Thank you for clarification, I have switched in Arduino IDE Processor to 8MHz and I can see the the serial console messages correctly now.

BTW: can you point me to the right place how to reprogram fuses?

I just received new SensebenderGateway, but don't know how to make gateway using radio and wifi - is there any example how to connect it to SensebenderGateway?

Also I will be thankful for any example sketch how to use those modules with SensebenderGateway.

Thank you.

Do you have any example sketch for this gateway? I want to use in my GW radio + wifi module.

@tbowmo great answer! I agree, you are right, it has no sense to change frequency in my case. I want to measure temperature each few minutes and than sleep ...

Thank you for clarification, I have switched in Arduino IDE Processor to 8MHz and I can see the the serial console messages correctly now.

BTW: can you point me to the right place how to reprogram fuses?

I was able to upload scetch to my Sensebender Micro (1MHz) board, but I'm not able to read from console.
I read, that it is related to baud rate of console - I have tried to change the baud rate to many possible values, but none worked yet.

Could somebody help to identify my problem?

Here is the code:

#include <Wire.h>
#include "i2c.h"

#include "i2c_SI7021.h"
SI7021 si7021;


void setup()
{
    Serial.begin(9600);

    Serial.print("Probe SI7021: ");
    if (si7021.initialize()) {
      Serial.println("Sensor found!");
    } else {
        Serial.println("Sensor missing");
        while(1) {};
    }
}

void loop()
{
    static float humi, temp;

    si7021.getHumidity(humi);
    si7021.getTemperature(temp);
    si7021.triggerMeasurement();

    Serial.print("TEMP: ");
    Serial.print(temp);
    Serial.print(" HUMI: ");
    Serial.print(humi);
    Serial.println("");

}

/**<

Program size:
A1.0.5: 6896b
A1.5.7: 6590b
A1.6.3: 6484b / 499b
 */

Here is output I see:

This is what I see during compilation and uploading:

