chrowe · April 6, 2015 04:08 · chrowe · Apr 6, 2015
diff --git a/monitor.py b/monitor.py
 #!/usr/bin/env python

 import sqlite3

 import os
 import time
 import glob

 # global variables
 speriod=(15*60)-1
 dbname='/var/www/templog.db'



 # store the temperature in the database
 def log_temperature(temp):

    conn=sqlite3.connect(dbname)
    curs=conn.cursor()

    curs.execute("INSERT INTO temps values(datetime('now', 'localtime'), (?))", (temp,))

    # commit the changes
    conn.commit()

    conn.close()


 # display the contents of the database
 def display_data():

    conn=sqlite3.connect(dbname)
    curs=conn.cursor()

    for row in curs.execute("SELECT * FROM temps"):
        print str(row[0])+"	"+str(row[1])

    conn.close()



 # get temerature
 # returns None on error, or the temperature as a float
 def get_temp(devicefile):

    try:
        fileobj = open(devicefile,'r')
        lines = fileobj.readlines()
        fileobj.close()
    except:
        return None

    # get the status from the end of line 1
    status = lines[0][-4:-1]

    # is the status is ok, get the temperature from line 2
    if status=="YES":
        print status
        tempstr= lines[1][-6:-1]
        tempvalue=float(tempstr)/1000 * 1.8 + 32
        print tempvalue
        return tempvalue
    else:
        print "There was an error."
        return None



 # main function
 # This is where the program starts
 def main():

    # enable kernel modules
    os.system('sudo modprobe w1-gpio')
    os.system('sudo modprobe w1-therm')

    # search for a device file that starts with 28
    devicelist = glob.glob('/sys/bus/w1/devices/28*')
    if devicelist=='':
        return None
    else:
        # append /w1slave to the device file
        w1devicefile = devicelist[0] + '/w1_slave'


 #    while True:

    # get the temperature from the device file
    temperature = get_temp(w1devicefile)
    if temperature != None:
        print "temperature="+str(temperature)
    else:
        # Sometimes reads fail on the first attempt
        # so we need to retry
        temperature = get_temp(w1devicefile)
        print "temperature="+str(temperature)

        # Store the temperature in the database
    log_temperature(temperature)

        # display the contents of the database
 #        display_data()

 #        time.sleep(speriod)


 if __name__=="__main__":
    main()



diff --git a/webgui.py b/webgui.py
 #!/usr/bin/env python

 import sqlite3
 import sys
 import cgi
 import cgitb


 # global variables
 speriod=(15*60)-1
 dbname='/var/www/templog.db'



 # print the HTTP header
 def printHTTPheader():
    print "Content-type: text/html\n\n"



 # print the HTML head section
 # arguments are the page title and the table for the chart
 def printHTMLHead(title, table):
    print "<head>"
    print "    <title>"
    print title
    print "    </title>"

    print_graph_script(table)

    print "</head>"


 # get data from the database
 # if an interval is passed,
 # return a list of records from the database
 def get_data(interval):

    conn=sqlite3.connect(dbname)
    curs=conn.cursor()

    if interval == None:
        curs.execute("SELECT * FROM temps")
    else:
        curs.execute("SELECT * FROM temps WHERE timestamp>datetime('now','-%s hours')" % interval)
 #        curs.execute("SELECT * FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hours') AND timestamp<=datetime('2013-09-19 21:31:02')" % interval)

    rows=curs.fetchall()

    conn.close()

    return rows


 # convert rows from database into a javascript table
 def create_table(rows):
    chart_table=""

    for row in rows[:-1]:
        rowstr="['{0}', {1}],\n".format(str(row[0]),str(row[1]))
        chart_table+=rowstr

    row=rows[-1]
    rowstr="['{0}', {1}]\n".format(str(row[0]),str(row[1]))
    chart_table+=rowstr

    return chart_table


 # print the javascript to generate the chart
 # pass the table generated from the database info
 def print_graph_script(table):

    # google chart snippet
    chart_code="""
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Time', 'Temperature'],
 %s
        ]);

        var options = {
          title: 'Temperature'
        };

        var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>"""

    print chart_code % (table)




 # print the div that contains the graph
 def show_graph():
    print "<h2>Temperature Chart</h2>"
    print '<div id="chart_div" style="width: 900px; height: 500px;"></div>'



