Climate Monitoring WEB Interface Using 1_Wire™ Sensors

Imad HoteitHassan Wehbe

Outline

Project SummaryFunctional DescriptionModes of OperationDatabase updatesFlowchartsTestingSchedule of tasks

Project Summary

The purpose of this project is to set up these sensors, create a user-friendly web based interface (applet) and a database that will hold previous data and provide query abilities to the applet.

Functional Description

Hardware Interface– The sensors will be distributed along two wires

that go through different rooms of Jobst hall; these are connected to the HA5 adapter.

Functional Description

Functional Description

Applet– The applet will run on a web server and will

query the sensors for readings.– Data will be recorded in a database for later

use.– Many applications could be added to the applet

making use of the records in the database.

Functional Description

GUI/Applet

Mouse/keyboard

Screen

User

TCP/IPDSTP

TCP/IPHTTP

Modes of Operation

Applet– Display historical data– Get immediate sensor update

Sensor Query Daemon– Discover sensors on network– Request sensor readings– Update database

Database updates

The MySQL database has four tables (so far):– Temprerature

• timestamp, sensorid, temp_R, temp_V– Light

• timestamp, sensorid, on– Humidity

• timestamp, sensorid, temp_R, temp_V, hmd_R, hmd_V– Data

• sensorid, type, timestamp

Applet Flowchart

Start

Initialize and Display

Graph Displayed

Room where sensor is

shown

LightsHumidityTemperature

Room Sensor Is Located in, Value

Read, Time of Reading

CGI Script Flowchart

StartRead From The

DatabasePrint The Data To

HTML

Connect to theDatabase Using

DBI and MySql++

The GUI

What’s behind the applet?– JDBC: status unsuccessful– Perl/CGI Script: Status successful

The applet:– Main– Temperature– Humidity

The GUI

The applet (continued):– Lights– Chart for the values read by each sensor– Navigation controls– Hopefully a software to let the administrator draw the

room

Tentative

We were thinking of making use of a program similar to these 1 2It would need some tweaking, yet would allow the administrator to create a custom made rooms and specify the position of the sensors within those rooms.

Sensor Query Daemon Flowchart

Create aconnection to

database

Create aconnection toHA5 adapter

through serialport

Discover allsensors

Send 'aS,FF'command

Updatedatabase with

new values

Query sensorsperiodically

Start

Sensor Query Daemon

The server application uses two classes– HA5– Sensor_DB

The reasons for object oriented programming are– Anticipated growth– Ease of debugging– Clarity of code

HA5

Open connectionClose connection DestructorSearch: all, by family, by conditionSelect one sensorRead:– Light switch– Temperature value– Humidity ratio

Sensors_DB

Open connectionClose connection DestructorSearch:– All tables– By sensorid, by type

Insert/Update a row//Delete a row…used for troubleshooting

Division of work

Hassan:• Java Applet • Perl/ CGI script

Imad:• C++• Hardware Interface

Schedule of Future Tasks

Schedule of Future Tasks

Climate Monitoring WEB Interface

Questions