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93 lines
2.8 KiB
93 lines
2.8 KiB
#include <math.h>
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int DustSensePin = 13;
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//let's start with 100 readings. (copy and paste)
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unsigned int airreading[100] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
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unsigned long starttime = 0;
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unsigned long sampletime_ms = 60000;//sample 60s == 60000 ;
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unsigned long lowpulseoccupancy = 0;
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float ratio = 0;
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float concentration = 0;
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unsigned int x = 0;
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unsigned int toplimit = 0;
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unsigned long sum = 0; //highest number possible - 32 bit unsigned, so 4 billion
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unsigned int average = 0;
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void setup()
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{
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Serial.begin(9600);
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Serial.println("Starting Air Sensor, please wait for readings...");
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pinMode(DustSensePin,INPUT);
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starttime = millis();//get the current time;
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}
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void loop()
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{
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airreading[x] = pulseIn(DustSensePin, LOW, 500000);
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/*lowpulseoccupancy = lowpulseoccupancy+duration;
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if ((millis()-starttime) > sampletime_ms)//if the sample time == 30s
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{
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ratio = lowpulseoccupancy/(sampletime_ms*10.0); // Integer percentage 0=>100
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concentration = 1.1*powf(ratio,3)-3.8*powf(ratio,2)+520*ratio+0.62; // using spec sheet curve
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Serial.print(lowpulseoccupancy);
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Serial.print(",");
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Serial.print(ratio);
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Serial.print(",");
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Serial.println(concentration);
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lowpulseoccupancy = 0;
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starttime = millis();
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}
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*/
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//if ((millis()-starttime) > sampletime_ms){
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//KISS. Relative readings only.
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//Something else keeps the time.
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if (airreading[x] != 0){
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Serial.println(airreading[x]);
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x=x+1;
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if(x>100){
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x = 0;
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}
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}
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//starttime = millis();
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//}
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//KISS. Average for a minute, and store that data in a webpage (that part will be in ethernet sensor test 3).
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//
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if ((millis()-starttime) > sampletime_ms){
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toplimit = x; // don't read the zeros
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if(toplimit == 0){
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toplimit = 1; //to avoid divide by zero, in case sum / toplimit is both zero
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}
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for (x=0; x<toplimit; x++){
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sum = sum + airreading[x];
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}
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average = sum / toplimit;
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Serial.print("Average Get!: ");
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Serial.println(average); //average when 0 is 65535, so it's invalid (dividing by zero - sum divided by top limit which are both zero)
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//but we don't even want the average. It's just for testing here.
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Serial.print("Sum Get!: ");
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Serial.println(sum); //this is what we care about
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//reset everything after a minute
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sum = 0;
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average = 0;
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x = 0;
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toplimit = 0;
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for (x=0; x<toplimit; x++){
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airreading[x] = 0;
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}
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starttime = millis();
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}
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}
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