 # connect to the db and show some stats
 # argument option is the number of hours
 def show_stats(option):

    conn=sqlite3.connect(dbname)
    curs=conn.cursor()

    if option is None:
        option = str(24)

    curs.execute("SELECT timestamp,max(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
 #    curs.execute("SELECT timestamp,max(temp) FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hour') AND timestamp<=datetime('2013-09-19 21:31:02')" % option)
    rowmax=curs.fetchone()
    rowstrmax="{0}&nbsp&nbsp&nbsp{1}F".format(str(rowmax[0]),str(rowmax[1]))

    curs.execute("SELECT timestamp,min(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
 #    curs.execute("SELECT timestamp,min(temp) FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hour') AND timestamp<=datetime('2013-09-19 21:31:02')" % option)
    rowmin=curs.fetchone()
    rowstrmin="{0}&nbsp&nbsp&nbsp{1}F".format(str(rowmin[0]),str(rowmin[1]))

    curs.execute("SELECT avg(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
 #    curs.execute("SELECT avg(temp) FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hour') AND timestamp<=datetime('2013-09-19 21:31:02')" % option)
    rowavg=curs.fetchone()


    print "<hr>"


    print "<h2>Minumum temperature&nbsp</h2>"
    print rowstrmin
    print "<h2>Maximum temperature</h2>"
    print rowstrmax
    print "<h2>Average temperature</h2>"
    print "%.3f" % rowavg+"F"

    print "<hr>"

    print "<h2>In the last hour:</h2>"
    print "<table>"
    print "<tr><td><strong>Date/Time</strong></td><td><strong>Temperature</strong></td></tr>"

    rows=curs.execute("SELECT * FROM temps WHERE timestamp>datetime('new','-1 hour') AND timestamp<=datetime('new')")
 #    rows=curs.execute("SELECT * FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-1 hour') AND timestamp<=datetime('2013-09-19 21:31:02')")
    for row in rows:
        rowstr="<tr><td>{0}&emsp;&emsp;</td><td>{1}C</td></tr>".format(str(row[0]),str(row[1]))
        print rowstr
    print "</table>"

    print "<hr>"

    conn.close()




 def print_time_selector(option):

    print """<form action="/cgi-bin/webgui.py" method="POST">
        Show the temperature logs for
        <select name="timeinterval">"""


    if option is not None:

        if option == "6":
            print "<option value=\"6\" selected=\"selected\">the last 6 hours</option>"
        else:
            print "<option value=\"6\">the last 6 hours</option>"

        if option == "12":
            print "<option value=\"12\" selected=\"selected\">the last 12 hours</option>"
        else:
            print "<option value=\"12\">the last 12 hours</option>"

        if option == "24":
            print "<option value=\"24\" selected=\"selected\">the last 24 hours</option>"
        else:
            print "<option value=\"24\">the last 24 hours</option>"

    else:
        print """<option value="6">the last 6 hours</option>
            <option value="12">the last 12 hours</option>
            <option value="24" selected="selected">the last 24 hours</option>"""

    print """        </select>
        <input type="submit" value="Display">
    </form>"""


 # check that the option is valid
 # and not an SQL injection
 def validate_input(option_str):
    # check that the option string represents a number
    if option_str.isalnum():
        # check that the option is within a specific range
        if int(option_str) > 0 and int(option_str) <= 24:
            return option_str
        else:
            return None
    else:
        return None


 #return the option passed to the script
 def get_option():
    form=cgi.FieldStorage()
    if "timeinterval" in form:
        option = form["timeinterval"].value
        return validate_input (option)
    else:
        return None




 # main function
 # This is where the program starts
 def main():

    cgitb.enable()

    # get options that may have been passed to this script
    option=get_option()

    if option is None:
        option = str(24)

    # get data from the database
    records=get_data(option)

    # print the HTTP header
    printHTTPheader()

    if len(records) != 0:
        # convert the data into a table
        table=create_table(records)
    else:
        print "No data found"
        return

    # start printing the page
    print "<html>"
    # print the head section including the table
    # used by the javascript for the chart
    printHTMLHead("Raspberry Pi Temperature Logger", table)

    # print the page body
    print "<body>"
    print "<h1>Raspberry Pi Temperature Logger</h1>"
    print "<hr>"
    print_time_selector(option)
    show_graph()
    show_stats(option)
    print "</body>"
    print "</html>"

    sys.stdout.flush()

 if __name__=="__main__":
    main()
	#!/usr/bin/env python

	import sqlite3

	import os
	import time
	import glob

	# global variables
	speriod=(15*60)-1
	dbname='/var/www/templog.db'



	# store the temperature in the database
	def log_temperature(temp):

	conn=sqlite3.connect(dbname)
	curs=conn.cursor()

	curs.execute("INSERT INTO temps values(datetime('now', 'localtime'), (?))", (temp,))

