My interconnected smoke alarm isn't a kiddie ( I can't remember the brand),= but it works backwards from the kiddie. 9V pulse during smoke alarm and constant 9V duri= ng CO alarm and a &%$* 1 second long 5V pulse every 5 minutes when the back up battery need= s to be changed (All 10 of the smoke detectors in my house start chirping at once).=20 The 9V pulse has the same width as the warble coming from the smoke detecto= r - I suspect they are tied together.=20 Cris Wilson Computer Support College of AAH Clemson University 864-656-6081 -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of= Bob Blick Sent: Thursday, April 24, 2014 1:00 AM To: Microcontroller discussion list - Public. Subject: Re: [EE] Interconnected smoke detectors Thank you! Bob On Wed, Apr 23, 2014, at 07:34 PM, Kevin Fonda wrote: > Take a look at the beginning of page 2 of this pdf. Looks like it's a=20 > 9vdc constant signal for smoke. >=20 > http://www.detectorsandalarms.com/images/pdf/kidde_bulletin1.pdf >=20 >=20 > On Wed, Apr 23, 2014 at 7:56 PM, Bob Blick wrote: >=20 > > Does anyone know what the red wire on interconnected smoke detectors=20 > > does when the alarm sounds? I know I could buy an interface box but=20 > > that would be just plain wrong :) > > > > These are USA standard home smoke detectors with black and white=20 > > wires for 120 VAC and a red wire for interconnection. > > > > Thanks, Bob -- http://www.fastmail.fm - Choose from over 50 domains or use your own -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .