Return-Path: Received: from [206.46.252.42] (HELO vms042pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 752865 for flyrotary@lancaironline.net; Mon, 21 Feb 2005 13:11:49 -0500 Received: from verizon.net ([4.12.145.173]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IC9005MMX7FMRZ0@vms042.mailsrvcs.net> for flyrotary@lancaironline.net; Mon, 21 Feb 2005 12:11:40 -0600 (CST) Date: Mon, 21 Feb 2005 13:11:39 -0500 From: Finn Lassen Subject: Re: [FlyRotary] Re: Digital Fuel Monitoring System In-reply-to: To: Rotary motors in aircraft Message-id: <421A245B.9090808@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------030106000806080801060404 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------030106000806080801060404 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Depends on the input resistance of your ADC, that becomes part of the lower leg of your voltage divider. Finn Bob Kuc wrote: >I have also been toying about building a "black Box" to monitor things. Besides the fuel level monitor, outside temp, data from EMC2 and such. I can program it but building the components is the challenging stuff and that is why it interests me. As i feed the airplane voltage into my application, I divide the current by 1/3 so that I can feed my microchip ADC. In my prototype, I have been using 1M resistors to do the division. Does it matter on the size? My thinking is, since I only want to voltage, the higher the better. > >Bob K > > > > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html >>> >>> > > > --------------030106000806080801060404 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Depends on the input resistance of your ADC, that becomes part of the lower leg of your voltage divider.

Finn

Bob Kuc wrote:

I have also been toying about building a "black Box" to monitor things.  Besides the fuel level monitor, outside temp, data from EMC2 and such.  I can program it but building the components is the challenging stuff and that is why it interests me.  As i feed the airplane voltage into my application, I divide the current by 1/3 so that I can feed my microchip ADC.  In my prototype, I have been using 1M resistors to do the division.  Does it matter on the size?  My thinking is, since I only want to voltage, the higher the better.

Bob K

 Homepage:  http://www.flyrotary.com/
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