[Asterisk-Users] door phone

Post by Shoval Tomer
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.

I have a Door King model 1812 working with *. It is running on an X100P port with fxs_ks signalling. It works very well. The visitor pushes a button on the 1812 and the device comes off hook. I have the `s` extension set to auto dial the attendant. After the attendant decides to let them in, they press `9`. This is configurable.

I actually have it running over an 802.11b link to the front gate entrance.

You could probably operate it successfully on an fxo port from a channel bank as well, that's what the installation manual actually referred to.

Walker

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

--
******** DataCrest, Inc. -- Technically Superior ******************
Walker Haddock http://www.datacrest.com
DataCrest, Inc. e-mail: ***@datacrest.com
1634A Montgomery Hwy. phone: 1-888-941-3282, 1-205-335-8589
Birmingham, AL 35216 fax: 1-205-823-7838
***********************************************************************

Jon Pounder

2003-11-26 23:12:25 UTC

I just use an ordinary "disposable" phone, and put the zap channel in
immediate mode. lift the phone and it starts to ring the extensions in the
context it jumps to. I can also call the doorphone just like any other
extension and it rings when I do so. Basically the keypad is ignored on
the phone.

as for door release, I have an electric strike on my dsc alarm system, but
I have just not gotten around to making an agi that I can use to flip a
bit on the parallel port and have that release the strike as well.

(2n2222, a 10k resistor, and a pcb mount 12v relay, and a flyback diode,
hooked up to the data bit, and in parallel with the alarm release relay.)

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

Steve Kann

2003-12-01 14:46:34 UTC

For a door release, I have a cheap radio-shack device which is supposed
to light up a lamp when a phone rings. Basically, it has a contact
which is activated by the ring signal on a telephone line.

I wired this up to the door release in the office, and have it hooked
up to our (non asterisk) PBX. So, anyone can open the door by dialing
the extension. The ringing itself opens it.

The radio shack doojigger was probably about 10 bucks.

-SteveK

I just use an ordinary "disposable" phone, and put the zap channel in
immediate mode. lift the phone and it starts to ring the extensions in the
context it jumps to. I can also call the doorphone just like any other
extension and it rings when I do so. Basically the keypad is ignored on
the phone.
as for door release, I have an electric strike on my dsc alarm system, but
I have just not gotten around to making an agi that I can use to flip a
bit on the parallel port and have that release the strike as well.
(2n2222, a 10k resistor, and a pcb mount 12v relay, and a flyback diode,
hooked up to the data bit, and in parallel with the alarm release relay.)

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

_______________________________________________
Asterisk-Users mailing list
http://lists.digium.com/mailman/listinfo/asterisk-users

Jon Pounder

2003-12-01 15:10:03 UTC

That's an interesting solution.

Caveats :

- To have a door phone and door release would require 2 ports on the pbx
unless you don't want to be able to call the doorphone, or release the
door while the caller is still on the line.

- if the doorphone is a regular phone and uses this method, anyone could
simply apply 120VAC to the phone jack for it and presto, the door opens.

Post by Steve Kann
For a door release, I have a cheap radio-shack device which is supposed
to light up a lamp when a phone rings. Basically, it has a contact
which is activated by the ring signal on a telephone line.
I wired this up to the door release in the office, and have it hooked
up to our (non asterisk) PBX. So, anyone can open the door by dialing
the extension. The ringing itself opens it.
The radio shack doojigger was probably about 10 bucks.
-SteveK

I just use an ordinary "disposable" phone, and put the zap channel in
immediate mode. lift the phone and it starts to ring the extensions in the
context it jumps to. I can also call the doorphone just like any other
extension and it rings when I do so. Basically the keypad is ignored on
the phone.
as for door release, I have an electric strike on my dsc alarm system, but
I have just not gotten around to making an agi that I can use to flip a
bit on the parallel port and have that release the strike as well.
(2n2222, a 10k resistor, and a pcb mount 12v relay, and a flyback diode,
hooked up to the data bit, and in parallel with the alarm release relay.)

