kazunori ogasawara / NTCThermistor

NTC Thermistor class.

Dependents:   FermenterTempArray

Fork of Thermistor by kazunori ogasawara

NTCThermistor.cpp@3:e9f38dc974f8, 2014-09-09 (annotated)

Committer:
macht
Date:
Tue Sep 09 02:53:49 2014 +0000
Revision:
3:e9f38dc974f8
Parent:
2:b052ac698148 
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macht 2:b052ac698148 1 #include "NTCThermistor.h"
macht 2:b052ac698148 2
macht 2:b052ac698148 3 /** Create a NTCThermistor instance
macht 2:b052ac698148 4 *@param T0 basic temperature[degrees/celsious]
macht 2:b052ac698148 5 *@param R0 basic resistance[ohm]. Thermistor takes this resistance at basic temperature T0.
macht 2:b052ac698148 6 *@param B B-parameter.
macht 2:b052ac698148 7 */
macht 2:b052ac698148 8 NTCThermistor::NTCThermistor(float T0,float R0,float B){
macht 2:b052ac698148 9 T0_ = T0;
macht 2:b052ac698148 10 K0_ = T0_+273.0;
macht 2:b052ac698148 11 R0_ = R0;
macht 2:b052ac698148 12 B_ = B;
macht 2:b052ac698148 13 }
macht 2:b052ac698148 14
macht 2:b052ac698148 15 /** Transfer temperature from resistance
macht 2:b052ac698148 16 */
macht 2:b052ac698148 17 float NTCThermistor::trans_R2T(float R){
macht 2:b052ac698148 18 float K = (B_*K0_)/(K0_*log(R/R0_)+B_);
macht 2:b052ac698148 19 float temp = K-273.0;
macht 2:b052ac698148 20 return temp;
macht 2:b052ac698148 21 }