#include <p18f458.h>
#define MTR PORTBbits.RB1
void MSDelay(unsigned int value)
void main()
  {
  unsigned int duty
  TRISB = 0xFD
  TRISD = 0xFF
  while(1)
    {
	duty = PORTD&0x03
     duty++
     duty *= 25
     MTR = 1
     MSDelay(duty)
     MTR = 0
     MSDelay(100-duty)
    }
  }