example.temperatureLogging.py

#!/usr/bin/env python
# -*- encoding: UTF8 -*-

# Author: Philipp Klaus, philipp.l.klaus AT web.de


#   This file is part of avrnetio.
#
#   avrnetio is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   avrnetio is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with avrnetio.  If not, see <http://www.gnu.org/licenses/>.



# example how to use the avrnetio class

## import the avrnetio class:
import avrnetio
## for debugging (set debug mark with pdb.set_trace() )
import pdb
## for sys.exit(1)
import sys
##for OptionParser() (see <http://optik.sourceforge.net/>)
from optparse import OptionParser
## for time.sleep()
import time
## for datetime.now()
from datetime import datetime
## for ntc
import electronics

host = "192.168.102.3"
defaultFilename = "./logged_temperature.txt"
refVoltage = 4.36
ntpADCport = 4

def main():
    
    
    parser = OptionParser()
    parser.add_option("-f", "--file",
                    action="store", type="string", dest="filename",
                    help="write data to FILE", metavar="FILE")
    parser.add_option("-q", "--quiet",
                    action="store_false", dest="verbose", default=1,
                    help="don't print status messages to stdout")
    
    (options, args) = parser.parse_args()
    
    if options.filename == None:
        options.filename = defaultFilename
        print "Logging to " + defaultFilename + " as no filenmame was supplied on the command line."
    
    print "Writing to file: %s" % options.filename
    logfile = open(options.filename, 'w')
    logfile.write("Starting new logfile"+"\n")
    
    try:
        try:
            netio = avrnetio.Avrnetio(host)
            netio.set_ref_ep(refVoltage)
        except StandardError as e:
            print("could not connect" + e.value)
            raise KeyboardInterrupt()
        temperature = electronics.Ntc(4700.0,25.0+273,9000.0)
        temperature.Uvcc = refVoltage
        i=0
        numberErrors=0
        while 1:
            try:
                ntc_voltage = netio.get_adcs_as_volts()[ntpADCport]
            except NameError, message:
                print(message)
                numberErrors+=1
                #raise KeyboardInterrupt()
            except StandardError, message:
                print(message)
                numberErrors+=1
                #print("AVR-NET-IO not available anymore. EXITING.")
                #raise KeyboardInterrupt()
            if numberErrors==10:
                raise KeyboardInterrupt()
            if numberErrors>0:
                continue
            numberErrors=0
            
            logfile.write("%s: %.1f °C" % ( datetime.now() , temperature.ntc_potential_to_temp(ntc_voltage)-273))
            logfile.write("\n")
            time.sleep(1)
            if i%60==0 :
                logfile.flush()
            i+=1
    
    except KeyboardInterrupt:
        print "[Ctrl]-[C] pressed: closing logfile."
        netio = None
        logfile.close()


if __name__ == '__main__':
    main()