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#include <SimpleTimer.h>
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>
Adafruit_PCD8544 display = Adafruit_PCD8544(8, 9, 10, 11, 12);
/* Connect the DSM501 sensor as follow
* https://www.elektronik.ropla.eu/pdf/stock/smy/dsm501.pdf
* 1 green vert - Not used
* 2 yellow jaune - Vout2 - 1 microns (PM1.0)
* 3 white blanc - Vcc
* 4 red rouge - Vout1 - 2.5 microns (PM2.5)
* 5 black noir - GND
*/
#define DUST_SENSOR_DIGITAL_PIN_PM10 5 // DSM501 Pin 2 of DSM501 (jaune / Yellow)
#define DUST_SENSOR_DIGITAL_PIN_PM25 6 // DSM501 Pin 4 (rouge / red)
#define COUNTRY 0 // 0. France, 1. Europe, 2. USA/China
#define EXCELLENT "Excellent"
#define GOOD "Good"
#define ACCEPTABLE "Acceptable"
#define MODERATE "Moderate"
#define HEAVY "Heavy"
#define SEVERE "Severe"
#define HAZARDOUS "Dangerous"
unsigned long duration;
unsigned long starttime;
unsigned long endtime;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
unsigned long SLEEP_TIME = 2 * 1000; // Sleep time between reads (in milliseconds)
//unsigned long sampletime_ms = 1 * 1000; // Durée de mesure - sample time (ms)
unsigned long sampletime_ms = 10 * 1000; // Durée de mesure - sample time (ms)
//unsigned long sampletime_ms = 5 * 60 * 1000; // Durée de mesure - sample time (ms)
struct structAQI{
// variable enregistreur - recorder variables
unsigned long durationPM10;
unsigned long lowpulseoccupancyPM10 = 0;
unsigned long durationPM25;
unsigned long lowpulseoccupancyPM25 = 0;
unsigned long starttime;
unsigned long endtime;
// Sensor AQI data
float concentrationPM25 = 0;
float concentrationPM10 = 0;
int AqiPM10 = -1;
int AqiPM25 = -1;
// Indicateurs AQI - AQI display
int AQI = 0;
String AqiString = "";
int AqiColor = 0;
};
struct structAQI AQI;
SimpleTimer timer;
void updateAQILevel(){
AQI.AQI = AQI.AqiPM10;
}
void updateAQI() {
// Actualise les mesures - update measurements
AQI.endtime = millis();
float ratio = AQI.lowpulseoccupancyPM10 / (sampletime_ms * 10.0);
float concentration = 1.1 * pow( ratio, 3) - 3.8 *pow(ratio, 2) + 520 * ratio + 0.62; // using spec sheet curve
if ( sampletime_ms < 3600000 ) { concentration = concentration * ( sampletime_ms / 3600000.0 ); }
AQI.lowpulseoccupancyPM10 = 0;
AQI.concentrationPM10 = concentration;
ratio = AQI.lowpulseoccupancyPM25 / (sampletime_ms * 10.0);
concentration = 1.1 * pow( ratio, 3) - 3.8 *pow(ratio, 2) + 520 * ratio + 0.62;
if ( sampletime_ms < 3600000 ) { concentration = concentration * ( sampletime_ms / 3600000.0 ); }
AQI.lowpulseoccupancyPM25 = 0;
AQI.concentrationPM25 = concentration;
Serial.print("Concentrations => PM2.5: "); Serial.print(AQI.concentrationPM25); Serial.print(" | PM10: "); Serial.println(AQI.concentrationPM10);
AQI.starttime = millis();
// Actualise l'AQI de chaque capteur - update AQI for each sensor
if ( COUNTRY == 0 ) {
// France
AQI.AqiPM25 = getATMO( 0, AQI.concentrationPM25 );
AQI.AqiPM10 = getATMO( 1, AQI.concentrationPM10 );
} else if ( COUNTRY == 1 ) {
// Europe
AQI.AqiPM25 = getACQI( 0, AQI.concentrationPM25 );
AQI.AqiPM10 = getACQI( 1, AQI.concentrationPM10 );
} else {
// USA / China
AQI.AqiPM25 = getAQI( 0, AQI.concentrationPM25 );
AQI.AqiPM10 = getAQI( 0, AQI.concentrationPM10 );
}
// Actualise l'indice AQI - update AQI index
updateAQILevel();
updateAQIDisplay();
