How to Get Python Shutdown GPIO/Button Script to Start at Boot on Orange Pi Zero

rlsten · March 26, 2017

Hi,

I am a newbie to Armbian so I apologize if this is a stupid question. I am running Armbian legacy.

I think I have successfully programmed a GPIO shutdown button for the Orange Pi Zero by cobbling together information from this and the Orange Pi forum. My script goes like this, in file hw_shutdown.py:

#!/usr/bin/env python

import os
import sys
import subprocess

if not os.getegid() == 0:
    sys.exit('Script must be run as root')

from time import sleep
from subprocess import *
from pyA20.gpio import gpio
from pyA20.gpio import connector
from pyA20.gpio import port


button_shutdown = port.PA2  #PIN 20

"""Init gpio module"""
gpio.init()

"""Set directions"""
gpio.setcfg(button_shutdown, gpio.INPUT)


"""Enable pullup resistor"""
gpio.pullup(button_shutdown, gpio.PULLUP)

def delay_milliseconds(milliseconds):  
    seconds = milliseconds / float(1000)
    sleep(seconds)  

def run_cmd(cmd):  
   p = Popen(cmd, shell=True, stdout=PIPE, stderr=STDOUT)  
   output = p.communicate()[0]  
   return output  

shutdown_pressed = 1
while True:
   value_out = 0
   shutdown_pressed = gpio.input(button_shutdown)
   
   if (shutdown_pressed == 0):
      value_out = 1
      run_cmd("shutdown now")

   delay_milliseconds(100)

What I would like is to have this script run at boot. I tried adding

python /root/hw_shutdown.py

before exit 0 in /etc/rc.local, but nothing happened.

In arch linux on the raspberry pi I created a service to run this type of script, but I don't know how to do that on Armbian.

Any ideas what I should do?

Thanks,

Rod

Edited March 26, 2017 by rlsten
errors in code

martinayotte · March 27, 2017

When adding any thing in /etc/rc.local, you need to make sure it done as a subprocess, not block /etc/rc.local from exiting.

So, you should call your script similar to :

nohup /usr/bin/python /root/hw_shutdown.py &

rlsten · March 29, 2017

On 27.03.2017 at 8:59 PM, martinayotte said:
When adding any thing in /etc/rc.local, you need to make sure it done as a subprocess, not block /etc/rc.local from exiting.

So, you should call your script similar to :
nohup /usr/bin/python /root/hw_shutdown.py &

Thanks very much,

Rod