it is pressed, function A should be called, while if any other ...
0
votes
1answer
44 views
RPi.GPIO library limitation - add_event_detect cache
How many callback events is cached in add_event_detect function? In my example below start_thread is executed just twice, but it is fired up five times (by the loop). To me it looks, that GPIO library ...
-1
votes
2answers
194 views
Raspberry pi 4 gpio pins not working
My Raspberry pi 4 gpio pins are not working for some reason I tried uninstalling and reinstalling rpi.gpio and gpio and it did not work here is the code
import RPI.GPIO as GPIO
import time
led = 26
...
1
vote
1answer
21 views
PWM transducer won't update frequency
I'm creating a simple script that outputs a text input to morse with an LED and a transducer via the GPIO pins on a Raspberry Pi 4 Model B. I tried to add input functionality with buttons that can ...
0
votes
0answers
64 views
Using same GPIO pins simultaneously from two Python scripts using RPi.GPIO
I have two different scripts. One is a Kivy app and another is a MQTT client script that subscribes to topics received from a web server. The same hardware connected to the GPIO pins can be used from ...
-1
votes
1answer
74 views
dtoverlay=gpio-shutdown,gpio_pull=off
I was wondering if utilizing the code below would be sufficient in shutting down and restarting a Raspberry Pi 3 A+ with the use of a TTP223 capacitive touch sensor. By default, the touch sensor is ...
1
vote
2answers
61 views
Relay no longer works on GPIO ports
I'm french excuse me for my english language, i works on a industrial vision processing device. I use the following components :
Picaméra
Raspberry Pi 3B +
Relay : SRD-05VDC-SL-C
I work on a python ...
0
votes
1answer
48 views
Receiving noise signal on input pin after connecting jumper wire to GPIO pin Raspberry pi 4
I am trying to use GPIO pin to get input from the sensonr, after connecting the sensor I noticed I have a lot of noise ( fluctuating signals between 0 and one). After further troubleshooting I noticed ...
0
votes
1answer
139 views
How fast are C & Python libraries
I ran some code to monitor Pi hysteresis which involved mirroring a GPIO input to output. I was surprised as how slow the code was, so wrote a C version. Although this was slightly better it was still ...
0
votes
1answer
86 views
Hardcode RF Codes - RPi-RF
I would like to use the rpi-rf module https://pypi.org/project/rpi-rf/ for a remote control alert system, using a PIR motion sensor as the input.
I have so far set up the PIR input and send and ...
1
vote
2answers
156 views
Controlling WS2812b LED strip produces inconsistent and uncontrollable output
Background
I'm trying to control a single WS2812b LED strip from a Raspberry Pi. I've followed this tutorial from raspberrypi.com (with the exception of Prep & Installation step 4, because I ...
1
vote
0answers
34 views
Raspberry Pi Python 3 Script - RuntimeError: Failed to add edge detection
I have looked at all the posts about this error, but none have cured it for me.
I am using a ChronoDot RTC on an old Pi B+ with the SQW Wave Output going to Pin 8 which I use to update an LCD display ...
0
votes
1answer
79 views
Using Pymodbus, I want to tie coil states to GPIO pins within my server not from a client
I am writing a PyModbus asynchronous updating server based on the example on the Pymodbus Asynchronous Server Example and I want to link the states of the coils to GPIO pin states, such as when coil 1 ...
1
vote
0answers
40 views
How to set PWM frequency below 1Hz on RPi?
does anybody know how to generate a PWM with less than 1Hz of frequency on Raspberry Pi?
I'd like to generate a PWM with 0.1Hz if possible.
Thanks in advance!
1
vote
1answer
33 views
Bluetooth Ignition need help smoothing out functionality
Hello I have been working on a Bluetooth authorized push to start ignition in my truck. Right now its installed and working but I would like to change the function of the button and shorten the time ...
0
votes
2answers
185 views
GPIO Pin 18 PCM clk
I'm new to the world of GPIO pins and I have 2 HATs that both want access to GPIO 18.
As this is an output pin can you share it between 2 HATS without side effects?
0
votes
0answers
32 views
Hardware Timed Servo PWM
I am working on a some time-critical system that will run image processing and controlling 4 SG90 servo motors. In short, I will do visual-servoing.
In this topic, joan pointed out some library, ...
0
votes
1answer
63 views
Controlling 4 servo motors through hardware PWM
I am working on a some time-critical system that will run image processing and controlling 4 SG90 servo motors. In short, I will do visual-servoing.
Since I will do visual servoing, I don't want to ...
0
votes
0answers
19 views
ltp305 Dot Matrix Python Library not allowing me to use display.set_character()
I am trying to display a number on a Dot Matrix ltp305 display that increases with each button press, enabled by the pressing of a normal button connected to the GPIO.
I am sure everything is ...
-1
votes
1answer
73 views
RPi.GPIO button interrupt/callback inconsistent behavior - callback functions do not return
I have this programm that has 4 buttons (5,6,13,19) linked to the handleBtnPress callback function. The handleBtnPress function sets a busy flag, prints which button is pressed and then calls the main ...
