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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26 views
How do I pause a python program and then wait if no signal is received to a GPIO pin?
I'm developing a datalogger using a Raspberry Pi 3B+. I have 2 separate square wave signals connected to two separate GPIO pins and some code to record and store the date and time of each transition ...
0
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2answers
22 views
Restore UART pins 8 & 10 after GPIO.cleanup() without reboot
A Raspberry Pi 3B+ is talking to an STM32 chip via UART over pins 8 (TXD) & 10 (RXD). When I take control of those pins using GPIO.setup(8, GPIO.OUTPUT); GPIO.output(8, GPIO.LOW); and later ...
2
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2answers
36 views
How to stop python script that was started with crontab reboot
I have a python script that continuously saves data to a CSV file and is started as soon as the Pi starts up using crontab reboot. Does anyone know how I stop the script from within the Raspberry Pi ...
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0answers
23 views
Measure the time of the relay on
I have python code, where the state of the relay changes throughout the day.
I want to measure the time of the relay on and off...
I try this code, but not work, count all time....
I want when change ...
-2
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0answers
50 views
false trigger on GPIO setup
I have a relay connected to a GPIO output of my raspberry 3 B. As soon as I start the setup the relay goes open and shut in a breeze. I need to avoid this behaviour.
I'm using rpi-gpio in my NodeJS ...
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1answer
27 views
How do I stop CSV file being overwritten when rebooting Raspberry Pi 3B+
I have some code (shown below) which turns the Raspberry Pi into a datalogger. I use GPIO.add_event_detect to detect the date and time that a square wave signal changes state. This data is then saved ...
0
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1answer
354 views
RuntimeError: Failed to add edge detection. GPIO.BOTH Raspberry Pi datalogger
I am coding a datalogger using a Raspberry Pi and am starting to test my code but now keep getting an error saying 'RuntimeError: Failed to add edge detection'. Here is my code:
import RPi.GPIO as ...
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1answer
63 views
Datalogging square wave signal using GPIO.BOTH
I'm currently making a datalogger using a Raspberry Pi which will record the real time and date of each falling and rising edge (GPIO BOTH) of a square wave signal (going through one input port). The ...
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1answer
17 views
Modifying input of HID via GPIO of PI (unless there is a better way?)
Basically I want to control the input of a USB HID via one or more other HIDs.
I know there are commercial options available to do this however they are closed source and expensive. I'd like to get ...
0
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1answer
43 views
How can I control a 12V solenoid door lock - Pi Zero
I have a solenoid door lock that requires 3 different voltages to operate
- Unlocked Idle: Requires low voltage (6V) that'll hold the solenoid seated
- Locked: No power (0V)
- Unlock: 50-100ms ...
1
vote
1answer
28 views
UART RX stops reading data after working correctly
I'm trying to read an continuous stream of data from my device (laser altimeter). The device is connected to the UART Rx pin of raspberry Pi 3B+.
Everything works fine with this python code:
import ...
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0answers
23 views
Digital weight scale callibration
I have built a digital scale, similar to the one explained here, using four 50Kg load cells forming the Wheatstone bridge. The following two steps give experiments give me different output which I do ...
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1answer
16 views
GPIO.input(24) is coming back True when it shouldn't be (false button presses)
I have a button in a working circuit. Within sys/class/gpio/gpio24, value changes properly (it becomes 1 when pressed down, 0 otherwise).
When I use GPIO.setup(24, GPIO.IN) within python, GPIO.input(...
0
votes
1answer
30 views
Why Raspbian jessie version 8 won't allow communication through GPIO serial pins?
I am running Raspbian Jessie 8 on Raspberry 3 and I followed the answer to the question Why my program won't communicate through ttyAMA0 on Raspbian(jessie)? But I still can't get my program to ...
2
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1answer
33 views
LED not blinking
Raspberry Pi Zero Wireless
I have a Pi Zero connected to a breadboard using the GPIO Extension Board and ribbon cable.
I have followed several of the basic blinking LED tutorials.
One jump cable is ...
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0answers
110 views
RPi.GPIO - Properly Wiring and Setting Up Pins for Button Inputs
Edit: Breadboard, schematic, and code updated.
I accidentally fried my Pi by shorting it out through the GPIO pins, so I figured it would be a good idea to ask for some help before trying my current ...
