129 lines
3.1 KiB
C++
129 lines
3.1 KiB
C++
/*
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GP2Y1010AU0F.cpp - Library for GP2Y1010AU0F air quality detecting.
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Created by fantasymaker, Jan 10, 2016.
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*/
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#include "GP2Y1010AU0F.h"
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#include "Arduino.h" //此句声明了Arduino的标准常量和变量，必须要
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/* 定义时间 */
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const int DELAY_BEFORE_SAMPLING = 280; //采样前等待时间
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const int DELAY_AFTER_SAMPLING = 40; //采样后等待时间
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const int DELAY_LED_OFF = 9680; //间隔时间
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int _ledPin;
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int _outputPin;
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/**
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初始化
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*/
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GP2Y1010AU0F::GP2Y1010AU0F(int ledPin, int outputPin){
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pinMode(ledPin, OUTPUT);
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pinMode(outputPin, INPUT);
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_ledPin = ledPin;
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_outputPin = outputPin;
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}
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/**
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读取输出电压
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*/
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double GP2Y1010AU0F::getOutputV() {
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digitalWrite(_ledPin, LOW);
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delayMicroseconds(DELAY_BEFORE_SAMPLING);
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double analogOutput = analogRead(_outputPin);
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delayMicroseconds(DELAY_AFTER_SAMPLING);
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digitalWrite(_ledPin, HIGH);
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delayMicroseconds(DELAY_LED_OFF);
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//Arduino模拟量读取值的范围为0~1023,以下换算为0~5v
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double outputV = analogOutput / 1024 * 5;
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return outputV;
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}
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/**
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根据输出电压计算灰尘密度
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*/
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double GP2Y1010AU0F::getDustDensity(double outputV) {
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//去除非线性的部分, 只取0.9~3.4v的线性范围, 对应0~500ug/m3
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if(outputV < 0.9){
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outputV = 0.9;
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}else if(outputV > 3.4){
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outputV = 3.4;
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}
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//输出电压和灰尘密度换算公式: ug/m3 = (V - 0.9) / 5 * 1000
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double ugm3 = (outputV - 0.9) / 5 * 1000;
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return ugm3;
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}
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/**
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根据灰尘密度计算AQI
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环境空气质量指数（AQI）技术规定（试行）](http://kjs.mep.gov.cn/hjbhbz/bzwb/dqhjbh/jcgfffbz/201203/t20120302_224166.htm
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*/
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double GP2Y1010AU0F::getAQI(double ugm3) {
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double aqiL = 0;
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double aqiH = 0;
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double bpL = 0;
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double bpH = 0;
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double aqi = 0;
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//根据pm2.5和aqi对应关系分别计算aqi
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if (ugm3 >= 0 && ugm3 <= 35) {
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aqiL = 0;
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aqiH = 50;
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bpL = 0;
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bpH = 35;
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} else if (ugm3 > 35 && ugm3 <= 75) {
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aqiL = 50;
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aqiH = 100;
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bpL = 35;
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bpH = 75;
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} else if (ugm3 > 75 && ugm3 <= 115) {
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aqiL = 100;
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aqiH = 150;
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bpL = 75;
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bpH = 115;
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} else if (ugm3 > 115 && ugm3 <= 150) {
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aqiL = 150;
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aqiH = 200;
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bpL = 115;
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bpH = 150;
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} else if (ugm3 > 150 && ugm3 <= 250) {
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aqiL = 200;
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aqiH = 300;
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bpL = 150;
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bpH = 250;
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} else if (ugm3 > 250 && ugm3 <= 350) {
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aqiL = 300;
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aqiH = 400;
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bpL = 250;
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bpH = 350;
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} else if (ugm3 > 350) {
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aqiL = 400;
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aqiH = 500;
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bpL = 350;
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bpH = 500;
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}
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//公式aqi = (aqiH - aqiL) / (bpH - bpL) * (desity - bpL) + aqiL;
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aqi = (aqiH - aqiL) / (bpH - bpL) * (ugm3 - bpL) + aqiL;
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return aqi;
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}
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/**
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根据aqi获取级别描述
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*/
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int GP2Y1010AU0F::getGradeInfo(double aqi) {
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int gradeInfo;
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if (aqi >= 0 && aqi <= 50) {
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gradeInfo = GRADE_PERFECT;
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} else if (aqi > 50 && aqi <= 100) {
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gradeInfo = GRADE_GOOD;
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} else if (aqi > 100 && aqi <= 150) {
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gradeInfo = GRADE_POLLUTED_MILD;
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} else if (aqi > 150 && aqi <= 200) {
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gradeInfo = GRADE_POLLUTED_MEDIUM;
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} else if (aqi > 200 && aqi <= 300) {
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gradeInfo = GRADE_POLLUTED_HEAVY;
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} else if (aqi > 300 && aqi <= 500) {
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gradeInfo = GRADE_POLLUTED_SEVERE;
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}
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return gradeInfo;
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}
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