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# rpi-temp-humid-monitor
Raspberry Pi temperature humidity monitor
This is my implementation of making a Raspberry Pi powered temperature and humidity monitor. The original instructions that I followed were created by wpnsmith at [the instructables website](http://www.instructables.com/id/Raspberry-Pi-Temperature-Humidity-Network-Monitor/)
In this repository are my copies of the th.c code, a thd init script, and two files for creating a Google Chart graph rather than the python based GraphTH.py using matplotlib that wpnsmith used.
The th.c code was modified so that a fourth column in MySQL is used (an auto incrementing id - probably not strictly necessary as the ComputerTime entry is incrementing anyway), as well as having th detect if an incorrect temperature/humidity reading has been made (by checking against the previously recorded value) and silently not adding this to the MySQL database if it is seen to be a big change.
Using a thd init script means that we don't need to modify /etc/rc.local - which is useful for me as this file is used by other projects and can be overwritten at times.
## UPDATED - 10 July 2015
Added a python script, readMysql.py, to read the previous values of temperature and humidity from the MySQL database. This is necessary for the single run python script, as we don't have a previous reading to compare against.
## UPDATED - 24 June 2015
Fixed a typo in a variable name (humiddiff) that could cause the daemon to crash if an erroneous reading was made.
## UPDATED - 23 June 2015
Fixed a bug in the code where the script would crash as I hadn't passed the temperature and humidity difference tolerances allowed to the loop. If an erroneous reading was made, the script would crash.
## UPDATED - 19 June 2015
The updateMysql.py script has been updated to provide a method of retrying failed MySQL updates. Primarily this was added so that when the server is booted up, the daemon version of the code can retry a number of times before giving up, as the MySQL server will not necessarily have finished starting up.
An updated thMonitord init script has been added, and the temp-humid-read-loop and temp-humid-read-single scripts have been altered so that they are currently hardcoded to use a configuration file called /etc/thMonitor.conf
## UPDATED - 18 June 2015
There are now two python scripts (with logging added rather than printing to stdout)
- temp-humid-read-loop.py - this code should loop and run the temperature/humidity readind every 60 seconds. I have tried to add code to ensure that this loops every 60 seconds regardless of how long the actual reading takes. Due to occasional reading errors, the function to read temperature and humidity can vary in length - dependent upon the timeout and number of retries conifgured. The code should time the length of the sensorRead function and subtract this time from the configured reading interval. Tests have shown this is reasonably accurate but some drift has still been observed.
- temp-humid-python-single.py - this code is a simplified python script taken from the looping script. The looping logic has been removed, and a single pass is made reading the temperature and humidity readings. Any errors from a reading during this single pass are retried according to the timeout and retries configured though - so a single read should succeed. This script can be put into a cron job to run on a regularly scheduled basis, which might be less prone to drift than the looped version.
- updateMysql.py - this code has been cleaned up so that it logs to the logfile rather than to stdout by default.
## UPDATED - 17 June 2015
Looking to replace the C code with a python script that takes a configuration file. Added here:
- temp-humid-read-loop.py - python code to continuously loop and read the temperature and humidity settings
- updateMysql.py - python code called by the loop script to update the MySQL database
- temphumid.conf - sample configuration file to be used with the python script
- dhtreader.so - binary shared object file. This has been created from [http://www.airspayce.com/mikem/bcm2835/](http://www.airspayce.com/mikem/bcm2835/)
###Please note this updated python code was heavily inspired by the work done by Adafruit here:###
[https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/tree/master/Adafruit_DHT_Driver_Python](https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/tree/master/Adafruit_DHT_Driver_Python)
Raspberry Pi temperature and humidity monitoring code

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## TO DO LIST
- Update the single run python script so that it reads the MySQL database for the previous values of temperature and humidity, as it doesn't loop and therefore doesn't maintain the previous readings.

