Python script to restart a Raspberry Pi

Question

I think what I want is straight forward.

Python script to restart my Raspberry Pi after 23 hours and 59 minutes. The reason I am trying to do this, instead of set times with a cron job, is the Pi has no onboard battery for a clock so I don't care what the time is (if connected to internet, it will source current time), just a count down of 23 hours and 59 minutes from the script starting.

This is as far as I have got;

def restart():
SendEmail = SendEmail "SYSTEM RESTART", "ncam.py auto restart initiated"      msg['Subject'], body)
command = "/usr/bin/sudo /sbin/shutdown -r now"
process = subprocess.Popen(command.split(), stdout=subprocess.PIPE)
output = process.communicate()[0]

Also I want to send an email to myself with the set parameters as above.

Just a thought why not create a cron job (or the alike) and execute a python command that will restart your Pi? Otherwise (like below) you have to have a python keep looping and I'm not sure how much cpu/memory it would take up just to run that script. — Class
– Class, Commented Sep 2, 2013 at 6:50
why not use a shell script with a sleep $nearly_a_day; reboot;? — mnagel
– mnagel, Commented Sep 3, 2013 at 10:54

stmfunk · Accepted Answer · 2020-08-13 12:26:48Z

5

You are going to want some variant of this:

 import time
 import os
 currentTime = time.time()
 tomorrow = currentTime + 86340000
 while time.time() < tomorrow:
     do.yourCode()
    
 os.system("poweroff")

Put something like that in your function and it will do what you want.

edited Aug 13, 2020 at 12:26

answered Sep 1, 2013 at 16:24

stmfunk

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1 Comment

Greenonline Over a year ago

while time.time() < tomorrow. See rtv's answer

Prasan Dutt · Accepted Answer · 2016-01-17 17:27:40Z

3

You can simply restart raspberry with 'sudo reboot' command. Just put this command inside a python code and run it as system command. For example this code count down from 1 to 10 before restart:

import time
import os
for i in range(1,10):
       print 'hello',i
       #Do your code here
       time.sleep(1)
os.system("sudo reboot")

Use this method to countdown whatever time and restart pi.

answered Jan 17, 2016 at 17:27

Prasan Dutt

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Comments

rtv · Accepted Answer · 2014-11-20 08:50:21Z

2

You should probably change to

while time.time() < tomorrow

to avoid any potential "miss" of the exact millisecond to match.

answered Nov 20, 2014 at 8:50

rtv

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1 Comment

Greenonline Over a year ago

Whilst you are correct (and I must admit that I thought the same), this looks like it is a comment to stmfunk's answer

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