Questions tagged [gpio]
GPIO stands for General Purpose Input Output and can be used to receive and send digital signals to and from simple electronics from the Raspberry Pi.
2,609
questions
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How to operate 4 wire stepper motor and operate
I have a stepper that has 4 wires:
PIN 1 --- A --- BLK --- CONNECTED TO GPIO 4
PIN 2 --- A\ --- GRN --- CONNECTED TO GPIO 23
PIN 3 --- B --- RED --- CONNECTED TO GPIO 17
PIN 4 --- B\ --- BLU --- ...
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0answers
14 views
Voice-enabled QnA bot [closed]
I want to develop a custom voice-enabled QnA bot. I am relatively new to the raspberry pi. I want to know if such a project is possible with this kind of hardware that raspberry pi offers. Please ...
2
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1answer
42 views
Relay does not turn off
I am trying to control a 4-Relay module with my Raspberry Pi 4.
I tried to do that by writing this script:
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
relais_1 = 8
relais_2 = 10
...
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1answer
23 views
Rpi 4 Pin 29 default to High pull?
I am fairly new to Raspberry PI GPIO pins. I have some simple code which sets Pin 29 (BCM 5 in this picture) as an IN (READ) Pin and then reads from it after boot and on raspberry pi 3 it has always ...
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2answers
34 views
Am I missing GPIOs?
I'm currently trying to resolve an issue, where my OnOffShim doesn't shut down the Pi 3B anymore.
So I checked /sys/class/gpio and was a little surprised that I don't find all GPIOs there:
user@rpi:~...
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1answer
52 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 ...
0
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1answer
29 views
Safe way to limit GPIO output time
I'm trying to figure out a fail-safe way to provide an output on GPIO pin of the Pi that would not be vulnerable to my (possibly) buggy code crashes. Is there a surefire way to do so?
Scenario: I ...
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34 views
SDA/SCL values of accelerator VALUES get affected when I use other pins
Essentially the SDA/SCL reads the I2C values of the accelerometer perfectly fine when no other pin on the pi is active.
I have connected 4 drone propellers and whenever I give thrust to them by ...
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0answers
19 views
Raspberry Pi controlled RGB LED strip very dim
I have followed this tutorial https://dordnung.de/raspberrypi-ledstrip/ to hook up my raspberry pi zero w to a 12V rgb led strip. The lights come on and are able to be controlled using pigpiod, ...
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26 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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2answers
66 views
Multi-threaded python function using list and dictionary of GPIO pins cannot activate a relay problem
At the first part of the code(Initializing relays) the GPIO output works as expected, but at the second part it doesn't works, I have break my head for the last four hours trying to find out what is ...
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0answers
42 views
Serial reception through uart [duplicate]
I want to do real time voice communication through uart of raspberry pi 3b.Currently I am able to transmit data while recording it.But at receiver side I am not able to receive it properly.The code I ...
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3answers
38 views
Can I send 12 volt output signal from a Guardline Security Alarm to a Raspberry pi GPIO input of 3.3 volts
My new Guardline Security Alarm can send a 12-volt output signal to an accessory device.
I would like to send that signal to my Raspberry pi and have it send an email to my iPhone.
I bought a SMAKN Dc/...
1
vote
1answer
59 views
lighting up LEDs from suricata security alerts
so I am a Python newbie attempting to write a script that will light up a different LED based on the priority level of the latest security alert added to a log file generated by the Suricata Intrusion ...
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1answer
35 views
Can a voltage at a GPIO pin with no mode set harm the pi
I have a Raspberry Pi 2 Model B, and I plan on using the GPIO pins to detect whether a voltage is present or not. However, the circuit that controls the voltage levels runs independently from the pi, ...
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1answer
48 views
Turn GPIO pin to 5v pin
Is there a way to change GPIO function to use it as 5v power pin. Because all of the power pin used for the Touch Screen.
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1answer
46 views
5v/12v power source/submersible water pump/RPI/relay. What kind of combination is suitable?
I am using a 12v DC water pump with a 20 l/min flow rate, a raspberry pi 3B and a distance sensor.
I would like to use a relay and an external power supply to control turning on/off the water pump. so ...
