#include <Arduino.h>
#include <I2C_Slave.h>



#define I2C_ADDR 0x09  // unused address (https://i2cdevices.org/addresses)
#define SERIAL_BAUD 9600


void setup() { 
    Slave.begin(I2C_ADDR);
    Serial.begin(SERIAL_BAUD);

}

void loop() {
    int number = 42;
    Slave.writeRegisters(number);
    delay(100);  // update at 10Hz
}