Patent ID: 6606036
Filing Date: 2003-08-12
Classification: H01H,H03M

Abstract:
An apparatus for sensing a rotary switch handling direction of a monitor comprising:a rotary switch including a plurality of resistors serially connected between a power source terminal and a ground terminal, a plurality of fixed contacts each having a different voltage level applied thereto, and a detecting contact rotated by a user's rotary switch handling to contact a particular one of said fixed contacts, each fixed contact connected to a respective one of a plurality of nodes, each of said plurality of nodes located between a respective pair of resistors or between said power source terminal and a resistor for outputting voltage levels varied correspondingly depending on a direction of the user's rotary switch handling; and a microcomputer for storing the voltage levels output from the rotary switch and comparing the voltage levels with a previously stored voltage change/handling direction table to sense a handling direction of the rotary switch; said rotary switch outputting a different voltage level to said microcomputer depending upon which fixed contact is connected to said detecting contact, no two fixed contacts having a same voltage level but each fixed contact connected to said power source terminal through a different resistance level.