正接时正转,反接时反转

 

IN为低电平时,三极管导通 

IN为高电平时,三极管断开 

P10口如果给1,就为0

 主循环写法

while(1)
{for(Time=0;Time<100;Time++){for(i=0;i<20;i++){LED=0;Delay(Time);//亮的时间LED=1;Delay(100-Time);//暗的时间}}
}

#include <REGX52.H>
sbit LED=P2^0;
void Delay(unsigned int t)
{while(t--);
}
void main()
{unsigned char Time,i;while(1){for(Time=0;Time<100;Time++){for(i=0;i<20;i++){LED=0;Delay(Time);//亮的时间LED=1;Delay(100-Time);//暗的时间}}}
}

电机调速:

 新思路：

Counter%=100;//相当于if(Counter>=100){Counter=0;}

#include <REGX52.H>sbit LED=P2^0;
unsigned char Counter,Compare;//计数器,比较
void Timer_Init()
{TMOD=0x01;TL0=0x9c;//100usTH0=0xff;TR0=1;ET0=1;EA=1;
}
void main()
{Timer_Init();Compare=1;while(1){}
}
void Timer0_Routine() interrupt 1
{TL0=0x9c;//100usTH0=0xff;Counter++;Counter%=100;//相当于if(Counter>=100){Counter=0;}if(Counter<Compare){LED=0;}else{LED=1;}
}

按键控制电机：

#include <REGX52.H>
sbit LED=P2^0;
sbit Motor=P1^0;
void Delay(unsigned int xms)
{unsigned char i, j;while(xms--){i = 2;j = 239;do{while (--j);} while (--i);}
}
unsigned char Key(){unsigned char KeyNumber=0;if(P3_1==0){Delay(20);while(P3_1==0);Delay(20);KeyNumber=1;}if(P3_0==0){Delay(20);while(P3_0==0);Delay(20);KeyNumber=2;}if(P3_2==0){Delay(20);while(P3_2==0);Delay(20);KeyNumber=3;}if(P3_3==0){Delay(20);while(P3_3==0);Delay(20);KeyNumber=4;}return KeyNumber; 
}
unsigned char Counter,Compare;//计数器,比较
unsigned char KeyNum,Speed;
void Timer_Init()
{TMOD=0x01;TL0=0x9c;//100usTH0=0xff;TR0=1;ET0=1;EA=1;
}
void main()
{Timer_Init();while(1){KeyNum=Key();if(KeyNum==1){Speed++;Speed%=4;if(Speed==0){Compare=0;}if(Speed==1){Compare=5;}if(Speed==2){Compare=50;}if(Speed==3){Compare=100;}}}
}
void Timer0_Routine() interrupt 1
{if(KeyNum==1){P2_3=0;}TL0=0x9c;//100usTH0=0xff;Counter++;Counter%=100;//相当于if(Counter>=100){Counter=0;}if(Counter<Compare){Motor=1;}else{Motor=0;}
}