Green Box: Fully Automated at Home Hydroponics System

#include <SHT1x.h> //fan library
#include <math.h>

//general define
char ID = 0;
String CMD = "";
int subID = 0;
bool split = false;

//light 
int percent = 0;

int relay1 = 22;
int relay2 = 23;
int relay3 = 24;
int pinBright = 2;
//

//fan - Specify data and clock connections and instantiate SHT1x object
#define dataPin  10
#define clockPin 11
SHT1x sht1x(dataPin, clockPin);
//Inital value
float Temperature = 0.0;
float Humidity = 0.0;

bool fanauto = false;

int relay4 = 25; 
int relay5 = 26; 
int relay6 = 27;
int relay7 = 28;
//

//water level 
bool waterlevelauto = false; 

const int trigPin = 6;
const int echoPin = 7;

long duration;
int distance;
int water_max = 15;
int water_level = 0;

int inputWL = 0;

int relay8 = 29;
int relay9 = 30;
//

//air pump 
int relay10 = 31;
//

// nutrient pump 
bool circularauto = false;
//

//data collection (to monitor)
float temp = 0.0;
float humi = 0.0; 
String pH = "";
//

void setup() 
{
  Serial.begin (9600);
  Serial1.begin (9600);
  Serial2.begin (9600);
  Serial2.begin (9600);
  CMD.reserve(20);

  pinMode (relay1, OUTPUT);
  pinMode (relay2, OUTPUT);
  pinMode (relay3, OUTPUT);
  pinMode (pinBright, OUTPUT);
  pinMode (relay4, OUTPUT);
  pinMode (relay5, OUTPUT);
  pinMode (relay6, OUTPUT);
  pinMode (relay7, OUTPUT);
  pinMode (relay8, OUTPUT);
  pinMode (relay9, OUTPUT);
  pinMode (relay10, OUTPUT);
  pinMode (trigPin, OUTPUT);
  pinMode (echoPin, INPUT); 
}

void loop() 
{
   temp = sht1x.readTemperatureC();
   humi = sht1x.readHumidity();
   Round_Temperature(temp);
   Serial2.print ('R');
   Serial2.print ('\r');
   delay (1000);
   pH = Serial2.readStringUntil(13);
   Serial2.readStringUntil(13);
   
   digitalWrite(trigPin, LOW);
   delayMicroseconds(2);
   digitalWrite(trigPin, HIGH);
   delayMicroseconds(10);                // Sets the trigPin on HIGH state for 10 micro seconds
   digitalWrite(trigPin, LOW);
   duration = pulseIn(echoPin, HIGH);    // Reads the echoPin, returns the sound wave travel time in microseconds
   distance = duration*0.034/2;          // Calculating the distance
   water_level = water_max-distance;
   
   Serial.print ("Temperature: ");
   Serial.print (temp);
   Serial.print ("C || ");
   Serial.print ("Humidity: ");
   Serial.print (humi);
   Serial.print ("% || ");
   Serial.print ("pH: ");
   Serial.print (pH);
   Serial.print (" || ");
   Serial.print ("Water Level: ");
   Serial.print (water_level);
   Serial.println ("cm ");


   delay (3000);
  
  if (fanauto == true)
  {
    Temperature = sht1x.readTemperatureC();
    Humidity = sht1x.readHumidity();
    Round_Temperature(Temperature);
    
    if (Temperature >= 28)
    {
      digitalWrite (relay7, HIGH);
    }
    if (Temperature < 28)
    {
      digitalWrite (relay7, LOW);
    }
  }

  if (waterlevelauto == true)
  {
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);                // Sets the trigPin on HIGH state for 10 micro seconds
    digitalWrite(trigPin, LOW);
    
    duration = pulseIn(echoPin, HIGH);    // Reads the echoPin, returns the sound wave travel time in microseconds
    distance = duration*0.034/2;          // Calculating the distance
    water_level = water_max-distance;


    if (water_level < inputWL) 
    {
      digitalWrite (relay8, HIGH);
      digitalWrite (relay9, LOW);
    }
    if (water_level > inputWL) 
    {
      digitalWrite (relay8, LOW);
      digitalWrite (relay9, HIGH); 
    }
  }

  if (circularauto == true)
  {
    digitalWrite (relay8, HIGH);
    digitalWrite (relay9, HIGH);
  }
  if (circularauto == false)
  {
    digitalWrite (relay8, LOW);
    digitalWrite (relay9, LOW);
  }
  
