Min-ji Song / Air_Quality

update

Dependents:   mbed_Wiznet_W7500 httpServer-WIZwiki-W7500

Fork of Air_Quality by Seo-young Yoon

Air_Quality.cpp@1:3d804fbaa44d, 2015-08-12 (annotated)

Committer:
M_J
Date:
Wed Aug 12 04:49:28 2015 +0000
Revision:
1:3d804fbaa44d
Parent:
0:7653022b71cb 
update

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ysy00700 0:7653022b71cb 1 //
ysy00700 0:7653022b71cb 2 // modified by mbed group for use with the mbed platform
ysy00700 0:7653022b71cb 3 // modification date 9/4/2014
ysy00700 0:7653022b71cb 4 //
ysy00700 0:7653022b71cb 5
ysy00700 0:7653022b71cb 6 /*
ysy00700 0:7653022b71cb 7 AirQuality library v1.0
ysy00700 0:7653022b71cb 8 2010 Copyright (c) Seeed Technology Inc. All right reserved.
ysy00700 0:7653022b71cb 9
ysy00700 0:7653022b71cb 10 Original Author: Bruce.Qin
ysy00700 0:7653022b71cb 11
ysy00700 0:7653022b71cb 12 This library is free software; you can redistribute it and/or
ysy00700 0:7653022b71cb 13 modify it under the terms of the GNU Lesser General Public
ysy00700 0:7653022b71cb 14 License as published by the Free Software Foundation; either
ysy00700 0:7653022b71cb 15 version 2.1 of the License, or (at your option) any later version.
ysy00700 0:7653022b71cb 16
ysy00700 0:7653022b71cb 17 This library is distributed in the hope that it will be useful,
ysy00700 0:7653022b71cb 18 but WITHOUT ANY WARRANTY; without even the implied warranty of
ysy00700 0:7653022b71cb 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
ysy00700 0:7653022b71cb 20 Lesser General Public License for more details.
ysy00700 0:7653022b71cb 21
ysy00700 0:7653022b71cb 22 You should have received a copy of the GNU Lesser General Public
ysy00700 0:7653022b71cb 23 License along with this library; if not, write to the Free Software
ysy00700 0:7653022b71cb 24 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
ysy00700 0:7653022b71cb 25 */
ysy00700 0:7653022b71cb 26 #include"Air_Quality.h"
ysy00700 0:7653022b71cb 27
ysy00700 0:7653022b71cb 28 // Interrupt Handler Assignment
ysy00700 0:7653022b71cb 29 Ticker IntHandler;
ysy00700 0:7653022b71cb 30
ysy00700 0:7653022b71cb 31 //Get the avg voltage in 5 minutes.
ysy00700 0:7653022b71cb 32 void AirQuality::avgVoltage()
ysy00700 0:7653022b71cb 33 {
ysy00700 0:7653022b71cb 34 if(i==150) { //sum 5 minutes
ysy00700 0:7653022b71cb 35 vol_standard=temp/150;
ysy00700 0:7653022b71cb 36 temp=0;
ysy00700 0:7653022b71cb 37 printf("Vol_standard in 5 minutes: %d\n\r",vol_standard);
ysy00700 0:7653022b71cb 38 i=0;
ysy00700 0:7653022b71cb 39 } else {
ysy00700 0:7653022b71cb 40 temp+=first_vol;
ysy00700 0:7653022b71cb 41 i++;
ysy00700 0:7653022b71cb 42 }
ysy00700 0:7653022b71cb 43 }
ysy00700 0:7653022b71cb 44
ysy00700 0:7653022b71cb 45 void AirQuality::init(PinName pin, void(*IRQ)(void))
ysy00700 0:7653022b71cb 46 {
ysy00700 0:7653022b71cb 47 _pin=pin;
ysy00700 0:7653022b71cb 48 AnalogIn sensor(_pin);
ysy00700 0:7653022b71cb 49 unsigned char i = 0;