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

_______________________________________________
Asterisk-Users mailing list
http://lists.digium.com/mailman/listinfo/asterisk-users

Steve Kann

2003-12-02 02:05:04 UTC

Post by Jon Pounder
That's an interesting solution.
- To have a door phone and door release would require 2 ports on the pbx
unless you don't want to be able to call the doorphone, or release the
door while the caller is still on the line.

Yes, I am using 2 ports for this. Otherwise, the door would open if
you just wanted to ring the phone outside the door. I have 2
extensions, (1) front door, and (2) front door release.

I have my PBX set up so that if you dial the release extension, it
rings once or twice, and then hangs up the call. This way, people can
program their phone for the release, and just press a button on their
phone to open the door. (for example, if someone just rings the
doorbell or knocks, instead of calling).

As it happens, the contactor also closes a nice 12V (or something like
that, circuit), and I added another cheap piezo buzzer, because the
system I had didn't have any buzzer sounds..).

Post by Jon Pounder
- if the doorphone is a regular phone and uses this method, anyone could
simply apply 120VAC to the phone jack for it and presto, the door opens.

If you used just one extension for both, and the phone jack was
accessible, and the person had a source of 120V nearby. (or brought 10
9v batteries with them for 90V).

But, there's probably easier ways to defeat electric door releases than
all that.

I just use an ordinary "disposable" phone, and put the zap channel in
immediate mode. lift the phone and it starts to ring the extensions
in
the
context it jumps to. I can also call the doorphone just like any other
extension and it rings when I do so. Basically the keypad is ignored on
the phone.
as for door release, I have an electric strike on my dsc alarm
system,
but
I have just not gotten around to making an agi that I can use to flip a
bit on the parallel port and have that release the strike as well.
(2n2222, a 10k resistor, and a pcb mount 12v relay, and a flyback diode,
hooked up to the data bit, and in parallel with the alarm release relay.)

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

_______________________________________________
Asterisk-Users mailing list
http://lists.digium.com/mailman/listinfo/asterisk-users

Tom Shoval

2003-11-26 22:18:09 UTC

a. thanks, looks great.
b. can anyone recommend a solution that costs "a little" under a 1000$ ?

-----Original Message-----
From: asterisk-users-***@lists.digium.com
[mailto:asterisk-users-***@lists.digium.com] On Behalf Of Walker Haddock
Sent: Thursday, November 27, 2003 2:05 AM
To: asterisk-***@lists.digium.com
Subject: Re: [Asterisk-Users] door phone

I have a Door King model 1812 working with *. It is running on an X100P
port with fxs_ks signalling. It works very well. The visitor pushes a
button on the 1812 and the device comes off hook. I have the `s` extension
set to auto dial the attendant. After the attendant decides to let them in,
they press `9`. This is configurable.

I actually have it running over an 802.11b link to the front gate entrance.

You could probably operate it successfully on an fxo port from a channel
bank as well, that's what the installation manual actually referred to.

Walker

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

Jorge Mendoza

2003-11-27 00:17:14 UTC

Post by Tom Shoval
a. thanks, looks great.
b. can anyone recommend a solution that costs "a little" under a 1000$ ?

See "Door Entry Systems" at www.vikingelectronics.com

Jorge

Post by Tom Shoval
-----Original Message-----
Sent: Thursday, November 27, 2003 2:05 AM
Subject: Re: [Asterisk-Users] door phone

I have a Door King model 1812 working with *. It is running on an X100P
port with fxs_ks signalling. It works very well. The visitor pushes a
button on the 1812 and the device comes off hook. I have the `s` extension
set to auto dial the attendant. After the attendant decides to let them in,
they press `9`. This is configurable.
I actually have it running over an 802.11b link to the front gate entrance.
You could probably operate it successfully on an fxo port from a channel
bank as well, that's what the installation manual actually referred to.
Walker

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

a***@lists.styx.org

2003-11-27 00:50:57 UTC

Post by Walker Haddock
I actually have it running over an 802.11b link to the front gate entrance.