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1answer
32 views
python basic problem in developing raspberry pi 3 GPIO skill
this is a part of a code for picroft skill:
def handle_command_intent(self, message):
if message.data["command"].upper() == "BLINK":
self.speak_dialog("ledblink")
the "data" and "...
0
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1answer
43 views
Writing to GPS HAT on Raspberry Pi Zero W Never Returns Anything
I have attached a GPS HAT to a Raspberry Pi Zero W running RASPBIAN STRETCH WITH DESKTOP. When I SSH in to run a simple Python script that writes to the HAT serial port, nothing happens and I am not ...
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0answers
46 views
Problem counting pulses
I want to count pulses and find the frequency. Here is the picture of pulses from the oscilloscope:
Obviously, frequency is around 1/2.3 ms = 420 Hz.
First I tried this program:
import RPi.GPIO as ...
0
votes
2answers
45 views
Raspberry Pi Detects I2C Device Sometimes
I have my MPU-92/65 connected to my Raspberry Pi and it's sometimes detected but not always.
$ i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -...
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0answers
26 views
gnd pin to a gpio
My pi was on a robot and a ground wire of the battery back that was driving the motors accidentally touch a gpio pin on the pi. After that my pi began heating up whenever it's plugged in. Is my pi ...
1
vote
1answer
32 views
Controlling electromagnets in clock display
I have an electromechanical 7-segment clock display with each segment controlled by an electromagnet. A segment is 'on' depending on the polarity of the last pulse to its electromagnet.
Can anyone ...
1
vote
1answer
80 views
Use Raspberry Pi GPIO to sync multiple video players. Possible?
Is it possible to use GPIO to sync multiple RasPi video players?
As shown in the picture below, I need to sync 16 RasPi video players. The master RasPi will trigger the video players (start, stop, ...
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0answers
22 views
How to create installer files in Raspberry pi
I have created a program in Raspberry pi and I am running it using the command python myprogram.py . Is it possible to create the installer file of this program? that means after installing this ...
2
votes
2answers
356 views
How fast can GPIO pins toggle?
I'm currently using Python's RPi.GPIO module to toggle some pins, and I want to know how quickly it can do this. I need the pins to be toggled on the schedule of a ~50 mhz FPGA clock, which I'm ...
0
votes
1answer
253 views
ImportError: No module named 'RPi'
I am trying to make a humidity sensor using this code
import RPi.GPIO as GPIO
import dht11
import time
import datetime
# initialize GPIO
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.cleanup()...
0
votes
1answer
154 views
Read GPIO pin on web page
I was able to control an led from a web page using the following code. when I call http://myip/pinon.php it will light up the LED and http://myip/pinoff.php will turn off the LED.
pinon.php
<?php
...
2
votes
2answers
194 views
Short pulse detection about 35ms, is it possible
I got somewhat short pulse 35ms, I written script in python using RPi.GPIO, using event and callback. Is it possible to detect so short pulses? On related question how close to 3V3 I need to get? I ...
0
votes
1answer
103 views
Get measured value of gpio vibration sensor (SW420)
I've managed to connect 2 SW420 vibration sensors to my rpi3 and can identify a vibration event on callback.
However, I'd like to get the measured value (voltage change?) from the sensors, to see ...
1
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0answers
28 views
pigpio monitor GPIO not detecting change correctly
I am having trouble detecting a level change on pin 16 (or any other pin). My script is as follows:
import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO.BOARD)
GPIO.setup(16, GPIO.IN, ...
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0answers
95 views
Issue with FC-51 IR sensor
I am developing a robot with raspberry pi. To detect obstacles I am using FC-51 IR sensor. This is my current code.
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
ObstaclePin = 18
...
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votes
1answer
519 views
Which is the standard python library for Rpi other than GPIO library? [closed]
Which python library is best one to use for programming RPI? I want to program RPI zero and Rpi 3 model B+ using python.
I know that there is a GPIO library available for RPI. However, in its readme ...
1
vote
2answers
81 views
Testing my low frequency generator
I have my pi hooked up to a shaking device, and I'm looking to drive it at relatively low frequencies. My code looks like this:
# Import the necessary header modules
import RPi.GPIO as GPIO
from time ...
