Arduino Sigfox: School Warden to Monitor the Environment

/* PROJECT: THE SCHOOL WARDEN WITH SIGFOX
 * AUTOR: LUIS ARENAS
 * EMAIL: WICHOMW3@HOTMAIL.COM
 * 
 */
#include <LiquidCrystal_I2C.h> // library for the I2C DISPLAY
#include<Wire.h> // library for the comunication by I2C

#define PIN_GUVAS12SD A2 // Pin al que se conecta el módulo con el UVM30A
#define ESPERA_ENTRE_LECTURAS 100 // Leer cada 100 ms // Read every 100 ms
#define ESPERA_ENTRE_PRESENTACIONES 10000 // Mostrar el índice cada 10 s // show every 10 seconds the average
#define CANTIDAD_INDICES_UV 12 // cuantity of UV levels *you can change it 
#define CANTIDAD_INDICES_CO2 6 // cuantity of CO2 levels *you can change it

LiquidCrystal_I2C lcd(0x3F,16,2); // define the I2C Direction (Direction in hexadecimal,witdh,height)


unsigned int lectura_sensor; //variable to read the analog value of uv sensor
unsigned int contador_lecturas=1; // counter of lectures for uv sensor
unsigned int contador_lecturas2=1; // counter of lectures for MQ135
float total_lecturas=0.0; // the sum of all lectures from uv sensor
float media_lecturas;   // keep the average from the uv sensor values
float total_lecturas_mq135=0.0; // the sum of all the lectures from MQ135
float media_lecturas_mq135; // the average form the MQ135 values
int valor_indice_uv[CANTIDAD_INDICES_UV]={0,210,295,378,467,563,646,738,818,907,1003,1022}; // ranges of Uv values from 0 to 11 * you can change it 
int valor_indice_CO2[CANTIDAD_INDICES_CO2]={0,8,11,16,19,23};  // ranges of CO2 from 0 to 6 * you can change it 
byte indice; // variable to keep the number of the array of UV
byte indice2; // variable to keep the number of the array of CO2
boolean buscando_indice_uv; // Varible that turns true when the average of uv is greater than some value of the uv array
boolean buscando_indice_CO2; // Varible that turns true when the average of CO2 is greater than some value of the CO2 array
long cronometro_lecturas; // take the time that has been passed between lectures
long cronometro_presentaciones; // take the time that has been passed when the info is showed
long tiempo_transcurrido; // take the time that have been passed

const int boton=6;//default pin for the boton just for this model
const int led=7; // default pin for the LED just for this model
char RespuestaSigfox[50]; // The String for the message
const int mq135=A0; // define the analog pin for the MQ135 sensor
const int mq8=A1; // define the analog pin for the MQ8 sensor

int sensor1=0; // variable to keep the value of MQ135 and add to the message for sigfox
int sensor2=0; //variable to keep the value of MQ8 and add to the message for sigfox
int sensor3=0; //variable to keep the value of UV and add to the message for sigfox

float sensor11=0; // variable to read the analog value of MQ135
float sensor22=0; // variable to read the analog value of MQ8

int ban=0;
long RO=68760; // value obtained by the operation with a rule of three with the video 
float RS_mq135=0; // value of the resistence S for MQ135
float RS_mq8=0; // value of the resistence S for MQ8
int ppm_mq135=0; // value of ppm for MQ135 * you can change it to long if you want
long ppm_mq8=0; // value of ppm for MQ8 
float var11; // value of divide RS from MQ8 with RO
float var22; // value of divide RS from MQ135 with RO

void setup() {
 
  Serial.begin(9600); // begin the port Serial in the arduino
  pinMode(boton, INPUT); // define the pin boton like input
  pinMode(7, OUTPUT);  // define the pin LED like output
  pinMode(mq135,INPUT); // define the analog pin for MQ135
  pinMode(mq8,INPUT);  // define the analog pin for MQ8
   //pinMode(PIN_GUVAS12SD,INPUT); // La lectura analógica no necesita inicialización
  lectura_sensor=analogRead(PIN_GUVAS12SD); // The first lecture is an error
  cronometro_lecturas=millis(); // wait one round of read to stabilize the sensor
  cronometro_presentaciones=millis();

