zeus 3110 / Mbed 2 deprecated MH-Z19_Test

CO2 Sensor MH-Z19 Class (uses interrupt input as PWM input)

Dependencies:   mbed

MH_Z19.cpp@0:3c154d34f47e, 2016-08-11 (annotated)

Committer:
zeus3110
Date:
Thu Aug 11 00:41:23 2016 +0000
Revision:
0:3c154d34f47e
Initial Release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
zeus3110 0:3c154d34f47e 1 /* mbed MH-Z19 Library
zeus3110 0:3c154d34f47e 2 * Copyright (c) 2016, zeus3110
zeus3110 0:3c154d34f47e 3 *
zeus3110 0:3c154d34f47e 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
zeus3110 0:3c154d34f47e 5 * of this software and associated documentation files (the "Software"), to deal
zeus3110 0:3c154d34f47e 6 * in the Software without restriction, including without limitation the rights
zeus3110 0:3c154d34f47e 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
zeus3110 0:3c154d34f47e 8 * copies of the Software, and to permit persons to whom the Software is
zeus3110 0:3c154d34f47e 9 * furnished to do so, subject to the following conditions:
zeus3110 0:3c154d34f47e 10 *
zeus3110 0:3c154d34f47e 11 * The above copyright notice and this permission notice shall be included in
zeus3110 0:3c154d34f47e 12 * all copies or substantial portions of the Software.
zeus3110 0:3c154d34f47e 13 *
zeus3110 0:3c154d34f47e 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
zeus3110 0:3c154d34f47e 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
zeus3110 0:3c154d34f47e 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
zeus3110 0:3c154d34f47e 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
zeus3110 0:3c154d34f47e 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
zeus3110 0:3c154d34f47e 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
zeus3110 0:3c154d34f47e 20 * THE SOFTWARE.
zeus3110 0:3c154d34f47e 21 */
zeus3110 0:3c154d34f47e 22
zeus3110 0:3c154d34f47e 23 #include "MH_Z19.h"
zeus3110 0:3c154d34f47e 24
zeus3110 0:3c154d34f47e 25 MH_Z19::MH_Z19(PinName p) : Port(p) {
zeus3110 0:3c154d34f47e 26 Port.rise(this, &MH_Z19::rise);
zeus3110 0:3c154d34f47e 27 Port.fall(this, &MH_Z19::fall);
zeus3110 0:3c154d34f47e 28 OnWidth=2;
zeus3110 0:3c154d34f47e 29 T.start();
zeus3110 0:3c154d34f47e 30 }
zeus3110 0:3c154d34f47e 31
zeus3110 0:3c154d34f47e 32 int MH_Z19::ReadCO2PPM() {
zeus3110 0:3c154d34f47e 33
zeus3110 0:3c154d34f47e 34 return ((CO2_MAX_PPM)*(OnWidth-2)/(PWM_CYCLE_MS-4));
zeus3110 0:3c154d34f47e 35
zeus3110 0:3c154d34f47e 36 }
zeus3110 0:3c154d34f47e 37
zeus3110 0:3c154d34f47e 38
zeus3110 0:3c154d34f47e 39 void MH_Z19::rise() {
zeus3110 0:3c154d34f47e 40 T.reset();
zeus3110 0:3c154d34f47e 41 }
zeus3110 0:3c154d34f47e 42
zeus3110 0:3c154d34f47e 43 void MH_Z19::fall() {
zeus3110 0:3c154d34f47e 44 OnWidth=T.read_ms();
zeus3110 0:3c154d34f47e 45 }