diff --git a/firmware/v01/Makefile b/firmware/v01/Makefile
new file mode 100644
index 0000000..19134a9
--- /dev/null
+++ b/firmware/v01/Makefile
@@ -0,0 +1,129 @@
+# Arduino Make file. Refer to https://github.com/sudar/Arduino-Makefile
+
+BOARD_TAG    = uno
+USER_LIB_PATH += /home/ricardo/Arduino/libraries
+ARDUINO_LIBS += Adafruit_GFX_Library \
+				SoftwareSerial \
+				Adafruit_SSD1306 \
+				SPI \
+				Wire
+ARDUINO_DIR  = /home/ricardo/Arduino_IDE
+MONITOR_PORT = /dev/ttyACM0
+include /usr/share/arduino-mk/Arduino.mk
+
+
+
+# --- leonardo (or pro micro w/leo bootloader)
+#BOARD_TAG    = leonardo
+#MONITOR_PORT = /dev/ttyACM0
+#include /usr/share/arduino/Arduino.mk
+
+# --- mega2560 ide 1.0
+#BOARD_TAG    = mega2560
+#ARDUINO_PORT = /dev/ttyACM0
+#include /usr/share/arduino/Arduino.mk
+
+# --- mega2560 ide 1.6
+#BOARD_TAG    = mega
+#BOARD_SUB    = atmega2560
+#MONITOR_PORT = /dev/ttyACM0
+#ARDUINO_DIR  = /where/you/installed/arduino-1.6.5
+#include /usr/share/arduino/Arduino.mk
+
+# --- nano ide 1.0
+#BOARD_TAG    = nano328
+#MONITOR_PORT = /dev/ttyUSB0
+#include /usr/share/arduino/Arduino.mk
+
+# --- nano ide 1.6
+#BOARD_TAG   = nano
+#BOARD_SUB   = atmega328
+#ARDUINO_DIR = /where/you/installed/arduino-1.6.5
+#include /usr/share/arduino/Arduino.mk
+
+# --- pro mini
+#BOARD_TAG    = pro5v328
+#MONITOR_PORT = /dev/ttyUSB0
+#include /usr/share/arduino/Arduino.mk
+
+# --- sparkfun pro micro
+#BOARD_TAG         = promicro16
+#ALTERNATE_CORE    = promicro
+#BOARDS_TXT        = $(HOME)/arduino/hardware/promicro/boards.txt
+#BOOTLOADER_PARENT = $(HOME)/arduino/hardware/promicro/bootloaders
+#BOOTLOADER_PATH   = caterina
+#BOOTLOADER_FILE   = Caterina-promicro16.hex
+#ISP_PROG          = usbasp
+#AVRDUDE_OPTS      = -v
+#include /usr/share/arduino/Arduino.mk
+
+# --- chipkit
+#BOARD_TAG = mega_pic32
+#MPIDE_DIR = /where/you/installed/mpide-0023-linux64-20130817-test
+#include /usr/share/arduino/chipKIT.mk
+
+# --- pinoccio
+#BOARD_TAG         = pinoccio256
+#ALTERNATE_CORE    = pinoccio
+#BOOTLOADER_PARENT = $(HOME)/arduino/hardware/pinoccio/bootloaders
+#BOOTLOADER_PATH   = STK500RFR2/release_0.51
+#BOOTLOADER_FILE   = boot_pinoccio.hex
+#CFLAGS_STD        = -std=gnu99
+#CXXFLAGS_STD      = -std=gnu++11
+#include /usr/share/arduino/Arduino.mk
+
+# --- fio
+#BOARD_TAG = fio
+#include /usr/share/arduino/Arduino.mk
+
+# --- atmega-ng ide 1.6
+#BOARD_TAG    = atmegang
+#BOARD_SUB    = atmega168
+#MONITOR_PORT = /dev/ttyACM0
+#ARDUINO_DIR  = /where/you/installed/arduino-1.6.5
+#include /usr/share/arduino/Arduino.mk
+
+# --- teensy3
+#BOARD_TAG   = teensy31
+#ARDUINO_DIR = /where/you/installed/the/patched/teensy/arduino-1.0.6
+#include /usr/share/arduino/Teensy.mk
+
+# --- mighty 1284p
+#BOARD_TAG         = mighty_opt
+#BOARDS_TXT        = $(HOME)/arduino/hardware/mighty-1284p/boards.txt
+#BOOTLOADER_PARENT = $(HOME)/arduino/hardware/mighty-1284p/bootloaders
+#BOOTLOADER_PATH   = optiboot
+#BOOTLOADER_FILE   = optiboot_atmega1284p.hex
+#ISP_PROG          = usbasp
+#AVRDUDE_OPTS      = -v
+#include /usr/share/arduino/Arduino.mk
+
+# --- mightycore
+#ALTERNATE_CORE = MightyCore
+#BOARD_TAG = 1284
+#MCU = atmega1284p
+#BOARD_TAG = 644
+#MCU = atmega644p
+#VARIANT = standard
+#F_CPU = 16000000L
+#include /usr/share/arduino/Arduino.mk
+
+# ---  megacore
+#BOARD_TAG      = 128
+#ALTERNATE_CORE = megacore
+#F_CPU          = 16000000L
+#include /usr/share/arduino/Arduino.mk
+
+# --- sanguino 644p
+#BOARD_TAG      = atmega644p
+#ALTERNATE_CORE = sanguino
+#ISP_PROG       = usbasp
+#AVRDUDE_OPTS   = -v
+#include /usr/share/arduino/Arduino.mk
+
+# --- atmega328p on breadboard
+#BOARD_TAG    = atmega328bb
+#ISP_PROG     = usbasp
+#AVRDUDE_OPTS = -v
+#BOARDS_TXT   = $(HOME)/arduino/hardware/breadboard/boards.txt
+#include /usr/share/arduino/Arduino.mk
diff --git a/firmware/v01/v01.ino b/firmware/v01/v01.ino
index c117617..e4af746 100644
--- a/firmware/v01/v01.ino
+++ b/firmware/v01/v01.ino
@@ -34,6 +34,17 @@ Adafruit_SSD1306 display(OLED_RESET);
 #define rDOWN digitalRead(DOWN)     // Read button DOWN state
 #define rCANCEL digitalRead(CANCEL) // Read button CANCEL state
 
+
+
+void zero();
+void one();
+void two();
+void three();
+void four();
+void read_serial();
+void write_serial();
+
+
 //volatile byte state = LOW;
 
 // Variables creation