[Asterisk-Users] door phone

[Jon Pounder]

I posted my solution yesterday and it is $50 so not sure why people are
still asking for a cheap solution.

I have a cheap disposable "walmart" phone on the channel bank, in
immediate mode so when it is picked up it jumps immediately to the default
context.

I can also dial it like any other extension to talk to people at the door.

I have a $20 electric strike on the door which is coupled to my burglar
alarm (that I can use a keypad outside to open right now) to interface to
asterisk all I need is the following about $5 worth of stuff.

10k resistor from one of the data lines on the parallel port to base of a
2n2222 transistor, emitter of 2222 to ground/earth, collector to a coil of
a 12vdc pcb mount relay, 1n400x diode in inverse parallel with the coil to
kill spikes, other end of the diode/coil to 12vdc from a disk drive
connector in the pc. normally open contacts of the coil in parallel with
whatever else drives the door strike (normally a 12-24AC/DC supply - AC if
you like that Buzz, DC if a click is more your liking.)


Make a simple agi script either using system command or in C - output a 1
to the bit of the parport, wait 5seconds, output a 0. Done.

Much less than $50 - parts avail - Radio Shack or Dick Smith (are they
still around in AU ?) Digikey is another fine source.



> asterisk-users-admin at lists.digium.com <> wrote:
>>> Hi,
>>>
>>> Anyone know anything about Asterisk's support for door phones?
>>> Receiving the call from the door intercom system, opening the door,
> etc?
>>>
>>> Any hardware recommendations? I understand that the equipment we
>>> have now is Panasonic proprietary and came with the currently
>>> deployed Panasonic TD12-32 pbx.
>>>
>>> We intend to deploy Asterisk in a 72 extensions + 16 trunks in a
>>> while, so any info will be great.
>>>
>>> thanks
>>
>> While this isn't an Asterisk question, I guess, I find it hard not to
>> comment on a particularly excellent piece of equipment which which
> I've
>> worked previously:
>
> John Todd said:
>> Can be ordered from Grainger (at least, two years ago it could) here
>> in North America under part number 4RR12 "Emergency Access Phone" for
>> $623.50.  I'm sure you can find it elsewhere, too.
>
> Ummm, you might go to that level for a large office/block of units or
> campus environment etc, but I was looking for something for home (mainly
> just for the coolness factor).
>
> Something where I can sit in my car in the pouring rain, dial into
> asterisk from my mobile, enter some pin code etc, have the door open,
> and then dash to the door with some bags/boxes etc and not have to
> fumble for keys.
>
> Another thought is the possibility of having small cameras mounted
> around the home linked to a linux box. Someone turns up and presses the
> intercom, since you are 'logged out' asterisk forwards the call to your
> mobile (or work phone etc). You answer the call, log onto your webcam,
> and let them in. You now watch what they are doing until they leave.
>
> Of course, you might not *really* want to do this in practice else you
> may end up with 'blind spots' and it will still take you a really long
> time to get there and try and stop them from doing whatever it is they
> are doing...
>
> Of course, it might be your girlfriend/mother/etc in which case you
> hopefully trust them a little.
>
> So, anyone got a solution for under AUD$100 ?
> Surely this is really just a bunch of cheap/commodity electronic
> components?
>
> Regards,
> Adam
>
>  --
> Adam Goryachev
> Website Managers
> Ph:  +61 2 9345 4395                        adam at websitemanagers.com.au
> Fax: +61 2 9345 4396                        www.websitemanagers.com.au
>
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