Serial.print("AQIs => PM25: "); Serial.print(AQI.AqiPM25); Serial.print(" | PM10: "); Serial.println(AQI.AqiPM10);
Serial.print(" | AQI: "); Serial.println(AQI.AQI); Serial.print(" | Message: "); Serial.println(AQI.AqiString);
}
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
pinMode(DUST_SENSOR_DIGITAL_PIN_PM10,INPUT);
pinMode(DUST_SENSOR_DIGITAL_PIN_PM25,INPUT);
display.begin();
display.clearDisplay(); // clears the screen and buffer
display.display();
display.setTextColor(BLACK);
display.setContrast(70);
// wait 60s for DSM501 to warm up
for (int i = 1; i <= 5; i++)
{
delay(1000); // 1s
Serial.print(i);
Serial.println(" s (wait 60s for DSM501 to warm up)");
}
Serial.println("Ready!");
AQI.starttime = millis();
timer.setInterval(sampletime_ms, updateAQI);
}
void loop() {
AQI.lowpulseoccupancyPM10 += pulseIn(DUST_SENSOR_DIGITAL_PIN_PM10, LOW);
AQI.lowpulseoccupancyPM25 += pulseIn(DUST_SENSOR_DIGITAL_PIN_PM25, LOW);
timer.run();
display.clearDisplay();
display.setContrast(70);
display.setTextSize(1);
display.setCursor(0,0);
display.print("PM 2.5:");
display.setTextSize(1);
display.setCursor(45,0);
display.print(AQI.concentrationPM25);
display.setTextSize(1);
display.setCursor(0,10);
display.print("Aqui:");
display.setTextSize(1);
display.setCursor(35,10);
display.print( AQI.AqiPM25);
display.setTextSize(1);
display.setCursor(0,16);
display.print("--------------");
display.setTextSize(1);
display.setCursor(0,22);
display.print("PM 10:");
display.setTextSize(1);
display.setCursor(45,22);
display.print(AQI.concentrationPM10);
display.setTextSize(1);
display.setCursor(0,30);
display.print("Aqui:");
display.setTextSize(1);
display.setCursor(35,30);
display.print(AQI.AqiPM10);
display.setTextSize(1);
display.setCursor(0,35);
display.print("--------------");
display.setTextSize(1);
display.setCursor(15,40);
display.print(AQI.AqiString);
display.display();
delay(1000);
}
/*
* Calcul l'indice de qualité de l'air français ATMO
* Calculate French ATMO AQI indicator
*/
int getATMO( int sensor, float density ){
if ( sensor == 0 ) { //PM2,5
if ( density <= 11 ) {
return 1;
} else if ( density > 11 && density <= 24 ) {
return 2;
} else if ( density > 24 && density <= 36 ) {
return 3;
} else if ( density > 36 && density <= 41 ) {
return 4;
} else if ( density > 41 && density <= 47 ) {
return 5;
} else if ( density > 47 && density <= 53 ) {
return 6;
} else if ( density > 53 && density <= 58 ) {
return 7;
} else if ( density > 58 && density <= 64 ) {
return 8;
} else if ( density > 64 && density <= 69 ) {
return 9;
} else {
return 10;
}
} else {
if ( density <= 6 ) {
return 1;
} else if ( density > 6 && density <= 13 ) {
return 2;
} else if ( density > 13 && density <= 20 ) {
return 3;
} else if ( density > 20 && density <= 27 ) {
return 4;
} else if ( density > 27 && density <= 34 ) {
return 5;
} else if ( density > 34 && density <= 41 ) {
return 6;
} else if ( density > 41 && density <= 49 ) {
return 7;
} else if ( density > 49 && density <= 64 ) {
return 8;
} else if ( density > 64 && density <= 79 ) {
return 9;
} else {
return 10;
}
}
}
void updateAQIDisplay(){
/*
* 1 EXCELLENT
* 2 GOOD
* 3 ACCEPTABLE
* 4 MODERATE
* 5 HEAVY
* 6 SEVERE
* 7 HAZARDOUS
*/
if ( COUNTRY == 0 ) {
// Système ATMO français - French ATMO AQI system
switch ( AQI.AQI) {
case 10:
AQI.AqiString = SEVERE;
break;
case 9:
AQI.AqiString = HEAVY;
break;
case 8:
AQI.AqiString = HEAVY;
break;
case 7:
