Diff: Thermistor.h

Revision:

1:8766173d267f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Thermistor.h	Mon Oct 19 22:03:12 2015 +0000
@@ -0,0 +1,88 @@
+#ifndef Thermistor_H
+#define Thermistor_H
+
+#include "mbed.h"
+#include <math.h>
+/**
+* Reads the resistance of thermistor and using Steinhart–Hart equation 
+* converts it to Celsius
+* 
+*/
+class Thermistor{  
+public:
+    /**
+    * Constructor. In the calculations used  a model of 
+    * the resistance of a semiconductor at different temperatures - 
+    * The Steinhart–Hart equation. Need to set the coefficients a, b, c.
+    *
+    * @param inputChanel The analog input is connected to the sensor
+    * @param a Steinhart–Hart coefficient
+    * @param b Steinhart–Hart coefficient
+    * @param c Steinhart–Hart coefficient
+    */
+    Thermistor(AnalogIn inputChanel, double a, double b, double c);
+    
+    /**
+    * The temperature in degrees Celsius
+    * @returns Temperature
+    */
+    double getTemperature();
+    
+    /**
+    * Set error value used in the calculation. 
+    * The resulting resistance is computed as <real resistance> - error;
+    * @param error Error in Ohms
+    */    
+    void setError(double error);
+    
+    /**
+    * Error value used in the calculation
+    * The resulting resistance is computed as <real resistance> - error;
+    * @returns Error in Ohms
+    */
+    double getError();
+    
+    /**
+    * Set a coefficient of Steinhart–Hart equation
+    * @param a a-coefficient 
+    */
+    void setCoefficientA(double a);
+
+    /**
+    * Set b coefficient of Steinhart–Hart equation
+    * @param b b-coefficient 
+    */    
+    void setCoefficientB(double b);
+
+    /**
+    * Set c coefficient of Steinhart–Hart equation
+    * @param c c-coefficient 
+    */    
+    void setCoefficientC(double c);
+    
+    /**
+    * a coefficient of Steinhart–Hart equation
+    * @returns a coefficient 
+    */
+    double getCoefficientA();
+    
+    /**
+    * b coefficient of Steinhart–Hart equation
+    * @returns b coefficient 
+    */
+    double getCoefficientB();
+    
+    /**
+    * c coefficient of Steinhart–Hart equation
+    * @returns c coefficient 
+    */    
+    double getCoefficientC();
+    
+private:
+    AnalogIn input;
+    //Thermistor error in Ohms
+    double error;
+    double a, b, c;
+};
+
+#endif
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