Relay control w/ grove sensors

//**********************************************************//
//*                                                        *//
//*                   Lotus board &                        *//
//*            Grove Sensor Temp Cntrl Relay               *//
//*                                                        *//
//*                by learnelectronics                     *//
//*                    7 APR 2020                          *//
//*           www.youtube.com/learnelectronics             *//
//*             email: arduino0169@gmail.com               *//
//*                                                        *//
//**********************************************************//



#include <DHT.h>                                                        //add DHT sensor library
#include <rgb_lcd.h>                                                    //add LCD library
#define DHTPIN 2                                                        //set digital pin2 as DHTPIN
#define DHTTYPE DHT11                                                   //set the sensor type as DHT 11

DHT dht(DHTPIN, DHTTYPE);                                               //assign dht as the name of DHT sensor, set the sensor pin as DHTPIN(pin2),set the sensor type as DHTTYPE(DHT11)

rgb_lcd lcd;                                                            //assign lcd as the name of rgb_lcd screen
 int myvar = 24;                                                        //Initial temp setting for relay

void setup() {

  dht.begin();                                                          //initialise the dht sensor
  lcd.begin(16, 2);                                                     //initialise the lcd screen; set up the lcd's number of columns and rows:
  pinMode(6,INPUT);
  pinMode(7,INPUT);
  pinMode(3,OUTPUT);
  Serial.begin(9600);                                                   //start serial comms for debugging
  digitalWrite(3,LOW);
  delay(2000);                                                          //wait for 2s
}

void loop() {

  int h = dht.readHumidity();                                           //store the humidity value to h
  int t = dht.readTemperature();                                        //store the temperature value to t(in Celsius)



  lcd.setCursor(0, 0);                                                  //set the LCD cursor to column 0, line 0
  lcd.print("Temp:");                                                   //Print text temperature: to the LCD
  lcd.setCursor(6, 0);                                                 //set the LCD cursor to column 12, line 0
  lcd.print(t);                                                         //Print temperature value t to the LCD
  lcd.write(223);                                                       //Print temperature º is character 223 on lookup table
  lcd.print(" Set:");
  lcd.print(myvar);
  lcd.setCursor(0, 1);                                                  //set the LCD cursor to column 0, line 1
  lcd.print("Hmdty: ");                                                //Print text Humidity: to the LCD
  lcd.setCursor(7, 1);                                                 //set the LCD cursor to column 10, line 1
  lcd.print(h);                                                         //Print humidity value h to the LCD
  lcd.print("%");                                                       //Print sign % to the LCD

  if (t>myvar){
  lcd.print("   ON ");
  digitalWrite(3,HIGH);
  }
  if (t<myvar){
    lcd.print("   OFF");
    digitalWrite(3,LOW);
  }
  delay(500);
  digitalRead(6);
  digitalRead(7);
  if (digitalRead(6)==0) myvar=myvar-1;
  if (digitalRead(7)==0) myvar=myvar+1;
}