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#
# Makefile:
# wiringPi - Wiring Compatable library for the Raspberry Pi
# https://projects.drogon.net/wiring-pi
#
# Copyright (c) 2012 Gordon Henderson
#################################################################################
# This file is part of wiringPi:
# Wiring Compatable library for the Raspberry Pi
#
# wiringPi is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# wiringPi 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
#################################################################################
#DEBUG = -g -O0
DEBUG = -O3
CC = gcc
INCLUDE = -I/usr/local/include,/usr/include/mysql
CFLAGS = $(DEBUG) -Wall $(INCLUDE) -Winline -pipe -std=c99
LDFLAGS = -L/usr/local/lib,/usr/lib/arm-linux-gnueabihf -lmysqlclient -lpthread -lz -lm -lrt -ldl -lconfig
LDLIBS = -lwiringPi -lwiringPiDev -lpthread -lm
# Should not alter anything below this line
###############################################################################
SRC = blink.c blink8.c blink12.c \
blink12drcs.c \
pwm.c \
speed.c wfi.c isr.c isr-osc.c \
lcd.c lcd-adafruit.c clock.c \
nes.c \
softPwm.c softTone.c \
delayTest.c serialRead.c serialTest.c okLed.c ds1302.c \
lowPower.c \
rht03.c piglow.c
OBJ = $(SRC:.c=.o)
BINS = $(SRC:.c=)
all:
@cat README.TXT
@echo " $(BINS)" | fmt
@echo ""
really-all: $(BINS)
blink: blink.o
@echo [link]
@$(CC) -o $@ blink.o $(LDFLAGS) $(LDLIBS)
blink8: blink8.o
@echo [link]
@$(CC) -o $@ blink8.o $(LDFLAGS) $(LDLIBS)
blink12drcs: blink12drcs.o
@echo [link]
@$(CC) -o $@ blink12drcs.o $(LDFLAGS) $(LDLIBS)
blink12: blink12.o
@echo [link]
@$(CC) -o $@ blink12.o $(LDFLAGS) $(LDLIBS)
speed: speed.o
@echo [link]
@$(CC) -o $@ speed.o $(LDFLAGS) $(LDLIBS)
lcd: lcd.o
@echo [link]
@$(CC) -o $@ lcd.o $(LDFLAGS) $(LDLIBS)
lcd-adafruit: lcd-adafruit.o
@echo [link]
@$(CC) -o $@ lcd-adafruit.o $(LDFLAGS) $(LDLIBS)
clock: clock.o
@echo [link]
@$(CC) -o $@ clock.o $(LDFLAGS) $(LDLIBS)
wfi: wfi.o
@echo [link]
@$(CC) -o $@ wfi.o $(LDFLAGS) $(LDLIBS)
isr: isr.o
@echo [link]
@$(CC) -o $@ isr.o $(LDFLAGS) $(LDLIBS)
isr-osc: isr-osc.o
@echo [link]
@$(CC) -o $@ isr-osc.o $(LDFLAGS) $(LDLIBS)
nes: nes.o
@echo [link]
@$(CC) -o $@ nes.o $(LDFLAGS) $(LDLIBS)
rht03: rht03.o
@echo [link]
@$(CC) -o $@ rht03.o $(LDFLAGS) $(LDLIBS)
pwm: pwm.o
@echo [link]
@$(CC) -o $@ pwm.o $(LDFLAGS) $(LDLIBS)
softPwm: softPwm.o
@echo [link]
@$(CC) -o $@ softPwm.o $(LDFLAGS) $(LDLIBS)
softTone: softTone.o
@echo [link]
@$(CC) -o $@ softTone.o $(LDFLAGS) $(LDLIBS)
delayTest: delayTest.o
@echo [link]
@$(CC) -o $@ delayTest.o $(LDFLAGS) $(LDLIBS)
serialRead: serialRead.o
@echo [link]
@$(CC) -o $@ serialRead.o $(LDFLAGS) $(LDLIBS)
serialTest: serialTest.o
@echo [link]
@$(CC) -o $@ serialTest.o $(LDFLAGS) $(LDLIBS)
okLed: okLed.o
@echo [link]
@$(CC) -o $@ okLed.o $(LDFLAGS) $(LDLIBS)
tone: tone.o
@echo [link]
@$(CC) -o $@ tone.o $(LDFLAGS) $(LDLIBS)
ds1302: ds1302.o
@echo [link]
@$(CC) -o $@ ds1302.o $(LDFLAGS) $(LDLIBS)
piglow: piglow.o
@echo [link]
@$(CC) -o $@ piglow.o $(LDFLAGS) $(LDLIBS)
.c.o:
@echo [CC] $<
@$(CC) -c $(CFLAGS) $< -o $@
clean:
@echo "[Clean]"
@rm -f $(OBJ) *~ core tags $(BINS)
tags: $(SRC)
@echo [ctags]
@ctags $(SRC)
depend:
makedepend -Y $(SRC)
# DO NOT DELETE

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c_code/th.c Normal file
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/*
* th.c capture Temperature and Humidity readings, write them to sql database
* https://projects.drogon.net/raspberry-pi/wiringpi/
rev 1.0 12/01/2013 WPNS built from Gordon Hendersen's rht03.c
rev 1.1 12/01/2013 WPNS don't retry, takes too long
rev 1.2 12/01/2013 WPNS allow one retry after 3-second delay
rev 1.3 12/01/2013 WPNS make cycle time variable
rev 1.4 12/01/2013 WPNS add mysql stuff in
rev 1.5 12/01/2013 WPNS do 60 second cycle, cleanup, trial run
rev 1.6 12/01/2013 WPNS clean up output format
rev 1.7 12/02/2013 WPNS allow more retries, minor cleanups
rev 1.79 12/04/2013 WPNS release to instructables
rev 1.8 01/06/2015 JDE updated code to try and drop anomolous temperature humidity readings before hitting the database
rev 1.9 04/06/2015 JDE updated to try and read MySQL configuration from /etc/th.conf file rather than hard coding it
rev 1.10 11/06/2015 JDE updated to remove echoing the config options to the th.log file
*/
#include <stdio.h>
#include <wiringPi.h>
#include <maxdetect.h>
#include <time.h>
#include <libconfig.h>
#include <mysql/mysql.h>
#define RHT03_PIN 7
#define CYCLETIME 60
#define RETRIES 3
void finish_with_error(MYSQL *con)
{
fprintf(stderr, "%s\n", mysql_error(con));
mysql_close(con);
exit(1);
}
int main()
{
config_t cfg; /*Returns all parameters in this structure */
config_setting_t *setting;
const char *str1, *sqlServer, *databaseName, *username, *password;
char *config_file_name = "/etc/th.conf";
int temp, rh, oldtemp, difftemp ; // temperature and relative humidity readings
int loop; // how many times through the loop?
