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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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, ...
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1answer
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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
35 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.
...
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1answer
53 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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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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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 ...
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26 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. ...
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0answers
24 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
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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?
...
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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 ...
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2answers
269 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
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2answers
2k 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
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1answer
101 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?
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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
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1answer
57 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 ...
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1answer
45 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
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2answers
169 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
58 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 ...
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1answer
60 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) ...
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2answers
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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 ...
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1answer
118 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 ...
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1answer
136 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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26 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 ...
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1answer
28 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-...
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0answers
62 views
RPI GSM Add-on SIM800 AT commands are not working
I am trying to send sms using RPI Add on v22 module and Raspberry-pi 3+.
I have mounted this module on top of Raspberry-pi.
When I use minicome using
minicom -D /dev/ttyS0 -b 115200 -o
I get the ...
1
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1answer
67 views
GPIO PWM. ESCs still run different after calibration
I’m putting a quadcopter together. I’m using a python script to calibrate the ESCs... they beep like a blinking led when I give them power. Then I run the calibrate script and they give me the proper ...
0
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1answer
38 views
2 Motors functioning unevenly - right motor gets more power than the left
I'm trying to execute this piece of code to run 2 motors on my robot. The code is really simple it's just repetitive.
For some reason that I can't figure out, the motors run unevenly. Here is the ...
3
votes
1answer
149 views
pi4 no module named gpio
I am trying to import rpi.gpio in my geany on pi4,
but it comes with error no module named gpio.
The odd is that i updated pip and python and installed successfully with sudo apt-get install python3-...
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2answers
94 views
Runtime warning: This channel is already in use, continuing anyway [duplicate]
I'm trying to fix this code for a robot with multiple sensors. The values of TRIG and ECHO are input through another part of the code.
Set this at the beginning of the code
def init():
GPIO....
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1answer
46 views
Value of GPIO.input() automatically change
I have a simple code that read the input from pin 17 (BCM).
import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN)
try:
while True:
print(GPIO.input(17))...
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1answer
68 views
/etc/init.d/lirc doesn't exist
I am working on creating an IR remote for an older TV using my GPIO, primarily using this tutorial http://www.raspberry-pi-geek.com/Archive/2015/10/Raspberry-Pi-IR-remote#article_l1. However, when I ...
2
votes
1answer
78 views
I2C Communication between Arduino and RPi failing when Arduino is sending data
I'm trying to read some data from the Arduino slave and when I receive the data it shows some numbers but not the correct ones.
I'm using node and i2c-bus module, also tried with wiringPi but got the ...
0
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1answer
44 views
Water Sensor Pull_Down
I've got the classic Iduion Water Sensor (Link) and I want it to simply detect the presence of water but I get unreliable readings when using it like this:
import RPi.GPIO as GPIO
import time
GPIO....
4
votes
1answer
116 views
How to Monitor GPIO Input Indefinitely Without Recursion
I actually joined StackOverflow to ask this question because I wasn't sure it was RPi specific, but as I was thinking about how to form the question, I realized it might be GPIO specific (for some ...
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0answers
373 views
How fast can GPIO pins toggle on the Pi 4?
Benchmarking of the Pi 4 using the Python GPIO Zero library shows a significant increase in the frequency of toggling a GPIO pin on and off compared to previous models. This result is attributed to ...
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1answer
61 views
Pausing code execution till a button is pressed
I'm trying to pause code execution till a button is pressed and this is what I came up with. I have not tested this but can anyone tell me if this is the right way to go about it? Button 'pressed' is ...
0
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1answer
58 views
Is there a piece of hardware which enables hotplugging sensors to the breadboard?
The idea is the following: I have a Raspberry PI connected to a breadboard. To this breadboard, I would like to connect (digital and analog) sensors and actuators while the PI is running. Or remove ...
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1answer
33 views
RC522 modules stop working when more than 2 are connected
So, here's a synopsis of what I am trying to do. I want to put 3 RC522 readers side by side inside of a book, facing the cover, that will be constantly on, using a Rpi zero W. When an RFID chip gets ...
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0answers
124 views
raspberry pi3 + fingerprint
I'm looking for a way to connect fingerprint scanner with raspberry pi3 using python. I'd like to use only gpio or hat (not usb) interface. I'm searching for a while without figured out, so I've ...
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1answer
80 views
False Contact Closures - Do I Need Physical Pull Up Resistors to Resolve?
I'm running Raspbian Jessie 4.9.35-v7+ on a Pi 3 Model B. I cobbled together a basic python script to monitor a GPIO pin and send a network signal to a remote application, made two copies of the ...
1
vote
1answer
175 views
Raspberry Pi 3 B+ was connected to NRF24L01 in the following manner as in diagram but Raspberry pie not working after that why? [duplicate]
I connected VCC to 3.3V and GND to 5V of raspberry pie mistakenly. Now raspberry is only showing red light on and no green light blinking. What might be the probable reason. Is there any solution so ...
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1answer
106 views
Segmentation fault error. Trying to loop a python program [closed]
I'm using AT commands to send data over http, but the problem is that sometimes the program has an error and wont run again until I reboot and the GSM. Im using a crontab and also running the file as ...
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1answer
26 views
Corrupted image file when using win32 [closed]
What things make the file is corrupted and not readable as an image file?!
if the sd card is read-only, this prevent that I able to take a copy from it??!
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0answers
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How to run 3 Input scripts from 1 script
I've got an alarm system with 3 inputs and 3 outputs. But so far each input is controlling the outputs from it's own script. I did this because I wanted to get one thing at a time working on its own. ...
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1answer
37 views
How Can I Determine Why My Python Script Is Terminating?
I'm running Raspbian Jessie 4.9.35-v7+ on a Pi 3 Model B. I cobbled together a basic python script to monitor a GPIO pin and send a network signal to a remote application and made two copies of the ...
1
vote
1answer
891 views
Why is PIR motion Sensor always on?
I'm trying to make an alarm system but the motion sensor is always on as soon as the script is run. I've posted a question about a different problem i was having with this project so it'll confusing ...
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3answers
263 views
How to stop LEDs blinking when button is pressed
I've got 4 LEDs, a buzzer and a button. There's an add_event_detect to switch the LEDs and buzzer on and off. The callback methods works find when the outputs are just on continuously until another ...
0
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2answers
426 views
Reading only 0 from ADC using RPi SPI
Everytime I try to read analog channel 0 from ADC, it only prints 0. I am confused why. I shorted MISO and MOSI on my RPi to check SPI send/receive and it was working. But if I test it after properly ...
2
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1answer
86 views
While reading RC522 RFID reader keypad won't work
I am using pimylifeup library to read RFId card. But after id, text = reader.read(), I don't get reading from 4×4 keypad. I tried with both BOARD and BCM numbering to read keypad. I have to exit the ...
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2answers
73 views
Connecting RPi to a motion sensor
I'm new to working with RPi GPIOs, and I never studied electronics so bear with me on this newbie question.
I have an RPi 2 Model B, and I'm tasked with detecting a motion detector alarm going off.
...
