实用51单片机控制直流马达程序（含电风扇4档调速程序）

#include <AT89X51.H> #define Key P1_1 #define motor P3_2 unsigned char code tab[5]={0xc0,0xf9,0xa4,0xb0,0x99}; //数码管编码 unsigned char code set[4]={0,3,6,9}; //PWM　占空比90%，60%，30% unsigned char code zy[9]={2,4,6,8,9,8,6,4,2}; //自然风 unsigned char tt=0; //档位 unsigned char jj=0; void delay( unsigned int ms); void main( void) { bit kk=0; //按键 motor = 0; TMOD = 0x01; //定时器T0，工作方式1 TH0 = -1000/256; TL0 = -1000%256; //定时1ms ET0 = 1; EA = 1; TR0 = 1; while(1) { P2 = tab[tt] ; Key =1; if( Key == 0) { delay(10); Key =1; if(Key == 0 && kk ==0) { tt++; if(tt>4) tt=0; P2 = tab[tt] ; kk =1; } } Key = 1; if( Key == 1) kk= 0; } } void IT( void ) interrupt 1 { static unsigned char i = 0; TH0 = -1000/256; TL0 = -1000%256; //定时1ms if(tt<4) {if( i < set[tt] ) motor =1; else motor = 0; i++; if(i>=10) i=0;} else if(tt=4) { static unsigned char j = 0; if(j<zy[jj]) motor=1; else motor=0; j++; if (j>=30) { j=0; jj++;} if(jj>9) jj=0; } } void delay( unsigned int ms) //延时 { unsigned char i; while( ms--) { for( i=0 ; i<125 ; i++); } }