	# commit the changes
	conn.commit()

	conn.close()


	# display the contents of the database
	def display_data():

	conn=sqlite3.connect(dbname)
	curs=conn.cursor()

	for row in curs.execute("SELECT * FROM temps"):
	print str(row[0])+" "+str(row[1])

	conn.close()



	# get temerature
	# returns None on error, or the temperature as a float
	def get_temp(devicefile):

	try:
	fileobj = open(devicefile,'r')
	lines = fileobj.readlines()
	fileobj.close()
	except:
	return None

	# get the status from the end of line 1
	status = lines[0][-4:-1]

	# is the status is ok, get the temperature from line 2
	if status=="YES":
	print status
	tempstr= lines[1][-6:-1]
	tempvalue=float(tempstr)/1000 * 1.8 + 32
	print tempvalue
	return tempvalue
	else:
	print "There was an error."
	return None



	# main function
	# This is where the program starts
	def main():

	# enable kernel modules
	os.system('sudo modprobe w1-gpio')
	os.system('sudo modprobe w1-therm')

	# search for a device file that starts with 28
	devicelist = glob.glob('/sys/bus/w1/devices/28*')
	if devicelist=='':
	return None
	else:
	# append /w1slave to the device file
	w1devicefile = devicelist[0] + '/w1_slave'


	# while True:

	# get the temperature from the device file
	temperature = get_temp(w1devicefile)
	if temperature != None:
	print "temperature="+str(temperature)
	else:
	# Sometimes reads fail on the first attempt
	# so we need to retry
	temperature = get_temp(w1devicefile)
	print "temperature="+str(temperature)

	# Store the temperature in the database
	log_temperature(temperature)

	# display the contents of the database
	# display_data()

	# time.sleep(speriod)


	if __name__=="__main__":
	main()
	#!/usr/bin/env python

	import sqlite3
	import sys
	import cgi
	import cgitb


	# global variables
	speriod=(15*60)-1
	dbname='/var/www/templog.db'



	# print the HTTP header
	def printHTTPheader():
	print "Content-type: text/html\n\n"



	# print the HTML head section
	# arguments are the page title and the table for the chart
	def printHTMLHead(title, table):
	print "<head>"
	print " <title>"
	print title
	print " </title>"

	print_graph_script(table)

	print "</head>"


	# get data from the database
	# if an interval is passed,
	# return a list of records from the database
	def get_data(interval):

	conn=sqlite3.connect(dbname)
	curs=conn.cursor()

	if interval == None:
	curs.execute("SELECT * FROM temps")
	else:
	curs.execute("SELECT * FROM temps WHERE timestamp>datetime('now','-%s hours')" % interval)
	# curs.execute("SELECT * FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hours') AND timestamp<=datetime('2013-09-19 21:31:02')" % interval)

	rows=curs.fetchall()

	conn.close()

	return rows


	# convert rows from database into a javascript table
	def create_table(rows):
	chart_table=""

	for row in rows[:-1]:
	rowstr="['{0}', {1}],\n".format(str(row[0]),str(row[1]))
	chart_table+=rowstr

	row=rows[-1]
	rowstr="['{0}', {1}]\n".format(str(row[0]),str(row[1]))
	chart_table+=rowstr

	return chart_table


	# print the javascript to generate the chart
	# pass the table generated from the database info
	def print_graph_script(table):

	# google chart snippet
	chart_code="""
	<script type="text/javascript" src="https://www.google.com/jsapi"></script>
	<script type="text/javascript">
	google.load("visualization", "1", {packages:["corechart"]});
	google.setOnLoadCallback(drawChart);
	function drawChart() {
	var data = google.visualization.arrayToDataTable([
	['Time', 'Temperature'],
	%s
	]);

	var options = {
	title: 'Temperature'
	};

	var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
	chart.draw(data, options);
	}
	</script>"""

	print chart_code % (table)




	# print the div that contains the graph
	def show_graph():
	print "<h2>Temperature Chart</h2>"
	print '<div id="chart_div" style="width: 900px; height: 500px;"></div>'