AQI.AqiString = MODERATE;
break;
case 6:
AQI.AqiString = MODERATE;
break;
case 5:
AQI.AqiString = ACCEPTABLE;
break;
case 4:
AQI.AqiString = GOOD;
break;
case 3:
AQI.AqiString = GOOD;
break;
case 2:
AQI.AqiString = EXCELLENT;
break;
case 1:
AQI.AqiString = EXCELLENT;
break;
}
} else if ( COUNTRY == 1 ) {
// European CAQI
switch ( AQI.AQI) {
case 25:
AQI.AqiString = GOOD;
break;
case 50:
AQI.AqiString = ACCEPTABLE;
break;
case 75:
AQI.AqiString = MODERATE;
break;
case 100:
AQI.AqiString = HEAVY;
break;
default:
AQI.AqiString = SEVERE;
}
} else if ( COUNTRY == 2 ) {
// USA / CN
if ( AQI.AQI <= 50 ) {
AQI.AqiString = GOOD;
} else if ( AQI.AQI > 50 && AQI.AQI <= 100 ) {
AQI.AqiString = ACCEPTABLE;
} else if ( AQI.AQI > 100 && AQI.AQI <= 150 ) {
AQI.AqiString = MODERATE;
} else if ( AQI.AQI > 150 && AQI.AQI <= 200 ) {
AQI.AqiString = HEAVY;
} else if ( AQI.AQI > 200 && AQI.AQI <= 300 ) {
AQI.AqiString = SEVERE;
} else {
AQI.AqiString = HAZARDOUS;
}
}
}
/*
* CAQI Européen - European CAQI level
* source : http://www.airqualitynow.eu/about_indices_definition.php
*/
int getACQI( int sensor, float density ){
if ( sensor == 0 ) { //PM2,5
if ( density == 0 ) {
return 0;
} else if ( density <= 15 ) {
return 25 ;
} else if ( density > 15 && density <= 30 ) {
return 50;
} else if ( density > 30 && density <= 55 ) {
return 75;
} else if ( density > 55 && density <= 110 ) {
return 100;
} else {
return 150;
}
} else { //PM10
if ( density == 0 ) {
return 0;
} else if ( density <= 25 ) {
return 25 ;
} else if ( density > 25 && density <= 50 ) {
return 50;
} else if ( density > 50 && density <= 90 ) {
return 75;
} else if ( density > 90 && density <= 180 ) {
return 100;
} else {
return 150;
}
}
}
/*
* AQI formula: https://en.wikipedia.org/wiki/Air_Quality_Index#United_States
* Arduino code https://gist.github.com/nfjinjing/8d63012c18feea3ed04e
* On line AQI calculator https://www.airnow.gov/index.cfm?action=resources.conc_aqi_calc
*/
float calcAQI(float I_high, float I_low, float C_high, float C_low, float C) {
return (I_high - I_low) * (C - C_low) / (C_high - C_low) + I_low;
}
int getAQI(int sensor, float density) {
int d10 = (int)(density * 10);
if ( sensor == 0 ) {
if (d10 <= 0) {
return 0;
}
else if(d10 <= 120) {
return calcAQI(50, 0, 120, 0, d10);
}
else if (d10 <= 354) {
return calcAQI(100, 51, 354, 121, d10);
}
else if (d10 <= 554) {
return calcAQI(150, 101, 554, 355, d10);
}
else if (d10 <= 1504) {
return calcAQI(200, 151, 1504, 555, d10);
}
else if (d10 <= 2504) {
return calcAQI(300, 201, 2504, 1505, d10);
}
else if (d10 <= 3504) {
return calcAQI(400, 301, 3504, 2505, d10);
}
else if (d10 <= 5004) {
return calcAQI(500, 401, 5004, 3505, d10);
}
else if (d10 <= 10000) {
return calcAQI(1000, 501, 10000, 5005, d10);
}
else {
return 1001;
}
} else {
if (d10 <= 0) {
return 0;
}
else if(d10 <= 540) {
return calcAQI(50, 0, 540, 0, d10);
}
else if (d10 <= 1540) {
return calcAQI(100, 51, 1540, 541, d10);
}
else if (d10 <= 2540) {
return calcAQI(150, 101, 2540, 1541, d10);
}
else if (d10 <= 3550) {
return calcAQI(200, 151, 3550, 2541, d10);
}
else if (d10 <= 4250) {
return calcAQI(300, 201, 4250, 3551, d10);
}
else if (d10 <= 5050) {
return calcAQI(400, 301, 5050, 4251, d10);
}
else if (d10 <= 6050) {
return calcAQI(500, 401, 6050, 5051, d10);
}
else {
return 1001;
}
}
}
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