[tech] Serial Port Games: Smoke Detectors.

[James Bromberger]

On Mon, Apr 30, 2001 at 04:26:15PM +0800, Mark Tearle wrote:
> Of course, if it's the actual computer that you are using to page you
> that's caught on fire then ....

Granted.

> Have you investigated doing the job properly and having a proper fire alarm
> system fitted?

Where's the fun in that? ;)

OK, yes, a proper file alarm will ring the fire brigade, yes. But regardless 
of other systems, I also want to know ASAP.


                             +------- DTR
                             \
                             /
                             \  r2
                             /
                             |
                             +-------- DTC
                    r1       |
   ---<siren>-----/\/\/----(<)  d1
   -                         |
   .			     +-------- GND  


r2 about 10 ohms. r1 enough to drop the differential between siren and GND to 
just on 0 mA. Optionally, between siren and r1, place a one way diode. In 
parrallel, splice in betwene the one way diode and r1 yet another smoke 
detector. Is this right? You can then have multiple alarms, and any one 
triggered will raise the alarm. What about overloading when multiple 
alarms signal? *shrug* 

-- 
 James Bromberger <james_AT_rcpt.to> www.rcpt.to/~james

       * *  C u in Bordeaux - 1st Debian Conference, July 2001 * * 
 Remainder moved to http://www.rcpt.to/~james/james/sig.html
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