	# connect to the db and show some stats
	# argument option is the number of hours
	def show_stats(option):

	conn=sqlite3.connect(dbname)
	curs=conn.cursor()

	if option is None:
	option = str(24)

	curs.execute("SELECT timestamp,max(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
	# curs.execute("SELECT timestamp,max(temp) FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hour') AND timestamp<=datetime('2013-09-19 21:31:02')" % option)
	rowmax=curs.fetchone()
	rowstrmax="{0}&nbsp&nbsp&nbsp{1}F".format(str(rowmax[0]),str(rowmax[1]))

	curs.execute("SELECT timestamp,min(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
	# curs.execute("SELECT timestamp,min(temp) FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hour') AND timestamp<=datetime('2013-09-19 21:31:02')" % option)
	rowmin=curs.fetchone()
	rowstrmin="{0}&nbsp&nbsp&nbsp{1}F".format(str(rowmin[0]),str(rowmin[1]))

	curs.execute("SELECT avg(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
	# curs.execute("SELECT avg(temp) FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-%s hour') AND timestamp<=datetime('2013-09-19 21:31:02')" % option)
	rowavg=curs.fetchone()


	print "<hr>"


	print "<h2>Minumum temperature&nbsp</h2>"
	print rowstrmin
	print "<h2>Maximum temperature</h2>"
	print rowstrmax
	print "<h2>Average temperature</h2>"
	print "%.3f" % rowavg+"F"

	print "<hr>"

	print "<h2>In the last hour:</h2>"
	print "<table>"
	print "<tr><td><strong>Date/Time</strong></td><td><strong>Temperature</strong></td></tr>"

	rows=curs.execute("SELECT * FROM temps WHERE timestamp>datetime('new','-1 hour') AND timestamp<=datetime('new')")
	# rows=curs.execute("SELECT * FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-1 hour') AND timestamp<=datetime('2013-09-19 21:31:02')")
	for row in rows:
	rowstr="<tr><td>{0}&emsp;&emsp;</td><td>{1}C</td></tr>".format(str(row[0]),str(row[1]))
	print rowstr
	print "</table>"

	print "<hr>"

	conn.close()




	def print_time_selector(option):

	print """<form action="/cgi-bin/webgui.py" method="POST">
	Show the temperature logs for
	<select name="timeinterval">"""


	if option is not None:

	if option == "6":
	print "<option value=\"6\" selected=\"selected\">the last 6 hours</option>"
	else:
	print "<option value=\"6\">the last 6 hours</option>"

	if option == "12":
	print "<option value=\"12\" selected=\"selected\">the last 12 hours</option>"
	else:
	print "<option value=\"12\">the last 12 hours</option>"

	if option == "24":
	print "<option value=\"24\" selected=\"selected\">the last 24 hours</option>"
	else:
	print "<option value=\"24\">the last 24 hours</option>"

	else:
	print """<option value="6">the last 6 hours</option>
	<option value="12">the last 12 hours</option>
	<option value="24" selected="selected">the last 24 hours</option>"""

	print """ </select>
	<input type="submit" value="Display">
	</form>"""


	# check that the option is valid
	# and not an SQL injection
	def validate_input(option_str):
	# check that the option string represents a number
	if option_str.isalnum():
	# check that the option is within a specific range
	if int(option_str) > 0 and int(option_str) <= 24:
	return option_str
	else:
	return None
	else:
	return None


	#return the option passed to the script
	def get_option():
	form=cgi.FieldStorage()
	if "timeinterval" in form:
	option = form["timeinterval"].value
	return validate_input (option)
	else:
	return None




	# main function
	# This is where the program starts
	def main():

	cgitb.enable()

	# get options that may have been passed to this script
	option=get_option()

	if option is None:
	option = str(24)

	# get data from the database
	records=get_data(option)

	# print the HTTP header
	printHTTPheader()

	if len(records) != 0:
	# convert the data into a table
	table=create_table(records)
	else:
	print "No data found"
	return

	# start printing the page
	print "<html>"
	# print the head section including the table
	# used by the javascript for the chart
	printHTMLHead("Raspberry Pi Temperature Logger", table)

	# print the page body
	print "<body>"
	print "<h1>Raspberry Pi Temperature Logger</h1>"
	print "<hr>"
	print_time_selector(option)
	show_graph()
	show_stats(option)
	print "</body>"
	print "</html>"

	sys.stdout.flush()

	if __name__=="__main__":
	main()