I am new to programming and doing a simple academic project with Raspberry Pi, I have a script which will monitor the changes of database and output the change with 2 different color LED.

I want it to be executed everytime raspberry pi reboot and SSH is not logged in. Currently I have added the task in crontab but it's not executed when reboot. When I run in SSH command line, it works and when i logout PuTTY, it stop.

I have another script in crontab which working well when Pi reboot

My python script


import MySQLdb

import RPi.GPIO as GPIO
import time
GPIO.setup(38,GPIO.OUT) #red(away)
GPIO.setup(40,GPIO.OUT) #green(home)

while True:
    db = MySQLdb.connect(host="localhost", user="ssss", passwd="sssss"$

    #cursor for select
    cur = db.cursor()

    cur.execute("SELECT status FROM home_mode ORDER BY id DESC LIMIT 1")
    last_status = str(cur.fetchone())
    if last_status == "('HOME',)":
            GPIO.output(40, GPIO.HIGH)
            GPIO.output(38, GPIO.LOW)
    elif last_status == "('AWAY',)":
            GPIO.output(40, GPIO.LOW)
            GPIO.output(38, GPIO.HIGH)
            print "WRONG"


The coding maybe very poor because I am really new in python even programming. Hope anyone could give solution/advise, thank you.

migrated from stackoverflow.com Oct 27 '16 at 12:43

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A better choice would be to use systemd and its associated systemctl command.

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