0
votes
0answers
39 views
Is there a python coding method for reading the value of a GPIO pin
Recently I have been learning to prototype circuits on a couple devices, as I am inspired to one day design and develop embedded systems.
The two devices that I have been prototyping with are the AVR ...
0
votes
1answer
133 views
Python Adafruit DHT11 error
I have a very simple Python program on my RPi0W to display DHT11 Temp and Pressure readings using SSH. I'm planning to build on it to develop a data logger using MySql. I tested the program and it ...
0
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0answers
83 views
GPIO mode in another file B different from the file A
I face a problem.
File B has import from gpiozero which controls LED. The default GPIO mode is a BCM. While in file A, it allows NFC reader to read card which imports MFRC522.
However, MFRC522 gpio ...
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0answers
20 views
Help with multiple inputs and responding to how long the inputs have been active
I'm using python 2.7.13 on a Raspberry Pi 3
The goal of my program is to send an email when an input is received (input goes low and I'm using software pull-ups) and then send out another email with ...
0
votes
3answers
412 views
Powering RPI 3 and using relay from same source
I want to build something of a smart home device such as a smart switch /outlet for example that controls something like a light. However, I don't know what the wiring should be Like, if it's possible....
0
votes
1answer
18 views
GPIO.event_detected() Python3 IDLE vs Shell execute startup
I have a script with GPIO.event_detected(port) to count number of times a hall effect sensor is initiated. My script works amazing when executed in python3 IDLE run module. Counts are accumulated per ...
0
votes
1answer
150 views
Cannot execute Python3 RPi.GPIO import from shell/rc.local
I have a python script with import RPi.GPIO as GPIO. When I execute in my Raspberry Pi3 Python3 IDLE, it runs just fine with no issues.
If I launch the script with shell pi@my_user_name, it says "no ...
1
vote
1answer
590 views
Cloning RFID tags with Raspberry Pi 3 and RC522?
I've looked around a lot now and can barely find any information on how to clone RFID tags with the Raspberry Pi, I've seen plenty of content on how to do it using an Arduino but I would really rather ...
1
vote
2answers
152 views
Check relay module state
I found a few good answers and guides about how to control a relay module from the pi, however, I want to find a way to check its state/status from the pi, is there a way to determine if the relay is ...
0
votes
2answers
237 views
Open/Close Sliding Gate Using Raspberry Pi and Python
This is my first Raspberry Pi project. I’m a bit of a noob at the Pi, Python and other types of programming languages, as well as circuits and such. I’m trying to open my sliding gate to the entrance ...
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1answer
335 views
3.3 V and 5 V pins shorted — is the Pi dead?
I am new to Pi development now while working suddenly the cable wires of pin1 (3.3 V) and pin2 (5 V) got in contact for a short time then the Pi shutdown. When I turn it back on, only the LED red is ...
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1answer
65 views
Pi 3 reboots when GPIO 13 is given 3V
simulate this circuit – Schematic created using CircuitLab
I am taking the 3V from Pi and giving it to COM of a relay.
The NO goes to GPIO 13 of the same Pi.
I have a 120V line that triggers ...
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0answers
24 views
Pin on off engine javascript nodejs
I have a little engine linked at pin 1 and 3.
How can I turn it on and off throught nodejs?
Is there also a way to control how many volts are sent (to make the engine faster or slower)?
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0answers
20 views
How can I make a web UI where the user can set time to trigger an output pin in nodejs?
I am running nodejs webserver on my raspberry pi 3 and I want to create a user interface where the user can set a specific time of a day and trigger an output on that particular time. I have tried ...
3
votes
1answer
69 views
My PIR sensor seems alittle keen to sense things
Before you tell me answers for my issue already exist I'd like to mention that I have checked previous answers and where similar issues have occurred I have tried to use their approved answer. So far ...
2
votes
1answer
407 views
Real time audio input for use in Python program
I am working on some audio manipulation with my RPI and have a question on how I should process the signals. Right now I have a USB adapter with an Audio In and an Audio Out. What I would like to do, ...
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1answer
61 views
Dynamically set a timer for a GPIO event? — Using Flask + RPi to control a shop fan
I have a big fan in my shop that I can control via a quick and dirty Flask API i wrote that runs on the pi that controls my fan.
I have a web app on my main server (also Flask) that I use to control ...
