#include <Wire.h>

#define SLAVE_ADDR 0x26

void setup(){
  Wire.begin();                            // join bus as master
  Serial.begin(38400);
  Serial.println("I2C Test Application");
}

void loop(){
  Serial.println("Send command");

  Wire.beginTransmission(SLAVE_ADDR);      // slave adress that will receive data
  Wire.write(0xDE);                        // send data
  Wire.endTransmission();                  // stop transmission

  delay(5000);                            // wait
}