zinnet yazıcı / Mbed OS BMA220

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thermistor/thermistor.cpp@1:dc9389ccc09d, 2019-09-11 (annotated)

Committer:
zinnetyazicii53
Date:
Wed Sep 11 12:15:15 2019 +0000
Revision:
1:dc9389ccc09d
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zinnetyazicii53 1:dc9389ccc09d 1 #include "mbed.h"
zinnetyazicii53 1:dc9389ccc09d 2 #include "thermistor.h"
zinnetyazicii53 1:dc9389ccc09d 3
zinnetyazicii53 1:dc9389ccc09d 4 Thermistor::Thermistor(AnalogIn *aIn)
zinnetyazicii53 1:dc9389ccc09d 5 {
zinnetyazicii53 1:dc9389ccc09d 6 _aIn = aIn;
zinnetyazicii53 1:dc9389ccc09d 7 }
zinnetyazicii53 1:dc9389ccc09d 8
zinnetyazicii53 1:dc9389ccc09d 9 double Thermistor::getTemperature()
zinnetyazicii53 1:dc9389ccc09d 10 {
zinnetyazicii53 1:dc9389ccc09d 11 this->getResistance();
zinnetyazicii53 1:dc9389ccc09d 12 if(this->_resistance > RES_25C){
zinnetyazicii53 1:dc9389ccc09d 13 this->_temperature = (25.0 - ((this->_resistance - RES_25C) / RES_DIFF_PER_C));
zinnetyazicii53 1:dc9389ccc09d 14 } else if(this->_resistance < RES_25C){
zinnetyazicii53 1:dc9389ccc09d 15 this->_temperature = (25.0 + ((RES_25C - this->_resistance) / RES_DIFF_PER_C));
zinnetyazicii53 1:dc9389ccc09d 16 } else {
zinnetyazicii53 1:dc9389ccc09d 17 this->_temperature = 25.0;
zinnetyazicii53 1:dc9389ccc09d 18 }
zinnetyazicii53 1:dc9389ccc09d 19 printf("resistance : %f\n", _resistance);
zinnetyazicii53 1:dc9389ccc09d 20 return this->_temperature;
zinnetyazicii53 1:dc9389ccc09d 21 }
zinnetyazicii53 1:dc9389ccc09d 22
zinnetyazicii53 1:dc9389ccc09d 23 void Thermistor::getResistance()
zinnetyazicii53 1:dc9389ccc09d 24 {
zinnetyazicii53 1:dc9389ccc09d 25 double sum = 0.0;
zinnetyazicii53 1:dc9389ccc09d 26 uint16_t adc_data[SAMPLE_COUNT], average;
zinnetyazicii53 1:dc9389ccc09d 27 int i = 0;
zinnetyazicii53 1:dc9389ccc09d 28 while(i < SAMPLE_COUNT) {
zinnetyazicii53 1:dc9389ccc09d 29 adc_data[i] = ((_aIn->read_u16() >> 4) & 0x0FFF);
zinnetyazicii53 1:dc9389ccc09d 30 sum += adc_data[i++];
zinnetyazicii53 1:dc9389ccc09d 31 }
zinnetyazicii53 1:dc9389ccc09d 32 average = sum / SAMPLE_COUNT;
zinnetyazicii53 1:dc9389ccc09d 33 this->_resistance = (((BALANCE_RES_S * 0x0FFF) / average)) - BALANCE_RES_S;
zinnetyazicii53 1:dc9389ccc09d 34 }