NTC热敏电阻测温C程序设计

#include <stdio.h>
#include <math.h>typedef struct
{double          sys_vol;     /* System Voltage */double          pudo_res;    /* Pull-down resistor */unsigned int    ntc_res;     /* Thermistor nominal resistance value */unsigned int    hex_x;       /* The ADC resolution -12Bit_4096 10Bit_1025 8Bit_256 */unsigned int    b_x;         /* B value of thermistor */
}ntc_val_t;void ntc_init(ntc_val_t *val,double sys_vol,double pudo_res,unsigned int ntc_res,unsigned int hex_x,unsigned int b_x)
{val->sys_vol=sys_vol;val->pudo_res=pudo_res;val->ntc_res=ntc_res;val->hex_x=hex_x;val->b_x=b_x;
}/*** This function converts the ADC value to a temperature value.* Rt=R*EXP(B*(1/T1-1/T2))** @param NTC initializes the structure.* @param ADC values** @return NTC temperature*/
double algorithm_ntc(ntc_val_t *val,unsigned int adc_val)
{double v_x;    /* Measured voltage value */double rt_x;   /* Measure the resistance */double temp_x; /* Measure the temperature */v_x = val->sys_vol - ((double)adc_val / val->hex_x * val->sys_vol);rt_x = (val->pudo_res * v_x) / (val->sys_vol - v_x);printf("NTC阻值：%.2fKΩ\n",rt_x);temp_x = ( 1 / (log(rt_x / val->ntc_res) / val->b_x + (1 / 298.15) ) ) - 273.15;return temp_x;
}int main(void) {ntc_val_t val;double temp_adc;unsigned int adc_value=494;ntc_init(&val,3.3,15,100,4096,3950);temp_adc=algorithm_ntc(&val,adc_value);printf("温度：%.2f℃\n",temp_adc);return 0;
}