51單片機(jī)直流電機(jī)調(diào)速程序,1KHz的PWM波

ID:442877 · 發(fā)表于 2018-12-9 21:09

直流電機(jī)調(diào)速，占空比可調(diào)。小白第一次發(fā)帖

電路原理圖如下：

單片機(jī)源程序如下:

#include "reg51.h"
#include "led.h"
#include "delay.h"
uint d=100; //占空比
uint b=65436; //初值計(jì)時(shí)100us
bit flag=0;
void timer0(void) interrupt 1 //中斷部分代碼，見(jiàn)下文的釋疑
{
if(flag)
{
TH0 = b/256; //900
TL0 = b%256;
flag = 0;
P2_4 = 0;
b=65536-d;
}
else
{
TH0 = b/256; //100
TL0 = b%256;
flag = 1;
P2_4 = 1;
b=64536+d;
}
}
void main()
{
TMOD = 0x01; //TMOD的值表示定時(shí)器工作方式選擇
TH0 = b/256; //寫(xiě)入初始值,初始值可以決定定時(shí)多久
TL0 = b%256;
TF0 = 0; //計(jì)數(shù)到時(shí)TF0為1,即當(dāng)TH0 = 0xff;TL0 = 0xff；再運(yùn)行一步TF0 = 1;
TR0 = 1; //開(kāi)始計(jì)數(shù),從這時(shí)起，每運(yùn)行一步TH0和TL0都會(huì)增加，直到TH0 = 0xff;TL0 = 0xff；
ET0 = 1; //允許定時(shí)器0中斷
EA=1; //開(kāi)總中斷
while(1)
{
if(P3!=0xff) //按鍵對(duì)應(yīng)占空比調(diào)整
{
TR0 = 0;
delay_ms(10);
if((P3_4==0)&&(d>=100))
{
d=d-100; //10倍程可調(diào)減
}
if((P3_5==0)&&(d>=10))
{
d=d-10; //1倍程可調(diào)減
}
if(P3_6==0)
{
d=d+10; //1倍程可調(diào)加
}
if(P3_7==0)
{
d=d+100; //10倍程可調(diào)加
}
while(P3!=0xff);
TR0 = 1;
}
if(d<=10) //設(shè)置占空比最大最小值
{
d=10;
}
if(d>=990)
{
d=990;
}
delay_ms(2);
show_led_one(0,(d%100)/10); //實(shí)時(shí)顯示占空比
delay_ms(2);
show_led_one(1,d/100);
}
}