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Fluid-level Sensing using Capacitance

Developed For: InsCap
Key Technologies:
Microprocessor: MSP430F2111
Communications: serial

The Problem: 
Create firmware that would determine the level of fluid in a gasoline tank by monitoring the change in capacitance of multiple "sensing pads".

The Solution: 
CoAutomation created code for the MSP430 using the unique capabilities of the Comparator to transfer charge from one capacitor to another and to measure change by triggering a TimerA capture. Fluid sensing accuracy increased by using a multi-segmented capacitor and a proprietary technique for incresing the accuracy of the individual segments. Device establishes level of fluid and then transmits data over serial connection. Debug mode allows device to send data supporting level calculations.

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