[Noisebridge-discuss] door to gate intercom

[Nicholas Granado]

woohoo!


On Thu, Jan 24, 2013 at 3:37 PM, Jake <jake at spaz.org> wrote:

> last night I made a two-way audio intercom to go between the upstairs door
> area and the gate downstairs.
>
> yes, technically there was already an intercom but it was a low audio
> quality useless piece of crap, and one direction wasn't working at all.
>
> the new intercom uses apple plaintalk microphones which are high-quality
> condenser microphones with a built-in preamp.  They send line-level audio
> through a cat5 cable in both directions.
>
> there is a microphone and speaker mounted at the gate (i didn't witness
> the installation but the wiring was done when i left for BART) and a blue
> cat5 cable runs from the gate to the camera monitor by the upstairs door.
> At the monitor there is another microphone and speaker, and it's all
> powered by the 12v from the monitor.
>
> The amplifier which boosts the microphone's line-level outputs to speaker
> level is part of the monitor, and one channel is used for each direction.
>
> There is a volume knob on the left side of the monitor, toward the top. If
> the volume is turned up too far, there will be feedback.
>
> If you notice a problem such as the wire is dangling into the door hinge,
> or the speaker needs to be zip-tied into place, or the speaker and
> microphone are too close to one another, or anything else, please do
> something about it and/or let me and/or the list know.
>
> i hope everyone enjoys the ability to communicate clearly between the gate
> and the upstairs door.  Once this system is working well enough, we can
> disable the doorbell and replace it with a sign that says "to get in,
> please announce your request to the microphone so that you can be heard
> upstairs."
>
> -jake
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