mikrokontrollersystemer-prosjekt/prosjekt.X/thermistor-temp.c

#include "themistor-temp.h"


float calculate_thermistor_temp(float readValue){
    float R_therm;
    float V_1;
    float ln; 
    float T_therm;
    float V_therm;
    uint8_t V_tot = 5;
    // Calculate Voltage over thermistor
    V_therm = (V_tot/1024)*readValue;
    
    // Voltage accross R_1
    V_1 = V_tot - V_therm; 
    
    // Calculate Thermistor resistanse
    R_therm = (V_therm)/ (V_1 / R_1);
    
    // Steinhart-Harts formula
    ln = log(R_therm/R_t0);
    T_therm = (1/ ((ln/B) + (1/T_0)));
    
    // Temperatur in celcius
    T_therm -= 273.15;
    
    return T_therm;
}