#include<SPI.h>                             //Library for SPI 
#define LED 7           
#define button 2
#define buzzer 4
int buttonvalue;
int x;
void setup ()
{
  Serial.begin(115200);                   //Starts Serial Communication at Baud Rate 115200 
  
  pinMode(button,INPUT);                //Sets pin 2 as input 
  pinMode(LED,OUTPUT);                    //Sets pin 7 as Output
  pinMode(buzzer, OUTPUT);                // Sets pin 7 as Output
  
  SPI.begin();                            //Begins the SPI commnuication
   SPI.setClockDivider(SPI_CLOCK_DIV8);    //Sets clock for SPI communication at 8 (16/8=2Mhz)
  digitalWrite(SS,HIGH);                  // Setting SlaveSelect as HIGH (So master doesnt connnect with slave)
}
void loop()
{
  byte Mastersend,Mastereceive;          
  buttonvalue = digitalRead(button);   //Reads the status of the pin 2
  if(buttonvalue == HIGH)                //Logic for Setting x value (To be sent to slave) depending upon input from pin 2
  {
    x = 1;
  }
  else
  {
    x = 0;
  }
  
  digitalWrite(SS, LOW);                  //Starts communication with Slave connected to master
  
  Mastersend = x;                            
  Mastereceive=SPI.transfer(Mastersend); //Send the mastersend value to slave also receives value from slave
  
  if(Mastereceive == 1)                   //Logic for setting the LED output depending upon value received from slave
  {
    digitalWrite(LED,HIGH);
    Serial.println("Master LED ON");
    digitalWrite(buzzer, HIGH);
    Serial.println("Master buzzer ON");
    delay(5000);
  }
  else
  {
   digitalWrite(LED,LOW);               //Sets pin 7 LOW
   Serial.println("Master LED OFF");
   digitalWrite(buzzer, LOW);
   Serial.println("Master buzzeR OFF");
  }
delay(50);
}
#include<SPI.h>
#define LEDpin 7
#define buttonpin 2
volatile boolean received;
volatile byte Slavereceived,Slavesend;
int buttonvalue;
int x;
void setup()
{
  Serial.begin(9600);
  
  pinMode(buttonpin,INPUT);               // Setting pin 2 as INPUT
  pinMode(LEDpin,OUTPUT);                 // Setting pin 7 as OUTPUT
  pinMode(MISO,OUTPUT);                   //Sets MISO as OUTPUT (Have to Send data to Master IN 
  SPCR |= _BV(SPE);                       //Turn on SPI in Slave Mode
  received = false;
  SPI.attachInterrupt();                  //Interuupt ON is set for SPI commnucation
  
}
ISR (SPI_STC_vect)                        //Inerrrput routine function 
{
  Slavereceived = SPDR;         // Value received from master if store in variable slavereceived
  received = true;                        //Sets received as True 
}
void loop()
{ if(received)                            //Logic to SET LED ON OR OFF depending upon the value recerived from master
   {
      if (Slavereceived==1) 
      {
        digitalWrite(LEDpin,HIGH);
        Serial.println("Slave LED ON");
      }else
      {
        digitalWrite(LEDpin,LOW);          //Sets pin 7 as LOW LED OFF
        Serial.println("Slave LED OFF");
      }
      
      buttonvalue = digitalRead(buttonpin);  // Reads the status of the pin 2
      
      if (buttonvalue == HIGH)               //Logic to set the value of x to send to master
      {
        x=1;
        
      }else
      {
        x=0;
      }
      
  Slavesend=x;                             
  SPDR = Slavesend;                           //Sends the x value to master via SPDR 
  delay(500);
}
}
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