[hackerspaces] Shop Access Control System

john arclight arclight at gmail.com
Fri Aug 14 20:34:49 CEST 2009

So after some more research, I think I've solved 2 more problems:

1. There is a company out of Hong Kong on eBay that has Wiegand-26 readers
and keypads at a very reasonable price.  I picked up 3 readers and about 50
tokens for around US$100 shipped.  Will let everyone know how well it works
out.  They even have a keypad+RFID+fingerprint reader for aorund US$129.

2. For the door hardware, there is a simpler way to secure it.  We got a
large electromagnet that can be fitted to the inside of the door without
much modification.  The problem with this hardware is that we could lock
ourselves out if the system glitches, and we also keep the
landlord/maintenance guy out who sometimes fixes things.

Apparently, some security installers get around this by installing a micro
switch or a mercury switch inside the door, so that turning the  key
deactivates the door holding relay.  There are commercial kits for this or
we can do DIY.  I believe this would also preserve the deadbolt in the door,
so that we can also use the key to secure it if something is broken.

Will let everyone know how it goes.  Our ultimate goal is to be able to give
out a code or key to permanent key holders, 1-day users, and even one-time
open requests.  Also, we will have a web portal and SMS notification of
alarms and a list of who is likely at the shop if we want to stop by and
hang out.


On Thu, Aug 13, 2009 at 3:11 PM, john arclight <arclight at gmail.com> wrote:

> Til,
> I agree with you on the door hardware.  Most industrial/office spaces use
> commercial mortise hardware which is not like the normal residence
> deadbolt.  One solution is the eletromagnet lock, although this requires
> about 200ma continuous power and is ahrd to override in case of failure or
> if the landlord needs to get in.
> We found a solution that does not require modification.  It re-uses the
> existing door lock cylinder, but adds a solenoid actuator.  It's designed
> for retrofit and fits in the space occupied by the old hardware, so it's
> easily removed if you move out.
> Check out:
> http://www.sdcsecurity.com/mngmoc.aspx?id=57
> It appears that these are available to work with many common brands of lock
> cylinder.
> Arclight
> On Thu, Aug 13, 2009 at 12:14 PM, Tilman Frosch <til at das-labor.org> wrote:
>> Am Donnerstag, den 13.08.2009, 13:30 -0400 schrieb Tim Krabec:
>> > I read that das-labor has a usb based entry
>> > system(https://www.das-labor.org/wiki/AnonAccess/en) they appear to be
>> > down
>> AnonAccess is to be used with i2c-capable chipcards, actually. We do not
>> use the system at our space right now, as a quality lock was the more
>> pragmatic solution. Main reason is that an electronic entry system
>> requires some modifications to the door and frame, which our lessor
>> wouldn't be too happy about. Next to that with every entry system you
>> need some solution to override it in case of emergency, which is also
>> not trivial in our current space.
>> The website should be back up soon, hopefully.
>> Til
>> _______________________________________________
>> Discuss mailing list
>> Discuss at lists.hackerspaces.org
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