time_t oldtime,newtime; // when did we last take a reading?
char SQLstring[64]; // string to send to SQL engine
char TimeString[64]; // formatted time
time_t rawtime;
struct tm * timeinfo;
int status; // how did the read go?
/*Initialization */
config_init(&cfg);
/* Read the file. If there is an error, report it and exit. */
if (!config_read_file(&cfg, config_file_name))
{
printf("\n%s:%d - %s", config_error_file(&cfg), config_error_line(&cfg), config_error_text(&cfg));
config_destroy(&cfg);
return -1;
}
/* Get the configuration file name. */
if (config_lookup_string(&cfg, "filename", &str1))
printf("\nFile Type: %s", str1);
else
printf("\nNo 'filename' setting in configuration file.");
/*Read the parameter group*/
setting = config_lookup(&cfg, "params");
if (setting != NULL)
{
/*Read the server*/
if (config_setting_lookup_string(setting, "sqlServer", &sqlServer));
else
printf("\nERROR: No 'sqlServer' setting in configuration file.");
/*Read the database*/
if (config_setting_lookup_string(setting, "databaseName", &databaseName));
else
printf("\nERROR: No 'databaseName' setting in configuration file.");
/*Read the username*/
if (config_setting_lookup_string(setting, "username", &username));
else
printf("\nERROR: No 'username' setting in configuration file.");
/*Read the password*/
if (config_setting_lookup_string(setting, "password", &password));
else
printf("\nERROR: No 'password' setting in configuration file.");
printf("\n");
}
/* config_destroy(&cfg); */
/*MYSQL *con = mysql_init(NULL);
if (con == NULL) finish_with_error(con);
if (mysql_real_connect(con, sqlServer, username, password, databaseName, 0, NULL, 0) == NULL) finish_with_error(con);
sprintf(SQLstring,"SELECT ComputerTime, Temperature, Humidity FROM TempHumid ORDER BY id DESC LIMIT 1");
if (mysql_query(con, SQLstring)) finish_with_error(con);
MYSQL_RES *result = mysql_store_result(con);
if (result == NULL)
{
finish_with_error(con);
}
int num_fields = mysql_num_fields(result);
MYSQL_ROW row;
row = mysql_fetch_row(result);
for(int i = 0; i < num_fields; i++)
{
printf("%s ", row[i] ? row[i] : "NULL");
}
printf("\n"); */
/* THIS IS WHERE THE Temperautre humidity monitoring Code starts - really untidy and needs tidying up */
temp = rh = loop = 0 ;
oldtime = (int)time(NULL);
wiringPiSetup () ;
piHiPri (55) ;
printf("th.c rev 1.10 11/06/2015 JDE %sCycle time: %i seconds, %i retries\n",ctime(&oldtime),CYCLETIME,RETRIES);
fflush(stdout);
MYSQL *con = mysql_init(NULL);
if (con == NULL) finish_with_error(con);
if (mysql_real_connect(con, sqlServer, username, password, databaseName, 0, NULL, 0) == NULL) finish_with_error(con);
// wait for an interval to start and end
printf("Sync to cycletime...");
fflush(stdout);
while ((((int)time(NULL))%CYCLETIME)) delay(100);
oldtime = (int)time(NULL);
oldtemp = 500;
while (!(((int)time(NULL))%CYCLETIME)) delay(100);
printf("\n");
fflush(stdout);
for (;;)
{
// wait for an interval to start
while ((((int)time(NULL))%CYCLETIME)) delay(100);
/*****************************************************************/
// read new data
temp = rh = -1;
loop=RETRIES;
status = readRHT03 (RHT03_PIN, &temp, &rh);
while ((!status) && loop--)
{
printf("-Retry-");
fflush(stdout);
delay(3000);
status = readRHT03 (RHT03_PIN, &temp, &rh);
}
newtime = (int)time(NULL);
// deltime = newtime-oldtime;
time(&rawtime);
timeinfo = localtime (&rawtime);
strftime (TimeString,64,"%F %T",timeinfo);
fflush(stdout);
oldtime = newtime;
difftemp = temp - oldtemp;
printf("Current Temp: %5.1f, Previous Temp: %5.1f, Temperature Difference: %5.1fC\n",(temp / 10.0),(oldtemp / 10.0),(difftemp / 10.0)) ;
if (temp > oldtemp && difftemp > 100) {
printf("Damn ... the sensor returned a bad reading!\n");
}
else {
sprintf(SQLstring,"INSERT INTO TempHumid VALUES(unix_timestamp(now()),%5.1f,%5.1f,NULL)",(temp / 10.0),(rh / 10.0));
if (mysql_query(con, SQLstring)) finish_with_error(con);
oldtemp = temp;
}
/*****************************************************************/
// wait for the rest of that interval to finish
while (!(((int)time(NULL))%CYCLETIME)) delay(100);
}
return 0 ;
config_destroy(&cfg);
}

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The stucture of th.c is horrible at the moment. Everything is called from main()
At some point I'd like to break out the reading of the configuration into a separate sub-routine. The printing of the configureation
file details into the log file should also be disabled for a live situation.
