In this expression ADC is the output obtained from the potentiometer. The
converted value will be send to the LCD in order to display the corresponding
winding angle setting to the user. Potentiometer value is read and updated by
ADC systematically at an interval of 30 ms until the start button is pressed by
user. Once the start button is presses, the program will convert and set the latest
ADC value as the desired winding angle. Once the winding angle θ has been set
by the user, the designed program will calculate the corresponding motor stepping
rate in step per second. The speed of carriage motor for a given winding angle can
be expressed as