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.
598
questions
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Rpi 3/4 python 2/3 using mfrc522 RFID/NFC library to read/write Mifare blue tag problem
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://...
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1answer
30 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
...
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0answers
19 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-...
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1answer
37 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 ...
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0answers
27 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 ...
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0answers
11 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 ...
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0answers
20 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 ...
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1answer
103 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
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0answers
20 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
...
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1answer
60 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 ...
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1answer
128 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
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1answer
190 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 : ...
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21 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
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2answers
26 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
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4answers
78 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 ...
3
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2answers
53 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 ...
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0answers
22 views
Can we use pin 3 and 5 for rtc clock module and for detecting input from push button while both are connected?
I have my project where all the GPIO pins of raspberry pi have been utilized. Now I want to add an rtc clock module to the RaspberryPi. Pin 3 and 5 are already connected to the push button in input ...
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0answers
30 views
Can i transfer files between two rapberry pi's using Aux cable?
As a part of project, i have to transfer any file from one pi to another pi through Aux cable.
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0answers
179 views
raspberry pi GPIO input value changing randomly
We attached a wire to pin 40 and another one to 3V3 supply. Also attached an LED+resistor between 5 volt and pin number 38. When the wires do not touch each other, the LED constantly emits and all the ...
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0answers
33 views
Raspberry pi 0's GPIO not working (no output)
So I used to use a Raspberry Pi 3B to control my LED strip. It was, of course, an overkill but a fun project.
I now want to do the same but with a Raspberry Pi Zero w. I got one, soldered the GPIO ...
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1answer
65 views
Can Rpi receive serial/UART data through GPIO pin?
Can I receive data which is transmitted through UART port from a transmitter side raspberry pi on a receiver side Raspberry pi's GPIO pin??
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1answer
105 views
writing into fifo file and reading it
1.Transmitter side code:
A)Recording audio into fifo file(no need to create fifo file separately arecord command will create fifo file):
import os
os.system('arecord -D plughw:1,0 -d 0 --rate=19200 ...
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0answers
29 views
What happens if a GPIO “in” pin is accidentally configured as “out”?
I have a 433MHz receiver connected to a GIPO pin (which is configure as "IN"). I was wondering what happens if the GPIO is accidentally configured as "OUT" during reboot, shutdown, or when another ...
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1answer
26 views
I run thonny and have no module name RPI error
I run Thonny on a pi zero.(i am a beginner)
want to activate gpio
i get an error" import rpi.gpio as pigo, modulenotfounderror: no module name 'rpi'.
i have update library. still not working.
2
votes
1answer
106 views
Voice transmission through UART
I want to transmit real time voice signal recorded by usb MIC through uart using Raspberry pi 3b.
But by using USB MIC it is not possible for me to transmit voice to uart directly without storing it.
...
1
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2answers
84 views
Whenever I restart my Raspberry pi 4, GPIO pin number 3 goes high and low very fast (bug in pi?)
I just switched from Raspberry Pi 3 to 4, which I use to control some devices. I just discovered that whenever Raspberry pi 4 boots, it changes the pi state of GPIO pin number 3 very fast from low to ...
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0answers
20 views
Is it possible to consistently apply voltage to two or more devices?
I want to connect two or more of the following actuators to my raspberry pi:
https://www.ebay.com/itm/Nano-Magnetic-Actuator-diy-micro-plane-model-servo-micro-actuator-0-5g-/183745663278
However, ...
0
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1answer
29 views
Is it possible program GPIO PINs using Microsoft MakeCode?
It is possible to run Microsoft Make Code on a Raspberry Pi. But it looks like I can select a bunch of boards but not a Pi.
Is it possible to program the GPIO pins on the Pi by running Make Code on ...
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1answer
46 views
Turn On/Off 3D printer projector with Python/GPIO
There are similar questions but I don't want to turn on the LED but the 3D printer projector(NQM Plus Light engine) for the image projection.
The pins that I wanted to use are shown in the picture.
...
3
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1answer
148 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?
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1answer
1k views
How to connect ST7789 LCD to Raspberry Pi
I'm trying to connect to this LCD ( sry 4 japanese page:( use translate plz )
This monitor driver is ST7789, 7pins.[GND VCC SCL SDA RES DC BLK] And now I'm connecting to pi like this https://imgur....
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0answers
29 views
How to make more efficient reading of GPIO
My (python) program (on Raspberry Pi zero W) turns on/off a GPIO pin (connected to a relay module) depending on the RSSI signal of my phone (connected via bluetooth) and the status of one more GPIO ...
