d 0773d / TempSensor

Sample program to get ambient temperature from MCP9700 sensor

Fork of TempSensor by Ken Todotani

LinearTempSensor/LinearTempSensor.h@1:6a589f1dd263, 2013-06-17 (annotated)

Committer:
d0773d
Date:
Mon Jun 17 06:26:09 2013 +0000
Revision:
1:6a589f1dd263
Parent:
0:6dde232b3b3b 

        

        
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/* mbed Linear Temperature Sensor library





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 * Supports Microchip MCP9700/9701, National Semiconductor LM35





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 *





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 * Written by Todotani, Nov 22 2010





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 */





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#ifndef MBED_LINEARTEMPSENSOR_H





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#define MBED_LINEARTEMPSENSOR_H





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#include "mbed.h"





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/** Linear Temperature Sensor class.





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 * Sample and store sensor acuired value in N (default=10) times and





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 * calculate avarage temperature from sampled data





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 * Supports Microchip MCP9700/9701, National Semiconductor LM35





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 * @author Todotani





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 */





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class LinearTempSensor {





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public:





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    /** Sensor Type Definitions  */





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    enum SensorType {





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        MCP9700,    /**< Microchip MCP9700 (Default)  */





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        MCP9701,    /**< Microchip MCP9701 */





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        LM35        /**< National Semiconductor LM35 */





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    };





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    /** Create a Temperature Sensor instanse





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     *





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     * @param ain       PinName of analog input





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     * @param N         Number of samples to calculate average temperature (default = 10)





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     * @param type      Sensor type (default = MCP9700)





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     */





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    LinearTempSensor(PinName ain, int N = 10, SensorType type = MCP9700);





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    /** Sample (read) sensor data and store to buffer





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     *





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     * @param None





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     * @return Sensor-acuired value (mV)





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     */





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     float Sense();





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    /** Calculate average temperature from sample buffer





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     *





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     * @param None





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     * @return Average temperature from N times of sumple (Centigrade)





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     */





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     float GetAverageTemp();





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    /** Calculate temperature from the latest sample





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     *





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     * @param None





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     * @return Temperature from the latest sampled data (Centigrade)





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     */





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     float GetLatestTemp();





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     ~LinearTempSensor();





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private:





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    AnalogIn    _ain;





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    int         _samples;





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    SensorType  _type;





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    float       *sampleBuffer;      // Buffer to store sensor acuired data





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    bool        bufferNotFilled;    // Flag shows that buffer have not filled





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    uint32_t    sampleCount;





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    uint32_t    index;





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    float   V0;                      // Sensor read value in case 0 degree





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    float   Tc;                      // Tmperature coefficient (temprature inclease) in each degree





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    float   Vref;                    // Reference volgate for ADC





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};





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#endif