Circuit and method for determining the physical position of a va

Details Circuit and method for determining the physical position of a va Circuit and method for determining the physical position of a va

1995-04-27

1996-10-08

Tokar, Michael

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324677, 324678, G01R 3126

Patent

active

055635199

ABSTRACT:
A circuit and method is disclosed which determines the physical position of a selected resistance setting of a mechanical variable resistive component, such as a potentiometer, between its mechanical limits as a ratio of its selected resistance and its total resistance. The circuit includes a potentiometer, a capacitor and a microprocessor, which form a charging circuit. The microprocessor has three I/O pins, which are connected to the three terminals of the pot. The capacitor is connected in series to the pot, so that it can be charged by a voltage signal from the microprocessor either across the selected resistance of the pot's wiper or across the entire resistance of the pot. The microprocessor executes a program, which embodies the method of this invention. The program executed by the microprocessor enables the microprocessor to separately measure the time required to charge the capacitor to a predetermined threshold voltage first across the selected resistance and across the entire resistance of the device and then to generate the ratio of the two time intervals.

REFERENCES:
Microchip Technology, Inc. Embedded Control Handbook (1994) pp. 2-65 to 2-69.

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