[Rack] doorport - do you know how the door opener works?

Jake jake at spaz.org
Tue Dec 6 02:21:07 PST 2011

There is no need for an ethernet-powered arduino or another pc, because 
now the door is connected to a usb parallel port on minotaur.

I promise there will be no complications or electrical nasties related to 
the long wires.

please put any info or code you have on the wiki page so it's more easy to 
collaborate on this thing.  Also miloh says to ask you for access to 
stallion or minotaur or whatever.  i think i'm already on pony.  I want 
someone to test stuff.


On Tue, 6 Dec 2011, Jonathan Lassoff wrote:

> I'm a bit familiar with the situation with the hardware, and AFAIK Miloh and
> Mike Kan have also worked on the hardware. I've been playing with various
> ideas for software for opening the door lately and have a little C daemon
> for x86/BIOS PCs as well as an Arduino sketch that implement a simple
> UDP-based protocol to see if anyone has been ringing the door recently and
> to buzz open the gate.
> SuperQ is in the process of getting an Arduino that can be powered by
> 802.3af -over-Ethernet. My hope is that once this hardware is in-hand, we
> can mount it by the door and run some Ethernet from the closet there to the
> stair-top door to power it.
> Thanks for hooking the door up to Minotaur! That's a much more stable
> machine than the one in the touchpanel by the door. I'll see about getting
> the daemon running on there to test with.
> I wonder what's on the other side of the wire though (within the buzzer
> panel or intercom/buzzer controller). I wonder if our hacked-in extension of
> the wire causes impedance mismatches, high-current paths, or other
> electrical nasties that might interfere with its proper operation.
> Cheers,
> jof
> On Tue, Dec 6, 2011 at 1:47 AM, Jake <jake at spaz.org> wrote:
>       Who knows how the door opener script works?  The door opener
>       circuitboard
>       is now effectively plugged into Minotaur, the computer screwed
>       to the wall
>       over the "server room" door.  Make it work somehow.
>       https://www.noisebridge.net/wiki/Doorport
>       This page is here to store information about the parallel port /
>       door
>       opener thingy that allows noisebridgers to open the door from a
>       computer.
>       jake (spaz) made a 30 foot (approximately) cable which has a
>       female
>       centronics-36 socket (like on an old printer) on one end, and a
>       female
>       DB-25 socket on the other end. It is a cat5 wire which has eight
>       conductors, and is passing through two ground wires (to pins 19
>       and 20 on
>       the DB25) and three each of input and output pins. These include
>       pins 6
>       and 7 (bits 4 and 5 of the parallel data byte), and pin 16 (an
>       output pin
>       which is pin 31 on the centronics connector). The three input
>       pins are 10,
>       12 and 13 (none of which are inverted in the implementation).
>       Pins 6 and
>       10 are the only ones wired up right now on the little
>       optoisolator board
>       (along with ground on pin 20).
>       This is plugged into a USB parallel port cable (made for using
>       old
>       printers) which is plugged into Minotaur, the computer screwed
>       to the wall
>       over the "server room" door.
>       the other end is in the dirty shop and is plugged into the
>       little
>       circuitboard with optoisolators on it, which is for opening the
>       door. That
>       board also has a male PS2 keyboard connector for 5v power, but
>       that should
>       be changed to connect to pin 7 of the DB25 port for power. The
>       software
>       will have to make sure to always turn pin 7 to logical 1, so
>       that power is
>       available to the little board for whatever that does.. probably
>       a pull-up
>       for a signal coming into the parallel port.
>       If you know anything about that little board and what it does
>       (or is
>       supposed to do) please put that information here. Also please
>       put the C
>       program or whatever it is that talks to the parallel port and
>       opens the
>       door.
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>       Rack at lists.noisebridge.net
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