Power on / off your PC with raspberry pi

In my home environment, my main windows machine is always running, and I also run pi for a quick test. There is one ubuntu machine with the main machine down for heavy processing and testing, and although it is powerless, it has a GTX650. Most of the time, it's pretty much in the cloud, and if you keep it running, the electricity bill will be high and the room will get hotter, so I hardly move it. But sometimes I use it when I need GPU or machine power. Also, when I was using it from the outside and hung it, nothing happened, so I wanted to do something about it.

So, I created a unit and a script that can turn the power on and off directly from pi.

A little explanation

• GPIO operations use the RPi.GPIO module.
• Use subprocess because you can easily check the ping. (In my case, the port is closed, so I really have to check it with SSH.)
• When the power is turned on, I try to wait a little longer (about 2 minutes) before pinging.
• The sample uses pin 16.
• Firmly release GPIO at the end of the script.

code

power.py

#!/usr/bin/env python

import RPi.GPIO as GPIO
import time
import subprocess

#out put gpio pin
OUTPUT=16

#host ip
HOST="Destination IP"

#initialize
def init():
        GPIO.setmode(GPIO.BOARD)
        GPIO.setup(OUTPUT,GPIO.OUT,initial=GPIO.LOW)

#finalize
def finalize():
        GPIO.cleanup()

#gpio power on
def on():
        GPIO.output(OUTPUT,GPIO.HIGH)
        time.sleep(2)
        GPIO.output(OUTPUT,GPIO.LOW)

#gpio power off
def off():
        GPIO.output(OUTPUT,GPIO.HIGH)
        time.sleep(10)
        GPIO.output(OUTPUT,GPIO.LOW)

#ping check
def ping_check():
    pcheck = subprocess.Popen(["ping", "-c", "1", HOST],stdout = subprocess.PIPE,stderr = subprocess.PIPE )
    time.sleep(10)
    pcheck_out, pcheck_error = pcheck.communicate()
    out_line = pcheck_out.split("\n")
    for i in range(0,len(out_line)):
        print out_line[i]
    if "1 received, 0% packet loss" in pcheck_out:
        print "ping success!!"
    else:
        print "--ping fail--"

#power on main
def power_on():
        print "power on y/n"
        input_line = raw_input()
        if input_line == "y":
                print "power on please wait"
                on()
                time.sleep(120)
                print "ping check please wait"
                ping_check()
        elif input_line == "n":
                print "power on cancel"
        else:
                print "input error"

#power off main
def power_off():
        print "--CAUTION---"
        print "power off? y/n"
        input_line = raw_input()
        if input_line == "y":
                print "power off please wait"
                off()
                print "ping check please wait"
                ping_check()
        elif input_line == "n":
                print "power off cancel"
        else:

                print "input error"

#main
if __name__ == '__main__':
        try:
                init()
                print "please input power on/off "
                input_l = raw_input()
                if input_l == "on":
                        power_on()
                elif input_l == "off":
                        power_off()
                else:
                        print "input error"
                finalize()
        except:
                finalize()

circuit diagram