#include "math.h"
const float Rp=10000.0; //10K
const float T2 = (273.15+25.0); //T2
const float Bx = 3950.0; //B
const float Ka = 273.15;
float temp;
while(1)
{
temp = 1/(log(Rt/Rp)/Bx + (1/T2));
temp = (temp - Ka + 0.5)*10;
LCD_ShowxNum(86,150,temp,5,16,0x80); //显示温度
}
将各步拆分如下：
float Get_Temp(void)
{
float Rt;
float temp;
Rt = Get_TempResistor(); //获得电阻值
//like this R=5000, T2=273.15+25,B=3470, RT=5000*EXP(3470*(1/T1-1/(273.15+25)),
temp = Rt/Rp;
temp = log(temp); //ln(Rt/Rp)
temp/=Bx; //ln(Rt/Rp)/B
temp+=(1/T2); //ln(Rt/Rp)/B+（1/T2）
temp = 1/(temp);
temp-=Ka;
temp+=0.5; //加0.5误差矫正
return temp;
}
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