ds18b20显示温度控制直流电机转速有点问题各位大侠帮忙看看

longwu911

1楼-- · 2020-02-04 10:32

精彩回答 2 元偷偷看……

zywh

2楼-- · 2020-02-04 10:52

你先学习18b20的，再学习电机的控制，综合一下，最后再学习pid

312578957

3楼-- · 2020-02-04 15:05

我换了个号，那个号怎么不能发了

这个是程序
#include<reg52.h>
unsigned char led[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x0};
unsigned char code dispbit[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdF,0xbF,0x7F};
sbit DQ=P3^7;
sbit PWM=P1^1;
sbit k1=P3^0;
sbit k2=P3^1;
unsigned int tvalue,timer,a;
unsigned char a1,a2,a3,a4;
float temp;
void delay(unsigned char i)
{
   unsigned char x,y;
   for(x=0;x<i;x++)
     for(y=0;y<120;y++);
}
/**********ds18b20*********/
void delay_18b20(unsigned int i)
{
while(i--);
}
void ds18b20init()
{
DQ=1;
delay_18b20(4);
DQ=0;
delay_18b20(100);
DQ=1;
delay_18b20(40);
}
unsigned char ds1820read()//读数据
{
unsigned char i=0;
unsigned char dat=0;
for(i=8;i>0;i--)
{
DQ=0;
dat>>=1;
DQ=1;
if(DQ)
dat|=0x80;
delay_18b20(10);
}
return(dat);
}
void ds1820write(unsigned dat)
{
unsigned char i=0;
for(i=8;i>0;i--)
{
DQ=0;
DQ=dat&0x01;
delay_18b20(10);
DQ=1;
dat>>=1;
}
}
unsigned int read_temp()
{
unsigned char a,b;
ds18b20init();
ds1820write(0xcc); //跳过读序列号
ds1820write(0x44); //启动温度转换

ds18b20init();
ds1820write(0xcc);
ds1820write(0xbe); //读温度

a=ds1820read();
b=ds1820read();

tvalue=b;
tvalue<<=8;
tvalue=tvalue|a;

tvalue=tvalue*(0.625);
return(tvalue);

}
void display()
{
P2=dispbit[4];
P0=led[a1];
delay(13);

P2=dispbit[5];
P0=led[a2];
delay(13);

P2=dispbit[6];
P0=led[a3]|0x80;
delay(13);

P2=dispbit[7];
P0=led[a4];
delay(2);

}
void num()
{
a1=tvalue/1000;
a2=tvalue%1000/100;
a3=tvalue%100/10;
a4=tvalue%10;

if(a1==0)
{
a1=10;
if(a2==0)
a2=10;
}
}
/**********直流电机********/
void system_Init()
{
   TMOD=0x01;
TH0=(65536-15000)/256;
TL0=(65536-15000)%256;
EA=1;
ET0=1;
TR0=1;
}
void main ()
{
system_Init();
a=0;
while(1)
{
   read_temp();
   temp=tvalue;
   num();
   display();
   if(temp>=250&&temp<=260) a=4;
   if(temp>=260&&temp<=270) a=6;
   if(temp>=270&&temp<=280) a=8;
   if(temp>=280)  a=10;
   if(temp<=250)  a=0;


}
}
void timer0() interrupt 1
{
TH0=(65536-15000)/256;
TL0=(65536-15000)%256;
timer++;
if(timer>10)timer=0;
if(timer<a) PWM=0;
else PWM=1;
}