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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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.
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152 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. ...
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184 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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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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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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63 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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685 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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7k 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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71 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 ...
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1answer
162 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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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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How Can Rpi3B+ read MQ9 Gas Sensor?

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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3answers
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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 ...
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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 ...
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1answer
935 views

How to connect EEPROM to Raspberry Pi 3? [closed]

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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1answer
633 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
146 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 next time ...
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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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580 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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342 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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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
253 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
675 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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346 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 ...
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1answer
144 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 ...
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1answer
77 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 ...
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1answer
342 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
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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
286 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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443 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 ...
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1answer
146 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 ...
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1answer
92 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....
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1answer
1k 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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2answers
2k 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
801 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 ...
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1answer
73 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
45 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
254 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
324 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 ...
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1answer
585 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
463 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
63 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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51 views

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
87 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 ...
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2answers
4k views

Why is HC-SR501 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
799 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 ...
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2answers
1k 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 ...
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1answer
200 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
217 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. ...

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