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: 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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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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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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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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RaspberryPi 4 Python RPI.GPIO Output always high

Running Raspberry OS in a RaspberryPi 4 and I have a rc522 RFID connected and working, but for some reason I can't control any of the GPIO ports. The point of this project is to wake an ESP32 from ...
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1answer
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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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1answer
138 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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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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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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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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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
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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
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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
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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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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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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
484 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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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
90 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
87 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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468 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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62 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
415 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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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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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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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
396 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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240 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
50 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
60 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
60 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
242 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
54 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
26 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
186 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
30 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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35 views

Threading with GPIO and Push Buttons

I'm trying to loop some code in the main function of the program, while running a thread in the background that's listening for a button press through GPIO. I can see that the thread is running, ...
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1answer
39 views

Using event detection to immediately interrupt a function and callback to

I have made a script (below) which which controls a LED through two functions, blink_fast() and blink_slow(). My goal is to control the "mode" of the LED by using a physical push-button wired to GPIO. ...
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2answers
286 views

Communication between 2 raspberry pi's

I am trying to communicate between 2 raspberry pi's (3B and 3B+), through Gpio's (not uart, just as input output). So I am making a gpio on one Pi as Input and on the other Pi as output. So can I ...
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0answers
867 views

pyaudio - Alsa warnings on Raspberry pi

I am trying to send data through 3.5mm jack. In that process, Everytime i'm getting these warnings import pyaudio p = pyaudio.PyAudio() The following warnings are: Expression '...
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1answer
51 views

Setting a GPIO port for an accurate time duration with Python

I am trying to set a GPIO port to LOW for n seconds and set it to HIGH afterwards. The problem is that it's not at all accurate. It varies between a small number of seconds to 2*n or even more. ...
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1answer
38 views

Is there a limit to reading from sensors using Raspberry PI and Python?

According to this datasheet this sensor puts out signals < 10ms. When using RPi.GPIO and the add_event_detect callbacks, is there a chance that I will miss information because of the processing ...

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