TODO:
1. Stop printing out config to the log file.
2. Add an option to specify the config file on the command line.
3. Add the option to log to the syslog facility.
4. Maybe add code here to only start up when MySQL is available, and to wait/retry until this works.

12
c_code/th.conf Normal file
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//config.txt
// Basic Information:
filename = "Temperature and Humidity Monitoring Configuration File";
// Parameters
params =
{
sqlServer = "localhost";
databaseName = "Monitoring";
username = "USERNAME";
password = "PASSWORD";
};

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c_code/thd Normal file
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#!/bin/sh
### BEGIN INIT INFO
# Provides: th
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 1
# Short-Description: Temperature and Humidity Monitoring Daemon
### END INIT INFO
set -e
DAEMON="/usr/sbin/th"
NAME="th"
PATH="/sbin:/bin:/usr/sbin:/usr/bin"
LOGFILE="/var/log/th.log"
test -x "${DAEMON}" || exit 0
if [ ! -e "${LOGFILE}" ]
then
touch "${LOGFILE}"
chmod 640 "${LOGFILE}"
chown root:adm "${LOGFILE}"
fi
case "${1}" in
start)
echo -n "Starting Temperature and Humidity Monitoring Daemon: "
sleep 10 # We need to wait until mysqld has started - this is a horrible workaround for now
start-stop-daemon --start --background -m --oknodo --pidfile /var/run/th.pid --startas /bin/bash -- -c "exec ${DAEMON} >> ${LOGFILE} 2>&1"
echo "${NAME}."
;;
stop)
echo -n "Stopping Temperature and Humidity Monitoring Daemon: "
start-stop-daemon --stop --pidfile /var/run/th.pid --oknodo --exec ${DAEMON}
rm -f /var/run/th.pid
echo "${NAME}."
;;
restart)
echo -n "Stopping Temperature and Humidity Monitoring Daemon: "
start-stop-daemon --stop --pidfile /var/run/th.pid --oknodo --exec ${DAEMON}
rm -f /var/run/th.pid
echo "${NAME}."
echo -n "Starting Temperature and Humidity Monitoring Daemon: "
start-stop-daemon --start --background -m --oknodo --pidfile /var/run/th.pid --startas /bin/bash -- -c "exec ${DAEMON} >> ${LOGFILE}"
echo "${NAME}."
;;
status)
PID="$(cat /var/run/th.pid 2>/dev/null)" || true
if [ ! -f /var/run/th.pid ] || [ -z "${PID}" ]
then
echo "${NAME} is not running"
exit 3
fi
if ps "${PID}" >/dev/null 2>&1
then
echo "${NAME} is running"
exit 0
else
echo "${NAME} is not running"
exit 1
fi
;;
*)
echo "Usage: /etc/init.d/${NAME} {start|stop|restart|status}"
exit 1
;;
esac
exit 0

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getData.php Normal file
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<?php
$servername = "localhost";
$username = "USERNAME";
$password = "PASSWORD";
$dbname = "Monitoring";
$rows = array();
$table = array();
$table['cols'] = array(
// Labels for your chart, these represent the column titles
array('label' => 'Date and Time', 'type' => 'number'),
array('label' => 'Temperature', 'type' => 'number'),
array('label' => 'Humidity', 'type' => 'number')
);
// Create connection
//$conn = new mysqli($servername, $username, $password, $dbname);
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT ComputerTime, Temperature, Humidity from TempHumid ORDER BY id DESC LIMIT 360";
$result = mysqli_query($conn,$sql);
//if ($result->num_rows > 0) {
// output data of each row
while($row = mysqli_fetch_array($result)) {
$temp = array();
// $datetime = date('d/m/Y H:i', $row[0]);
// $temp[] = array('v' => $datetime);
$temp[] = array('v' => $row[0]);
$temp[] = array('v' => $row[1]);
$temp[] = array('v' => $row[2]);
$rows[] = array('c' => $temp);
}
//} else {
// echo "No current temperature - ERROR?";
//}
$table['rows'] = $rows;
header('Content-type: application/json');
echo json_encode($table);
$conn->close();
?>

35
python_code/readMysql.py Normal file
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#!/usr/bin/python
##
## Script to read the last temperature and humidity readings from a MySQL database
##
import sys
import MySQLdb
def main(host, db, user, passwd, logging, sql_retries, sql_timeout):
logging.debug('Reading MySQL database next ...')
