 void setup() 
 {
   first_start = 0;
-  strcpy(firmware_version, "2016.02.20.3s");
+  strcpy(firmware_version, "2016.02.20.4");
   
   current_buffer[0] = 0;
 

                    sprintf(serial_out, "GU%d %d %d#", ultrasound_index, trig_pin, echo_pin);
                    i += 4;
                  }
        }
        else
         if (tmp_str[i] == 'T' || tmp_str[i] == 't'){// test connection

                 sprintf(serial_out, "CI#");
                 i += num_consumed_total;
               }
               else
                 i++; // incomplete string
         }
         else
           i++;// incomplete string
    }
    else
      i++;
