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.
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Strange behaviour of 433MHz receiver when catching edge events on GPIO
I have a 5 Volt 433MHz receiver connected to my Raspberry Pi 3 B+. The receiver is directly connected to voltage and GPIO, no resistor or anything else is wired in between. Everything is fine until I ...
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Connecting 40+ transmitter coils to Raspberry Pi
I am currently working on a school project to make the wireless charging platform
from scratch but with more surface for originality. My current design requires 42 transmitter coils and these coils ...
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It is safe to connect the PWM pin of a 4-wire FAN directly to the Raspi PWM output?
I have a 4-wire PWM FAN. The PWM pin it seems to be pulled-up to 12V with a 47k ohm resistor. Now, with this pin floating, it has almost 12V on it. And this pin must be connected to the Raspi PWM ...
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GPIO input pins high at 3V, and detect when ground is connected when I want it to detect when 3V is connected
This is on a Raspberry Pi Zero 2 W
The physical pin 3 and 5 (gpio2 and gpio3) are the input pins I am using and for whatever reason, they are at default 3V and detect a change when they are connected ...
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Undervotage detected while using UPS hat (b) on wheel robot
I am doing a mecanum wheel robot project included 2 motor drivers l298n. I use raspberry pi 4 GPIO to control the motor drivers and my power supply for rpi is an UPS hat (b). I keep receiving ...
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Getting 74 GPIO Pins On a Raspberry Pi Zero [closed]
Is it possible to get 74 GPIO pins on a Raspberry Pi Zero WH? All of them will be connected to buttons, and the Python needs to be able to detect all 74 buttons. I have looked at Getting more than 26 ...
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Problems connecting a servo to raspberry pi 5
I have recently tried to use a servo on a raspberry pi 5 using
import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO.BOARD)
GPIO.setup(17,GPIO.OUT)
p = GPIO.PWM(17, 50)
p....
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Slow pigpio, much slower than RPi.GPIO
I'm developing a system based on Raspberry pi 4B, with a 32-bit Bullseye OS. I'm using pigpio for SPI and GPIO, and I have observed that the delay between command executions is huge. I have run a ...
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Using an i2C OLED display with lgpio and a kernel newer than 5.11
I'm on Ubuntu 23.10 on a RPI 4 and the kernel used here is not compatible with RPI.GPIO because -- as far as I understand -- RPI.GPIO cannot see if multiple processes are trying to use the same pins. ...
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RPi Zero as 4-pin-fan-controller: Faulty RPM readings on open collector with gpiozero
Introduction and Goal
Disclaimer: I do not have profound but basic knowledge in electronics and hardware and my python is a bit rusty. For tl;dr, jump to the problem section below.
Hello,
I'm trying ...
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When I put a bit in GPSET to 1, what is the actual mechanism that "reads" this register and put the electric line to HIGH Voltage? Who does this? How?
I don't know what is the actual mechanism.
When the CPU sets that register(GPSET)'s bit to 1, what entity/element reads that and is responsible to activate the electric line to HIGH? How is this done?
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wiringPi giving "Unable to determine board revision from /proc/cpuinfo" error after kernel 6.1 update
I was using wiringPi to to control the GPIO pins on a Raspberry Pi model 3 and 4b (these originally had Buster installed on them) successfully until today when I did a rpi-update to get kernel 6.1.
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Can I use the Adafruit PiOLED while using the fan pins on the RP4?
I have a feeling I'm not unable to do this but I would still rather ask the more knowledgeable folks just in case I'm either wrong or you happen to have an alternative suggestion.
I have my RP4 on a ...
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Sonic Pi control
I would like to control Sonic Pi via the Rasberry Pi GPIO pins.
For example if a pin goes high, a tone starts playing.
It appears that Sonic Pi can only be controlled on the local machine using OSC ...
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Turn off GPIO fan when the temperature lowers by more than 5 degrees
I am able to trigger my Raspberry Pi 3B's fan to turn on at 50 °C with the following line in /boot/config.txt:
dtoverlay=gpio-fan,gpiopin=3,temp=50000
However, it automatically turns off again when ...
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GPIO 2 Shut Down Not Working
I have a Pi 3B+ with an adafruit matrix bonnet. Im trying to shutdown the Pi with a single pole double throw switch I had laying around. I'm currently able to get the power on working through GPIO 3. ...
