Chris Bravo Valente

US Patent:

6495821, Dec 17, 2002

Filed:

Feb 16, 2000

Appl. No.:

09/505321

Inventors:

Dane Smith - Green Valley AZ
Chris M. Valente - Elmhurst IL
Martin Rathgeber - Chicago IL
Mark D. Siegler - Brookfield IL

Assignee:

The Chamberlain Group, Inc. - Elmhurst IL

International Classification:

G01D 534

US Classification:

25023114, 25023118, 341 13

Abstract:

A movable barrier operator includes an absolute position detector which provides a unique value for each position of the barrier along its path of travel. The absolute position detector employs multiple binary serial streams and one multiple clock stream. After the first five cycles of the clock stream, the binary streams can be decoded by a processor to produce an absolute position. Every clock edge produces a new absolute position along the path of travel.