[sudoroom] electronic access

[Susan Werner]

What's generally used in these cases is what's called an electric strike:
(see http://en.wikipedia.org/wiki/Electric_strike or 
http://www.accesshardware.com/press/AHS%20HES%20CompleteGuide.pdf )

An electric strike is a device that is installed in the doorframe that frees
the bolt (and thus the door) to move even when the bolt is extended. 

Another option is to replace the entire panic bar is replaced with a panic bar 
with an internal delocking mechanism that can retract its bolt when power is 
applied. 

What should *not* be done is any modification of the panic bar -- doing so is 
likely to violate fire codes / life safety codes. In most building codes, there
are strict requirements about what's allowed (and not) on doors with panic bars
and from what I understand, modifying the panic bar is likely to cause a code
violation. (an electric strike doesn't interfere with any of the functioning of 
a panic bar, so those are OK)

Once you have a something that unlocks when power is applied, all you need to 
do is interface that with a 3.3V / 5V logic output (relay + transistor with the
right protection diodes is an easy way to go) and connect that to a computer. 

-- 
Susan

On Nov 18 19:08, Andrew <andrew at roshambomedia.com> wrote:
> Hi Susan,
> 
> Last I heard we were going to get an estimate from a door guy and then see
> if we could do it our selves for cheaper. The problem we have is that the
> outside facing door is one of those push bar doors. We aren't sure how to
> approach replacing the lock with an rfid or card reader. Do you have any
> experience with that?
> 
> Thanks,
> Andrew
> 
> 
> On Sun, Nov 18, 2012 at 6:41 PM, Susan Werner <heinousbutch at gmail.com>wrote:
> 
> > What's the status on the access things? I'm interested in helping out --
> > I've
> > already built very similar things (electric strike + magnetic card reader
> > interfaced with a WR850G wireless router running openwrt (i interfaced the
> > e-strike to the GPIO pins and the magnetic card reader to its serial port).
> >
> > I also have a working beaglebone running linux (it's a small ARM board
> > with a
> > hellton of GPIO pins, a handful of serial ports, USB, and ethernet) and I'm
> > willing to use it for the door access control.
> >
> > --
> > Susan
> >
> > On Nov 18 16:57, Andrew <andrew at roshambomedia.com> wrote:
> > > All updates on the access issues. I tried to get in today, but no one was
> > > there or heard the buzzer.
> > >
> > > --Andrew
> > >
> > >
> > > On Tue, Nov 13, 2012 at 12:48 PM, Jenny Ryan <jenny at thepyre.org> wrote:
> > >
> > > > There is a meta-organizational meetup at 6pm before the meeting
> > tomorrow.
> > > >
> > > > Jenny
> > > > http://jennyryan.net
> > > > http://thepyre.org
> > > > http://thevirtualcampfire.org
> > > > http://technomadic.tumblr.com
> > > >
> > > > `~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
> > > >  "Technology is the campfire around which we tell our stories."
> > > > -Laurie Anderson
> > > >
> > > > "Storytelling reveals meaning without committing the error of defining
> > it."
> > > >  -Hannah Arendt
> > > >
> > > > "To define is to kill. To suggest is to create."
> > > > -Stéphane Mallarmé
> > > > ~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
> > > >
> > > >
> > > >
> > > > On Tue, Nov 13, 2012 at 12:32 PM, Andrew <andrew at roshambomedia.com>
> > wrote:
> > > >
> > > >> Sounds great. I'll be there.
> > > >>
> > > >>
> > > >> On Mon, Nov 12, 2012 at 11:06 PM, Jonoakland <
> > > >> bayopensourcehardware at gmail.com> wrote:
> > > >>
> > > >>> I'm willing and able to help with the construction side of the
> > > >>> electronic access system I propose anyone interested in the
> > electronic
> > > >>> access project meets before the meeting for brainstorming 6 o'clock
> > > >>> Wednesday and then after the meeting also...
> > > >>>
> > > >>> _______________________________________________
> > > >>> sudoroom mailing list
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> > > >>> http://lists.hackerspaces.org/mailman/listinfo/sudoroom
> > > >>>
> > > >>>
> > > >>
> > > >>
> > > >> --
> > > >> -------
> > > >> Andrew Lowe
> > > >> Cell: 831-332-2507
> > > >> http://roshambomedia.com <http://roshambomediacom>
> > > >>
> > > >>
> > > >>
> > > >> _______________________________________________
> > > >> sudoroom mailing list
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> > > >>
> > > >>
> > > >
> > >
> > >
> > > --
> > > -------
> > > Andrew Lowe
> > > Cell: 831-332-2507
> > > http://roshambomedia.com
> >
> > > _______________________________________________
> > > sudoroom mailing list
> > > sudoroom at lists.hackerspaces.org
> > > http://lists.hackerspaces.org/mailman/listinfo/sudoroom
> >
> >
> > --
> >
> >
> >
> 
> 
> -- 
> -------
> Andrew Lowe
> Cell: 831-332-2507
> http://roshambomedia.com

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