温控单片机输出PWM信号,求大神解解惑

ID:515073 · 发表于 2019-5-26 18:08

想用温度传感器反馈一个pwm信号控制电机转速(程序如下)，程序在34.5之前输出电压在2V以下，在34.5之后输出为12v，小白搞不定他，有没有大神解解惑，万分感谢。
单片机源程序:
#include "reg52.h"
#include"temp.h"
#include<intrins.h>
typedef unsigned int u16;
typedef unsigned char u8;
sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;
sbit beep=P1^5;
sbit PWM1=P1^1;//
sbit PWM2=P1^2;
sbit ENA=P1^3;
char num=0;
uchar time=0;
uchar ting; uchar zou;
u8 DisplayData[8];
u8 code smgduan[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
u8 start1=0;
u8 start2=0;
int flag=0;

void delay(u16 i)
{       while(i--);       }

void sound1()
{       u8 i=100;
      while(i--)
{    beep=~beep;
delay(10);
}
start1=0;
beep=1;
}

void sound2()
{       u8 i=100;
while(i--)
{       beep=~beep;
      delay(100);
}
start2=0;
beep=1;       }

void datapros(int temp)
{          float tp;
if(temp< 0)
{       DisplayData[0] = 0x40;          //
   temp=temp-1;
      temp=~temp;
   tp=temp;
   temp=tp*0.0625*100+0.5;
}
else
{       DisplayData[0] = 0x00;
      tp=temp;
      temp=tp*0.0625*100+0.5;             }
   DisplayData[1] = smgduan[temp / 10000];
   DisplayData[2] = smgduan[temp % 10000 / 1000];
   DisplayData[3] = smgduan[temp % 1000 / 100] | 0x80;
   DisplayData[4] = smgduan[temp % 100 / 10];
   DisplayData[5] = smgduan[temp % 10];}void

baojing(int temp)
{  float
mmp,tempH,tempL,tempM1,tmp,tempM2,tempM3,tempM4,tempM5,tempM6,tempM7,tempM8;
tempH=35;
tempM1=31;
tempM2=31.5;
tempM3=32;
tempM4=32.5;
tempM5=33;
tempM6=33.5;
tempM7=34;
tempM8=34.5;
tempL=28;
mmp=(float)temp;
tmp=(mmp*0.0625*100+0.5)/100;             if(tmp>=tempH)
      {       start2=1;
               ting=100;       }
else if(tmp<=tempL)
   {          start1=1;
         ting=95;
      }
else if (tmp>=tempM8)
{                start1=1;
               ting=89;
}
else if (tmp>=tempM7)
{                start1=1;
ting=87;
}
else if (tmp>=tempM6)
{                start1=1;
            ting=85;
}
else if (tmp>=tempM5)
{                start1=1;
            ting=83;
}
else if (tmp>=tempM4)
{                start1=1;
            ting=80;
}
else if (tmp>=tempM3)
{                start1=1;
               ting=78;
}
else if (tmp>=tempM2)
{       start1=1;
      ting=75;
}
else if (tmp>=tempM1)
{                start1=1;
            ting=70;
}
else
{             beep=1;
      ting=65;
}}

void DigDisplay()
{       u8 i;       for(i=0;i<6;i++)
{             switch(i)                      {                      case(0):             LSA=0;LSB=0;LSC=0; break;                      case(1):             LSA=1;LSB=0;LSC=0; break;                      case(2):             LSA=0;LSB=1;LSC=0; break;                      case(3):             LSA=1;LSB=1;LSC=0; break;                      case(4):             LSA=0;LSB=0;LSC=1; break;                      case(5):             LSA=1;LSB=0;LSC=1; break;             }
P0=DisplayData[5-i];
delay(10);
P0=0x00;       }
}
void Timer0Init()
{       TMOD=0x01;
   TH0=0xff;
      TL0=0xf7;
      EA=1;
      ET0=1;
   TR0=1;}

void main()
{       ting=40;
      Timer0Init();
while(1)       {
   if(start1==1)
{       sound1();
}
else if(start2==1)
{
sound2();       }
else             {       beep=1;
}                         }
}

void tim0() interrupt 1
{       if(flag==0)
{
datapros(Ds18b20ReadTemp());                DigDisplay();
baojing(Ds18b20ReadTemp());                      flag=1;
  }
TR0=0;
TH0=0xff;
TL0=0xf7;
TR0=1;
time++;
  if(time>=100)
{datapros(Ds18b20ReadTemp());                   DigDisplay();
baojing(Ds18b20ReadTemp());                         time=0;             }

if(time<=ting)
  {       PWM1=1;
      PWM2=0;
//  ENA=1; }
else
{       PWM1=0;
      PWM2=0;
//  ENA=0; }
  }

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