обнов очка

void loop() {
  // put your main code here, to run repeatedly:


if (Serial.available()>0) {
    s=Serial.read();
    Serial.println(s,HEX);
    buf[i] = s;
    i++;
  }

  if(i==3)
  {
    Serial.write(0xA1);
    Serial.write(0xF1);
    Serial.println("5");
    Serial.write(buf[0]);
    Serial.write(buf[1]);
    Serial.write(buf[2]);
    Serial.println("6");
    Serial.println(buf[0],HEX);
    Serial.println(buf[1],HEX);
    Serial.println(buf[2],HEX);
    i=0;
    buf[i]=0;
}
}