AquaticTechTank.net

#include <kSeries.h>

/* Reports values from a K-series sensor back to the computer written by Jason Berger Co2Meter.com
*/
int pin = 8;

kSeries K_30(12,13); //Initialize a kSeries Sensor with pin 12 as Rx and 13 as Tx
void setup()
{
    Serial.begin(9600); //start a serial port to communicate with the computer
    pinMode(pin, OUTPUT);
}

void loop()
{
  double co2 = K_30.getCO2('p'); //returns co2 value in ppm ('p') or percent ('%')
 
  //there's a glitch sometimes with the sensor output
  if(co2 >= 0 && co2 <= 10000) {
      co2 = co2 * 0.8317 * 44.01 / 10000;
      //   converts ppmv to ppmw
      //  quicker than co2/1000000 * 0.8317 * 44.01 / 1000000
      //  0.8317 accounts for Henry's Law
      // max ppmw will be 36.6 with 10,000 ppmv

      //raise from 0 to 36... writes every loop
      if ( co2 < 36 ) {
          digitalWrite(pin, HIGH);
      } else {
          digitalWrite(pin, LOW);

      }
   
  }
 
  Serial.println(co2);   //print value
  delay(1500);   //wait 1.5 seconds

}