#include <Wire.h>
int LED = 13;
int x = 0;
void setup() {
pinMode (LED, OUTPUT);// LED pin as Output
Wire.begin(1); // Start I2C as Slave on address 1
Wire.onReceive(receiveEvent);// trigger when something is received.
} void receiveEvent(int bytes) {
x = Wire.read(); // read character from I2C
}
void loop() {
if (x == 1) {
digitalWrite(LED, HIGH);

}
else {
digitalWrite(LED, LOW);
}
}