/Applications/Arduino.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /Applications/Arduino.app/Contents/Java/hardware -hardware /Users/viktor/Library/Arduino15/packages -tools /Applications/Arduino.app/Contents/Java/tools-builder -tools /Applications/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/viktor/Library/Arduino15/packages -built-in-libraries /Applications/Arduino.app/Contents/Java/libraries -libraries /Users/viktor/Documents/Arduino/libraries -fqbn=MySensors:avr:MysensorsMicro:cpu=1Mhz -ide-version=10801 -build-path /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688 -warnings=none -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Applications/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/Applications/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/Applications/Arduino.app/Contents/Java/hardware/tools/avr -verbose /Users/viktor/Documents/Arduino/i2c_SI7021-2/i2c_SI7021-2.ino
/Applications/Arduino.app/Contents/Java/arduino-builder -compile -logger=machine -hardware /Applications/Arduino.app/Contents/Java/hardware -hardware /Users/viktor/Library/Arduino15/packages -tools /Applications/Arduino.app/Contents/Java/tools-builder -tools /Applications/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/viktor/Library/Arduino15/packages -built-in-libraries /Applications/Arduino.app/Contents/Java/libraries -libraries /Users/viktor/Documents/Arduino/libraries -fqbn=MySensors:avr:MysensorsMicro:cpu=1Mhz -ide-version=10801 -build-path /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688 -warnings=none -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Applications/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/Applications/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/Applications/Arduino.app/Contents/Java/hardware/tools/avr -verbose /Users/viktor/Documents/Arduino/i2c_SI7021-2/i2c_SI7021-2.ino
Using board 'MysensorsMicro' from platform in folder: /Users/viktor/Library/Arduino15/packages/MySensors/hardware/avr/1.0.1
Using core 'arduino' from platform in folder: /Applications/Arduino.app/Contents/Java/hardware/arduino/avr
Detecting libraries used...
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=1000000L -DARDUINO=10801 -DARDUINO_AVR_MICRO8 -DARDUINO_ARCH_AVR   "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Users/viktor/Library/Arduino15/packages/MySensors/hardware/avr/1.0.1/variants/micro" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/sketch/i2c_SI7021-2.ino.cpp" -o "/dev/null"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=1000000L -DARDUINO=10801 -DARDUINO_AVR_MICRO8 -DARDUINO_ARCH_AVR   "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Users/viktor/Library/Arduino15/packages/MySensors/hardware/avr/1.0.1/variants/micro" "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/Wire/src" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/sketch/i2c_SI7021-2.ino.cpp" -o "/dev/null"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=1000000L -DARDUINO=10801 -DARDUINO_AVR_MICRO8 -DARDUINO_ARCH_AVR   "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Users/viktor/Library/Arduino15/packages/MySensors/hardware/avr/1.0.1/variants/micro" "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/Wire/src" "-I/Users/viktor/Documents/Arduino/libraries/I2C-Sensor-Lib_iLib/src" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/sketch/i2c_SI7021-2.ino.cpp" -o "/dev/null"
Using cached library dependencies for file: /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/Wire/src/Wire.cpp
Using cached library dependencies for file: /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/Wire/src/utility/twi.c
Using cached library dependencies for file: /Users/viktor/Documents/Arduino/libraries/I2C-Sensor-Lib_iLib/src/i2c.cpp
Generating function prototypes...
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=1000000L -DARDUINO=10801 -DARDUINO_AVR_MICRO8 -DARDUINO_ARCH_AVR   "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Users/viktor/Library/Arduino15/packages/MySensors/hardware/avr/1.0.1/variants/micro" "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/Wire/src" "-I/Users/viktor/Documents/Arduino/libraries/I2C-Sensor-Lib_iLib/src" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/sketch/i2c_SI7021-2.ino.cpp" -o "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/preproc/ctags_target_for_gcc_minus_e.cpp"
"/Applications/Arduino.app/Contents/Java/tools-builder/ctags/5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/preproc/ctags_target_for_gcc_minus_e.cpp"
Compiling sketch...
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -mmcu=atmega328p -DF_CPU=1000000L -DARDUINO=10801 -DARDUINO_AVR_MICRO8 -DARDUINO_ARCH_AVR   "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Users/viktor/Library/Arduino15/packages/MySensors/hardware/avr/1.0.1/variants/micro" "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/Wire/src" "-I/Users/viktor/Documents/Arduino/libraries/I2C-Sensor-Lib_iLib/src" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/sketch/i2c_SI7021-2.ino.cpp" -o "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/sketch/i2c_SI7021-2.ino.cpp.o"
Compiling libraries...
Compiling library "Wire"
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/libraries/Wire/Wire.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/libraries/Wire/utility/twi.c.o
Compiling library "I2C-Sensor-Lib_iLib"
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/libraries/I2C-Sensor-Lib_iLib/i2c.cpp.o
Compiling core...
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-gcc" -c -g -x assembler-with-cpp -mmcu=atmega328p -DF_CPU=1000000L -DARDUINO=10801 -DARDUINO_AVR_MICRO8 -DARDUINO_ARCH_AVR   "-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Users/viktor/Library/Arduino15/packages/MySensors/hardware/avr/1.0.1/variants/micro" "/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino/wiring_pulse.S" -o "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_pulse.S.o"
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/WInterrupts.c.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/hooks.c.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring.c.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_analog.c.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_digital.c.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_pulse.c.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_shift.c.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/CDC.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial0.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial1.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial2.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial3.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/IPAddress.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/PluggableUSB.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/Print.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/Stream.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/Tone.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/USBCore.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/WMath.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/WString.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/abi.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/main.cpp.o
Using previously compiled file: /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/new.cpp.o
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_pulse.S.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/WInterrupts.c.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/hooks.c.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring.c.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_analog.c.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_digital.c.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_pulse.c.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/wiring_shift.c.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/CDC.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial0.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial1.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial2.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/HardwareSerial3.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/IPAddress.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/PluggableUSB.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/Print.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/Stream.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/Tone.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/USBCore.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/WMath.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/WString.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/abi.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/main.cpp.o"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-ar" rcs  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/new.cpp.o"
Linking everything together...
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-gcc" -w -Os -Wl,--gc-sections -mmcu=atmega328p  -o "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.elf" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/sketch/i2c_SI7021-2.ino.cpp.o" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/libraries/Wire/Wire.cpp.o" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/libraries/Wire/utility/twi.c.o" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/libraries/I2C-Sensor-Lib_iLib/i2c.cpp.o" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/core/core.a" "-L/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688" -lm
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.elf" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.eep"
"/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-objcopy" -O ihex -R .eeprom  "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.elf" "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.hex"
Using library Wire at version 1.0 in folder: /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/Wire 
Using library I2C-Sensor-Lib_iLib at version 0.8.2 in folder: /Users/viktor/Documents/Arduino/libraries/I2C-Sensor-Lib_iLib 
Sketch uses 6406 bytes (20%) of program storage space. Maximum is 30720 bytes.
Global variables use 499 bytes (24%) of dynamic memory, leaving 1549 bytes for local variables. Maximum is 2048 bytes.
/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avrdude -C/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf -v -patmega328p -carduino -P/dev/cu.usbserial-AI050RV3 -b57600 -D -Uflash:w:/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.hex:i 

avrdude: Version 6.3, compiled on Dec 16 2016 at 13:32:25
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf"
         User configuration file is "/Users/viktor/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/cu.usbserial-AI050RV3
         Using Programmer              : arduino
         Overriding Baud Rate          : 57600
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : Arduino
         Description     : Arduino
         Hardware Version: 3
         Firmware Version: 5.0
         Vtarget         : 0.3 V
         Varef           : 0.3 V
         Oscillator      : 28.800 kHz
         SCK period      : 3.3 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: reading input file "/var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.hex"
avrdude: writing flash (6406 bytes):

Writing | ################################################## | 100% 2.45s

avrdude: 6406 bytes of flash written
avrdude: verifying flash memory against /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.hex:
avrdude: load data flash data from input file /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.hex:
avrdude: input file /var/folders/zs/f1p3lxyn54g_bqr6kvdzgps00000gp/T/arduino_build_365688/i2c_SI7021-2.ino.hex contains 6406 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 2.75s

avrdude: verifying ...
avrdude: 6406 bytes of flash verified

avrdude done.  Thank you.

This are my settings in Arduino IDE:

Any idea what I should fix to be able see debug messages in console?

Thank you for help.