Shutdown and restart

[Tall Person]

Hi guys,
So in Raspian i managed to add a switch to a GPIO port and a python script to shutdown or restart the Pi. I found a script that worked and then modified it to suit my needs.

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sudo apt-get install python-dev 
sudo nano /home/pi/offswitch.py

Then paste in the following text:

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from time import sleep
import os
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(25,GPIO.IN,pull_up_down=GPIO.PUD_UP)
btn_timer=0
while True:
    if ( GPIO.input(25) == False ) :
        btn_timer = btn_timer+1
    else:
        if ( btn_timer > 5 ) :
            os.system('sudo shutdown -h now &')
        elif (btn_timer > 2) :
            os.system('sudo reboot &')
        elif (btn_timer > 0.5) :
            os.system('sudo ifup wlan0 &')
        btn_timer = 0
    sleep(0.5);


CtrlX to save and exit

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sudo chmod -x offswitch.py
sudo python /home/pi/offswitch.py


The possibilities could be extended based on the duration of button press to activate other commands like restarting the wireless controller as per my last command. Now in the Runeaudio build I am struggling to know how I could implement the same procedure. Could someone please advise if the python install and script above would still work, the locations to install, etc?

[hondagx35]

Hi Raoul,

on my latest images python is installed by default.
If this is not the case for the image you are using, you have to install it with pacman.
Pacman is the packet manager for ArchLinux.

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pacman -S python2

See also this.

Frank

[Tall Person]

Thanks Frank. Do I save my files in the same locations as above?. I'm using the 0.4 version from janui and the command is not recognised so I assume it is not installed. I did find a python3.4 folder but the command did not run.within the folder either.

[janui]

Frank & Raoul,
I have tested python2 with the zero build. It works fine, install with:

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pacman -S python2

janui

[rern]

RuneAudio 0.3:
python 2.7 - symlink: python2

fix 'python: command not found'

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ln -s /usr/bin/python2.7 /usr/bin/python


RuneAudio 0.4b:
python 2.7 - symlink: python2
python 3.6 - symlink: python, python3

[Tall Person]

I do not appear to be able to get my original code to run with Python2.

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from time import sleep
import os
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(25,GPIO.IN,pull_up_down=GPIO.PUD_UP)
btn_timer=0
while True:
    if ( GPIO.input(25) == False ) :
        btn_timer = btn_timer+1
    else:
        if ( btn_timer > 5 ) :
            os.system('sudo shutdown -h now &')
        elif (btn_timer > 2) :
            os.system('sudo reboot &')
        elif (btn_timer > 0.5) :
            os.system('sudo ifup wlan0 &')
        btn_timer = 0
    sleep(0.5);

This file is called offswitch.py and saved in the root folder. When I run

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python2 /root/offswitch.py

i get the following message when i press my button on the pi:
sh: sudo: command not found

Does this mean that the code is recognising the button press, but not the code above? What do I need to change for Python2?

[hondagx35]

Hi Tall Person,

i get the following message when i press my button on the pi:
sh: sudo: command not found

On Rune there is no "sudo" installed and also not needed.
Remove "sudo" from your code:

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os.system('sudo shutdown -h now &')

to

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os.system('shutdown -h now &')

Frank

[Tall Person]

Frank, thanks. I can't believe I missed the sudo command was still in the code from my earlier working version with raspian debian....!
I'll have a look later and see if that solves the problem.