#include <Wire.h>

int x = 0;
int sensorPin = 2;
int sensorValue = 0;

void setup() {
// Start the I2C Bus as Master
 pinMode(2, INPUT_PULLUP);
Wire.begin();
Serial.begin(9600);

}

void loop() {

sensorValue = digitalRead(sensorPin);
Serial.println(sensorValue);
Wire.beginTransmission(9);

// transmit to device #9

Wire.write(sensorValue);

delay(100);

Wire.endTransmission();

// stop transmitting

}