#include <Wire.h>
#define I2C_Secondary_ADDRESS 0x9
void setup() {
  Serial.begin(9600);
  Wire.begin(I2C_Secondary_ADDRESS);
  Wire.onReceive(receiveEvent);
  pinMode(1, OUTPUT);
}

void loop() {
}
void receiveEvent(int howMany) {
  String data = "";
  while (Wire.available()) {
    data += (char)Wire.read();
  }
  if (data.equals("On")) {
    digitalWrite(1, HIGH);
  }
  else if(data.equals("Off")) {
      digitalWrite(1, LOW);
    }

  Serial.println(data);
}