So if I can inject RTP or IAX2 frames I can open your
front door? Cool! keyless entry!

;)

--
/~\ The ASCII Ribbon Campaign
\ / No HTML/RTF in email
X No Word docs in email
/ \ Respect for open standards

Jon Pounder

2003-11-27 00:51:43 UTC

Post by Jorge Mendoza

Post by Tom Shoval
a. thanks, looks great.
b. can anyone recommend a solution that costs "a little" under a 1000$ ?

See "Door Entry Systems" at www.vikingelectronics.com

my solution uses a $12 walmart phone, and a $20 door strike, you can't get
much less expensive than that. If the posted solution uses an fxo port you
likely can't call it either. I still have a conventional doorbell, and if
someone rings it I can call the door to see who is there.

Post by Jorge Mendoza
Jorge

Post by Tom Shoval
-----Original Message-----
Sent: Thursday, November 27, 2003 2:05 AM
Subject: Re: [Asterisk-Users] door phone

I have a Door King model 1812 working with *. It is running on an X100P
port with fxs_ks signalling. It works very well. The visitor pushes a
button on the 1812 and the device comes off hook. I have the `s` extension
set to auto dial the attendant. After the attendant decides to let them in,
they press `9`. This is configurable.
I actually have it running over an 802.11b link to the front gate entrance.
You could probably operate it successfully on an fxo port from a channel
bank as well, that's what the installation manual actually referred to.
Walker

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

_______________________________________________
Asterisk-Users mailing list
http://lists.digium.com/mailman/listinfo/asterisk-users

James H. Thompson

2003-11-27 01:43:58 UTC

Door phone resources:

http://www.vikingelectronics.com/
Door phones, elevator phones, and other interesting telephone equipment
Their door entry systems are here:
http://www.vikingelectronics.com/products/doorentry/product_list.html

http://www.homephone.com/
home of the Doorbell Fon

http://www.sandman.com/
All kinds of strange and wonderful telephone related items
in particular for a door phone see:
http://www.sandman.com/pdf/Page21.pdf

Jim

James H. Thompson
***@lava.net

----- Original Message -----
From: "Tom Shoval" <***@softov.co.il>
To: <asterisk-***@lists.digium.com>
Sent: Wednesday, November 26, 2003 12:18 PM
Subject: RE: [Asterisk-Users] door phone

Post by Tom Shoval
a. thanks, looks great.
b. can anyone recommend a solution that costs "a little" under a 1000$ ?
-----Original Message-----
Sent: Thursday, November 27, 2003 2:05 AM
Subject: Re: [Asterisk-Users] door phone

I have a Door King model 1812 working with *. It is running on an X100P
port with fxs_ks signalling. It works very well. The visitor pushes a
button on the 1812 and the device comes off hook. I have the `s` extension
set to auto dial the attendant. After the attendant decides to let them in,
they press `9`. This is configurable.
I actually have it running over an 802.11b link to the front gate entrance.
You could probably operate it successfully on an fxo port from a channel
bank as well, that's what the installation manual actually referred to.
Walker

Post by Shoval Tomer
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while,
so any info will be great.
thanks

--
******** DataCrest, Inc. -- Technically Superior ******************
Walker Haddock http://www.datacrest.com
1634A Montgomery Hwy. phone: 1-888-941-3282, 1-205-335-8589
Birmingham, AL 35216 fax: 1-205-823-7838
***********************************************************************
_______________________________________________
Asterisk-Users mailing list
http://lists.digium.com/mailman/listinfo/asterisk-users
_______________________________________________
Asterisk-Users mailing list
http://lists.digium.com/mailman/listinfo/asterisk-users

Adam Goryachev

2003-11-27 02:50:23 UTC

Post by James H. Thompson
http://www.vikingelectronics.com/
Door phones, elevator phones, and other interesting telephone
http://www.vikingelectronics.com/products/doorentry/product_list.html