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2answers
47 views
Is RPi 4B protected against GPIO shorting?
I read that a Pi 3's +5/3V GPIO pins when they contact, potentially frying the whole computer. Does this still happen/what's the risk of this happening on a 4B? Is it "protected" in any way?
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0answers
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Generating arbitrary bandlimited waveform on GPIO 4 (GPCLK0) on Pi Zero W
I am trying to use the Pi Zero W to generate multiple FM signals concurrently, and I think that it is possible, but I would like for anyone to point out any problems in my method:
The famous FM ...
2
votes
0answers
32 views
LIRC mode2 shows no output
I am trying to receive configure an IR remote control for my raspberry and I configured LIRC on the Pi and it works all fine but I won't be able to capture some output with
mode2 -d /dev/lirc0
I ...
0
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1answer
31 views
Is it safe to put capacitor on 3v3 pin of raspberry
I am going to use INA220 ic for current monitoring, and the datasheet says:
Use a 0.1-μF ceramic capacitor for power-supply bypassing, placed as closely as possible to the supply and ground pins.
...
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0answers
37 views
Sine Triangular PWM using Raspberry Pi 4
I am new to Raspberry pi. I want to make sine triangular PWM which will control the H-bridge of the inverter. I generate sine wave (50 Hz)and triangular wave (1500 Hz) using python language and ...
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1answer
20 views
polling gpio raspberry 2 doesn't work
i'm writing a library for my raspberry pi 2 for gpio control.
I'm trying to test a function for read a gpio driven by interrupts with sysfs but i can't do that my function stops in poll() function.
...
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21 views
Bridge between Twilio API/phone line and closed circuit 20v intercom
Question about how to achieve the below using a Raspberry PI. What hardware would i need to buy and is the below possible?
I have a closed circuit intercom system in my house. This is a video ...
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2answers
53 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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26 views
Pull up resistor is broken?
As far as I understand, after activating internal pull up resistor like this:
GPIO.setup(pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.input(pin) should give me 1. However, I get 0 for pins 38 and 40 ...
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0answers
29 views
EasyDriver stepper motor through sysfs not moving
I'm trying to activate a stepper motor using easydriver from here https://www.schmalzhaus.com/EasyDriver/Examples/EasyDriverExamples.html using sysfs and C, but it doesn't move.
I connected my ...
3
votes
2answers
134 views
SSD1306 OLED I2C Detection Problem
I know there are similar questions, but none of them helped me out.
I have a Raspberry Pi 3 Model B Rev 1.2 and Raspbian 10 installed. I try to connect an 0.91" Oled display (Hardware Details) which ...
2
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0answers
36 views
Unable to intercept the code of my remote control at 433 MHz with RaspberryPi
I'm trying to reproduce the code generated by my universal 4-channel radio control with RaspberryPI.
I cloned my remote with a universal remote like this:
I used the libraries included in 433Utils ...
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0answers
24 views
i2cdetect show bus is different every time
I am use ToF sensor(VL53L0X) on my Raspberry Pi's GPIO,I discover one problem about VL53L0X.
I am input command
i2cdetect -l
It's show
i2c-1 i2c bcm2835 I2C adapter I2C ...
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1answer
35 views
GPIO ports going high on setup not output line
I hope someone can help with this, i've looked at similar Q&A's but haven't found an answer that solves the basic question.
Right, trying to give all the info...
I'm using a first generation B+ ...
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0answers
21 views
GPIO push button popout webpage
I have a project that I connected a push button to RPi 4's GPIO, and if I push the button it writes out "Button pushed". I wrote this code in python. Now I want this code to run in a webpage. So I ...
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0answers
33 views
How do I use extended pins with the Raspberry Pi?
Might be biting off more than I can chew with this project but I received a raspberry pi + touch screen kit and wanted to add 2 max31865 chips. Screen takes up most pins but luckily has ' extended the ...
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23 views
Looking for information on connect raspberry pi to ps2 console
I am wondering if anyone can tell me if it is possible or help point me ilin the right direction to information about connect a raspberry pi to a ps3 console and have it act like a controller. I have ...
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0answers
39 views
Crontab with WiringPi
I want to change pin state at certain time with Crontab.
