Searching \ for 'Home security system' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=home+security+system
Search entire site for: 'Home security system'.

Truncated match.
PICList Thread
'Home security system'
1999\05\07@154211 by D'hondt Jean-Paul

flavicon
face
Hi all

I want to make a home security system using a keypad and lcd (outdoors)
IRsensor and everyboddy has his own code ,rs232 to display something on pc
,when someone has put the system on or off
date and hour et...
Dus someone know where i can get info ??? I am learning to program the PIC's
and have all the hardware to progam them.
I have look almost everywhere and could'n find something HAI.

73 de Jean-Paul
spam_OUTon4bdjTakeThisOuTspampandora.be

1999\05\11@201312 by D'hondt Jean-Paul

flavicon
face
>>Hi all
>>
>>I want to make a home security system using a keypad and lcd (outdoors)
>>IRsensor and everyboddy has his own code ,rs232 to display something on pc
>>,when someone has put the system on or off
>>date and hour et...
>>Dus someone know where i can get info ??? I am learning to program the
>PIC's
>>and have all the hardware to progam them.
>>I have look almost everywhere and could'n find something HAI.
>>
>>73 de Jean-Paul
>>.....on4bdjKILLspamspam@spam@pandora.be
>>
>

1999\05\13@094715 by Byron A Jeff

face picon face
>
> >>Hi all
> >>
> >>I want to make a home security system using a keypad and lcd (outdoors)
> >>IRsensor and everyboddy has his own code ,rs232 to display something on pc
> >>,when someone has put the system on or off
> >>date and hour et...
> >>Dus someone know where i can get info ??? I am learning to program the
> >PIC's
> >>and have all the hardware to progam them.
> >>I have look almost everywhere and could'n find something HAI.

While no one may not have put each of the pieces together, they all exist
separately. Simply look in the archives (Can someone post the URL where
the archives can be found?) for the individual parts, RS-232, keypad, and
LCD.

The toughest part is going to be the sensors. Door loops are subject to quite
a bit of noise. In my prototype alarm system (which used a button and beeper
interface, i.e. three beeps to activate, two to disarm, 4 for status) the
door loop falsely triggered until I debounced with a 200ms debounce routine.

The slickest part of that prototype was the use of cheap PIR floodlights
as motion detectors. Instead of spending $35-$50 apiece for 12V PIRs, I bought
a $10 motion flood and hacked it. While I know it's possible to strip the
flood down to the circuit board and a low voltage DC interface, it was more
expidient to utilize the existing 120V AC interface that the floodlight uses.
Here's what I did.

1) Removed the flood sockets and cut the 120V interface wires.
2) Attached the 120V interface wires to an optoisolator and a reversed biased
led through a 10Kohm 2W resistor.
3) Drove a 12V signal through the transistor side of the optoioslator, creating
a low voltage interface through the house and to the PIC.
4) Attached the 12V interface to a second optoioslator which then drove the
PIC input pin.

The result is an extremely clean optoisolated 60 Hz square wave whenever the
motion flood was triggered. Even better they fit in standard round electrical
boxes that are easily mounted in the ceiling.

Finishing this project is on my infamous 9 billion things to do list, but
the prototype worked quite well.

Hope this helps,

BAJ

1999\05\13@133033 by ShadeDemon

picon face
Byron A Jeff wrote:
> The toughest part is going to be the sensors. Door loops are subject to quite
> a bit of noise. In my prototype alarm system (which used a button and beeper
> interface, i.e. three beeps to activate, two to disarm, 4 for status) the
> door loop falsely triggered until I debounced with a 200ms debounce routine.
>
> 2) Attached the 120V interface wires to an optoisolator and a reversed biased
> led through a 10Kohm 2W resistor.

 Just a note on the door loops, it's best to use a say 4.7k
resistor at the sensor end, and a resistor at the alarm
end.   Then use a 339 set up for a window comparator around
2.5V.  That way, even if they short or open the wire, it
still goes off.  Any halfway competent thief can bypass a
cheap system without this by shorting the wires.  And a 339
and a few resistors is cheap anyway.
 Also, I know you're talking simple here, but never trust
an all wireless system.  Amazing how many expensive alarms
can be walked through by setting a signal gen to ~318 MHz
and cranking up the power from outside the house.  Good ones
will still go off after a few minutes of no reports, but do
this a few days running and the police stop coming..
 Still seems just as easy to hack back before the triac,
but at least you did #2!!  Amazing how many commercial
devices violate the PRV spec, even though most magically
keep working anyway..

1999\05\13@181128 by Julian Fine

flavicon
face
>Byron A Jeff wrote:

>  Also, I know you're talking simple here, but never trust
>an all wireless system.  Amazing how many expensive alarms
>can be walked through by setting a signal gen to ~318 MHz
>and cranking up the power from outside the house.  Good ones
>will still go off after a few minutes of no reports, but do
>this a few days running and the police stop coming..

You obviously have not heard of Spatial diversity receivers and what burglar
hauls a sig gen with enough power to block
a signal from outside the house.
However
In South Africa the standard burglar tools are a 1k and a 2k2 resistors
jumper cables and a sidecutters, With this they bypass all
FBII , Paradox , Napco etc WIRED panels.

Wireless Forever.
************* Julian Fine ***********
********** julianspamKILLspamfine.co.za ********
******* http://www.fine.co.za *******
** http://www.eagle-wireless.co.za **

1999\05\15@042935 by Dr. Imre Bartfai

flavicon
face
Hi,
the 16C62x series have a built-in comparator. Or, you can measure the loop
balance value with 16C7x as A/D.
Imre


On Thu, 13 May 1999, Alan King wrote:

{Quote hidden}

More... (looser matching)
- Last day of these posts
- In 1999 , 2000 only
- Today
- New search...