Would something like this be easily integrated into asterisk? I'm
assuming you still need some sort of power source (transformer) and a
relay switch to turn it on/off? At $AUD50 it seems pretty reasonable
from what I have seen so far. Also seems like it would work with most
locks (except my current one which has the three pins that slide into
the holes on the door frame....)

http://www1.jaycar.com.au/productView.asp?ID=LA5078&CATID=&keywords=door
+strike&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=xxxxxxxxxx&Keyword2
=xxxxxxxxxx&pageNumber=&priceMin=&priceMax=&SUBCATID=

If anyone else has suggestions for Australian suppliers of this stuff.
It seems lots of places have the intercom/doorphone parts, but not the
actual part that opens the lock....

Regards,
Adam

--
Adam Goryachev
Website Managers
Ph: +61 2 9345 4395 ***@websitemanagers.com.au
Fax: +61 2 9345 4396 www.websitemanagers.com.au

John Todd

2003-11-27 03:43:27 UTC

Post by Shoval Tomer
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:

http://www.talkaphone.com/products.cfm?prodid=168

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.

Built like tanks, designed for outdoor implementation. I _highly_
recommend this device. ADA-compliant with braille and raised letters
(must be mounted within wheelchair height to be compliant.) They can
dial a specific sequence of numbers upon button press, and they can
take inbound calls, or even auto-dial when someone is screaming at it
with the right module option. Also includes a set of relays that can
be activated via DTMF. All analog, will plug right into an FXS port.
I'm sure a clever hacker could find some NEMA-rated outdoor boxes
into which an ATA-186, WiFi device, power regulator, and battery
could be built, and a solar panel mounted on the top for a
campus-wide or for large park areas with no wiring...

To address the other point made on this thread: the DTMF sequences to
open the door are only valid coming from the "far end" of the call.

JT

Adam Goryachev

2003-11-27 05:46:29 UTC

Post by Shoval Tomer
Hi,
Anyone know anything about Asterisk's support for door phones?
Receiving the call from the door intercom system, opening the door,

etc?

Post by Shoval Tomer
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

Post by John Todd
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 ***@websitemanagers.com.au
Fax: +61 2 9345 4396 www.websitemanagers.com.au

Jon Pounder

2003-11-27 14:00:46 UTC

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.

Post by Adam Goryachev

Post by Shoval Tomer
Hi,
Anyone know anything about Asterisk's support for door phones?
Receiving the call from the door intercom system, opening the door,

etc?

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

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
Fax: +61 2 9345 4396 www.websitemanagers.com.au
_______________________________________________
Asterisk-Users mailing list
http://lists.digium.com/mailman/listinfo/asterisk-users

Richard Lyman

2003-11-27 18:12:27 UTC

who says they have a channel bank, or a zaptel card for that matter.
your $50 solution figure would then be a bit skewed, eh?

Jon Pounder

2003-11-27 18:32:13 UTC

Post by Richard Lyman
who says they have a channel bank, or a zaptel card for that matter.
your $50 solution figure would then be a bit skewed, eh?

so use a port on one of the 4port fxs cards then.

no matter what solution you use, you still need a port on the pbx to
connect to.

or pickup one of the $10 x100p clones, and another $10 for the fxo to fxs
convertor - You can hard code the caller id, not like it has to work
through that mess, since there is only one phone on the end of it.

bottom line is anyone can afford it.

Post by Richard Lyman

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Matt White

2003-11-28 05:59:49 UTC

Post by 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.)