I tried to use this command: 7 0 * * * /usr/bin/gpio -g write 0 0
but it returns me this error: bash: 7: command not found
I also tried: 7 0 * ...
6
votes
1answer
45 views
Debounce code for reed switch rotation counter
I have just finished my first ever Raspberry Pi project (a hamster wheel counter that uploads to Thingspeak) following an online project I found that included the code.
(https://www.hackster.io/...
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2answers
109 views
How to decode a 433MHZ signal
I've made the classic 433mhz send/receive experiment, using cheap hardware on the same breadboard and same raspberry, I've wired both sender and receiver to VCC 5V, GND to GND and data to GPIO 27 (...
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GPCLK: my CLK_CTRL register has the right bit assignments, but my CLK_DIV register is wrong and my program keeps crashing
I can't figure out what about my code is wrong. I've been using the BCM2385 Manual (particularly pages 107 and 108) and this GPCLK guide. I'm using a Pi 3 Model B right now, so based on this it sounds ...
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1answer
64 views
Controlling LEDStrip using Pi (3B+)
Yo, My name is Fabi,
Like 2 Months ago i started this "Project". I wanted to controll my LED Strip using my Pi. And this pi should host a Local webpage so i could control my led strip using any ...
1
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1answer
23 views
How to send keyboard strokes from a rpi trough rx/tx to a windows pc (preferably with python)
I want to play around with an rpi to send keystrokes or keycombinations from my rpi to a windows pc.
I dont want to configure anything on the windows pc in order to achieve it. So far all the ...
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0answers
47 views
My Pi is annoying my security alarm system
I'm a bit of a Pi addict - we've got six Pis around our house doing various things.
My latest project was to add a little bit of smart control to our dumb MHRV (Heat Recovery) system.
I've got a Pi ...
1
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0answers
21 views
Arducam blocking i2c
Ive been trying the get the Arducam 16MP IMX298 Color MIPI Camera Module to work with some I2C controlled LEDS.
Im able to detect the LEDS and controll them perfectly. i2cdetect -y 1 shows 4 ...
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1answer
33 views
Connecting multiple wires to a single GROUND pin?
I'm working on a project for my Intro to Computers class, and I need to light up several LED lights in a row with my Raspberry Pi (Model 4)(Using a breadboard). I'm sorry to say, but I am a beginner (...
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1answer
51 views
Number of SPI devices limited just by CS pins? And pin assignment flexibility question
I've done some research, but not probably not enough, as I'm still confused some.
First of all, I've got a Pi rev 1 Model B (with the 26 pin connector) and two devices: The Waveshare AD/DA board and ...
3
votes
1answer
84 views
Oh no! GPIO again!
I'm working at this source: https://github.com/ozw1z5rd/ninepin/blob/master/iec/iec.c
int iec_init(void)
{
int result;
int minor;
if ( request_mem_region(GPIO_BASE, 4096, LABEL_DEVICE) == NULL ...
3
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3answers
148 views
GPIO vs I2C SMBUS2
This example scans for any I2C slave address current on the I2C bus.
(I am using a RPi 3B+ with raspbian buster from september release)
Script trial_smbus.py:
from smbus2 import SMBus
channel = 1
...
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0answers
52 views
Use a 2.5" LCD in a Blaupunkt Dashcam for Raspberry Pi?
and thank you for reading my topic. I recently bought a "2.5" LCD HD Dashcam" from the Blaupunkt brand (BPDV122), although I am aware they have just used this design from another company.
https://www....
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0answers
34 views
Why do my servos only work the first time
I Posted earlier about having problems with my servos that you guys helped me with and I'm really grateful for that. Now I'm facing an other issue with the servos:
I have put them on my "robot" that ...
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0answers
35 views
Unable to stop motor through GPIO in Python
I'm using an rPi to send a GPIO signal to a servo motor. When I run the program, the motor starts turning, and then continues without stopping, even if the program has terminated through the use of a ...
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3answers
90 views
running a mosfet from 3.3V gpio output
i am running a low side switch with the 3.3V gpio output of the pi, and for the particular transistor i’m using (irf520 ) the 3.3V is barely enough to turn it on - is there some clever positive ...
