งาน ปฏิบัติ 16

Code
#include <Stepper.h>
#include "Keypad.h"
#define STEP_ANGLE_4STEP 32 //360/11.25 degree
#define STEP_OUT_WITH_GEAR 2048 //32*64
Stepper stepper(STEP_ANGLE_4STEP,8,10,9,11);
char keys[4][4]={
  {'7','8','9','A'},
  {'4','5','6','B'},
  {'1','2','3','C'},
  {'*','0','#','D'}};
byte rowPins[] = {7,6,5,4};
byte colPins[] = {3,2,1,0};
int speedmotor = 400;
int dirmotor = 1;
Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,4,4);
void setup()
{
}
void loop()
{
  char key = keypad.getKey();
  if (key != NO_KEY)
  {
        if (key == '1')
            speedmotor = 400;
        if (key == '2')
            speedmotor = 700;
        if (key == '3')
            speedmotor = 1000;
        if (key == 'A')
            dirmotor = 1;
        if (key == 'B')
            dirmotor = -1;   
        if (key == 'C')
            dirmotor = 0;
  }
  stepper.setSpeed(speedmotor);
  stepper.step(dirmotor);
}