0
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0answers
30 views
Timed trigger for GPIO input
I'm running a raspberry pi system that records fish as they swim passed an IR break beam sensor at a fish ladder. So far the system works well but I'm trying to cut down some of the false triggers. ...
2
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0answers
30 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 ...
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3answers
313 views
How Can Rpi3B+ Detect MQ9 Gas Sensor's Carbon Monoxide Leakage, Without Using ADC?
I already have bmp180 sensor connected to raspberry pi 3b+, now I want to add MQ9 sensor like this https://e-radionica.com/en/mq9-gas-sensor.html
Is connection straight forward like the bmp180?
...
-1
votes
1answer
235 views
Module not found Error
I am working on rasberry3 pi b+ model for my project and I did installed NOOBS zip file and stored in Micro SD card and put in SD slot on Rasberry Pi b+.
When i'm compiling my python code for my ...
3
votes
2answers
987 views
How to connect ST7789 LCD to SPI Bus 1 as 2nd screen?
I've been trying to get this ST7789 library working with the 240x240 1.3" display on the rpi0w
Python lib
https://github.com/solinnovay/Python_ST7789
So far I've set all the screen pins to the bcm ...
3
votes
2answers
4k views
Where are the uarts on the raspberry pi 4?
The raspberry pi 4 has at least two uarts (as shown here), I know where I can connect to one of them. Pins 8, 10 and 12 have a uart as an option.
Source:
This site describes accessing uart1, where ...
2
votes
1answer
232 views
How to connect EEPROM to Raspberry Pi 3?
I was wondering on how to connect an EEPROM chip to the Raspberry Pi 3? And any suggestions on which EEPROM chip model is best to use with RPi3?
0
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0answers
113 views
pad4pi (rpi_gpio) Library “registerKeyPressHandler” not working as expected
I'm currently writing a python program, that initializes the fingerprint sensor at first then showing the number of used templates on the fingerprint sensor after pressing "1" on the matrix membrane ...
2
votes
1answer
132 views
How to install a library on the Raspberry pi 3 without internet?
I've to install the RPI.GPIO library on my raspberry pi 3, on the other hand, I don´t have acess to the internet in this. I'd already download the library in another computer and put this in my USB ...
0
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1answer
63 views
Why the same GPIO pin is not working anymore?
I was working with a very simple code:
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(24,GPIO.OUT)
GPIO.output(24,GPIO.HIGH)
But after running one time when I am running the code nect time ...
2
votes
3answers
342 views
Is there any built in LED connected with GPIO pin?
In Arduino a built in LED is attached with number 13 Digital pin.
Is there any LED like Arduino in Raspberry Pi,which I can use to test my code?
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2answers
132 views
Communicate with GPIO HIGH/LOW between 2 PIs
I have 2 raspberry PIs 1x PI3 and 1x PIZero with camera attached. I want to set up a system to have a output GPIO pin on the PI3 and a input pin on the pizero connect so that when I set the PI3 pin ...
0
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1answer
109 views
RPi.GPIO “flush” interrupts
Intro
It seems to me that when one adds and event detection, then removes it and the adds it again, something strange happen: 1) an event is removed to the "detection list"; 2) the event happens; 3) ...
1
vote
2answers
3k views
Is the gpio readall command compatible with RPi 4?
It's already a while since I got my Pi 4, but never used the gpio readall command until yesterday. I have run into an interesting error.
pi@raspberrypi:~ $ gpio readall
Oops - unable to determine ...
1
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1answer
178 views
GPIO pin (BCM 12) acts differently on PI3 and PI4
The following code is running on PI3 and is working perfectly fine. I try to provide a short description of what the code does. In this code I first set the BCM 12 as the pin of interest for my sensor ...
0
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1answer
242 views
Barcode Scanner using RX & TX (GPIO) PIN
Im having some issues reading from a barcode scanner module.. The scanner works just fine if it is used with a USB adapter, my goal is to use the RX & TX GPIO of my RPi to control it.
What I am ...
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0answers
27 views
RPi 3B power supply and external USB Hub issue
I am building a project with a custom USB hub attached to one of the RPi USB ports. On the custom hub I attach 7 USB devices powered by their own batteries.
The custom USB Hub is equipped with an ...
0
votes
1answer
47 views
Commercial PIR intergration with Raspberry pi zero
Here is the problem I face. I have a commercial PIR and wondering if it can be seamlessly connected with my pi zero w and how.
PIR specs:
https://www.thecrowgroup.com/cr/uploads/2019/03/Datasheet-...
