MakerUno Oxygen Sensor With Blynk

MakerUnoO2Sensor.ino

#include <Wire.h>
#include "rgb_lcd.h"
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>

#include <SoftwareSerial.h>
SoftwareSerial EspSerial(6, 7); // RX, TX

char auth[] = "djigt1lMWzPmqbppsEDxk6uUFNeLzf-C";

// Set password to "" for open networks.
char ssid[] = "hotspot";
char pass[] = "hotspot123";

// Your ESP8266 baud rate:
#define ESP8266_BAUD 115200

ESP8266 wifi(&EspSerial);

// Grove - Gas Sensor(O2) test code
// Note:
// 1. It need about about 5-10 minutes to preheat the sensor
// 2. modify VRefer if needed
 
const float VRefer = 3.3;       // voltage of adc reference
 
const int pinAdc   = A0;

rgb_lcd lcd;

const int colorR = 255;
const int colorG = 0;
const int colorB = 0;


void setup() 
{
    // set up the LCD's number of columns and rows:
    lcd.begin(16, 2);
    
   // lcd.setRGB(colorR, colorG, colorB);
    
    // Print a message to the LCD.
    lcd.print("Oxygen Level");
    lcd.setCursor(0, 1);
    lcd.print("Monitoring");

    delay(1000);

    // Open the connection at 115200
  EspSerial.begin(115200);
  EspSerial.println("AT");

  Blynk.begin(auth, wifi, ssid, pass);
}

void loop() 
{

    Blynk.run();
    
    lcd.clear();
    lcd.setCursor(0, 0);
    float Vout =0;
    Vout = readO2Vout();
    lcd.print("Vout : ");
    lcd.print(Vout);
    lcd.setCursor(0, 1);
    lcd.print("O2% : ");
    lcd.print(readConcentration());
    
    Blynk.virtualWrite(V1, readConcentration());
    //delay(1000);
    delay(100);
}


float readO2Vout()
{
    long sum = 0;
    for(int i=0; i<32; i++)
    {
        sum += analogRead(pinAdc);
    }
 
    sum >>= 5;
 
    float MeasuredVout = sum * (VRefer / 1023.0);
    return MeasuredVout;
}
 
float readConcentration()
{
    // Vout samples are with reference to 3.3V
    float MeasuredVout = readO2Vout();
 
    //float Concentration = FmultiMap(MeasuredVout, VoutArray,O2ConArray, 6);
    //when its output voltage is 2.0V,
    float Concentration = MeasuredVout * 0.21 / 2.0;
    float Concentration_Percentage=Concentration*100;
    return Concentration_Percentage;
}
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