Konstantin Chayka / Mbed 2 deprecated WeatherStation

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Dependencies:   RF24 USBDevice mbed

Sensors/Thermistor.h@6:db4538895ae7, 2015-12-05 (annotated)

Committer:
pro100kot14
Date:
Sat Dec 05 16:57:30 2015 +0000
Revision:
6:db4538895ae7
Parent:
4:7cd67d988145 
Added unit testing. Test results are displayed on the device LEDs.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
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 6:db4538895ae7 32 * The temperature in degrees Celsius, calculated based on a parameter.
pro100kot14 6:db4538895ae7 33 * Сomfortably for testing.
pro100kot14 6:db4538895ae7 34 *
pro100kot14 6:db4538895ae7 35 * @param adcVal ADC value on the port to which the sensor is connected
pro100kot14 6:db4538895ae7 36 * @param a Steinhart–Hart coefficient
pro100kot14 6:db4538895ae7 37 * @param b Steinhart–Hart coefficient
pro100kot14 6:db4538895ae7 38 * @param c Steinhart–Hart coefficient
pro100kot14 6:db4538895ae7 39 * @param error Error in Ohms (0 by default)
pro100kot14 6:db4538895ae7 40 *
pro100kot14 6:db4538895ae7 41 * @returns Temperature
pro100kot14 6:db4538895ae7 42 */
pro100kot14 6:db4538895ae7 43 static double getTemperatureByAdcValue(float adcVal, double a, double b, double c, double error = 0);
pro100kot14 6:db4538895ae7 44
pro100kot14 6:db4538895ae7 45 /**
pro100kot14 1:8766173d267f 46 * Set error value used in the calculation.
pro100kot14 1:8766173d267f 47 * The resulting resistance is computed as <real resistance> - error;
pro100kot14 1:8766173d267f 48 * @param error Error in Ohms
pro100kot14 1:8766173d267f 49 */
pro100kot14 1:8766173d267f 50 void setError(double error);
pro100kot14 1:8766173d267f 51
pro100kot14 1:8766173d267f 52 /**
pro100kot14 1:8766173d267f 53 * Error value used in the calculation
pro100kot14 1:8766173d267f 54 * The resulting resistance is computed as <real resistance> - error;
pro100kot14 1:8766173d267f 55 * @returns Error in Ohms
pro100kot14 1:8766173d267f 56 */
pro100kot14 1:8766173d267f 57 double getError();
pro100kot14 1:8766173d267f 58
pro100kot14 1:8766173d267f 59 /**
pro100kot14 1:8766173d267f 60 * Set a coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 61 * @param a a-coefficient
pro100kot14 1:8766173d267f 62 */
pro100kot14 1:8766173d267f 63 void setCoefficientA(double a);
pro100kot14 1:8766173d267f 64
pro100kot14 1:8766173d267f 65 /**
pro100kot14 1:8766173d267f 66 * Set b coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 67 * @param b b-coefficient
pro100kot14 1:8766173d267f 68 */
pro100kot14 1:8766173d267f 69 void setCoefficientB(double b);
pro100kot14 1:8766173d267f 70
pro100kot14 1:8766173d267f 71 /**
pro100kot14 1:8766173d267f 72 * Set c coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 73 * @param c c-coefficient
pro100kot14 1:8766173d267f 74 */
pro100kot14 1:8766173d267f 75 void setCoefficientC(double c);
pro100kot14 1:8766173d267f 76
pro100kot14 1:8766173d267f 77 /**
pro100kot14 1:8766173d267f 78 * a coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 79 * @returns a coefficient
pro100kot14 1:8766173d267f 80 */
pro100kot14 1:8766173d267f 81 double getCoefficientA();
pro100kot14 1:8766173d267f 82
pro100kot14 1:8766173d267f 83 /**
pro100kot14 1:8766173d267f 84 * b coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 85 * @returns b coefficient
pro100kot14 1:8766173d267f 86 */
pro100kot14 1:8766173d267f 87 double getCoefficientB();
pro100kot14 1:8766173d267f 88
pro100kot14 1:8766173d267f 89 /**
pro100kot14 1:8766173d267f 90 * c coefficient of Steinhart–Hart equation
pro100kot14 1:8766173d267f 91 * @returns c coefficient
pro100kot14 1:8766173d267f 92 */
pro100kot14 1:8766173d267f 93 double getCoefficientC();
pro100kot14 1:8766173d267f 94
pro100kot14 1:8766173d267f 95 private:
pro100kot14 1:8766173d267f 96 AnalogIn input;
pro100kot14 1:8766173d267f 97 //Thermistor error in Ohms
pro100kot14 1:8766173d267f 98 double error;
pro100kot14 1:8766173d267f 99 double a, b, c;
pro100kot14 1:8766173d267f 100 };
pro100kot14 1:8766173d267f 101
pro100kot14 6:db4538895ae7 102 /**
pro100kot14 6:db4538895ae7 103 * Tested the class Thermistor
pro100kot14 6:db4538895ae7 104 */
pro100kot14 6:db4538895ae7 105 class ThermistorTest{
pro100kot14 6:db4538895ae7 106 public:
pro100kot14 6:db4538895ae7 107 static bool adcValue_0_049_is_0_degree();
pro100kot14 6:db4538895ae7 108 static bool adcValue_0_104_is_15_degree();
pro100kot14 6:db4538895ae7 109 static bool adcValue_0_202_is_30_degree();
pro100kot14 6:db4538895ae7 110 };
pro100kot14 6:db4538895ae7 111
pro100kot14 1:8766173d267f 112 #endif