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Circuit for simple fuel quantity indicator

 
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bob.verwey(at)gmail.com
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PostPosted: Fri Aug 23, 2019 1:29 am    Post subject: Circuit for simple fuel quantity indicator Reply with quote
I have conventional linear fuel sender units, 0 ohms empty and 180 ohms in the full position.
I wish to display approximate fuel status with 5 LED's, which light up as quantity increases. In the empty state a red LED will be indicating. 12v system.
Knowing you guys, this is a simple "back of a napkin sketch" for some of you!
Any ideas appreciated.

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user9253



Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
PostPosted: Fri Aug 23, 2019 3:46 am    Post subject: Re: Circuit for simple fuel quantity indicator Reply with quote
A Google search turned up these two results for homemade LED fuel gauge.
-
https://www.xjbikes.com/forums/threads/diy-led-digital-fuel-gauge.25289/
-
http://www.mez.co.uk/ms13-new.html

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user9253



Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
PostPosted: Fri Aug 23, 2019 4:32 am    Post subject: Re: Circuit for simple fuel quantity indicator Reply with quote
Radio Shack's 1980 edition of "Engineer's Notebook" by Forrest M. Mims, III has a schematic of a LED Bargraph Readout using a LM339 on page 107.
It refers to a Popular Electronics article on pages 92 - 97 of the September 1978 issue available as a PDF here:
https://americanradiohistory.com/index.htm
"American Radio History" has copies of hundreds of old books and magazines about electronics, radio and television.

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bob.verwey(at)gmail.com
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PostPosted: Fri Aug 23, 2019 5:00 am    Post subject: Circuit for simple fuel quantity indicator Reply with quote
Gee thanks Joe, really appreciate the trouble....I seem to not be that good at finding stuff on Google..
On Fri, 23 Aug 2019 at 14:38, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:

Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

Radio Shack's 1980 edition of  "Engineer's Notebook" by Forrest M. Mims, III has a schematic of a LED Bargraph Readout using a LM339 on page 107.
It refers to a Popular Electronics article on pages 92 - 97 of the September 1978 issue available as a PDF here:
https://americanradiohistory.com/index.htm
"American Radio History"  has copies of hundreds of old books and magazines about electronics, radio and television.

--------
Joe Gores




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