Just as another data point, you could look at something like

http://www.x10.com/products/x10_um506.htm

It's an X10 module (powerline control system) that provides basically an
on/off switch for low-voltage devices (up to ***@24VDC). Pretty much all
you need then is the power supply and the strike. The main advantage is
that being an X10 device, you don't have to run wires all the way to
your computer room. All you need is your X10 computer interface (like
the "FireCracker PC Interface (CM17A)", which every good geek has
already, right? :-)

--
Matt White ***@arts.usask.ca
Arts and Science Computer Labs University of Saskatchewan

It sure is Monday... Ain't it a sin
I've gotta work my way thru the week again.
- Mark Chesnutt..."Sure Is Monday"

m***@netexpress.com.au

2003-11-27 05:55:37 UTC

Surely dick smiths have something

Regards Mick

-----Original Message-----
From: asterisk-users-***@lists.digium.com
[mailto:asterisk-users-***@lists.digium.com] On Behalf Of Adam
Goryachev
Sent: Thursday, 27 November 2003 4:16 PM
To: asterisk-***@lists.digium.com
Subject: RE: [Asterisk-Users] door phone

Post by Shoval Tomer
Hi,
Anyone know anything about Asterisk's support for door phones?
Receiving the call from the door intercom system, opening the door,

etc?

Post by Shoval Tomer
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

2003-11-27 06:55:36 UTC

I have this http://www.doorbellfon.com installed on fxo ports
supports 2 doors $300us for
-1 door box, 1 ctrl panel, 130
-2 Outbound Relay Trigger Controller to open standard electric locks, 100
-1xtra door box, 50

http://www.marko.net/asterisk/archives/0209/0077.html

Adam Goryachev

2003-11-27 23:28:42 UTC

Post by Adam Goryachev
So, anyone got a solution for under AUD$100 ?
Surely this is really just a bunch of cheap/commodity electronic
components?

OK, this part I understood/understand. It's "easy" and achieves a simple
intercom (but depending on where you live, might cost you a LOT if you
need to keep replacing the handset because people keep damaging it...

Perhaps a cheap (as cheap as possible) speaker phone behind some sort of
metal box with a grille where the speaker part is. Modify the 'hook'
into a button and you are all done.

Post by Jon Pounder
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.

Yes, either someone sent it to the list, or I found a AUD$50 door strike
for a 'standard' door. You say yours is interfaced to your alarm, what
happens if you don't have an alarm? This seems to be the point where I
keep getting confused.

Post by Jon Pounder
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.)

I mostly understand that up to the inverse parallel but... I did some
basic electronics stuff in school and in project kits, but never quite
got up to IC's. Could you please consider making the above into some
sort of circuit diagram/drawing?

Post by Jon Pounder
Make a simple agi script either using system command or in C - output

a 1

Post by Jon Pounder
to the bit of the parport, wait 5seconds, output a 0. Done.

This bit should be simple :)

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

Yes, Dick Smith are still around...

So, I understand that there are a few components needed for this to
work:

Asterisk running on a pc with a parallel port (or maybe serial port?)
Small electronic box described above which interfaces from the parallel
port to <???>
Door strike

So, the bit I am missing is does the <???> mean your alarm panel, or
does the electronic box connect directly to the door strike?
What about some of these door strikes which can 'monitor' the door, can
that information be passed back to asterisk? (I'm thinking turn on the
lights etc when the door is opened with a key or forced open (can the
door strike tell the difference?))

Thanks for your help. I think this should be added to the wiki perhaps?

Regards,
Adam

Jon Pounder

2003-11-28 01:41:21 UTC

Ok I guess I need to stop being lazy, and actually finish this project.

If you don't hear from me on the list about it in the next couple weeks,
bug me.

I'll complete the hardware, and take photos of it. (I have several loose
electric strikes besides the one on the front door so I can photograph
them and the electronics I build, and I will throw together some sort of
agi or system command that can be executed to activate the strike.)

By the way, not to keep you in suspense, but all inverse parallel means is
in a DC circuit the diode is installed in the direction that would
normally block current, but when the coil in the relay is de-energized,
and the magnetic field collapses this is the proper direction for the
diode to be pointed so it shunts the voltage spike across the coil and
keeps it out of the more sensitive solid state parts of the circuit.

Post by Adam Goryachev