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.
630
questions
-2
votes
0answers
29 views
Cannot get Pi to detect button release?
I can detect the button press no problem but I also need the release. I am using this button. I have connected it using these. It is connected to GPIO19 (the third-from-last pair of pins (lengthwise ...
-1
votes
1answer
35 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, ...
0
votes
0answers
12 views
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 ...
0
votes
1answer
36 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 ...
1
vote
0answers
132 views
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 ...
2
votes
1answer
78 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 ...
0
votes
0answers
31 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 ...
0
votes
1answer
59 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 ...
-2
votes
1answer
31 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 ...
0
votes
0answers
86 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-...
0
votes
0answers
49 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 ...
0
votes
2answers
118 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 ...
1
vote
0answers
36 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, ...
0
votes
0answers
36 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 ...
0
votes
1answer
28 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)
...
0
votes
2answers
87 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 ...
0
votes
2answers
50 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....
1
vote
1answer
35 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 ...
0
votes
2answers
29 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?
0
votes
0answers
29 views
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 ...
0
votes
1answer
38 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
...
0
votes
1answer
88 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 ...
0
votes
0answers
45 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 ...
0
votes
0answers
24 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....
1
vote
1answer
77 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 ...
2
votes
1answer
28 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 ...
0
votes
0answers
20 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, ...
2
votes
1answer
30 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.
...
1
vote
2answers
95 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 ...
0
votes
0answers
330 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 '...
1
vote
1answer
27 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.
...
1
vote
1answer
36 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 ...
1
vote
1answer
43 views
PWM not reaching desired frequency after checking on oscilloscope
I am attempting to setup a PWM signal on Pin 12 (GPIO #18) using a Raspberry Pi 3. I am capable of sending a PWM signal, however it is quite off from the target frequency. I have an o-scope that I ...
0
votes
0answers
26 views
Flashing of LED
This is my first post here so HELLO and sorry if I'm posting in the wrong place.
I had assigned a time limit of 40s for led blinking. Can I pause the blinking of this led and make another led to blink ...
2
votes
1answer
870 views
How can Rpi SPI python read the MFRC522 NFC module?
Trying to read my RFID MFRC522 using a Mifare blue tag and it is not working. Wondering if i could get any help on this as when i put the tag to read it doesn't show up as quick?
using:
https://...
0
votes
1answer
35 views
no output from 8 channel relay when i run the python script below
# import GPIO and datetime
import RPi.GPIO as GPIO
import datetime
# set GPIO numbering mode and define output pins
GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)
GPIO.setup(37,GPIO.OUT) #Relay 1
...
0
votes
0answers
94 views
Raspberry Pi connect to external RFID Module FDX-B/Animals
I have purchased an RFID reader which is supposed to be able to read implants that are in animals
RFID https://www.ebay.com/itm/134-2K-AGV-RFID-Animal-Tag-Card-Reader-Module-TTL-FDX-B-ISO11784-85-...
1
vote
1answer
119 views
Pi Zero W and Light Sensor with LDR
I have a Raspberry PI Zero W and Light Sensor like on the photo:
I connected it to Raspberry Pi as follow:
GND to GND
VCC to 5V
SIG to GPIO-3
Using the following code below I am able to detect if ...
1
vote
0answers
50 views
Multiplexer and Python problem on Pi
So I've got a 16-to-1 multiplexer I'm using on the raspberry pi. Right now I've only got one motion sensor attached to it (on channel 15) to test it before i attach and fill up all 16 channels on it ...
0
votes
0answers
27 views
Ifconfig, interrupt device and enc28J60 spi1
Good morning
I have configured and connected an enc28j60 card to the spi1 port of my raspberry pi3 and I have found the error in the photo that does not make the ethernet port work. I ask you for help ...
0
votes
0answers
29 views
Interrupt Servo once movement has initiated
I'm new to python and RPis. I'm building my own robot to learn.
I manage to control my little robot and move it around, as well as moving the pan camera with my keyboard.
While I was searching for a ...
1
vote
1answer
585 views
Please set pin numbering mode using GPIO.setmode(GPIO.BOARD) or GPIO.setmode(GPIO.BCM)
I've got an LED on bcm 18 and a servo motor on bcm 8. My code appears here.
from gpiozero import LED
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(8,GPIO.OUT)
servo = GPIO....
0
votes
0answers
27 views
Why does EmulationStation block GPIO event loop?
I am working on a custom startup script for the Kintaro super kuma 9000 (link is down ATM) case for my raspberry pi 3B+
Here is the minimal example:
import RPi.GPIO as GPIO
import os
import time
...
2
votes
1answer
132 views
Rpi python GPIO PWM control L298 and PCA9685 motor HAT
I need to find out which GPIO pin on the raspberry pi will be connected to which module when I fit the Adeept Motor Hat v2.0 on the 40 GPIO pins. I am attaching the image and the schematic of the ...
0
votes
1answer
442 views
Rpi python GPIO PWM control L298N motor direction and speed problem
I am unable to understand parts of the code
#!/usr/bin/python3
# File name : motor.py
# Description : Control Motors
# Website : www.adeept.com
# E-mail : support@adeept.com
# Author ...
0
votes
1answer
437 views
Rpi python using L298 motor driver and PCA9685 servo controller to change speed and diretion of robot car
I am unable to understand the code provided with the raspberry pi robo kit I got.
I need help in understanding the code as I am new to raspberry.
Thanks!
#!/usr/bin/python3
# File name : ...
0
votes
0answers
28 views
Rpi 3b Simon Says Button Help
I'm just starting out with my pi and wanted a little project so I decided I'd try and create the game "Simon Says". I rigged up 4 buttons and 4 LEDs on a breadboard, etc. The aim of the game (for ...
2
votes
2answers
55 views
SPI Not working when chip select is connected to ground, works fine when connected to CE 0,1 or 2
I am working on MFRC522 sensors. However I need more than 3 SPI Devices. The 3 works fine except when I want to connect chip select to GPIO, It does not work. I tried a single spi device by connecting ...
2
votes
4answers
83 views
Why is my relay switching on automatically when I start my program?
I'm building a little automated hydroponics system using a raspberry pi zero, a 5 volt relay, a pump and a soil moisture sensor from adafruit. So far everything is working, I can pull the pin to high ...
4
votes
2answers
162 views
Python file called by PHP script in apache server unable to get RPi.GPIO
I've been trying to use a site on my local network to activate the GPIO pins on my Raspberry Pi 4. I installed apache and wrote a quick PHP script which executes a python file in /var/www/html.I have ...
