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標題: 用PWM調(diào)速制作一個電風扇 [打印本頁]

作者: wts123 時間: 2015-10-29 12:24
標題: 用PWM調(diào)速制作一個電風扇
#include<reg51.h>
#define  uint unsigned int
#define  uchar  unsigned char
sbit dianji01=P0^0;
sbit dianji02=P0^1;
sbit  s1=P1^1;
sbit  s2=P1^4;
uint flag;
uint pwm=16;
void delay(uint i)
{
   uchar j;
   while(i--)
   for(j=0;j<120;j++);

}
void init()
{
   ET1=1;
   EA=1;
   TH1=0XFE;
   TL1=0X00;
   TR1=1;
}
void keyscan()
{
   if(s1==0)
   {
   delay(50);
   if(s1==0)
   {

if(pwm<32)
{
pwm++;

}
}
}
   if(s2==0)
   {
   delay(50);
   if(s2==0)
   {
if(pwm>1)
{
pwm--;

}
}
}
   if(pwm>flag)
{
   dianji01=1;
}
else
   {
dianji01=0;
}
}
void main()
{
  init();
while(1)
{
   keyscan();
   delay(100);
}
}
void interrupr() interrupt 3
{
   TR1=0;
   TH1=0XFE;
   TL1=0X00;
   TR1=1;
   flag++;
   if(flag>32)
   {
   flag=0;
}

}

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