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Date:         Tue, 25 May 2010 11:06:25 -0700
Reply-To:     Richard Koerner <rjkinpb@SBCGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Richard Koerner <rjkinpb@SBCGLOBAL.NET>
Subject:      Re: Warning Lights Audible Buzzer
In-Reply-To:  <AANLkTinPmPkQdvtgRzNnOeeJ1J4oU7BCh5ZCcUGFlk4z@mail.gmail.com>
Content-Type: text/plain; charset=iso-8859-1

Excellent idea, John!  If prototypes work, could actually turn this into a product...what would people be willing to spend for this "insurance" to save a major engine event from happening....$25 or so?  Maybe list vendors would be interested, too.  Maybe patentable, too, do "real" cars,...er...modern ones, have such an audible alert?  They should!

Rich 85 Vanagon San Diego

--- On Tue, 5/25/10, John Bange <jbange@GMAIL.COM> wrote:

From: John Bange <jbange@GMAIL.COM> Subject: Re: Warning Lights Audible Buzzer To: vanagon@GERRY.VANAGON.COM Date: Tuesday, May 25, 2010, 10:47 AM

> it would drive me nuts to have the alarm every time I put the key in the > ignition and got the momentary red lights...so needs to have a "reasonable" > delay of 10 seconds or so, so that only alarms when there is real trouble > while running.  Like a broken belt. > > Come on you Electrical Engineers!  Couple IC's and discretes, some > perfboard, some wires.....  (ignorant Mechanical Engineer speaking). >

Better than a delay would be to monitor the tachometer pulse and only fire the buzzer if there's tach activity and there's no voltage on the alternator sense wire. 25 cent microcontroller and a half dozen miscellaneous parts, and it'd attach to the dash cluster with three wires. Add a couple more and you could monitor oil and water as well.

I actually have the project on my list... right after I finish the idle controller...

-- John Bange


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