// Include Arduino Wire library for I2C
#include <Wire.h>
 
// Define Slave I2C Address
#define SLAVE_ADDR 9
 
// Define LED Pin
int LED = 13;
 
// Variable for received data
int rd;
 
// Variable for blink rate
int br;
 
void setup() {
 
  pinMode(LED, OUTPUT);
  
  // Initialize I2C communications as Slave
  Wire.begin(SLAVE_ADDR);
   
  // Function to run when data received from master
  Wire.onReceive(receiveEvent);
  
  // Setup Serial Monitor 
  Serial.begin(9600);
  Serial.println("I2C Slave Demonstration");
}
 
 
void receiveEvent() {
  // read one character from the I2C
  rd = Wire.read();
  // Print value of incoming data
  Serial.println(rd);
    
}
void loop() {
   delay(50);
 
  // Calculate blink value
  br = map(rd, 1, 255, 100, 2000);
 
  digitalWrite(LED, HIGH);
  delay(br);
  digitalWrite(LED, LOW);
  delay(br);
 
}