#include <Wire.h>
#define pinr 4
byte data[1];

void setup() {
  pinMode(pinr,INPUT);
  Wire.begin(60);             //Start communication with the i2c bus at address 60
  Wire.onRequest(requestEvent);//Request event that is executed when master needs 
}

void loop() {
  data[0]=!digitalRead(pinr); //Assign digital input to data[0]
  delay(100);                 //Delay of 100 ms
}

void requestEvent() {
   Wire.write(data, 1);       //Send the the data value to master
}