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Flash a LED at 27kHz with Precise Timing
I'm trying to flash a LED at 27kHz for a project and using the general GPIO the fastest I can get is around 3kHz. Any library's that would be suitable for this?
# Import the libraries
import RPi.GPIO ...
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Can't read temperature from Adafruit RTD 3 wire sensor and max31865 chip
I'm trying to read temperature from a 3-wire PT100 sensor and max31865 chip.
The chip has the correct jumpers soldered to define it as 3 wire.
I have tried to follow these instructions as closely as ...
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Connecting Two SPI LCD to raspberry pi GPIO pins
I am doing my NEA project right now and I have a problem using 2 TFT LCD. Here are more details about the LCD 2.8" LCD SPI, Driver: ili9341 with touch version 1.2, this a picture of it:
I have ...
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Raspberry Pi GPIO ports extension
I would like to control a large number (hundreds) of GPIO ports with a Rapberry Pi for high voltage applications such as controlling Nixie tubes (but this woulbe be applicable to any kind of GPIO ...
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Trying to make a small games device with Raspberry Pi Zero, help with battery?
I'm trying to make a small retropie emulator with a Raspberry Pi Zero. I would preferable like to make it as small as possible. I am thinking of using this premade HAT for the Pi, as I am not very ...
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Failed to add edge detection - Raspberry Pi 4 GPIO
I am trying to run a LoRa receiver using python
from time import sleep
from SX127x.LoRa import *
from SX127x.board_config import BOARD
BOARD.setup()
class LoRaRcvCont(LoRa):
def __init__(self, ...
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Can I do PiFM, just on 13.56mhz?
I want to broadcast on 13.56mhz from the GPIO pins, just like with PiFM (except PiFM is like 85-105mhz). Is there a simple way to do this? Thank you!
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Many piezo crystals driven by Pi? [closed]
I'm considering starting a new RPI project that will end up being a haptic feedback suit for video games. My thought process so far is that I can embed a lot of piezo crystals inside a vest / jacket ...
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how do i run a script when the cpu gets too hot [duplicate]
i need to send commands to my hats that control fans and a little warning LED if the cpu goes above or below a specified state of temperature
https://unix.stackexchange.com/questions/756721/raspberry-...
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GPIO.event_detected not working though an edge is detected
I am trying to count number of edges detected in a minute.
My code:
global future_time
future_time = (take_present_time()+pd.Timedelta('1m')).strftime('%Y-%m-%d %H:%M:%S:%f')
global ...
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Raspberry Pi 4 - hwclock DS3231 RTC delay at boot
Running a Raspberry Pi 4 with a DS3231 RTC setup.
Everything is setup correctly and working fine and the hwclock is synced correctly.
The unit is running without any internet connection.
The problem ...
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Can a gpio pin be read as an input without voltage going through? [duplicate]
I have pi 3 and I want to use one of the pin as an input. It will be connected to tapped off wires from a switch that has 2 volts going through it when it is closed. So I want to feed this 2 volts as ...
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TFT HSD - 9190J-D1 connection to Raspberry Pi model B
I have Raspberry Pi 4 Model B
I want to connect SPI TFT 4" LCD HSD-9190J-D1 using GPIO pins.
Kindly help me up with proper connections and necessary drivers required for the LCD to work as ...
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How to access GPIO pins status within freepascal or Lazarus?
I wrote a program using Lazarus and it checks for GPIO2 pin's status every 3 seconds using TProcess component to run a terminal command for retrieving GPIO pin status as follows...
procedure TForm1....
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How Can I Expand The GPIO / Pin Quantity When A PiSound is Installed on the RPI4?
I'm working on creating a musical synthesizer and the sound engine requires a Raspberry Pi 4 + PiSound. From what I can gather, the PiSound is placed right on top of the RPI4 and uses its GPIO pins.
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Why does this GPIO button click run twice if I remove the print statement?
I run this script when the Raspberry Pi boots. When a key is pressed (GPIO 19) the interrupt function gets called.
If I remove the print("BUTTON PRESSED") statement on line 10, the interrupt ...
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Connecting a wire to GPIO 18 (PWM) changes the state of GPIO 23
I have a circuit with a Schmitt trigger connected to GPIO 23 (on a Raspberry Pi Zero W).