connection = MySQLdb.connect(host,user,passwd,db)
cursor=connection.cursor()
sql = """SELECT Temperature, Humidity FROM TempHumid ORDER BY ComputerTime DESC LIMIT 1"""
success = False
attempts = 0
while attempts < sql_retries and not success:
try:
cursor.execute(sql)
data = cursor.fetchall()
for row in data :
temp = row[0]
humid = row[1]
oldtemp = float(temp)
oldhumid = float(humid)
logging.debug('The MySQL database was successfully read.')
connection.commit()
cursor.close()
logging.debug('The previous temperature was: {0}C and the previous humidity was {1}%'.format(oldtemp, oldhumid))
success = True
except MySQLdb.Error, e:
logging.warn('The MySQL database could not be read and returned the following error %d: %s', (e.args[0], e.args[1]))
attempts += 1
if attempts == sql_retries:
logging.error('All configured attempts to read the MySQL database have failed. We are going to skip this attempt.')
time.sleep(sql_interval)
return oldtemp, oldhumid

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python_code/temp-humid-read-loop.py Executable file
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#/usr/bin/env python
# -*- coding:utf-8 -*-
import sys
import dhtreader
import updateMysql
import ConfigParser
import time
from time import strftime
from threading import Timer,Thread,Event
import logging
from datetime import datetime
from datetime import timedelta
oldtemp = "NULL"
oldhumid = "NULL"
def exec_every_n_seconds(n,f,*args):
waitInterval = timedelta(seconds=n)
logging.debug('We should read the sensor every {0} seconds'.format(waitInterval))
duration=f(*args)
offset = waitInterval - duration
logging.debug('Running the loop again in {0} seconds (printed as datetime)'.format(offset))
offset2 = offset.total_seconds()
logging.debug('Running the loop again in {0} seconds (printed as float)'.format(offset2))
while 1:
logging.debug('We are in the loop now ...')
initTime=time.time()
logging.debug('Start time is {0}'.format(initTime))
#time.sleep(offset2)
logging.debug('We are about to run the sensor read again')
duration=f(*args)
offset2 = (60.0 - (time.time() - initTime))
time.sleep(60.0 - ((time.time() - initTime) % 60.0))
logging.debug('Duration of sequence was: {0}'.format(duration))
offset = waitInterval - duration
logging.debug('Running the loop again in {0} seconds (printed as dateime)'.format(offset))
#offset2 = offset.total_seconds()
logging.debug('Running the loop again in {0} seconds (printed as float)'.format(offset2))
def sensorRead(hwtype, pin, retries, timeout, maxtemp, mintemp, tempdiff, maxhumid, minhumid, humiddiff):
global oldtemp
global oldhumid
startTime=datetime.now()
logging.debug('This round of results started at {0}'.format(startTime))
for num in range(retries):
try:
t, h = dhtreader.read(dev_type, dhtpin)
except:
if ((num + 1) < retries):
logging.warning('Exception detected! We will retry. Loop number: %d', num)
time.sleep(timeout)
else:
logging.error('Exception detected - we are out of retries. Skipping the measurement in this cycle.')
else:
if t and h:
logging.debug('Temperature and humidity read as {0} and {1}'.format(t, h))
logging.debug('Temperature and Humidity differences allowed: {0} and {1}'.format(tempdiff, humiddiff))
if (oldtemp != "NULL") and ((t - oldtemp < tempdiff) or (oldtemp - t < tempdiff)) and ((h - oldhumid < humiddiff) or (oldhumid - h < humiddiff)):
logging.debug('Current temperature close enough to previous temperature and previous temperature is not NULL, it is: %s', oldtemp)
logging.debug('Current humidity close enough to previous humidity and previous humidity is not NULL, it is: %s', oldhumid)
if (t < maxtemp) and (t > mintemp) and (h < maxhumid) and (h > minhumid):
logging.debug('Temperature is less than {0} and greater than {1}, humidity is less than {2} and greater than {3}'.format(maxtemp,mintemp,maxhumid,minhumid))
updateMysql.main(t, h, host, db, username, password, logging, sql_retries, sql_timeout)
oldtemp=t
oldhumid=h
break
else:
logging.error('Temperature {0} or humidity {1} is outside of allowable values - error! Check your configuration.'.format(t, h))
else:
logging.warning('Failed to read from sensor, maybe try again?')
