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#include<string.h>
#define PM1PIN 18 //DSM501A input D6 on ESP8266
#define PM25PIN 14 // ???? what
byte buff[2];
unsigned long durationPM1;
unsigned long durationPM25;
unsigned long starttime;
unsigned long endtime;
unsigned long sampletime_ms = 30000;
unsigned long lowpulseoccupancyPM1 = 0;
unsigned long lowpulseoccupancyPM25 = 0;
int i=0;
void setup()
{
Serial.begin(9600);
Serial.println("Starting please wait 30s");
pinMode(PM1PIN,INPUT);
pinMode(PM25PIN,INPUT);
starttime = millis();
}
float calculateConcentration(long lowpulseInMicroSeconds, long durationinSeconds){
float ratio = (lowpulseInMicroSeconds/1000000.0)/30.0*100.0; //Calculate the ratio
float concentration = 0.001915 * pow(ratio,2) + 0.09522 * ratio - 0.04884;//Calculate the mg/m3
Serial.print("lowpulseoccupancy:");
Serial.print(lowpulseInMicroSeconds);
Serial.print(" ratio:");
Serial.print(ratio);
Serial.print(" Concentration:");
Serial.println(concentration);
return concentration;
}
void loop()
{
durationPM1 = pulseIn(PM1PIN, LOW);
durationPM25 = pulseIn(PM25PIN, LOW);
lowpulseoccupancyPM1 += durationPM1;
lowpulseoccupancyPM25 += durationPM25;
endtime = millis();
if ((endtime-starttime) > sampletime_ms) //Only after 30s has passed we calcualte the ratio
{
/*
ratio1 = (lowpulseoccupancy/1000000.0)/30.0*100.0; //Calculate the ratio
Serial.print("ratio1: ");
Serial.println(ratio1);
concentration = 0.001915 * pow(ratio1,2) + 0.09522 * ratio1 - 0.04884;//Calculate the mg/m3
*/
float conPM1 = calculateConcentration(lowpulseoccupancyPM1,30);
float conPM25 = calculateConcentration(lowpulseoccupancyPM25,30);
Serial.print("PM1 ");
Serial.print(conPM1);
Serial.print(" PM25 ");
Serial.println(conPM25);
lowpulseoccupancyPM1 = 0;
lowpulseoccupancyPM25 = 0;
starttime = millis();
}
}
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