MH_Z19.h

00001 /* mbed MH-Z19 Library
00002  * Copyright (c) 2016, zeus3110
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020  * THE SOFTWARE.
00021  */
00022 
00023 #ifndef MH_Z19_H
00024 #define MH_Z19_H
00025 
00026 #include "mbed.h"
00027 
00028 #define PWM_CYCLE_MS 1004
00029 #define CO2_MAX_PPM 5000
00030 
00031 class MH_Z19 {
00032 public:
00033     /** Create a MH_Z19
00034      *
00035      * @param Port The pwm input pin (must support InterruptIn)
00036      */ 
00037     MH_Z19(PinName Port);
00038 
00039     int ReadCO2PPM();
00040 
00041 protected:        
00042     void rise();
00043     void fall();
00044     
00045     InterruptIn Port;
00046     Timer T;
00047     int OnWidth;
00048 };
00049 
00050 #endif
00051 
00052