Homie esp8266 arduino sketch for MHZ-16

homie-3-wemos-co2

#include <Homie.h>
#include <SoftwareSerial.h>


/***************************************************
* Infrared CO2 Sensor 0-50000ppm(Wide Range)
* ****************************************************
* The follow example is used to detect CO2 concentration.

* @author lg.gang(lg.gang@qq.com)
* @version  V1.0
* @date  2016-6-6

* GNU Lesser General Public License.
* See <http://www.gnu.org/licenses/> for details.
* All above must be included in any redistribution
* ****************************************************/

//Todo - Allow for warm up time of 3 minutes, recalibrate command?


SoftwareSerial mySerial(12, 13); // D6, D7 RX, TX
unsigned char hexdata[9] = {0xFF,0x01,0x86,0x00,0x00,0x00,0x00,0x00,0x79}; //Read the gas density command /Don't change the order

const int COLLECT_INTERVAL = 30;
unsigned long lastSent = 0;

const int PIN_LED = 13;
const int PIN_BUTTON = 0;

HomieNode airqNode("co2", "CO2", "co2");

void loopHandler() {
  if (millis() - lastSent >= COLLECT_INTERVAL * 1000UL || lastSent == 0) {
   Homie.getLogger() << "Collecting" << endl;
   mySerial.write(hexdata,9);
   Homie.getLogger() << "Collected" << endl;
   delay(500);

   for(int i=0,j=0;i<9;i++)
    {
      if (mySerial.available()>0)
        {
          Homie.getLogger() << "Data Received" << endl;
          long hi,lo,CO2;
          int ch=mySerial.read();

          if(i==2){     hi=ch;   }   //High concentration
          if(i==3){     lo=ch;   }   //Low concentration
          if(i==8) {
               CO2=hi*256+lo;
               airqNode.setProperty("ppm").send(String(CO2));
               Homie.getLogger() << String(CO2) << endl;
               lastSent = millis();
          }
        }
      }
   }
}

void setup() {
  Serial.begin(115200);
  Serial << endl << endl;  
  mySerial.begin(9600);

  Homie_setFirmware("wemos-mhz16", "0.0.1");

  airqNode.advertise("CO2").setName("CO2")
                                      .setDatatype("float")
                                      .setUnit("ppm");
  
  Homie.setLoopFunction(loopHandler);
  Homie.setup();
}


void loop() {
  Homie.loop();
}

I find I have a lot of wifi issues with the homie framework, and now primarily use Tasmota for esp8266 devices