main()
{
auto float Tc, //temperature celcius
Tk, //calculated temperature kelvins
Tkstd, //standard temperature kelvins
Tf, //temperature farenheit
Bt, //given thermistor beta // B=(-alpha*T^2) ???
Rs, //given series resistor
Rtstd, //given thermistor resistance at standard temperature
Draw, //raw data value
Gain, //gain
Dmax; //max raw data value
brdInit();
//assign variables as float values for calculation
Tc = 25.0; //standard temp in Celcius
Tkstd = Tc + 273.15; //convert to Kelvins
Bt = 3965.0; //thermistor beta
Rs = 1000.0; //series resistor
Rtstd = 3000.0; //standard temp resistance
Dmax = 2047.0; //max value on ADS7870
Gain = 1.0; //actual gain multiplier
while(1)
{
//first-time call of this function will take 1 second to charge up cap
//use single-ended and gain of 1
do {
sDelay(1);
Draw = anaIn(7, SINGLE, GAIN_1);
} while(Draw == 0);
//calculate temperature in kelvins
Tk = (Bt * Tkstd) /
(Tkstd * (log(fabs((-Draw * Rs) /
(Rtstd * (Draw - (Dmax * Gain)))))) + Bt);
Tc = Tk - 273.15; //convert to celcius
Tf = 1.8*(Tk - 255.37); //calculate fahrenheit
printf("Temperature at %.2f C (%.2f F) from data %d\n", Tc, Tf,(int)Draw);
}
}
/*
* Long delay
*/
void lDelay(void) {
unsigned char i;
for (i = 0; i < 100; i++) {
sDelay();
}
}