0
votes
2answers
714 views
Raspberry Pi DHT 11 sensor not working.I get None None
Have integrated Raspberry pi4 with a DHT sensor.
The data pin is connected to pin GPIO 26
Have tried connecting the VCC to both 3.3V and 5V
Have tried with both Adafruit_DHT.DHT11 and Adafruit_DHT....
-1
votes
2answers
234 views
RPi.GPIO: multiple buttons one callback function, ignore buttons while callback is executing
I have 4 buttons connected to my Raspberry Pi that call the same function when pressed. I'm using GPIO.add_event_detect to connect the buttons to the callback function. When one button press executes ...
-1
votes
1answer
178 views
gpiozero button to raise SystemExit / gpiozero clash with GPIO.cleanup()
TL;DR: Since this is a long question I have the following problems:
I'm looking for a good way to use gpiozero Button to raise SystemExit upon button press
I have an imported module to drive an E-Ink ...
0
votes
2answers
118 views
How can I query pull state of GPIO pin?
I am writing a script that should query if an input pin is configured as pull-up or pull-down using the RPi.GPIO package.
When configuring each output I can call
GPIO.setup(11, GPIO.IN, pull_up_down=...
0
votes
1answer
378 views
PIR motion sensor HW-416-B does not behave properly. No motion but input is triggered regardless
So, this motion sensor works when it is taped to my desktop computer...but when I move it to the wall, specifically a higher spot on the wall, it just keeps giving back an input signal. So here is a ...
1
vote
0answers
342 views
GPIO INPUT is always HIGH
I am working on a project with HC-SR04 Ultrasonic sensors. I am a beginner in raspberry-pi.
I have 3 sensors which are calculates the distance. But one of them has problem which is echo (input) pin ...
0
votes
0answers
20 views
How do I resolve import issues with multiple Python versions relative to PyCharm
I have searched everywhere for a beginner level understanding of how Raspbian/Ubuntu, etc. manages paths, which files I need to modify, how to use init.py, venv, etc. and it seems every time I install ...
0
votes
1answer
39 views
FruxePi Installation fails on RPI W
I've been trying to install FruxePi (https://github.com/fruxefarms/FruxePi), both 0.3 & 0.4 versions. But
To my understanding the setuptools / pi fails to install, but I can't imagine a way to ...
0
votes
2answers
637 views
RPi.GPIO: Check if a pin is being used
During development, I frequently encounter this warning, as expected. My threaded code frequently prematurely terminates during experimentation.
Steppers.py:26: RuntimeWarning: This channel is already ...
0
votes
1answer
158 views
RPi PWM issues - (re)start results in oscillating pin
I'm building a sauna controlling mechanism, controlled by the Pi, using PWM and solid-state relays.
Works fine, but after a while, the PWM breaks down.
At this moment, when I run the program and the ...
0
votes
2answers
170 views
How to create unfazed pwm signals?
I have two pins with the same frequency (10Hz) and same duty cycle (50%) assigned to two different leds. How can I make the two leds blink alternatively? How can I put a delay of 50% in one of the ...
0
votes
1answer
45 views
voltage issues with GPIO raspberry pi 2
Need some assistance here.
I am trying to setup some high voltage SSRs to my Raspi for an eventual lightshowpi project. Trying to start small first. I have a bunch of LEDs I have been playing around ...
0
votes
0answers
56 views
How to set event handler for a GPIO in Mathematica for Raspbian
I wish to program my Raspberry Pi using Mathematica (rather than Python). One basic functionality easily done with Python is to set event handlers which triggers a function when some event is ...
0
votes
1answer
75 views
Is it safe to use GPIO as GND for multiplexed 7-Segment display or should transistors be used?
I want to control a 4-digit multiplexed 7-Segment + Decimal Point Display (SH5461AS).
This diagram (which allegedly comes from the datasheet of this display) suggests to use 4 external transistors to ...
1
vote
2answers
894 views
Ubuntu 20.10 and GPIO
I have trouble installing RPi.GPIO library on Ubuntu 20.10. I run apt-get update and apt-get upgrade then apt-get install python python3 python3-pip python3-dev everything went ok. Then I run pip ...
0
votes
1answer
140 views
Raspberry Pi connected to Motor Controller- Getting error in code
*Hi, I am getting this code error:
*blink.py:25: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings.*
GPIO.setup(ENA1,GPIO.OUT)
...
-1
votes
1answer
33 views
input pin not working
I connected the 3v3 power pin to a switch and then to an IO pin set to input. when I turned on the switch, it works fine and I detect an input, but when I turned off the switch, it was going back and ...
0
votes
3answers
460 views
My GPIO.event_detected code is unreliable
I made this short program to understand GPIO.event_detected() better, and ended up more confused than I started. Please help me understand my mistakes. Here is the code, and some test output of me ...
0
votes
5answers
5k views
What is the proper way to debounce a GPIO input?
I have a project that involves using a Raspberry Pi to sense the state of a mechanical switch (actually, a relay, part of this light beam sensor). When the switch is closed, I want to sound a doorbell....