}

void Round_Temperature(float input_temp)
{
  input_temp = input_temp*100;
  input_temp = round(input_temp);
  input_temp = input_temp*0.01;
}

void serial3Event() 
{
  while (Serial3.available()) 
  {
    char inChar = (char)Serial3.read();//receive one byte
    if(inChar==',')
    {
      split = true;
    }
    if(split==false)//split char before ','
    {
      ID = inChar;
    }
    if(split==true)//split char after ','
    {
      if(inChar!=',' & inChar!='.')
      {
        CMD += inChar;
      }
    }
    if (inChar == '.') 
    {
      switch(ID)
      {
        case 'L': //lights
        {
          if (CMD == "A") //auto mode 
          {
            digitalWrite (relay1, LOW); 
            digitalWrite (relay2, LOW);
            digitalWrite (relay3, LOW);
          } 
          if (CMD == "S") //switch mode
          {
            digitalWrite (relay1, HIGH);
            digitalWrite (relay2, HIGH);
            digitalWrite (relay3, LOW);
          }
          if (CMD == "RO") //remote mode 
          {
            digitalWrite (relay1, HIGH);
            digitalWrite (relay2, LOW);
            digitalWrite (relay3, HIGH);
          }
          if (CMD == "RF") 
          {
            digitalWrite (relay1, HIGH);
            digitalWrite (relay2, LOW);
            digitalWrite (relay3, LOW);
          }
        }
        break;
        
        case 'B': //brightness
        {
          percent = CMD.toInt() ;
          percent = (percent * 2.25);
          analogWrite (pinBright, percent); 
        }
        break;

        case 'F': //fan
        {
          if (CMD == "A")
          {
            fanauto = true;
          }
          if (CMD == "S") //Switch Mode
          {
            digitalWrite (relay4, HIGH);
            digitalWrite (relay5, HIGH);
            digitalWrite (relay6, LOW);
            fanauto = false;
          }
          if (CMD == "RO")
          {
            digitalWrite (relay4, HIGH);
            digitalWrite (relay5, LOW);
            digitalWrite (relay6, HIGH);
            fanauto = false;
          }
          if (CMD == "RF")
          {
            digitalWrite (relay4, HIGH);
            digitalWrite (relay5, LOW);
            digitalWrite (relay6, LOW);
            fanauto = false;
          }
        }
        break;
          
        case 'N':
        {
            circularauto = true;
            Serial1.print ("D," + CMD);
            Serial1.print ('\r');
            waterlevelauto = false;

            if (CMD == "S")
            {
              circularauto = false;
            }
        }
        break;
        
        case 'W': //water level
        {
            inputWL = CMD.toInt ();
            if (inputWL >= 5 & inputWL <= 14)
            {
              waterlevelauto = true;
            }
            
            if (inputWL < 5) 
            {
              Serial.println ("Invalid water level: must be between 5 and 14 cm");
              digitalWrite (relay8, HIGH);
              digitalWrite (relay9, LOW);
            }
            if (inputWL > 14)
            {
              Serial.println ("Invalid water level: must be between 5 and 14 cm");
              digitalWrite (relay8, LOW);
              digitalWrite (relay9, HIGH);
            }
        }
        break;

        case 'P': //water pump 
        {
          if (CMD == "O")
          {
            digitalWrite (relay9, HIGH);
          }
          if (CMD == "F")
          {
            digitalWrite (relay9, LOW);
          }
        }
        break;

        case 'V': //valve 
        {
          if (CMD == "O")
          {
            digitalWrite (relay8, HIGH);
          }
          if (CMD == "F")
          {
            digitalWrite (relay8, LOW);
          }
        }
        break;

        case 'A': //airpump 
        {
          if (CMD == "O")
          {
            digitalWrite (relay10, HIGH);
          }
          if (CMD == "F")
          {
            digitalWrite (relay10, LOW);
          }
        }
        break;

        default:
        break;
      }
      split = false;        //reset value
      ID = 0;               //reset value
      CMD = "";             //reset value
    }
  }
}