It should give a high (3.3V) signal when there is an AC current on the other side of the circuit.
If there is ...
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Does Pi draw more power when GND is connected to pin 16?
Strange question perhaps, but I was wondering if anyone knows if a Pi would in theory consume more energy when the GND pin is connected to pin #16? I have an interactive piece of software running on ...
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Is it possible to use both interrupts and ADC on the same pin of the RPi Pico?
In order to use the Raspberry Pi Pico ADC on a pin, the adc_gpio_init function is used, which disables all digital functions (https://www.raspberrypi.com/documentation/pico-sdk/hardware.html#...
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Using 5V and ground for fan with PoE+ HAT
I have a 10" rack with 5 rpi 4B devices. All rpis have a PoE+ HAT. The rack supports the addition of 2 fans, which each require a 5V and ground connection.
I noticed that the GPIO pins don't ...
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Using a signal intended for piezo as GPIO button-like input
I'm pretty new to raspberry pi, and have fairly entry-level circuitry knowledge. For this project, I'm using a raspberry pi zero w. I'm putting this question in this stack exchange because I'm hoping ...
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Raspberry Pi 4B giving 0.3V output when GPIO is set to True or High
I have a Raspberry Pi 4B, 4GB version. When I try to run the following code it gives 0.3V output. I mean it works, on-0.3V, off-0V. But I need 3.3V output. I measured it with a voltmeter, as the ...
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Code for reading values from ML8511 and MQ131 sensors
I'm looking for a way/libraries to read the values from the ML8511 and MQ131 sensors with a MCP3008 ADC on Raspberry Pi 3B using Python.
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Connecting 15/21V to GPIO to read an on/off state
I am working with GPIO where I want to read a vacuum sensor's output voltage.
Using a voltmeter from the output to the pi's ground, I measured the voltages.
ON State: 21V
OFF State: 15V
I know that ...
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Canonical means of translating pin identifiers in Python?
[Python, at least for now.]
Is there a standard way to translate between the various naming formats for RPi GPIO pins? I.e., given a pin identifier in one of these forms: "BOARDn", "...
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(Quick Help Please) I accidentally plugged the Positive wire into GND and the Negative wire into 5v GPIO
I have a fan that I was trying to plug into my Raspberry Pi 4 (4gb) (Deskpi lite addition from "Geeekpi")
I was plugging it in, but didn't realize I accidentally plugged the red/positive ...
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Can the CM4 module be used without IO board?
I want to use CM4 as companion computer to my drone's flight controller. Can I power board and use the GPIO outputs without any IO boards, just module itself? I don't want to carry non-necessary ...
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DS18B20 not detected on Raspberry Pi [duplicate]
In ls /sys/bus/w1/devices/ I only have w1_bus_master1
I have added w1-gpio and w1-therm in /etc/modules
I have also added dtoverlay=w1-gpio in /boot/config.txt
I am not sure what is wrong. The RP 4 ...
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5-inch display GPIO to female HDMI socket converter
I hope you are well.
I have a 5-inch display that only has GPIO for connecting to raspberry pi and there is no other port.
how can I make a converter that connects to this display and give me a female ...
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8-relay board wiring to Rpi using GPIO
As small question about a relay board.
I have a couple of those cheap aliexpress relay boards I need to use in a project.
I looked for hours online in various tutorials, but I cannot seem to find a ...
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GPIO behaviour on booting RPi
I have a question regarding the GPIO status during the boot process.
As a bit of background, I'm currently building an automated sprinkler setup using a raspberry pi and an 8-relay board.
The board ...
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did I fry Raspi I2C pins?
So I wanted to test a sensor I have on the pi, the sensor has on-board level switchers supports both 5V and 3.3V with a 10k pull-up resistor for both SCL/SDA, Mistakenly I wired the Vin into the 5V ...
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Using multiple IR receivers on a raspberry pi with LIRC
I'm trying to create a DIY laser tag/game and I want each player to wear multiple targets, but I can't find a tutorial that explains how to use multiple IR receivers.
I just need to be able to know if ...
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How to interface 6 HC-SR04 ultrasonic sensors rasberry pi
I am a beginner to Rasberry Pi and working on a parking warning system for a go-kart. The plan is to use 6 ultrasonic sensors (3 at the front of the kart and 3 at the back) to achieve distance ...
