Current firmware of this system presents interactive control system through the RS232 interface. This control system consist with the menu driven configuration options, self tests, system report generators, etc.
This system also contain 5W (with 4Ω speaker) audio alarm with three selectable tone configurations, which include Police siren, Fire engine siren and Ambulance siren.
This system uses a Microchip’s PIC16F877A as a main controller, LM339 as sensor interface, UM3561 as a tone generator and μPC2002 as a speaker driver (audio amplifier). LM7805, LM7812 and LM317 voltage regulators are used to obtain +5V, +12V and +3V respectively.
All the project source codes, schematic diagrams and PCB patterns are available in http://elect.wikispaces.com with terms and conditions of GNU GPL and Creative Commons - Attribution-ShareAlike 3.0 Unported license.
4 comments:
Without a doubt, protecting a home with a cheap, wireless house alarm is certainly better than leaving the home completely unprotected.
Fire alarm is very important at home, in buildings and establishments. There are many kinds of alarm today. There are alarms that can contact fire department, paramedics and police department immediately by just touching the button. Fire alarm system is there to protect us and our investments.
Burglars don't ever like home security systems so when they come across a home that has a home security system installed, they prefer to go elsewhere, hence, your possessions are kept safe.
One very important element of having an alarm system in the house is those stickers and little signs on houses already equipped with one. More often than not, these signs have a psychological effect on potential home invaders that may help you even you ward them off even when you have forgotten to turn the system on.
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