Konstantin Chayka / Mbed 2 deprecated WeatherStation

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Dependencies:   RF24 USBDevice mbed

Thermistor.h@1:8766173d267f, 2015-10-19 (annotated)

Committer:
pro100kot14
Date:
Mon Oct 19 22:03:12 2015 +0000
Revision:
1:8766173d267f
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Who changed what in which revision?

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pro100kot14 1:8766173d267f 1 #ifndef Thermistor_H
pro100kot14 1:8766173d267f 2 #define Thermistor_H
pro100kot14 1:8766173d267f 3
pro100kot14 1:8766173d267f 4 #include "mbed.h"
pro100kot14 1:8766173d267f 5 #include <math.h>
pro100kot14 1:8766173d267f 6 /**
pro100kot14 1:8766173d267f 7 * Reads the resistance of thermistor and using Steinhart–Hart equation
pro100kot14 1:8766173d267f 8 * converts it to Celsius
pro100kot14 1:8766173d267f 9 *
pro100kot14 1:8766173d267f 10 */
pro100kot14 1:8766173d267f 11 class Thermistor{
pro100kot14 1:8766173d267f 12 public:
pro100kot14 1:8766173d267f 13 /**
pro100kot14 1:8766173d267f 14 * Constructor. In the calculations used a model of
pro100kot14 1:8766173d267f 15 * the resistance of a semiconductor at different temperatures -
pro100kot14 1:8766173d267f 16 * The Steinhart–Hart equation. Need to set the coefficients a, b, c.
pro100kot14 1:8766173d267f 17 *
pro100kot14 1:8766173d267f 18 * @param inputChanel The analog input is connected to the sensor
pro100kot14 1:8766173d267f 19 * @param a Steinhart–Hart coefficient
pro100kot14 1:8766173d267f 20 * @param b Steinhart–Hart coefficient
pro100kot14 1:8766173d267f 21 * @param c Steinhart–Hart coefficient
pro100kot14 1:8766173d267f 22 */
pro100kot14 1:8766173d267f 23 Thermistor(AnalogIn inputChanel, double a, double b, double c);
pro100kot14 1:8766173d267f 24
pro100kot14 1:8766173d267f 25 /**
pro100kot14 1:8766173d267f 26 * The temperature in degrees Celsius
pro100kot14 1:8766173d267f 27 * @returns Temperature
pro100kot14 1:8766173d267f 28 */
pro100kot14 1:8766173d267f 29 double getTemperature();
pro100kot14 1:8766173d267f 30
pro100kot14 1:8766173d267f 31 /**
pro100kot14 1:8766173d267f 32 * Set error value used in the calculation.
pro100kot14 1:8766173d267f 33 * The resulting resistance is computed as <real resistance> - error;
pro100kot14 1:8766173d267f 34 * @param error Error in Ohms
pro100kot14 1:8766173d267f 35 */
pro100kot14 1:8766173d267f 36 void setError(double error);
pro100kot14 1:8766173d267f 37
pro100kot14 1:8766173d267f 38 /**
pro100kot14 1:8766173d267f 39 * Error value used in the calculation
pro100kot14 1:8766173d267f 40 * The resulting resistance is computed as <real resistance> - error;
pro100kot14 1:8766173d267f 41 * @returns Error in Ohms
pro100kot14 1:8766173d267f 42 */
pro100kot14 1:8766173d267f 43 double getError();
pro100kot14 1:8766173d267f 44
pro100kot14 1:8766173d267f 45 /**
pro100kot14 1:8766173d267f 46 * Set a coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 47 * @param a a-coefficient
pro100kot14 1:8766173d267f 48 */
pro100kot14 1:8766173d267f 49 void setCoefficientA(double a);
pro100kot14 1:8766173d267f 50
pro100kot14 1:8766173d267f 51 /**
pro100kot14 1:8766173d267f 52 * Set b coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 53 * @param b b-coefficient
pro100kot14 1:8766173d267f 54 */
pro100kot14 1:8766173d267f 55 void setCoefficientB(double b);
pro100kot14 1:8766173d267f 56
pro100kot14 1:8766173d267f 57 /**
pro100kot14 1:8766173d267f 58 * Set c coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 59 * @param c c-coefficient
pro100kot14 1:8766173d267f 60 */
pro100kot14 1:8766173d267f 61 void setCoefficientC(double c);
pro100kot14 1:8766173d267f 62
pro100kot14 1:8766173d267f 63 /**
pro100kot14 1:8766173d267f 64 * a coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 65 * @returns a coefficient
pro100kot14 1:8766173d267f 66 */
pro100kot14 1:8766173d267f 67 double getCoefficientA();
pro100kot14 1:8766173d267f 68
pro100kot14 1:8766173d267f 69 /**
pro100kot14 1:8766173d267f 70 * b coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 71 * @returns b coefficient
pro100kot14 1:8766173d267f 72 */
pro100kot14 1:8766173d267f 73 double getCoefficientB();
pro100kot14 1:8766173d267f 74
pro100kot14 1:8766173d267f 75 /**
pro100kot14 1:8766173d267f 76 * c coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 77 * @returns c coefficient
pro100kot14 1:8766173d267f 78 */
pro100kot14 1:8766173d267f 79 double getCoefficientC();
pro100kot14 1:8766173d267f 80
pro100kot14 1:8766173d267f 81 private:
pro100kot14 1:8766173d267f 82 AnalogIn input;
pro100kot14 1:8766173d267f 83 //Thermistor error in Ohms
pro100kot14 1:8766173d267f 84 double error;
pro100kot14 1:8766173d267f 85 double a, b, c;
pro100kot14 1:8766173d267f 86 };
pro100kot14 1:8766173d267f 87
pro100kot14 1:8766173d267f 88 #endif