1 /*
2  * Author: Jon Trulson <jtrulson@ics.com>
3  * Copyright (c) 2015 Intel Corporation.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining
6  * a copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sublicense, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be
14  * included in all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23  */
24 #pragma once
25 
26 #include <iostream>
27 #include <string>
28 #include <mraa/aio.hpp>
29 
30 namespace upm {
31   /**
32    * @brief DFRobot LM35 Linear Temperature Sensor
33    * @defgroup lm35 libupm-lm35
34    * @ingroup dfrobot analog temp
35    */
36 
37   /**
38    * @library lm35
39    * @sensor lm35
40    * @comname DFRobot LM35 Linear Temperature Sensor
41    * @altname LM35
42    * @type temp
43    * @man dfrobot
44    * @web http://www.dfrobot.com/index.php?route=product/product&product_id=76
45    * @con analog
46    *
47    * @brief API for the DFRobot LM35 Linear Temperature Sensor
48    *
49    * This sensor returns an analog voltage proportional to the
50    * temperature of the ambient environment.
51    *
52    * It has a range of 2C to 150C.
53    *
54    * This driver was developed using the DFRobot LM35 Linear
55    * Temperature Sensor
56    *
57    * @snippet lm35.cxx Interesting
58    */
59 
60   class LM35 {
61   public:
62 
63     /**
64      * LM35 constructor
65      *
66      * @param pin Analog pin to use
67      * @param aref Analog reference voltage; default is 5.0 V
68      */
69     LM35(int pin, float aref=5.0);
70 
71     /**
72      * LM35 destructor
73      */
74     ~LM35();
75 
76     /**
77      * Returns the temperature in degrees Celcius
78      *
79      * @return The Temperature in degrees Celcius
80      */
81     float getTemperature();
82 
83   protected:
84     mraa::Aio m_aio;
85 
86   private:
87     float m_aref;
88     // ADC resolution
89     int m_aRes;
90   };
91 }
92 
93 
94