NTC.h

#ifndef NTC_h
#define NTC_h
#include <Arduino.h>
 
//Define a abstract class NTC_Sensor
//this class handles the R2T transformation
//readResistance has to be implemented
class NTC_Sensor {
protected:
    float ntc_type; //e.g. 3.0 for 3k or 5.0 for 5k....
public:
    NTC_Sensor(float nt);
    float R2T(float t);
    virtual float readResistance(void)=0;
    float getTemp(void);
};
 
class NTC_Calc: public NTC_Sensor {
public:
    NTC_Calc(float nt):NTC_Sensor(nt){}
    float readResistance(void);
};
 
 
//NTC sensor directly connnected to Arduino ADC
class NTC_ADC: public NTC_Sensor {
private:
    uint8_t power_pin;
    uint8_t adc_pin;
    float pre_resistor;
public:
    NTC_ADC(uint8_t pp, uint8_t ap, float pr, float nt);
    float readResistance(void);
};
 
//NTC sensor read out with MCP342x 18bit ADC
#include <MCP342x.h>
class NTC_MCP342x: public NTC_Sensor {
private:
 
    uint8_t power_pin;
    uint8_t adc_ch_r;
    uint8_t adc_ch_ntc;
    float pre_resistor;
    MCP342x* mcp;
 
public:
    NTC_MCP342x(MCP342x &m, uint8_t pp, uint8_t ch_r, uint8_t ch_n, float pr, float nt);
    float readResistance(void);
    uint8_t sleep_count;
 
};
 
//NTC sensor read out with HX711 24bit ADC Channel B
#include <HX711Array.h>
class NTC_HX711: public NTC_Sensor {
private:
 
    uint8_t power_pin;
    float pre_resistor;
    HX711Array* hx711;
    uint8_t number;
 
public:
    NTC_HX711(HX711Array &hx, uint8_t pp, float pr, float nt, uint8_t n=0 );
    NTC_HX711(HX711Array &hx, float pr, float nt, uint8_t n=0 );
    float readResistance(void);
    //Note: getTemp(nr) does not run a ADC conversion
    //call readResistance before!
    float getTemp(uint8_t nr);
 
};
 
 
 
#endif