#include <Wire.h>

    TwoWire I2C1 = TwoWire(1);

    void setup() {
      I2C1.begin(14,12,400000); // SDA pin 14, SCL pin 12, 400kHz frequency
    }

    void loop() {
      I2C1.beginTransmission(0x42);
      I2C1.write(140);
      I2C1.endTransmission();
      delay(100);
    }