Appliance mode indentification encoding

Details Appliance mode indentification encoding Appliance mode indentification encoding

1991-12-26

1994-09-20

Peng, John K.

Communications: electrical

Continuously variable indicating

With meter reading

34082522, 341 26, 364189, G05B 1902, H03M 1100

Patent

active

053493443

ABSTRACT:
A microprocesser-based controller for an appliance such as a microwave oven is able to control a number of different models having different cooking characteristics. The user-operable keypanel is unique to each model, and a scanned matrix keyboard on the keypanel is encoded in a manner consistent with conventional scanned matrix keyboard techniques to identify to the controller the particular model. A scanned matrix keyboard includes a set of drive lines and a set of sense lines intersecting the drive lines. In one embodiment disclosed herein, one or more sense lines are added that are uniquely connected to the existing drive lines depending on the particular model being encoded. The added sense lines are read to determine the model. In another embodiment, one or more drive lines are added, similarly connected to existing sense lines depending on the particular model being encoded.

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patent: 5107088 (1992-04-01), Aoki

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