Daily CPU and harddisk status updates on Raspberry PI by mail

Very useful script to daily status updates of CPU temperature and attached HDD on your Raspberry Pi.
To create a script copy the code and make a file with command:

 cd to /path/you/prefered/  
 sudo nano nameofscript.py #this wiil create blank file and paste code   

CODE:

 # coding=utf-8  
 import os  
 import smtplib  
 import statvfs  
 from datetime import timedelta  
 from email.mime.text import MIMEText  
 #Read the systems uptime:  
 with open('/proc/uptime', 'r') as f:  
   uptime_seconds = float(f.readline().split()[0])  
 # At First we have to get the current CPU-Temperature with this defined function  
 def getCPUtemperature():  
  res = os.popen('vcgencmd measure_temp').readline()  
  return(res.replace("temp=","").replace("'C\n",""))  
 # Now we convert our value into a float number  
  temp = float(getCPUtemperature())  
 #Read the statistics of the drives in bytes and convert to Gigabytes (using the mount points)  
 GB = (1024 * 1024) * 1024  
 HDD = os.statvfs ("/media/SERVICE")  # in my case is mounted to /media/ , name is SERVICE  
 HDD = (HDD.f_frsize * HDD.f_bfree)/GB  
 #HDD1 = os.statvfs ("/media/HDD2")  
 #HDD1 = (HDD1.f_frsize * HDD1.f_bfree) / GB  
 # Enter your smtp Server-Connection  
 server = smtplib.SMTP('smtp.gmail.com' , 587)  
  #if your using gmail: smtp.gmail.com  
 server.ehlo()  
 server.starttls()  
 server.ehlo  
  # Login  
 server.login("yourmail@gmail.com" , "yourpassword")  
 # Now comes the Text we want to send. It will send the System Uptime, the CPU Temperature and the free space of your hard drives:  
 value = "System Uptime (hh:mm:ss) is: " + str(timedelta(seconds = uptime_seconds)) + "\n" + "CPU Temperature is: " + getCPUtemperature() + "C " + "\n" + "HDD Free Space: " + str(HDD) + " GB"  
 msg = MIMEText(value)  
 # The Subject of your E-Mail  
 msg['Subject'] = "Daily Raspberry Pi Status" #you can wtite everyting you prefer   
 # Consigner of your E-Mail  
 msg['From'] = "Raspberry Pi"  
 # recipient of your E-Mail  
 msg['To'] = "receivermail@gmail.com"  
 # Finally send the mail  
 server.sendmail("sendermail@gmail.com", "receivermail@gmail.com", msg.as_string())  
 server.quit()  

You have to change this lines according where your HDD is mounted and name of it:

 HDD = os.statvfs ("/media/SERVICE")      # in my case is mounted to media and name is SERVICE  
 HDD = (HDD.f_frsize * HDD.f_bfree)/GB  

Check where is maunted and what's the name of HHD with this command:

 df -h   

You will see it of the bottom of output. When you are ready with edited code test it with this command: cd /path/to/script sudo python nameofscript.py and wait to receive mail :) If everything is OK add script to crontab:

 su - #to become a root  
 crontab – e # to edit cron jobs  

and add this line:

 */*10* * * * python /path/to/yourscript/temp_usbHDD_status.py 2>&1   
 # with this you will receive mail every day at 10 am.  

To save it -> CTRL+O-> Enter To exit -> CTRL+X Final result: That's it! You are done!
Source

You can buy sensors from HERE