Diff: mbedEndpointResources/TempResource.h

Revision:

0:a9025db1ac76

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbedEndpointResources/TempResource.h	Tue May 12 00:51:01 2015 +0000
@@ -0,0 +1,64 @@
+/**
+ * @file    TempResource.h
+ * @brief   mbed CoAP Endpoint
+ * @author  Michael Koster
+ * @version 1.0
+ * @see
+ *
+ * Copyright (c) 2015
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __TEMP_RESOURCE_H__
+#define __TEMP_RESOURCE_H__
+
+// Base class
+#include "DynamicResource.h"
+
+// Temp Sensor connected to A0
+AnalogIn temp_in(A0);
+
+/** TempResource class
+ */
+class TempResource : public DynamicResource
+{
+public:
+    /**
+    Default constructor
+    @param logger input logger instance for this resource
+    @param name input the resource name
+    @param observable input the resource is Observable (default: FALSE)
+    */
+    TempResource(const Logger *logger,const char *name,const bool observable = false) : 
+        DynamicResource(logger,name,"Temperature", SN_GRS_GET_ALLOWED,observable) {
+    }
+
+    /**
+    Get the value of the Temperature Sensor
+    @returns string containing the temperature value in Fahrenheit
+    */
+    virtual string get() {
+        char temp_str[8];
+        int B = 3975;
+        memset(temp_str,0,8);
+        float temp_read = temp_in.read();
+        float resistance = (1-temp_read) * 10000/temp_read; //get the resistance of the sensor;
+        float temp_c = 1/( logf(resistance/10000)/B + 1/298.15 ) - 273.15;//convert to temperature via datasheet ;
+        float temp_f = (1.8 * (double) temp_c) + 32;
+        sprintf(temp_str,"%8.2f", temp_f);
+        return string(temp_str);
+    }
+};
+
+#endif // __TEMP_RESOURCE_H__