Apparatus for digitizing the setting of a potentiometer

Details Apparatus for digitizing the setting of a potentiometer Apparatus for digitizing the setting of a potentiometer

1990-09-11

1993-09-21

Harrell, Robert B.

Boots, shoes, and leggings

3649219, 3642608, 3642645, 364264, 364DIG1, G06F 944

Patent

active

052476804

ABSTRACT:
A circuit including an adjusting control (e.g. a potentiometer) which has two end connections and a slider which is adjustable for setting different resistance ratios. The two end connections of the potentiometer are each connected to one of two connections of a microprocessor and the slider is connected to one connection of a capacitor. The other capacitor connection is connected to a predetermined potential. To each of the two microprocessor connections at least one controllable switch is connected for optionally connecting a first potential (V1) or a second potential (V2) to the relevant microprocessor connection. The microprocessor executes a program run in which the capacitor, which has previously been brought into an initial charge state, is recharged first via one resistance section (R1) and then via the other resistance section (R2) of the potentiometer. In each case a measurement value Z(Z2), Z(Z3) corresponding to a capacitor recharging period (TU1, TU2) is determined and from the determined measurement values Z(Z2), Z(Z3) a digital data word signal (SQ) is generated by forming the quotient thereof. This digital signal represents the resistance ratio set by the slider of the potentiometer.

REFERENCES:
patent: 4157699 (1979-06-01), Mori
patent: 4574226 (1986-03-01), Binder
patent: 4777483 (1988-10-01), Fowler
patent: 4907562 (1990-03-01), Johansson

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