References

The circuit idea was obtained from an online webpage called “Silicon Chip”
Following is the list of electronic reference books which are fundamental to my circuit components and operation;

1) Low Voltage Wiring: Security/Fire Alarm Systems ,Terry Kenedy , 1996,Mc Graw-Hill
2) Intruder Alarms , Gerard Honey , Mc Graw Hill
3) Modern Control Engineering , Ogata Katsuhiko , Prentice Hall.
4) Digital Logic State Machine Design Third Edition by David J.Comer, Saunders College Publishing, 1995.
5) Management of Knowledge in Project Environments , Patrick Fong , Prentice Hall
6) Swimming Pool Inspection, Safety, Maintenance , Show Me How Videos
7) Electrical & Electronic Technology Eighth Edition by I Mckenzie Smith with John Hiley and Keith Brown, Prentice Hall 2002.
8) Power Electronics by Marvin J.Fisher, PWS-Kent Publishing Company, 1991.
9) Electronic Devices and Circuit Theory Eighth Edition International Edition by Robert L.Boylestad and Louis Nashelsky, Prentice Hall, 2002.
10) Digital Fundamentals Eighth Edition International Edition by Thomas L.Floyd, Prentice Hall, 2003.
11) Modern Control Systems by Nise Norman,Cummings Publishing Co.

To obtain data sheets for the ICs and components that was used in my circuit, I have browsed the following websites;

1) http://datasheetcatalogue.com
2) http://www.rsmalaysia.com
3) http://www.farnell.com
4) http://focus.ti.com/docs/prod/folders/print/tl062.html
5) http://www.chipdocs.com/datasheets/datasheet-pdf/SGSThomson-Microelectronics/TL062.html
6) http://www.edaboard.com/ftopic327824.html
7) http://www.fairchildsemi.com
8) http://www.hobbyengineering.com
9) http://everything2.com/title/555+Timer
10) http://www.semtech.co.uk
11) http://www.eztechsystems.com
12) http://www.linxtechnologies.com/
13) http://www.mistersoft.org/freelancing/getafreelancer/2009/06/Electronics-Wireless-Simple-transmitter-and-reciever-schematic-446072.html
14) http://www.epanorama.net/wwwboard/messages/8300.html
15) http://www.play-hookey.com/digital/experiments/rtl_schmitt.html
16) http://www.electronics-tutorials.com/filters/low-pass-filters.htm
17) http://www.safetyalarms.com/
18) http://www.sonarguard.com/#
19) http://www.jclahr.com/science/psn/zero/winding/gravity_sensor.html
20) http://www.electronics-manufacturers.com/products/sensors-transducers-detectors/piezoelectric-transducer/
21) http://www.ndted.org/EducationResources/CommunityCollege/Ultrasonics/EquipmentTrans/piezotransducers.htm
22) http://home.cogeco.ca/~rpaisley4/LM7555.html#30