   // define a welcome message
   lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("WELCOME");
  lcd.print(" SIGFOX");
  delay(3000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Processing info");
  lcd.setCursor(0,1);
  lcd.print("Please Wait...");
 }

void enviar_sigfox(int x, int y, int z) // this funtion converts he 3 values of the sensors to hexadecimal and add to the sigfox message to send it
{
  String cad1;
  String cad2;
  String cad3;
  String bufer="AT$SF=";
  char payload[20];
  Serial.print("Enviar/send: ");
  Serial.println(x);
  Serial.println(y);
  Serial.println(z);
  cad1=String(x, HEX);
  cad2=String(y, HEX);
  cad3=String(z, HEX);  
  //convierte el dato a bytes y lo agrega a nuestro mensaje a enviar
  String cadena;
  cadena=cad1+cad2+cad3;
  //str1=  String(sensor1, HEX);  
  Serial.println(cadena);
  bufer+=cadena;
  
  bufer.toCharArray(payload,16);
  //
  digitalWrite(7, HIGH);
  delay(1000);
  enviarcomandoATSigfox("AT");
  enviarcomandoATSigfox("AT$RC");
  enviarcomandoATSigfox(payload);
  digitalWrite(7, LOW);
}


void loop() {

  tiempo_transcurrido=millis()-cronometro_lecturas;
  
  if(tiempo_transcurrido>ESPERA_ENTRE_LECTURAS) // read every time that the millis pass the value stablish in the top
  {
    cronometro_lecturas=millis();
    lectura_sensor=analogRead(PIN_GUVAS12SD); // read the value of th esensor
    lectura_sensor=(lectura_sensor*1100)/225.06; // converts the value to de real value in volts from the sensor, because the sensor just reach lectures of 1.1 volts 

    //to calculate the value of MQ135
    sensor11=analogRead(mq135);
     sensor11=(sensor11*5.0)/1023.0;
     RS_mq135=1000*((5-sensor11)/sensor11);
     var22=RS_mq135/RO;
      ppm_mq135=5.0908*(pow(var22,-0.343));

          
    total_lecturas_mq135+=ppm_mq135; //to sum the value of MQ135 to a variable
    total_lecturas+=lectura_sensor; // to sum the valur of UV to a variable
    media_lecturas=total_lecturas/contador_lecturas++; //divade the sum of the value obtained with the count of readings 
    media_lecturas_mq135=total_lecturas_mq135/contador_lecturas2++; //divade the sum of the value obtained with the count of readings 
   
  }
  tiempo_transcurrido=millis()-cronometro_presentaciones;
  if(tiempo_transcurrido>ESPERA_ENTRE_PRESENTACIONES) // if the millist are greater than the time to prresente the total
  { // substract all the information of the ranges
    cronometro_presentaciones=millis();
    buscando_indice_uv=true;
    buscando_indice_CO2=true;
    indice=CANTIDAD_INDICES_UV;
    indice2=CANTIDAD_INDICES_CO2;
    while(buscando_indice_uv&&indice>0) // look for the value from the greatest to the lowest
    {
      indice--;
      if(media_lecturas>valor_indice_uv[indice]) // if the average is higher than that value readed
      {
        
        buscando_indice_uv=false;  //active the flag
      }
    }
    while(buscando_indice_CO2&&indice2>0) // if the average is higher than that value readed
    {
      indice2--;
      if(media_lecturas_mq135>valor_indice_CO2[indice2]) 
      {
        
        buscando_indice_CO2=false; // active the flag
      }
    }

    // if you want to see the values in the serial  monitor but if you are using sigfox you must be to desactivated
    /*Serial.print("Lectura sensor: "+String(media_lecturas,DEC));
    Serial.print(" (media de "+String(contador_lecturas,DEC)+")");
    Serial.print (" Lectura de mq135: "+String(media_lecturas_mq135,DEC)+"");
    Serial.print(" (media de "+String(contador_lecturas2,DEC)+")");
    Serial.print (" sensor de mq135: "+String(analogRead(mq135),DEC)+"");
    Serial.print (" sensor de mq8: "+String(analogRead(mq8),DEC)+"");
    Serial.println(" Índice UV: "+String(indice,DEC));
    Serial.println(" Índice CO2: "+String(indice2,DEC));
    */ 
//-----------------------------------------------------
    
