STC8A8K64S4A12单片机用10K的NTC温度传感电阻测温串口发送的实验程序 -

#include "stc8.h"
#include "uart.h"
#include "adc.h"
#include <stdio.h>
#include <math.h>
const float Rp=10000.0; //10K，25度时的阻值
const float T2 = (273.15+25.0); //T2，25度时的开尔文温度
const float Bx = 3950.0; //B值
const float Ka = 273.15; //开尔文温度
float Get_Temp(float Rt)
{
float temp;
//like this R=10000, T2=273.15+25,B=3470, RT=10000*EXP(3470*(1/temp-1/(273.15+25)),
// temp = Rt/Rp;
// temp = log(temp); //ln(Rt/Rp)
// temp/=Bx; //ln(Rt/Rp)/B
//temp+=(1/T2);
// temp = 1/(temp);
// temp-=Ka;
temp=1/(log(Rt/Rp)/Bx+(1/T2))-Ka;
return temp;
}
void printstar(void)
{
printf("*************************\n");
}
void print_message(void)
{
printf("hello world\n");
printf("how do you do!\n");
printf("欢迎学习STC8A8K单片机\n");
}
void main(void)
{
float t,r,vol;
P1M0=0X00;P1M1=0XFF;
Uart1_Init() ;
adc_init();
while(1)
{
if(P20==0)
{
print_message();
printstar();
vol=((float)adc_read()/4096)*5;
r=vol/((5-vol)/10000);
t=Get_Temp(r);
printf("ADC %.2f", t) ;
}
}
}

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