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PIC House Alarm

Discussion in 'Electronic Design' started by Len, Mar 31, 2007.

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  1. Len

    Len Guest

    My house was hit by lightning and my DSC alarm system is broken, I want to
    replace this with PIC alarm system, has anyone done such a design ?
    I need about 8 Zones with 2 entry points a horn, 2 keypads and a panic
    button , also a output for a radio controlled transmitter.

    this will form part of a home automation project at the end so any ideas on
    a control bus will help as well ? Is X10 a good idea ?

    Thanks
    Len
     
  2. Why? What is the perceived benefit?
     
  3. D from BC

    D from BC Guest

    Maybe to make the world's smallest home alarm system. :)
    D from BC
     
  4. Of course people have, but I haven't.......yet. ;-) It shouldn't be all
    that hard to do, the largest amount of work will be in the user interface
    software, the actual alarm system is simple. If I were doing it for my
    home, I would make the user interface in something like VB and then use the
    VB app to shove a config table of some sort into the PIC via a serial
    interface. That would greatly simplify the PIC code.
    This is all easy enough for a microcontroller, for someone that has
    programming experience. It might be kinda tough as a starter project for a
    PIC newbie though.
    X-10 is never a "good idea". ;-) Unfortunately it's probably the most
    common power-line communication system. It is plagued by many strange and
    interesting problems, mostly fixable, some allot easier than others. What
    do you plan to automate?
     
  5. That's irrelevant.
     
  6. I posted this about a half hour ago, but it never showed up on supernews.
    :-? Sorry if you see it twice, but I typed a bunch and don't want it to go
    to waste. ;-)
    Of course people have, but I haven't.......yet. It shouldn't be all
    that hard to do, the largest amount of work will be in the user interface
    software, the actual alarm system is simple. If I were doing it for my
    home, I would make the user interface in something like VB and then use the
    VB app to shove a config table of some sort into the PIC via a serial
    interface. That would greatly simplify the PIC code.
    This is all easy enough for a microcontroller, for someone that has
    programming experience. It might be kinda tough as a starter project for a
    PIC newbie though.
    X-10 is never a "good idea". Unfortunately it's probably the most
    common power-line communication system. It is plagued by many strange and
    interesting problems, mostly fixable, some allot easier than others. What
    do you plan to automate?
     
  7. Why?
     
  8. mpm

    mpm Guest

    You can buy a new DSC panel for about $50 at ADI.
    If you have an account (you need to be a dealer)

    (Just so you know.)

    And even if you do roll your own (for education, experience, nothing
    to do on a Friday night, etc..), what's going to stop lightning from
    damaging your PIC-based "system"?

    Anyway:

    Alarm loops often have the option for terminating resistors, which
    allow you use N/O and/or N/C contacts in the loop - while still
    monitoring for an open wire condition. (ie., cut or damaged wire).

    If you decide to hook smoke detectors to your system, just remember
    you may not be living in the place "forever" and you'd be (morally)
    responsible if the thing broke later and anyone got hurt becuase it
    didn't work. (You can pretty much read that as: DSC carries product
    liability insurance which your home-grown PIC won't have.)

    Why not just fix the one you have? (Start with the communications
    lines becuase without even looking at it I can almost bet that's where
    the problem is!). Then, take a look at the lightning issues. Good
    luck.
    -mpm
     
  9. The benefit is obvious......the OP could have a functioning alarm system
    again. Now, if I might be so bold as to ask you why you asked the OP that
    question?
     
  10. If he's doing it for fun that's one thing.

    If he's trying to save money, fugedaboutit. He could have a functioning
    alarm system in a day by buying one - they aren't expensive
     
  11. Len

    Len Guest

    A alarm system is about R600.00 and yes I can have it up and running in a
    day, however

    Then my hoby won't benefit, I can't add on to the project or alarm with my
    needs in future and I can't attach it to my home-automation system later on
    at my criteria. Will have to buy an expensive home larm or expensive add-on
    modules so I rather spend some money now and save later on.

    Len
     
  12. Len

    Len Guest

    Unfortunately I am a PIC newbie :-( I can flash a LED etc. and read a input
    N/C or N/O so the PIR's I can do, However as you say the keypads ... etc. is
    the problem

    Home automation :
    I don't want to use X10 actually as that is where the problem started with a
    lightning strike traveling through my power :-( So I would rather want to
    use my own wiring (I2C ??) or RF Transmitters.

    What do I want to automate :
    1. Night/Daytie switch for fromt gate
    2. Sensor lights (With logic e.g. movement more that 2 sensors in x second
    then light the lights - to avoide plants triggering the lights)
    3. Front gate lock and intercom (On a 12V Solenoid) - with stats on when
    gate opened & closed
    4. Irrigation System ( 7 Zones)
    5. Bring the Alarm into the project

    I am busy drafting a requirement and percieved logic design for it.

    PS. I can find lots of PIC info on the web but not a lot on irrigation or
    alarms ....


    Regards,
    Len
     
  13. Len

    Len Guest

    Unfortunately all of that is fine and the zones etc. the problem is in the
    Alarm out circuit ( Horn wailing the whole time)

    I do agree with a lot of your arguements however my thoughs was to

    1. Us my hoby to do it
    2. If I sell the house most armed reaction companies include a basic alarm
    with there contracts - I'll install my PIC @ my next house :) new
    project...

    Lightning is still the concern yes, I am busy investigating means and ways
    to beter protect my elec equip , better earth etc.

    Regards
    Len
     
  14. There was a circuit for a basic PIC based alarm system, published in
    'epe', about a year ago.

    Best Wishes
     
  15. Len

    Len Guest

    Many thanks I will have a look
     

  16. How does your insurance company feel about you using a homemade alarm
    system? What will the police or fire department charge for each repeat
    false alarm? When I checked into manufacturing alarms in the '70s I
    needed at the very least, $10 million dollars of Liability insurance,
    even if only one alarm was built.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  17. And of what relevance is any of this? The OP didn't ask for legal advice,
    he asked for technical advice. Unless he's looking for some kind of
    discount, I doubt his insurance company gives a damn about it. What makes
    you think that his own system would be any more prone to false alarms than a
    "professional" system anyway? Aren't most false alarms caused by the
    sensors?
    Y que? That's because you wanted to sell them, right?....not just build one
    for your own amusement.
     

  18. Using it to monitor your home can bring on liability issues. That is
    not "for your own amusment".

    Some police department s bill for false alarms. thne reports are
    made availible to your insurance company. DWTFYW.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  19. Whatever.........The OP didn't even say it was going to be monitored by an
    official agency, he just said he wanted to build a replacement alarm.
    You're sounding like he's already putting life and limb at risk.
    Real mature response, but I will continue to do exactly that. :-/
     

  20. He's in Africa, so who knows. Some police departments won't give any
    priority to calls made by non approved equipment, and will charge the
    full fines for any false alarms. Some departments refuse to respond at
    all after a set number of false alarms in a set period.

    He may well be putting himself at risk, if his skills aren't up to
    the task.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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