[ILUG] OT - Good burglar alarms with a serial port
stevemccullagh at gmail.com
Wed Dec 3 23:43:44 GMT 2008
I believe HKC's Smartwatch has an RS232 port on it but haven't done
much meddling with it.
I've got an automated SMS from it working nicely, but this is from an
extra card, it tells you the zone etc. from an SMS sent by the
landline, I think the SMS card is connected to the RS232 port on the
alarm board, which should be what you require.
On 3 Dec 2008, at 18:35, Philip Trickett (List) wrote:
> On Wed, 2008-12-03 at 18:04 +0000, Michael Watterson wrote:
>> Philip Trickett (List) wrote:
>>> I just thought I would ask here, as I seem to remember a blog
>>> entry of
>>> someone on ILUG about an automated sms from his linux box when his
>>> burglar alarm was activated.
>>> Does anyone have an alarm with an RS232 port, and if so, is it any
>>> I was thinking of linking it in with either Mythtv or with
>>> so when it is activated, I could get an email with a picture
>>> or log in from my mobile to check cameras in the house.
>> Wire the alarm output relay contact to a serial port Handshake in
>> (choice of two main ones). Do what ever you like when it changes.
>> If TXD
>> or one of the two output handshake lines is connected via 10k Ohm
>> resistor, the handshake line will be by default +5V to +12V. The
>> contact closing puts it to zero.
>> ANY alarm can be wired up this way.
>> Polling the state of the handshake every 20 seconds is more than
>> adequate and little overhead.
> Good idea, and one I might pursue.
> I was looking more from the point of trying to get more information
> the alarm, such as what zone or sensor triggered the alarm, whether
> there are any faults etc.
> That way, it could be used to determine if say a garage door had been
> triggered, rather than front door / back door etc.
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