[Noisebridge-discuss] Electric door strike working again. Use your Pin or key to get in.

[Henner Zeller]

On 14 July 2013 18:23, Jake <jake at spaz.org> wrote:

> the reason the motor i chose was so flimsy was because i wanted to make
> sure it was easy enough to turn when off, so that it would not hold the
> latch open.
>

I know, but from the feel of it (my unscientific manual gauging determined
about 1lb pull :)), we can't get around of actually having a geared motor
...


> I will probably replace it with a different motor, and a large capacitor
> and relay, so that when it is energized from the intercom it will open the
> lock (while charging the capacitor).
>

... so this solution sounds like the right one. We need a geared motor -
and if we can't change the AC supply, then we need to do the capacitor
thing.

 Scotty found a motor that looks promising; Since  I was about to leave, I
took it home to play with it a bit and add an end-switch. Will bring it on
Tuesday to the meeting.


> when power from the intercom stops, the relay will release and drain the
> capacitor into the motor in the other direction, so the motor will undo.


One question: do we actually have to stick to the 12V AC scheme ? What is
preventing us to ignore the AC supply and use 'our' power on the line; a
couple of volts DC to open and reverse current to close ?
I assume, we need to make it work with the other tenants (do we ?), but
that shouldn't be to big of a deal.
If this is not working, and the capacitor solution might not work out (too
big capacitor needed ?) we could have a little power supply downstairs that
can take care of things.
Hope you're there on Tuesday, so that we can hack on it. Scotty attempts to
make it as well (he is the guy who recently added tests to
noisebridge-baron).

-h


>
> -jake
>
>
> On Sun, 14 Jul 2013, Henner Zeller wrote:
>
>  tl;dr : the electric door strike is replaced, so the door is secured
>> again.
>> Don't jam the door in as you might got used to in the last couple of days.
>> We don't want to break the new lock :) If someone has access to a working
>> printer and stickers, maybe add a sticker to the lock so that people know
>> and don't slam it.
>>
>> Longer version: I went to Discount Builders and got a new electric door
>> strike. It is similarly cheap and flimsy as the one we already had, so we
>> should continue on the solution Jake already started, which looks long
>> term
>> promising.
>>
>> I looked at Jake's solution today, and the motor is not strong enough for
>> what it should do. So I got the new strike so that we have a working door
>> in
>> the meantime. I met Scotty in the hallway and we chatted about some ideas
>> to
>> continue improving the gate situation.
>>
>> -henner
>>
>>
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