Microcontroller regulated quartz clock

• US 6,359,840 B1
• Filed: 06/01/1999
• Issued: 03/19/2002
• Est. Priority Date: 06/01/1999
• Status: Expired due to Fees

• Current Assignee: James W. Freese
• Original Assignee: James W. Freese
• Inventors: Evans, Melville B.
• Primary Examiner(s): MISKA, VIT W
• Application Number:
  US09/323,390
• Time in Patent Office: 1,022 Days
• Field of Search: 368/28, 368/76, 368/80, 368/107-109, 368/157, 368/160, 368/223, 368/228, 307/141, 307/141.4
• US Class Current: 368/80
• CPC Class Codes: G04C 17/00 Indicating the time optically by electric means G04C19/00 takes precedence; by mechanical means G04B19/00, G04B19/20
• CPC Class Codes: G04C 3/14 incorporating a stepping motor G04C3/02 - G04C3/12 take precedence generating timing pulses G04F5/00, G04G3/00; setting G04G5/00; synchronisation G04G7/00; generating commutating pulses in masterclocks G04C13/0463, G04C13/02; slave clocks actuated intermittently by electromechanical step advancing mechanisms G04C13/10; control circuits for stepping motors in general H02P8/00

Abstract

A generic clock with a mechanically driven display, a standard quartz movement and a microcontroller which is programmed to turn mechanically driven features such as clock hands and counters “on” and “off” during prescribed intervals of time. A large number of novel derivative clocks can be produced by merely re-programming the microcontroller and making simple revisions to the mechanically driven display. During each tick of the clock, a set of instructions to the microcontoller pulses a stepper motor of the clock in short intervals to further extend the life of the clock'"'"'s battery.

Claims

1. In a clock, the combination of a movement for rotating at least one hand about a center of an analog display, said movement comprising, a battery, a quartz crystal oscillator, a stepper motor, a gear train, a programmable microcontroller for processing pulses from said quartz crystal oscillator to turn “

on” and

“

off”

said stepper motor during prescribed intervals of time, said analog display having at least one pair of sectors for indicating with said hand at least one pair of activities during each revolution of said hand; and

a computer program for providing a set of instructions to said microcontroller for turning said stepper motor “

on” and

“

off”

during said prescribed intervals of time.

2. The combination set forth in claim 1 wherein said battery is of a type which performs best if current is drawn in short amounts, with sufficient time intervals between uses and said computer program further provides a duty cycle for said battery during each tick of said clock for substantially extending the life of said battery, a set of instructions to said microcontroller during each tick of said clock to pulse said stepper motor with a single shortest solid pulse which produces a reliable tick to substantially extend the life of said battery.

3. The combination set forth in claim 1 wherein said battery is a lithium battery and said set of instructions in includes instructions for substantially extending the life of said battery by pulsing said motor in a series of short pulses, said pulses comprising an initial pulse of about 3 volts for 4 milliseconds to initiate a rotation of said stepper motor, about a 3 millisecond pause to coast said stepper motor, a second pulse of about 3 volts for 1 millisecond to drive said stepper motor, about a 3 millisecond pause to coast said stepper motor, and a third pulse of about 3 volts for 1 millisecond to drive said stepper motor.

4. The combination set forth in claim 3 wherein said hand is a usual hour hand.

5. The combination set forth in claim 3 wherein said hand is a usual minute hand.

6. The combination set forth in claim 1 wherein said clock is a store clock and said display comprises a single rotatable hand and a clock dial which is divided into 4 sectors, one of said sectors corresponding to an A.M. “

open”

store activity, one of said sectors corresponding to a lunch activity, one of said sectors corresponding to a P.M. “

open”

store activity and one of said sectors corresponding to a “

closed”

store activity; and

said computer program provides a set of instructions to said microcontroller to rotate said hand one revolution per day.

7. The combination set forth in claim 6 wherein said sectors are 4 equal sectors.

8. The combination set forth in claim 1 wherein said clock is an alarm day clock and said display comprises a pair of hands comprising an alarm set hand and a time hand and a clock dial which is divided into seven days;

and said computer program provides a set of instructions to said microcontroller to execute to rotate said time hand one revolution per week.

9. The combination set forth in claim 8 wherein said instructions to said microcontroller include instructions to said clock to transmit a voice message at a prescribed time.

10. The combination set forth in claim 1 wherein said clock is a tide clock and said display comprises a rotatable hand and a clock dial which is divided into periods of a tide;

and said computer program provides a set of instructions to said microcontroller to execute to rotate said hand to signal a period of said tide.

