Diff: LinearTempSensor.h

Revision:

0:4b56d28cc7e9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LinearTempSensor.h	Wed Dec 02 11:39:52 2015 +0000
@@ -0,0 +1,73 @@
+/* mbed Linear Temperature Sensor library
+ * Supports Microchip MCP9700/9701, National Semiconductor LM35
+ *
+ * Written by Todotani, Nov 22 2010
+ */
+ 
+#ifndef MBED_LINEARTEMPSENSOR_H
+#define MBED_LINEARTEMPSENSOR_H
+
+#include "mbed.h"
+
+/** Linear Temperature Sensor class.
+ * Sample and store sensor acuired value in N (default=10) times and
+ * calculate avarage temperature from sampled data
+ * Supports Microchip MCP9700/9701, National Semiconductor LM35
+ * @author Todotani
+ */
+class LinearTempSensor {
+public:
+    /** Sensor Type Definitions  */
+    enum SensorType {
+        MCP9700,    /**< Microchip MCP9700 (Default)  */
+        MCP9701,    /**< Microchip MCP9701 */
+        LM35        /**< National Semiconductor LM35 */
+    };
+    
+    /** Create a Temperature Sensor instanse
+     *
+     * @param ain       PinName of analog input
+     * @param N         Number of samples to calculate average temperature (default = 10)
+     * @param type      Sensor type (default = MCP9700)
+     */
+    LinearTempSensor(PinName ain, int N = 10, SensorType type = MCP9700);
+    
+    /** Sample (read) sensor data and store to buffer
+     *
+     * @param None
+     * @return Sensor-acuired value (mV)
+     */
+     float Sense();
+     
+    /** Calculate average temperature from sample buffer
+     *
+     * @param None
+     * @return Average temperature from N times of sumple (Centigrade)
+     */
+     float GetAverageTemp();
+     
+    /** Calculate temperature from the latest sample
+     *
+     * @param None
+     * @return Temperature from the latest sampled data (Centigrade)
+     */
+     float GetLatestTemp();
+
+     ~LinearTempSensor();
+
+private:
+    AnalogIn    _ain;
+    int         _samples;
+    SensorType  _type;
+    
+    float       *sampleBuffer;      // Buffer to store sensor acuired data
+    bool        bufferNotFilled;    // Flag shows that buffer have not filled
+    uint32_t    sampleCount;
+    uint32_t    index;
+
+    float   V0;                      // Sensor read value in case 0 degree
+    float   Tc;                      // Tmperature coefficient (temprature inclease) in each degree
+    float   Vref;                    // Reference volgate for ADC
+};
+
+#endif
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