My project

/* the master read temp,desirable temp and damper status from the slave
* turn on/off damper status from the slave.
* view on TFT (serial monitor) the temp,desirable temp and damper status
   * room[x].room_temperature
   * room[x].user_temperature
   * room[x].motor_damper_status
   * room[x].thermostat_power_status
   * x - number of room
*/

#include <TFT_ILI9341.h>
#include <SPI.h>
#define TFT_GREY 0x5AEB
TFT_ILI9341 tft = TFT_ILI9341(); // Invoke custom library

#include "thermostat.h" /* include class for each room thermostat
thermostat room[4]; /* define 5 room thermostat from [0] to [4], customize class in thermostat.h

// convert room number to words for facilities
#define one 0
#define two 1
#define three 2
#define  four 3
#define five 4

/* define I2C port for each room thermostat
   each one is a standalone ATMEGA328P connected by I2C
#define room1 2
#define room2 3
#define room3 4
#define room4 5
#define room5 6

#include "Wire.h"
#include <AnalogMatrixKeypad.h> // keypad library
#define analogPin 0 // keypad read,input pin
AnalogMatrixKeypad AnMatrixKeypad(analogPin); //define the keypad

#include "dampermotor.h" // add custom library to open or close room damper
#define motor_timeout 1500 // timeout for turning on or off the damper room for 3 sec

// define motor pins to driving for each rooms with the timeout
dampermotor motor_room1(2,3,motor_timeout);
dampermotor motor_room2(4,5,motor_timeout);
dampermotor motor_room3(6,7,motor_timeout);
dampermotor motor_room4(8,9,motor_timeout);
dampermotor motor_room5(10,11,motor_timeout);
dampermotor motor_bypass(12,13,motor_timeout);

#include "new_RTC.h" //add RTC code to display on the TFT
#include "check_keypad1.h" //add keypad code to check keypad choice with switch,case
#include "open_close_room_damper_by_temp1.h" //add damper code to open or close room's damper by room temperature

// define pins for TFT screen
#define sclk 52  // Don't change
#define mosi 51  // Don't change
#define miso 50
#define cs   9
#define dc   8
#define rst  7  // you can also connect this to the Arduino reset

// read from keypad
void presskeypad()
{
  Key = AnMatrixKeypad.readKey();
  if(Key != KEY_NOT_PRESSED)
  {
  Serial.println(Key); // send pressed key to serial monitor
  }
}

// Master write to Slave, send data to Slave
void write_to_slave(int slave_number, int desirable_temp, boolean mode)
{
  Wire.beginTransmission(slave_number); // start data transmission to device #slave_number
  Wire.write(desirable_temp); // send one byte
  Wire.write(mode); // send one byte
  Wire.endTransmission(); // stop transmitting
}

 // Master reade form Slave device <number>, from room[number][i]
void reader_form_slave(int device,int room_number)
{
 Wire.requestFrom(device,4);    //request 4 bytes from device <number>
 while(Wire.available())    // slave may send less than requested
 {
  for(int i=0;i<4;i++)
  {
   int t;
   t = Wire.read(); // receive a byte as character
   room[room_number].room_temperature=t;
   t = Wire.read();
   room[room_number].user_temperature=t;
   t = Wire.read();
   room[room_number].motor_damper_status=t;
   t = Wire.read();
   room[room_number].thermostat_power_status=t;
  }
 }
}

// Delay for 5min.
 void standby()
 {
  while(end_mode_timer - start_mode_timer <= 1000) // 300000 millis for 5min standby before changing mode
  {
  end_mode_timer=millis();
  }
 }

void setup()
{
 Wire.begin();
 Serial.begin(9600);
 // start the TFT screen
 tft.init();
 tft.setRotation(3);
 tft.fillScreen(TFT_BLACK);
}

void loop()
{
  //motor_room1.damper_motor_driver();
  //motor_room2.damper_motor_driver();
  //motor_room3.damper_motor_driver();
  //motor_room4.damper_motor_driver();
  //motor_room5.damper_motor_driver();
  //motor_bypass.damper_motor_driver();
  //reader_form_slave(room1,one); //receive data from room1
  //reader_form_slave(room2,two); //receive data from room2
  //reader_form_slave(room3,three); //receive data from room3
  //reader_form_slave(room4,four); //receive data from device room4
  //reader_form_slave(room5,five); //receive data from device room5
  presskeypad(); //read from keypad
  checkeypad(); // check the key pressed and do something
  displayTime(); //read and display from RTC
  //open_close_room_damper_by_temp(); // open or close room's damper by room's thermostat temperature
}