11. The combination set forth in claim 1 wherein said clock is an office clock and said display comprises a rotatable hand and a clock dial which is comprised of one half portion which is divided into 2 week end days and one half portion which is divided into the remaining 5 week days;

and said computer program provides a set of instructions to said microcontroller to execute to rotate said hand one half revolution during said 2 day week end portion and one half revolution during said 5 week day portion.

12. The combination set forth in claim 1 wherein said clock is a seven-eleven clock and said display comprises a rotatable hand and a clock dial which is divided into 16 equal parts corresponding to the hours of 7 A.M. to 11 P.M.;

and said computer program provides a set of instructions to said microcontroller to execute to rotate said hand one complete revolution during a 16 hour interval corresponding to the hours of 7 A.M. to 11 P.M. and to stop said hand during an 8 hour interval corresponding to the hours of 11 P.M. to 7 A.M.

13. The combination set forth in claim 1 wherein said clock is a perpetual-calendar clock and said display comprises 3 rotatable hands, one of said hands being a “

day of month hand”

, another of said hands being a “

month hand”

, and another of said hands being a “

day of week hand” and

a clock dial which is divided into annular zones, an outer zone for signaling the day of month, an intermediate zone for signaling the month, and an inner zone for signaling the day of week; and

said computer program provides a set of instructions to said microcontroller to execute to rotate said “

day of month hand”

one revolution per month, said “

month hand”

one revolution per year and said “

day of week hand”

one revolution per week.

14. The combination recited in claim 13 wherein said “

day of month hand”

is a usual “

minute hand”

, said “

month hand”

is a usual “

hour hand” and

said “

day of week hand”

is a usual “

second hand”

of a standard quartz clock.

15. The combination set forth in claim 1 wherein said clock is a forever clock and said display comprises a rotatable hand and a clock dial which is divided into 60 sectors;

and said computer program provides a set of instructions to said microcontroller to execute to rotate said hand one revolution in 60 years.

16. The combination set forth in claim 2 wherein said battery is a 3 volt lithium battery.

17. The combination set forth in claim 16 wherein said lithium battery is a “

solder in”

battery.

18. The combination set forth in claim 16 wherein said lithium battery has a life of at least 10 years.

19. The combination set forth in claim 2 wherein said shortest solid pulse for producing a reliable tick in said movement is about a 3 volt pulse for about 12 milliseconds.

20. The combination set forth in claim 1 wherein said microcontroller is a PIC 12C508 microcontroller.

21. The combination set forth in claim 6 wherein said A.M. “

open”

store activity is between the hours of 8;

00 A.M. and noon, said lunch activity is between the hours of noon and 1;

00 P.M., said P.M. “

open”

store activity is between the hours of 1;

00 P.M. and 5;

00 P.M. and said store closed activity is between the hours of 5;

00 P.M. and 8;

00 A.M.

22. The combination set forth in claim 1 wherein said display is comprised of a clock dial and a pair of hands.

23. In a clock of the type having a battery, a quartz crystal oscillator, a countdown divider, a stepper motor, a gear train, an analog display and at least one hand driven by said gear train, the improvement comprising a programmable microcontroller for processing pulses from said quartz crystal oscillator to rotate and stop said hand during prescribed intervals of time for indicating with said hand at least one pair of activities during each revolution of said hand, and a computer program for providing a set of instructions to said microcontroller for rotating and stopping said hand during said prescribed intervals of time to indicate the occurrences of said pair of activities during each revolution of said hand.

24. In a clock of the type having a lithium battery, a quartz crystal oscillator for generating a 32768 Hz train of pulses, a countdown divider operatively connected to said crystal oscillator for reducing said 32768 frequency of said train of pulses to a 1 Hz. frequency, a stepper motor operatively connected to said countdown divider for driving a gear train, a gear train operatively connected to said stepper motor, and a mechanically driven hand operatively connected to said gear train, the improvement comprising:

a programmable microcontroller operatively connected to said crystal oscillator, said countdown divider and said stepper motor; and

a computer program for providing a set of instructions to said microcontroller to execute for providing a life of said battery of at least 10 years and indicating the occurrence of at least one pair of activities during each revolution by pulsing said stepper motor during prescribed intervals of time.

25. The improvement set forth in claim 24 wherein said computer program further includes a set of instructions for pulsing said stepper motor during each tick of said clock in a set of short intervals to extend the life of said battery.

26. The improvement set forth in claim 24 further comprising an alphanumeric display and a further set of instructions in said computer program for displaying messages on said alphanumeric display.