endTime=datetime.now()
logging.debug('This round of results ended at {0}'.format(endTime))
duration = endTime - startTime
logging.debug('This round of results took {0} to complete'.format(duration))
return duration
DHT11 = 11
DHT22 = 22
AM2302 = 22
config = ConfigParser.ConfigParser()
config.read('/etc/thMonitor.conf')
hwtype=config.get('hardware', 'DHT')
pin=config.get('hardware', 'PIN')
retries=int(config.get('software', 'retries'))
timeout=int(config.get('software', 'timeout'))
interval=int(config.get('software', 'interval'))
maxtemp=int(config.get('software', 'maxtemp'))
mintemp=int(config.get('software', 'mintemp'))
tempdiff=int(config.get('software', 'tempdiff'))
maxhumid=int(config.get('software', 'maxhumid'))
minhumid=int(config.get('software', 'minhumid'))
humiddiff=int(config.get('software', 'humiddiff'))
logfile=(config.get('software', 'logfile'))
loglevel=(config.get('software', 'loglevel'))
host=(config.get('database', 'host'))
db=(config.get('database', 'db'))
username=(config.get('database', 'username'))
password=(config.get('database', 'password'))
sql_retries=int((config.get('database', 'sql_retries')))
sql_timeout=(config.get('database', 'sql_timeout'))
if loglevel == "debug":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.DEBUG)
elif loglevel == "info":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.INFO)
elif loglevel == "warn":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.WARNING)
elif loglevel == "error":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.ERROR)
else:
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.CRITICAL)
dhtreader.init()
dev_type = None
if hwtype == "11":
dev_type = DHT11
logging.info('Configured to use DHT11 device')
elif hwtype == "22":
dev_type = DHT22
logging.info('Configured to use DHT22 device')
elif hwtype == "2302":
dev_type = AM2302
logging.info('Configured to use AM2303 device')
else:
logging.warn('Invalid hardware type, only DHT11, DHT22 and AM 2302 are supported for now.!')
sys.exit(3)
dhtpin = int(pin)
if dhtpin <= 0:
logging.warn("Invalid GPIO pin#, correct your configuration file")
sys.exit(3)
logging.info("using pin #{0}".format(dhtpin))
logging.info('Multiple (infinte looped) run temperature and humidity reading. [version: 1.0, Jonathan Ervine, 2015-06-17]')
logging.debug("About to enter infinite loop")
exec_every_n_seconds(60,sensorRead,hwtype,pin,retries,timeout,maxtemp,mintemp,tempdiff,maxhumid,minhumid,humiddiff)

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python_code/temp-humid-read-single.py Normal file
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#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys
import dhtreader
import updateMysql
import readMysql
import ConfigParser
import logging
import time
from time import strftime
from datetime import datetime
from datetime import timedelta
oldtemp = "NULL"
oldhumid = "NULL"
def sensorRead(hwtype, pin, retries, timeout, maxtemp, mintemp, tempdiff, maxhumid, minhumid, humiddiff):
global oldtemp
global oldhumid
oldtemp, oldhumid = readMysql.main(host, db, username, password, logging, sql_retries, sql_timeout)
logging.debug('We have returned the following previous temperature {0} and humidity {1} values.'.format(oldtemp, oldhumid))
for num in range(retries):
try:
t, h = dhtreader.read(dev_type, dhtpin)
except:
if ((num + 1) < retries):
logging.warning('Exception detected! We will retry. Loop number: %d', num)
time.sleep(timeout)
else:
logging.error('Exception detected - we are out of retries. Skipping the measurement in this cycle.')
else:
if t and h:
logging.debug('The temperature and humidity have been read as {0} and {1}'.format(t, h))
if (oldtemp != "NULL") and ((t - oldtemp < tempdiff) or (oldtemp - t < tempdiff)) and ((h - oldhumid < humiddiff) or (oldhumid - h < humiddiff)):
logging.debug('Current temperature close enough to previous temperature and previous temperature is not NULL, it is: %s', oldtemp)
logging.debug('Current humidity close enough to previous humidity and previous humidity is not NULL, it is: %s', oldhumid)
if (t < maxtemp) and (t > mintemp) and (h < maxhumid) and (h > minhumid):
logging.debug('Temperature is less than {0} and greater than {1}, humidity is less than {2} and greater than {3}'.format(maxtemp,mintemp,maxhumid,minhumid))
updateMysql.main(t, h, host, db, username, password, logging, sql_retries, sql_timeout)
oldtemp=t
oldhumid=h
break
else:
logging.error('Temperature {0} or humidity {1} is outside of allowable values - error! Check your configuration.'.format(t, h))
else:
logging.warning('Failed to read from sensor, maybe try again?')
