Anbei ein Python Programm, um einen 1-Wire Sensor zu lesen und
bei Überschreitung der Alarmgrenzen eine Mail zu versenden.

Das script kann man über cronjob regelmäßig starten.

Bei Sender- und Empfänger-adressen ist folgendes zu beachten:

–          Die Mail-Adressen müssen ein gültiges Format ausweisen: name@domain.de

–          Weder Sender- noch Empfänger-Adresse müssen existieren

–          ABER …. Wenn ein Adresse verwendet, die auf dem verwendeten Mail-Server liegt, MUSS die existieren
Es geht:               Mail-Server = smtp.web.de   & Empfänger/Sender diegibtesnicht@gmx.de  | denauchnicht@gmx.de
Geht nicht          Mail-Server = smtp.gmx.de   & Empfänger/Sender diegibtesnicht@gmx.de  | denauchnicht@gmx.de

Edit: Die neue Version gibt eine bessere Fehlermeldung aus.

[codesyntax lang=”python”]

#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# read 1-wire sensor
# in case of value exceeding alarm limit
# send email via smtp
# 2013-06-06 V0.2 by Thomas Hoeser
#

import sys
import smtplib

from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

mail_server   = 'smtp.web.de'            # Mail Server
mail_account  = 'xxx.yyy@web.de'    # name of mail account
mail_password = 'secretpassword'            # password
addr_sender   = 'bill.gates@microsoft.de'    # sender email
addr_receiver = 'bill.gates@microsoft.de'    # receiver email

verbose_level = 2
debug_level   = 0
error_temp = -999

# dictionary with for 1-wire sensors: [sensor name] [1-Wire device]
sensor_dict = {    "Wohnzimmer": "28-00000487bb70",
                "Balkon"    : "28-00000487bb70",
                "Speicher"  : "28-000004be39a5"
                }

#---------------------------------------------------------------------------------------------
def read_sensor(Sensor):

    if verbose_level > 2:  
        print "1++++ read_sensor()"    
        print "sensor:" , Sensor
    if debug_level == 0:
        # get 1-Wire id from dictionary
        sensor_slave = str(sensor_dict.get(Sensor))
        # Open 1-wire slave file
        sensor_device = '/sys/bus/w1/devices/' + str(sensor_slave) + '/w1_slave'
        if verbose_level > 2:  
            print "open: ", sensor_device
        try:
            file = open(sensor_device)
            filecontent = file.read()                         # Read content from 1-wire slave file
            file.close()                                           # Close 1-wire slave file
            stringvalue = filecontent.split("\n")[1].split(" ")[9] # Extract temperature string
            if stringvalue[0].find("YES") > 0:
               temp = error_temp
            else:
               temp = float(stringvalue[2:]) / 1000            # Convert temperature value
            # temp=str(temp)
        except IOError:
            print "PANIC read_sensor - Cannot find file >" + sensor_slave + "< in /sys/bus/w1/devices/"
            print "No sensor attached"
            print "check with > cat /sys/devices/w1_bus_master1/w1_master_slaves"
            temp=("Sensor not attached")
    else:
        # this is dummy function generating a random number
        # ony used for testing purposes
        temp = random.randrange(-10, 30, 2) + 0.3
        # temp = Sensor + " " + str(temp)

    return(temp) # exit function read_sensor

# --------------------------------------------------------------------------------
def send_mail(title,message):

	debug_level = 0 # set to 1 to get more messages
	# Create message container - the correct MIME type is multipart/alternative.
	msg = MIMEMultipart('alternative')
	msg['Subject'] = title
	msg['From'] = addr_sender
	msg['To'] = addr_receiver

	# Create the body of the message (a plain-text and an HTML version).
	text = message

	html = """\
"""

	html += message
	html += """\

This is a service provided by raspberry

"""
	# print html

	# Record the MIME types of both parts - text/plain and text/html.
	part1 = MIMEText(text, 'plain')
	part2 = MIMEText(html, 'html')

	# Attach parts into message container.
	msg.attach(part1)
	msg.attach(part2)

	#mailsrv = smtplib.SMTP(mail_server)
	#mailsrv.login(mail_account,mail_password)
	#mailsrv.sendmail(addr_sender, addr_receiver, msg.as_string())
	#mailsrv.quit()
	#return()

	try:
		if debug_level > 0: print "smtplib.SMTP:", mail_server
		mailsrv = smtplib.SMTP(mail_server) # Send the message via local SMTP server.
	except:
		print "Error: unable to send email - smtp server"
		print "Server on ", mail_server, " cannot be reached or service is down"
		return()

	try:
		if debug_level > 0: print "mailsrv.login:", mail_account,  mail_password
		mailsrv.login(mail_account,mail_password)
	except:
		print "Error: unable to send email - login failed"
		print "login is not valid - check name and password:",mail_account,mail_password
		return()

	try:
		# sendmail function takes 3 arguments: sender's address, recipient's address and message to send - here it is sent as one string.
		if debug_level > 0: print "mailsrv.sendmail:", addr_sender,  addr_receiver
		mailsrv.sendmail(addr_sender, addr_receiver, msg.as_string())
		mailsrv.quit()
		print "Successfully sent email"
	except:
		print "Error: unable to send email - wrong address"
		print "mail address for sender or receiver invalid:",addr_sender,addr_receiver

#---------------------------------------------------------------------------------------------    
if __name__ == "__main__":

   alarm_hi = 20.5        # upper alarm level
   alarm_lo = -10.5       # lowe alarm level

   cur_temp = read_sensor("Speicher")
   print cur_temp, alarm_hi, alarm_lo

   if cur_temp == error_temp:
      print "read error - CRC = NO"
   else:
      if (cur_temp > alarm_hi) or (cur_temp < alarm_lo):
         subject = "Alarm"
         message = "Die Temperatur betraegt: " + str(cur_temp)
         print subject, message
         send_mail(subject,message)
      else:
         print "o.k."

   sys.exit(0)

[/codesyntax]