RPi4 GPIO using in LibreELEC

I've been installed a power button and a status LED on my RPi3B+. This works for RPi4B, too. After SSH login, you can use the nano editor to create or edit all necessary files.

Power Button Hardware Part

Use GPIO03 (Pin #05) and the opposite Ground (Pin #06) to connect a push button for power on / off.

Power Button Scripting Part

Add dtoverlay=gpio-shutdown to config.txt.

Switching off will let the shutdown menu appear.

To shutdown instantly instead, create this /storage/.kodi/userdata/keymaps/keyboard.xml:

<keymap>
    <global>
        <keyboard>
            <power>shutdown</power>
        </keyboard>
    </global>
</keymap>

Status LED Hardware Part

Use GPIO13 (Pin #33) and the opposite Ground (Pin #34) to connect an LED. Also use a resistor with 330 Ohms or more.

Status LED Add-On Part

Install the Raspberry Pi Tools add-on to use the GPIO programming library in Python.

Status LED Scripting Part

The status LED will be triggered from autostart.sh, which calls the Python script status_led.py . It will switch off automatically at shutdown, no script action required for this part.

Create this /storage/.config/autostart.sh :

#!/bin/sh

(
    python /storage/scripts/status_led.py
) &

Create this /storage/scripts/status_led.py :

#!/usr/bin/python

import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
import RPi.GPIO as GPIO

# Replace YOUR_CHOSEN_GPIO_NUMBER_HERE with the GPIO pin number you wish to use.
# Make sure you know which rapsberry pi revision you are using first.
# The line should look something like this e.g. "gpio_number = 7".
led_gpio_number = 13

# Use BCM pin numbering (i.e. the GPIO number, not pin number).
# WARNING: this will change between Pi versions.
# Check yours first and adjust accordingly.
GPIO.setmode(GPIO.BCM)

# Switch LED on.
# LED will switch off automatically at shutdown by using normal GPIO state.
GPIO.setup(led_gpio_number, GPIO.OUT)
GPIO.output(led_gpio_number, True)

Reboot.

Quote from cat2115

1. Can I add "dtoverlay=gpio-shutdown" in config.txt from SD card while it's plugged to desktop using Notepad++

Yes.

Quote from cat2115

2. The pin 33 and pin 34 will work for ON/OFF plus led status?

No, that's just for the LED. Use pin 5 and 6 for the power button. If you only want the power button, then you can ignore the LED part.

Quote from cat2115

3. For the executed command (chmod +x ), is there a way without the need command from terminal? Like, right click the file (.py & .sh) and change something in Properties?

On a Linux PC (maybe OSX, too), making files executable by right-click-option should work fine. You maybe need root status to do this. I'm not 100% sure whether chmod +x is necessary, so you can try it without this step first.

Quote from cat2115

is "/storage" mean there's a folder inside SD card name "/storage"?

When you plug the microSD card into your desktop PC, then the /storage folder will be represented by the STORAGE partition.

Quote from Allissonhsp

Hello friends ! for two days i am trying to put the power button on my rpi 4b + libreelec 9.02 following this tutorial but it is not working! I need help, I did everything as described so I could not put the files as executable because the command described generates an error !! what do I need to do? when I press the push button nothing happens!

Foxbiker and Da Flex

Please show the command you try and the error message you get.

Quote from Allissonhsp

Is the command in the config.txt file correct?

dtoverlay=gpio-shutdown is all you need to use GPIO 03.

You did a typo, it's chmod +x, not chmod + x.

LE does the firmware update. If you do it yourself, then stuff like a change of the config.txt syntax can happen. So I don't suggest this.

Is there any cause why you don't update to the latest LE version?

Quote from Allissonhsp

I updated the boot firmware and not the LE!

That's what I mean, too. LE updates include boot firmware updates, whenever necessary.

You can verify script execution by creating a file. Do an internet research to learn how to do so.

I can only continue to help you, if you answer my questions. Investing energy to get the latest boot firmware, but ignoring LE updates is a mismatch to me. LE updates are more important to get stability and best performance.

If you did a typo like at chmod +x, you should inform us about it's correction. Other users will benefit while reading the thread.

Mario77 No, the dtoverlay implementation only does the shutdown, no reset by long-press. I did a test to be sure.

Here is the original implementation that I used before dtoverlay. You can implement reset by long-press easily from there:

#!/usr/bin/python

# This script was authored by AndrewH7 and belongs to him.
# (www.instructables.com/member/AndrewH7)
# You have permission to modify and use this script only for your own personal usage.
# You do not have permission to redistribute this script as your own work.
# Use this script at your own risk.

import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
import RPi.GPIO as GPIO
import os

# Replace YOUR_CHOSEN_GPIO_NUMBER_HERE with the GPIO pin number you wish to use.
# Make sure you know which rapsberry pi revision you are using first.
# The line should look something like this e.g. "gpio_number = 7".
button_gpio_number = 3
led_gpio_number = 13

# Use BCM pin numbering (i.e. the GPIO number, not pin number).
# WARNING: this will change between Pi versions.
# Check yours first and adjust accordingly.
GPIO.setmode(GPIO.BCM)

# It's very important the pin is an input to avoid short-circuits.
# The pull-up resistor means the pin is high by default.
GPIO.setup(button_gpio_number, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(led_gpio_number, GPIO.OUT)

# Switch LED on.
# LED will switch off automatically at shutdown by using normal GPIO state.
GPIO.output(led_gpio_number, True)

# Use falling edge detection to see if pin is pulled low to avoid repeated polling.
# Send command to system to shutdown.
try:
    GPIO.wait_for_edge(button_gpio_number, GPIO.FALLING)
    os.system("shutdown -h now")
except:
    pass

# Revert all GPIO pins to their normal states (i.e. input = safe).
GPIO.cleanup()

Mario77 Yes, that's right. I use a resistor with the LED, but I forgot the value. You'll find on the web, how to connect an LED to GPIO.