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.

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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 ...
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1answer
25 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 ...
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2answers
49 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=...
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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 ...
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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 ...
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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 ...
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1answer
18 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 ...
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2answers
47 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 ...
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38 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 ...
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2answers
46 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 ...
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1answer
35 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 ...
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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 ...
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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 ...
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269 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 ...
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1answer
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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) ...
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1answer
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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 ...
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3answers
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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 ...
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MAX98357A Adafruit amplifier no output

I'm trying to connect the MAX98357A Adafruit board to a rpi Zero W. I've followed their documentation for installing and testing it. The installation went ok with no errors but at the test i got no ...
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4answers
736 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....
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2answers
56 views

No RPi. module found [duplicate]

Is it only possible to find the RPi. module when I'm connected with my Raspberry. I wanted to write the program first and then load it on to my Raspberry. But I get the Error that there is no RPi. ...
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35 views

regulating the speed of a motor connected to a TB-6612 FNG motor driver using the pwm output generated by the pca9685 multichannel servodriver

I understand that this type of usage is not typical for the pca9685. I am trying to use one of the pwm pins of the pca9685 to regulate the speed of a motor. As for now the motor works regularly if ...
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0answers
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Wiring 12V 5 pin relay (without a module/board) for usage with Raspberry Pi

I'm trying to setup an automated garden as a quarantine project for my mother and I can't really figure out how to properly wire a 12V 5-pin relay module as every tutorial online only shows the ones ...
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3answers
101 views

How exactly do i make a LED Blink? I tried every possible result

I am trying to make a LED blink on a Raspberry Pi Breadboard, but after everything I've tried, it doesn't work. I have tried: Changing wires and moving them around Switching LED's to check if the ...
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1answer
100 views

Power multiple add-ons on one 5v pin

I have multiple add-ons connected to my Pi that currently use all of the 5v pins. I want to run more add-ons to the Pi that need 5v power. The 5v pins are connected using male to female GPIO jumper ...
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1answer
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Odd results when using RPi.GPIO's event_detected() function

I've recently been experimenting with RPi.GPIO's event_detected() function, to check if a button (connected to the gpio) has been presssed. However, for some reason events would randomly be detected. ...
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1answer
36 views

Arduino to Pi reads high all the time [closed]

I'm trying to read a signal coming from an Arduino through a wire attached to pin 24 of the Pi. The problem is the Pi reads high all the time. I tried to do a pull up using GPIO.setup(24,GPIO.IN, ...
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RPI Stops Reading Micro SD Card If I Plugin PI Fans before it and Vice-versa

facing issues with the heat sink casing that I bought it got 2 fans. So, if I connect the fans before the boot RPI doesn't read the micro SD card and no green light. But, if I remove the fans ...
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1answer
43 views

Two unrelated GPIO scripts interfere with each other

I have two completely seperate python scripts involving the GPIO that runs on startup. The issue i'm having is that when I call the turn fan on or off it sometimes triggers the halt script I have and ...
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0answers
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speaker and mic with Raspberry pi 4

I'm making a project, a surveillance camera with audio. Live feed from my localhost webpage. the live camera part is now okay and working, my problem is the "intercom" part. I don't really ...
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1answer
695 views

GPIO inputs don't work on Raspberry 4 running Ubuntu

I have several RasPIs set up with Ubuntu Server 18.04 64Bit. One freshly setup up RasPIs 3B+ and two 4Bs. On all I can run the following minimum script without any error messages: #!/usr/bin/env ...
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0answers
33 views

Can a threaded callback function modifying pins with interrupt detection in the main thread lead to an infinite loop?

I'm using RPi.GPIO and making a switch matrix which waits for rising or falling edges caused by switch toggles in the rows, triggering a scan of all the switches. I have one interrupt for each row, so ...
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1answer
102 views

How to clean up gpio pins properly?

I'm a newbie with Raspberry Pi as well in python and node red. So my goal with my project is to make a DIY irrigation systemm. I have an RPi, which reads value from the soil moisture sensor and ...
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1answer
109 views

How do I connect my 24 pin fpc to dip breakout board to my rpi zero w?

