#include "TinyWireS.h"                  // wrapper class for I2C slave routines
#define I2C_SLAVE_ADDR  0x26            // i2c slave address (38)
#define LED1_PIN         1              // ATtiny Pin 1
#define LED2_PIN         2              // ATtiny Pin 2
#define Button_PIN 0 

void setup(){
  pinMode(LED1_PIN,OUTPUT);            
  pinMode(LED2_PIN,OUTPUT);             
  pinMode(LED2_PIN,OUTPUT);            
  TinyWireS.begin(I2C_SLAVE_ADDR);      // init I2C Slave mode
}
void loop(){
 byte byteRcvd = 0;
 if (TinyWireS.available())
 {         
    byteRcvd = TinyWireS.receive();     // get the byte from master
    byteRcvd += 10;                     // add 10 to what's received
    TinyWireS.send(byteRcvd);           // send it back to master
        if(byteRcvd != 0 && digitalRead(Button_PIN) == HIGH)
        {
          digitalWrite(1, HIGH);     //red led= receive
        }
      else digitalWrite(1,LOW);
 }
}