     lcd.clear(); // clean the display
    sensor22=analogRead(mq8);
    sensor22=(sensor22*5.0)/1023.0; // transform the analog value into voltage by a rule of three
    RS_mq8=1000*((5-sensor22)/sensor22); // this operation is for obtain RS value - the value of 1000 is a constant obtained by the resisitence between  voltage and analog port
    var11=RS_mq8/RO; // a pre division of the final operation
    ppm_mq8=20163*(pow(var11,-1.438)); // this operation is the equation obtained by excel

   // show the results on the display
      lcd.setCursor(0,0); 
      lcd.print("CO2:");
      lcd.print((int)media_lecturas_mq135);

      lcd.setCursor(7,0);
      lcd.print("H:");
      lcd.print(ppm_mq8);

      lcd.setCursor(12,1);
      lcd.print((int)media_lecturas);
// this switch is for know the value of the place in the array of UV sensors
      switch (indice){
       case 1: 
              lcd.setCursor(0,1);
               lcd.print("LEVEL UV 1");
               sensor3=18;
               break;
        case 2:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 2");
               sensor3=19;
               break;
         case 3:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 3");
               sensor3=20;
               break;
         case 4:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 4");
               sensor3=21;
               break;
         case 5:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 5");
               sensor3=22;
               break;
          case 6:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 6");
               sensor3=23;
               break;
          case 7:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 7");
               sensor3=24;
               break;
          case 8:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 8");
               sensor3=25;
               break;
          case 9:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 9");
               sensor3=26;
               break;
          case 10:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 10!!");
               sensor3=27;
               break;
          case 11:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 11!!!");
               sensor3=28;
               break;
         case 0:
               lcd.setCursor(0,1);
               lcd.print("LEVEL UV 0");
               sensor3=17;
               break;      
      }
      // this switch is for know the place of the array of the MQ135 sensor
            switch (indice2){
       case 1: 
               sensor1=18;
               break;
        case 2:
              sensor1=19;
               break;
         case 3:
               sensor1=20;
               break;
         case 4:
               sensor1=21;
               break;
         case 5:
               sensor1=22;
               break;
         case 0:
               sensor1=17;
               break;      
      }
    // this part is for have a range for the MQ8 sensor
    if(ppm_mq8<300000){
    sensor2=17;
    }

    else if(ppm_mq8>300000 && ppm_mq8<360000){
      sensor2=17;
    }
    else if(ppm_mq8>450000 && ppm_mq8<850000){
      sensor2=18;
    }
    else if(ppm_mq8>950000 && ppm_mq8<1500000){
      sensor2=19;
    }
    else if(ppm_mq8>1500000){
      sensor2=19;
    }

    //restar the counters and the average for MQ135 and UV sensor
    contador_lecturas=1;
    contador_lecturas2=1;
    total_lecturas=0.0;
    total_lecturas_mq135=0.0;
  }








  
  if (digitalRead(boton)==LOW) // if the boton is pressed we send the values to sigfox
  {
    enviar_sigfox(sensor1,sensor2,sensor3);
    delay(2000);
  }
}

  void enviarcomandoATSigfox(char* comandoAT){ //tis funtion call the sigfox module to send the message 
  unsigned long x=0;
 while( Serial.available() > 0) Serial.read();
  x = 0;
  memset(RespuestaSigfox, '\0',sizeof(RespuestaSigfox)); 
  Serial.print(comandoAT);
  Serial.print("\r\n");
  while(true){
    if(Serial.available() != 0){   
      RespuestaSigfox[x] = Serial.read();
      x++;
      if (strstr(RespuestaSigfox, "\n") != NULL){
        break;
      }
    }
  }
}