return 0
DHT11 = 11
DHT22 = 22
AM2302 = 22
config = ConfigParser.ConfigParser()
config.read('/etc/thMonitor.conf')
hwtype=config.get('hardware', 'DHT')
pin=config.get('hardware', 'PIN')
retries=int(config.get('software', 'retries'))
timeout=int(config.get('software', 'timeout'))
interval=int(config.get('software', 'interval'))
maxtemp=int(config.get('software', 'maxtemp'))
mintemp=int(config.get('software', 'mintemp'))
tempdiff=int(config.get('software', 'tempdiff'))
maxhumid=int(config.get('software', 'maxhumid'))
minhumid=int(config.get('software', 'minhumid'))
humiddiff=int(config.get('software', 'humiddiff'))
logfile=(config.get('software', 'logfile'))
loglevel=(config.get('software', 'loglevel'))
host=(config.get('database', 'host'))
db=(config.get('database', 'db'))
username=(config.get('database', 'username'))
password=(config.get('database', 'password'))
sql_retries=int((config.get('database', 'sql_retries')))
sql_timeout=(config.get('database', 'sql_timeout'))
if loglevel == "debug":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.DEBUG)
elif loglevel == "info":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.INFO)
elif loglevel == "warn":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.WARNING)
elif loglevel == "error":
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.ERROR)
else:
logging.basicConfig(filename = logfile, format='%(asctime)s %(levelname)s:%(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.CRITICAL)
dhtreader.init()
dev_type = None
if hwtype == "11":
dev_type = DHT11
logging.info('Configured to use DHT11 device')
elif hwtype == "22":
dev_type = DHT22
logging.info('Configured to use DHT22 device')
elif hwtype == "2302":
dev_type = AM2302
logging.info('Configured to use AM2303 device')
else:
logging.warn('Invalid hardware type, only DHT11, DHT22 and AM 2302 are supported for now.!')
sys.exit(3)
dhtpin = int(pin)
if dhtpin <= 0:
logging.warn("Invalid GPIO pin#, correct your configuration file")
sys.exit(3)
logging.info("using pin #{0}".format(dhtpin))
logging.info('Single run temperature and humidity reading. [version: 1.0, Jonathan Ervine, 2015-06-17]')
sensorRead(hwtype,pin,retries,timeout,maxtemp,mintemp,tempdiff,maxhumid,minhumid,humiddiff)

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[hardware]
## The hardare settings of the temperature humidity monitor
# The hardware type - valid values are: 11 (DHT11 sensor), 22 (DHT22 sensor), and 2302 (AM2302 sensor)
DHT=22
# The pin number used on the Raspberry Pi board
PIN=4
[software]
# The monitoring software will retry reading the temperature and humidity readings if the sensor returns an error. The number of retries is configured here. If no valid reading is made with all attempts, no reading will be recorded in this particular monitoring cycle.
retries=3
# If the monitoring software returns an error from the temperature humidity sensor, it will wait before attempting to re-read the values. The timeout to wait between reading attempts is configured here. This value shoul dnot be set too low.
timeout=5
# The interval between reading cycles is configured here. This is sually set to 1 minute (60 seconds).
interval=60
# The maximum temperature that will be recorded by the monitoring software. Sometimes, the sensor can return an erroneous (too high) temperature reading. If the temperature returned is greater than this value, then it will be discarded, and the software will retry the sensor reading. If all readings are too high, no reading is recorded in this monitoring cycle.
maxtemp=50
# The minimum temperature that will be recorded by the monitoring software. Sometimes, the sensor can return an erroneous (too low) temperature reading. If the temperature returned is less than this value, then it will be discarded, and the software will retry the sensor reading. If all readings are too low, no reading is recorded in this monitoring cycle.
mintemp=15
# This is the maximum difference between the currently read temperature and the previously recorded temperature. If the difference is greater than this value, the reading is discarded and the software will retry the sensor reading. This should ensure that any erroneous readings are not used.
tempdiff=10
# The maximum humidity that will be recorded by the monitoring software. Sometimes, the sensor can return an erroneous (too high) humidity reading. If the humidity returned is greater than this value, then it will be discarded, and the software will retry the sensor reading. If all readings are too high, no reading is recorded in this monitoring cycle.
maxhumid=80
# The minimum humidity that will be recorded by the monitoring software. Sometimes, the sensor can return an erroneous (too low) humidity reading. If the humidity returned is less than this value, then it will be discarded, and the software will retry the sensor reading. If all readings are too low, no reading is recorded in this monitoring cycle.
minhumid=20
# This is the maximum difference between the currently read humidity and the previously recorded humidity. If the difference is greater than this value, the reading is discarded and the software will retry the sensor reading. This should ensure that any erroneous readings are not used.
