步进电机控制代码：

c
#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar code FFW[] =
{
 0x01, 0x03, 0x02, 0x06, 0x04, 0x0c, 0x08, 0x09
};
uchar code REV[] =
{
 0x09, 0x08, 0x0c, 0x04, 0x06, 0x02, 0x03, 0x01
};
sbit K1 = P3 ^ 0;
sbit K2 = P3 ^ 1;
sbit K3 = P3 ^ 2;
void DelayMS( uint ms )
{
 uchar i;
 while ( ms-- )
 {
  for ( i = 0; i < 120; i++ )
   ;
 }
}
void SETP_MOTOR_FFW( uchar n )
{
 uchar i, j;
 for ( i = 0; i < 5 * n; i++ )
 {
  for ( j = 0; j < 8; j++ )
  {
   if ( K3 == 0 )
    break;
   P1 = FFW[j];
   DelayMS( 25 );
  }
 }
}
void SETP_MOTOR_REV( uchar n )
{
 uchar i, j;
 for ( i = 0; i < 5 * n; i++ )
 {
  for ( j = 0; j < 8; j++ )
  {
   if ( K3 == 0 )
    break;
   P1 = REV[j];
   DelayMS( 25 );
  }
 }
}
void main()
{
 uchar N = 3;
 while ( 1 )
 {
  if ( K1 == 0 )
  {
   P0 = 0xfe;
   SETP_MOTOR_FFW( N );
   if ( K3 == 0 )
    break;
  }else if ( K2 == 0 )
  {
   P0 = 0xfd;
   SETP_MOTOR_REV( N );
   if ( K3 == 0 )
    break;
  }else  {
   P0 = 0xfb;
   P1 = 0x03;
  }
 }
}

效果：

直流电机：

c
#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
sbit K1 = P3 ^ 0;
sbit K2 = P3 ^ 1;
sbit K3 = P3 ^ 2;
sbit LED1 = P0 ^ 0;
sbit LED2 = P0 ^ 1;
sbit LED3 = P0 ^ 2;
sbit MA = P1 ^ 0;
sbit MB = P1 ^ 1;
void main( void )
{
 LED1 = 1;
 LED2 = 1;
 LED3 = 0;
 while ( 1 )
 {
  if ( K1 == 0 )
  {
   while ( K1 == 0 )
    ;
   LED1 = 0;
   LED2 = 1;
   LED3 = 1;
   MA = 0;
   MB = 1;
  }
  if ( K2 == 0 )
  {
   while ( K1 == 0 )
    ;
   LED1 = 1;
   LED2 = 0;
   LED3 = 1;
   MA = 1;
   MB = 0;
  }
  if ( K3 == 0 )
  {
   while ( K1 == 0 )
    ;
   LED1 = 1;
   LED2 = 1;
   LED3 = 0;
   MA = 0;
   MB = 0;
  }
 }
}