Digital Fuel Gauge

Posted on Sep 12, 2012

This circuit uses a digital voltmeter (formed from IC1 and IC3) to display fuel quantity as a percentage of a full tank.

Digital Fuel Gauge
Click here to download the full size of the above Circuit.

In order to work with two lands of fuel sensors, low resistance = full. Where higher resistance = full, IC2 forms a dc amplifier that has both inverting (path A) or noninverting (path B) outputs, and calibration adjustments for each path.

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