In that project a microcontroller nxp lpc845 arm cortex m0 is driving 8 stepper motors one clock uses two motors each individually controlled.
Wall clock stepper motor.
The stepper motor 28byi 48 is driven by a small controller board uln2003.
For those familiar with arduino programming and shields you can find help programming stepper motors here.
A small oled display is also used to show the date and time on the control box.
The 28byj48 produces 32 steps per full motor revolution.
The only changes necessary in the stepper motor control files is to change the delay time in the loop function.
Finally 6 push buttons can be used to adjust the rtc and run the mechanical clock fast forward or fast reverse.
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Stepping motor is 2 phase ac generator.
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Using a serial connection the clock can be configured.
To adjust the timekeeping you might have to tweak the delay time a little according to the motor variability.
Although the stepper claimed to have a 1 64 reduction gear the actual ratio wasn t that precise.
Its output shaft is geared to yield 512 or 513 depending on source steps per revolution.
Include hands quartz diy wall clock movement mechanism battery operated diy repair parts replacement.
My clock uses two 28byj48 steppers to turn its minute and hour hands.
For the time being ignore the section of the schematic labeled ir circuitry.
Clock component running by stepping motor.
You can drive a clock with a stepping motor prank to somebody.
For the minute motor start with a delay of about 1800 and for the hour motor use a delay of about 21600.