Method and apparatus for accurately reading a potentiometer

Details Method and apparatus for accurately reading a potentiometer Method and apparatus for accurately reading a potentiometer

2006-02-14

2006-02-14

Wu, Xiao (Department: 2674)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

C345S156000

Reexamination Certificate

active

06999063

ABSTRACT:
A method for reading a position of a wiper on a potentiometer, comprising the steps of (A) charging a capacitor connected to a wiper terminal of the potentiometer, (B) discharging the capacitor through a particular terminal of the potentiometer, (C) measuring a first time taken to discharge the capacitor from a first voltage to a second voltage, (D) recharging the capacitor, (E) discharging the capacitor through another particular terminal of the potentiometer, (F) measuring a second time taken to discharge the capacitor from the first voltage to the second voltage, (G) reading the position of the wiper by calculating a ratio of the times measured in steps (C) and (F).

REFERENCES:
patent: 4563676 (1986-01-01), Leininger
patent: 4987372 (1991-01-01), Ofori-Tenkorang et al.
patent: 6078311 (2000-06-01), Pelkey
patent: 6175359 (2001-01-01), Marten
patent: 6429850 (2002-08-01), Marten
patent: 6577297 (2003-06-01), Wright

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