ysy00700 0:7653022b71cb 50 wait(2); //2s
ysy00700 0:7653022b71cb 51 init_voltage = sensor.read() * 1000; // boost the value to be on a 0 -> 1000 scale for compatibility
ysy00700 0:7653022b71cb 52 while(init_voltage) {
ysy00700 0:7653022b71cb 53 if((init_voltage < 798) && (init_voltage > 10)) {
ysy00700 0:7653022b71cb 54 // the init voltage is ok
ysy00700 0:7653022b71cb 55 first_vol = sensor.read() * 1000;//initialize first value
ysy00700 0:7653022b71cb 56 last_vol = first_vol;
ysy00700 0:7653022b71cb 57 vol_standard = last_vol;
ysy00700 0:7653022b71cb 58 error = false;;
ysy00700 0:7653022b71cb 59 break;
ysy00700 0:7653022b71cb 60 } else if(init_voltage > 798 || init_voltage <= 10) {
ysy00700 0:7653022b71cb 61 // The sensor is not ready, wait a bit for it to cool off
ysy00700 0:7653022b71cb 62 i++;
ysy00700 0:7653022b71cb 63 wait(60);//60s
ysy00700 0:7653022b71cb 64 init_voltage = sensor.read() * 1000;
ysy00700 0:7653022b71cb 65 if(i==5) {
ysy00700 0:7653022b71cb 66 // After 5 minutes warn user that the sensor may be broken
ysy00700 0:7653022b71cb 67 i = 0;
ysy00700 0:7653022b71cb 68 error = true;
ysy00700 0:7653022b71cb 69 printf("Sensor Error! You may have a bad sensor. :-(\n\r");
ysy00700 0:7653022b71cb 70 }
ysy00700 0:7653022b71cb 71 } else
ysy00700 0:7653022b71cb 72 break;
ysy00700 0:7653022b71cb 73 }
ysy00700 0:7653022b71cb 74 // Call AirQualityInterrupt every 2seconds
M_J 1:3d804fbaa44d 75 IntHandler.attach(IRQ, 0.5);
ysy00700 0:7653022b71cb 76 }
ysy00700 0:7653022b71cb 77
ysy00700 0:7653022b71cb 78 int AirQuality::slope(void)
ysy00700 0:7653022b71cb 79 {
ysy00700 0:7653022b71cb 80 while(timer_index) {
ysy00700 0:7653022b71cb 81 if(first_vol-last_vol > 400 || first_vol > 700) {
M_J 1:3d804fbaa44d 82 printf("5. Air_quality : %d",first_vol);
ysy00700 0:7653022b71cb 83 timer_index = 0;
ysy00700 0:7653022b71cb 84 avgVoltage();
ysy00700 0:7653022b71cb 85 return 0;
ysy00700 0:7653022b71cb 86 } else if((first_vol - last_vol > 400 && first_vol < 700) || first_vol - vol_standard > 150) {
M_J 1:3d804fbaa44d 87 printf("5. Air_quality : %d",first_vol);
ysy00700 0:7653022b71cb 88 timer_index = 0;
ysy00700 0:7653022b71cb 89 avgVoltage();
ysy00700 0:7653022b71cb 90 return 1;
ysy00700 0:7653022b71cb 91
ysy00700 0:7653022b71cb 92 } else if((first_vol-last_vol > 200 && first_vol < 700) || first_vol - vol_standard > 50) {
ysy00700 0:7653022b71cb 93 //printf(first_vol-last_vol);
M_J 1:3d804fbaa44d 94 printf("5. Air_quality : %d",first_vol);
ysy00700 0:7653022b71cb 95 timer_index = 0;
ysy00700 0:7653022b71cb 96 avgVoltage();
ysy00700 0:7653022b71cb 97 return 2;
ysy00700 0:7653022b71cb 98 } else {
ysy00700 0:7653022b71cb 99 avgVoltage();
M_J 1:3d804fbaa44d 100 printf("5. Air_quality : %d",first_vol);
ysy00700 0:7653022b71cb 101 timer_index = 0;
ysy00700 0:7653022b71cb 102 return 3;
ysy00700 0:7653022b71cb 103 }
ysy00700 0:7653022b71cb 104 }
ysy00700 0:7653022b71cb 105 return -1;
ysy00700 0:7653022b71cb 106 }