Arduino Temperature Controlled Relay Module

//
//
//
//          Arduino Temperature Controlled Relay Module
//          by learnelectronics
//          4/12/2019
//          www.youtube.com/c/learnelectronics
//          email:[email protected]
//
//
//








#include <Wire.h>                                   //I2C LIBRARY FOR OLED
#include <Adafruit_GFX.h>                           //ADAFRUIT GRAPHICS LIBRARY
#include <Adafruit_SSD1306.h>                       //ADAFRUIT OLED DRIVER LIBRARY
#include <Adafruit_Sensor.h>
#include <DHT.h>


#define DHTPIN 6                                    //DHT11 SENSOR IS ON PIN 6
#define DHTTYPE    DHT11                            //TYPE OF SENSOR
#define OLED_RESET 4                                //REQUIRED FOR OLED LIBRARY






Adafruit_SSD1306 display(OLED_RESET);               //DEFINE THE OLED AS display
DHT dht(DHTPIN, DHTTYPE);                           //SETUP THE DHT11 SENSOR AS DHT ON PIN6 TYPE 11

void setup()   {
  Serial.begin(9600);                               //SERIAL COMMS FOR DEBUGGING
  pinMode(A0,INPUT);                                //DEFINE A0 AS AN INPUT
  pinMode(2,OUTPUT);                                //DEFINE D2 AS AN OUTPUT for relay 1
  pinMode(3,OUTPUT);                                //DEFINE D3 AS AN OUTPUT for relay 2
  pinMode(5,OUTPUT);                                //DEFINE D5 AS AN OUTPUT for relay 3 (cant use D4 - in use by OLED)
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);        //START UP THE OLED
  display.display();                                //SHOW BUFFER
  display.clearDisplay();                           //CLEAR BUFFER
  dht.begin();                                      //START READING DATA FROM THE DHT11




}


void loop() {

   float h = dht.readHumidity();                    //GRAB A HUMIDITY READING REL%
   float f = dht.readTemperature(true);             //GRAB A TEMP READING IN DEGRESS F(REMOVE "TRUE" FOR CELCIUS)


  display.clearDisplay();                           //CLEAR THE DISPLAY
  display.setTextSize(1);                           //SETUP OLED WITH TEXT SIZE OF 1
  display.setTextColor(WHITE);                      //SETUP OLED WITH COLOR WHITE
  display.setCursor(0,0);                           //SETUP OLED WITH CURSOR IN UPPER LEFT
  display.print("Temp:  ");                          //PRINT HEADING TO OLED BUFFER
  display.print(f);                                  //PRINT VALUE TO OLED BUFFER
  display.println("F");
  display.print("Humid: ");                          //PRINT HEADING TO OLED BUFFER
  display.print(h);                                  //PRINT VALUE TO OLED BUFFER
  display.println("%");
  display.println("------------");                  //PRINT A LINE TO OLED BUFFER
  display.println("");


   if (f < 63)                                      //CHECK IF TEMP IS LOWER THAN 63
      {
      digitalWrite(2,HIGH);                         //CLOSE RELAY 1
      digitalWrite(3,LOW);                          //OPEN RELAY 2
      display.setTextSize(2);                       //SET LARGE TEXT ON OLED
      display.println("Heat ON");                   //PRINT SYSTEM STATUS TO OLED BUFFER
      }
      else if (f > 70)                              //CHECK IF TEMP IS HIGHER THAN 70
      {
      digitalWrite(3,HIGH);                         //CLOSE RELAY 2(ON)
      digitalWrite(2,LOW);                          //OPEN RELAY 1(OFF)
      display.setTextSize(2);                       //SET LARGE TEXT ON OLED
      display.println("Cool ON");                   //PRINT SYSTEM STATUS TO OLED BUFFER
      }
      else if (f > 62 && f <69)                     //CHECK IF TEMP IS COMFORTABLE
      {

      digitalWrite(2,LOW);                          //OPEN RELAY 1
      digitalWrite(3,LOW);                          //OPEN RELAY 2
      display.setTextSize(2);                       //SET LARGE TEXT ON OLED
      display.println("Fan ON");                    //PRINT SYSTEM STATUS TO OLED BUFFER
      }

    if (h > 55)                                    //CHECK IF HUMIDITY IS HIGHER THAN 55
      {
      digitalWrite(5,HIGH);                        //CLOSE RELAY 1
      display.setTextSize(2);                      //SET LARGE TEXT ON OLED
      display.println("Fan ON");                   //PRINT SYSTEM STATUS TO OLED BUFFER
      }
    else if (h <55)                                 //CHECK IF HUMIDITY IS COMFORTABLE
      {
      digitalWrite(5,LOW);                          //OPEN RELAY 1
      }


  display.display();                                //SHOW WHATS IN THE OLED BUFFER
  delay(1500);                                       //WAIT 1.5S
  display.clearDisplay();                           //CLEAR THE DISPLAY



}