×

Solid state rotary entry control system

  • US 4,568,927 A
  • Filed: 10/12/1982
  • Issued: 02/04/1986
  • Est. Priority Date: 10/12/1982
  • Status: Expired due to Fees
First Claim
Patent Images

1. A rotary entry control system for an appliance control that includes a microprocessor and multiplexed display means electrically connected to and controlled by said microprocessor, said display means including indicia means in the form of a segmented bar graph indicating data entered into said microprocessor, said microprocessor including a plurality of output terminals connected to said display means and being conditioned to generate signals at said output terminals controlling said display means, said rotary entry control system comprising, in combination, a power level circuit including a manually actuatable rotary potentiometer having a variable resistance means, a comparator having positive and negative inputs and an output, D to A converter means comprising a CMOS inverter and an R/2R ladder network connected to said CMOS inverter and to said negative input of said comparator, said CMOS inverter being connected to said output terminals of said microprocessor, said variable resistance means being connected to said positive input of said comparator, said microprocessor including an additional input terminal connected to said output of said comparator, and a source of D.C. potential connected to said variable resistance means.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×