humiddiff=10
# The name and location of the logfile
logfile=/var/log/th-python.log
# The logging level (available: debug, info, warn, error, or critical). The default is critical.
loglevel=debug
[database]
## MySQL Database connectivity settings
# The hostname of the MySQL database server
host=localhost
# The name of the database
db=Monitoring
# The username to us to connect to MySQL (should have INSERT rights on the database)
username=USRENAME
# The password of the username above
password=PASSWORD
# This is the maximum number of retries made to update the MySQL database with the data. If these all fail, the failure is recorded, but the daemon should continue to run
sql_retries=3
# This is the timeout between retries when updating the MySQL database. It is useful to set this parameter and sql_retries parameter, as the thMonitor daemon frequently starts up before the MySQL daemon has finished starting.
sql_timeout=5

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#!/bin/sh
### BEGIN INIT INFO
# Provides: thMonitor
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Temperature and Humidity Monitor
# Description: Temperature and Humidity Monitoring daemon
### END INIT INFO
# Change the next 3 lines to suit where you install your script and what you want to call it
DIR=/usr/local/bin/thMonitor
DAEMON=$DIR/temp-humid-python-loop.py
DAEMON_NAME=thMonitor
# Add any command line options for your daemon here
DAEMON_OPTS=""
# This next line determines what user the script runs as.
# Root generally not recommended but necessary if you are using the Raspberry Pi GPIO from Python.
DAEMON_USER=root
# The process ID of the script when it runs is stored here:
PIDFILE=/var/run/$DAEMON_NAME.pid
. /lib/lsb/init-functions
do_start () {
log_daemon_msg "Starting system $DAEMON_NAME daemon"
start-stop-daemon --start --background --pidfile $PIDFILE --make-pidfile --user $DAEMON_USER --chuid $DAEMON_USER --startas $DAEMON -- $DAEMON_OPTS
log_end_msg $?
}
do_stop () {
log_daemon_msg "Stopping system $DAEMON_NAME daemon"
start-stop-daemon --stop --pidfile $PIDFILE --retry 10
log_end_msg $?
}
case "$1" in
start|stop)
do_${1}
;;
restart|reload|force-reload)
do_stop
do_start
;;
status)
status_of_proc "$DAEMON_NAME" "$DAEMON" && exit 0 || exit $?
;;
*)
echo "Usage: /etc/init.d/$DAEMON_NAME {start|stop|restart|status}"
exit 1
;;
esac
exit 0

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#!/usr/bin/python
##
## Script to import the temperature and humidity into a MySQL database
##
import sys
import MySQLdb
def main(temp, humid, host, db, user, passwd, logging, sql_retries, sql_timeout):
logging.debug('Temp = {0} *C, Hum = {1} %'.format(temp, humid))
logging.debug('Updating MySQL database next ...')
connection = MySQLdb.connect(host,user,passwd,db)
cursor=connection.cursor()
sqltemp=format(temp, '5.1f')
sqlhumid=format(humid, '5.1f')
logging.info('Temperature: {0}*C Humidity: {1}% ... updating to MySQL database'.format(sqltemp, sqlhumid))
sql = """INSERT INTO TempHumid (ComputerTime, Temperature, Humidity, id) VALUES (unix_timestamp(now()), %s, %s, NULL)"""
args = (sqltemp, sqlhumid)
success = False
attempts = 0
while attempts < sql_retries and not success:
try:
cursor.execute(sql, args)
connection.commit()
cursor.close()
success = True
logging.debug('The MySQL database was successfully updated.')
except MySQLdb.Error, e:
logging.warn('The MySQL database could not be updated and returned the following error %d: %s', (e.args[0], e.args[1]))
attempts += 1
if attempts == sql_retries:
logging.error('All configured attempts to update the MySQL database have failed. We are going to skip this attempt.')
time.sleep(sql_interval)
return 0

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<html>
<head>
<!--Load the AJAX API-->
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1.1', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
function drawChart() {
var jsonData = $.ajax({
url: "getData.php",
dataType:"json",
async: false
}).responseText;
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(jsonData);
// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
// assumes you have timestamps in column 0, and two data series (columns 1 and 2)
var view = new google.visualization.DataView(data);
view.setColumns([{
type: 'datetime',
label: data.getColumnLabel(0),
calc: function (dt, row) {
var timestamp = dt.getValue(row, 0) * 1000; // convert to milliseconds
return new Date(timestamp);
}
}, 1, 2]);
var options = {
title: 'Temperature and Relative Humidity over Time',
width: 900,
height: 500,
vAxis: {title: "Temperature (C) and Humidity (%)"},
hAxis: {title: "Date and Time"},
// chartArea: {'width': '100%', 'height': '80%'},
}
chart.draw(view, options);
}
</script>
<script type="text/javascript" src="jQuery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
// First load the chart once
drawChart();
// Set interval to call the drawChart again
setInterval(drawChart, 60000);
});
</script>
</head>
<body>
<!--Div that will hold the line chart-->
<div id="chart_div"></div>
</body>
</html>