[Noisebridge-discuss] Timer to turn off the buzzer

Ray waywardengineer at gmail.com
Fri Feb 10 20:51:22 UTC 2012

How I did the arduino-RTC interface on the Boxshop alarm system was
pretty easy: I got a programmable digital timer meant to turn a light
or whatever at the set time. I then just connected a relay with a 110V
coil, and on the other end of the relay is a 5V signal that goes into
the Arduino. Sort of the opposite of how you'd use a normal relay.
It's universal for any of those timers and has worked troublefree for
years now!

On Thu, Feb 9, 2012 at 4:55 PM, tedward <arbzed at gmail.com> wrote:
> On Thu, Feb 9, 2012 at 3:20 PM, jim <jim at well.com> wrote:
>> -1   ; how to make this happen? the nightly human
>>     ; or some erlang program on pony? or...?
>>     ; neither seems trustworthy, but i'm open
>>     ; to any ideas.
> erlang?  NOOOOOO!
> There are lots of possible solutions that would not require server uptime or
> network access.
> A technically simple solution would be a hacked appliance timer.
> Another solution would be an Arduino coupled to a latching relay and an
> accurate time source.  I mention that because  I need to learn how to
> interface an arduino with an RTC for a different project I'm working on
> anyway, so I'd be willing to implement that one if there is some support for
> the concept and no one who hates it enough to disconnect it as soon as it's
> set up.
> --t.
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