SENSOR TURBIDEZ

 #include <Wire.h>       // Library to communication I2C

#include <Adafruit_GFX.h>  //Library to control the OLED display

#include <Adafruit_SSD1306.h>  // Library to OLED SSD1306

#include <OneWire.h> //Library to communication with to the water temperature sensor DS18B20

#include <DallasTemperature.h> //Lybrary to control the water temperature sensor DS18B20

//Start the configurations of sensors and actuator

OneWire ourWire(4); //Indicate the pin 4 to ESP32 for reading of sensor DS18B20

DallasTemperature DS18B20(&ourWire); //Decalre the variable or object for the sensor.

Adafruit_SSD1306 display(128, 64, &Wire);

int sensorPin = 34;  // Pin of ESP32 for reading of the turbidity sensor.

int NTU; //Variable to save the turbidity

float temp; //Variable to save the water temperatura

void setup()

{

  Serial. begin(115200); // Start the serial monitor and the respective baudios.  

  Wire.begin();                                   //Start the communication I2C to the OLED  

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);     // Start the OLED and the direction 0x3C

  display.clearDisplay();                       // Clear the OLED

  DS18B20.begin(); //Start the water sensor DS18B20

}

void loop(){

Readturbidity ();     //Go to the function that read the turbidity

displayturbidity (); // Go to the fuction that show the NTU on the OLED

ReadTempWater ();     // Go to the function that read the water temperature

displayTempWater (); // Go to the function that show the water temperature on the OLED

}

void Readturbidity ()

{

  int reading = analogRead(sensorPin); // Save the analog value from the turbidity sensor

  float voltage = reading * (3.3 / 4095.0); // Scale the digital value to voltage 3.3V with the 12bits resolution

  // NTU(V)≈343.2V2−1446.2V+1523.6 This it the polynomial that represents the turbidity in the water

  NTU = (343.2*(voltage*voltage) - 1446.2*voltage + 1523.6); // Make the polynomial replacing the voltage

  if (NTU < 0) NTU = 0; // Avoid the negatives values

 

   // Show in the setrial monitor

  Serial.print("Pin Reading: "); Serial.print(reading);

  Serial.print("  Voltage: "); Serial.print(voltage);

  Serial.print(" V  NTU: "); Serial.print(NTU); Serial.print("\n");

  delay (2000);

}

void displayturbidity ()

{

  display.clearDisplay();

  display.setTextSize(1,2);

  display.setTextColor(WHITE);

  display.setCursor(34,2);

  display.println("Turbidity");

   display.setTextSize(3);

  display.setCursor(29,20);

  display.println(NTU);

  display.setTextSize(3);

  display.setCursor(32,44);

  display.println("NTU");

  display.display();

  delay(3000);

}

void ReadTempWater ()

{

DS18B20.requestTemperatures(); //Send the command to read the temperature

temp= DS18B20.getTempCByIndex(0); //Obtain the temperature in ºC

Serial.print("Temperature= ");

Serial.print(temp);

Serial.println(" °C");

delay(1000);

}

void displayTempWater ()

{

  display.clearDisplay();

  display.setTextSize(1,2);

  display.setTextColor(WHITE);

  display.setCursor(34,2);

  display.println("Temperature");

   display.setTextSize(3);

  display.setCursor(21,20);

  display.println(temp);

  display.setTextSize(1);

  display.setCursor(0,44);

  display.print((char)247); // degree symbol

  display.println("C Degree Celcius");

  display.display();

  delay(3000);

}