So I am working on a type of headset and I bought the adafruit 1.3 ips with 24 pin fpc connector and st7789 driver and I'm thinking of using a breakout board to do it. What I don't know is the pin out ...
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605 views

Powering capacitive soil moisture sensor from 5V Pin

I'm completely new to RPi, and I'd like to make a garden project, at first I would like to measure the soil moisture. I purchased one of these sensors https://www.amazon.com/Analog-Capacitive-Moisture-...
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0answers
70 views

I2C, SPI and Python Libraries with Raspberry Pi 4b

I've been working with RPi.GPIO so far but I have had issues with PWM and edge detection, which are well known issues with RPi.GPIO, anyway, after some research I'm considering using a different ...
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2answers
513 views

PWM issues with pigpio and RPi.GPIO

I am using Pi Zero W with latest Raspberry Pi OS. I have a backlight of an LCD that I am trying to control via PWM. If I use RPi.GPIO I get flicker at anything other that 100% (or 0%) duty cycle. As ...
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0answers
77 views

PIR sensor always high with Raspberry Pi3 without breadboard

I have a HCSR501 PIR motion sensor, which has 3 pins (Vcc, Out, Gnd) that I've connected to 5V, GPIO 26, and Gnd respectively. Despite following all the steps in tutorials for interfacing the sensor, ...
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0answers
43 views

Using a port expander AND other GPIO pins

I'm working with a port expander for the pi to run four stepper motors from python. It was working great until I tried to also use a GPIO pin on the pi (not on the port expander) as an output. I was ...
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1answer
37 views

Not getting a full 3.3V instead getting like 0.7V on a GPIO pin

Okay so I ran the following code and I am seeing ~0.70V on the GPIO pin and not 3.3V. Why could that be? #import the GPIO and time package import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) ...
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2answers
555 views

Using PWM with RPi.GPIO in Python

Scenario: I want to control a PC fan using the Raspberry Pi. The 4-wire-fan (MGT9212UR-W25) has its own power supply (12V) and can be controled via PWM. I would like to control it with a Python script ...
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2answers
319 views

RPi.GPIO Cleanup() only specific pins?

Im using the Pi to control some relays, that in turn switch some light bulbs. some code for clarification: def do_work(job): try: duration = int(job.Duration) gpioPort = int(job....
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1answer
56 views

Can Rpi GPIO pins be used to drive a DC motor? [closed]

I tried to GPIO pin to high and I cannot see output voltage. I try every solution but no one works for me. import RPi.GPIO as g g.setmode(g.BOARD) g.setup(16, g.OUT) g.output(16, g.HIGH) I look GPIO ...
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2answers
74 views

using RPI 3.3v and 5v pins as reference for level shifter [closed]

As the title says, simply, can I use the 3.3v and 5v power pins on the GPIO connector as the reference voltages for a level shifter, or do I need some other reference?
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Raspberry Pi3 - Controlling 4 DC motors

I need to feed 4 DC motors of 5V on my Raspberry Pi 3 Model B using PWM (Pulse Width Modulation). Currently, I have the next components: 2 NPM transistors, 1 L293D integrated circuit, resistors (220 ...
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1answer
74 views

PWM problem in a frequency less than 100Hz

I have attached a fan to pin #17 (through a transistor of course) and am writing a script to turn the fan on for a specified duration with a specified PWM duty. #!/usr/bin/env python import os ...
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1answer
363 views

function to wait for any of the buttons press

I'm working on a project that use four buttons to navigate in a menu. The root options of the menu have nested options etc. The buttons don't have hardware de-bouncing. My ultimate objective is to ...
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0answers
59 views

Using a GPIO pin as output and input

Good morning everyone, i'm working in a project that involves having an state pin and button detection. The escenario is the following: when raspberry pi finish booting, a pin is pulled HIGH (this ...
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0answers
28 views

Remote GPIO on rpizero with Buster

I want to turn on a gpio output and receive input from a gpio input. This is all initiated from a webpage. I am making an ajax call to a php file which itself runs the python script. It does not work....
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1answer
220 views

Run Python RPi.GPIO as sudo

I'm trying to use the RPi.GPIO Library in a python-script with root-privileges. I essentially need to run it with sudo because other stuff in my script require root-privileges. When i try the ...
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1answer
31 views

How do I diagnose suspected power issues?

I have a Pi 3 project that has quite a few things attached. 4 DHT-22s powered from the 5v rail (5m cable length, so I needed the 5v for the voltage loss). Wired in like this 2 Magnetic door reed ...

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