diff --git a/device_address.c b/device_address.c
new file mode 100644
index 0000000..65e1e84
--- /dev/null
+++ b/device_address.c
@@ -0,0 +1,41 @@
+#include "device_address.h"
+
+#define DEFAULT_MODBUS_ADDRESS (32)
+
+uint8_t EEPROM_ReadByte(uint8_t __eeprom*adr)
+{
+    while (EECR & (1<<EEWE));
+    EEAR = (uint16_t)adr;
+    EECR |= (1<<EERE);
+    return EEDR;
+}
+
+void EEPROM_WriteByte(uint8_t __eeprom*adr, uint8_t value)
+{
+    while (EECR & (1<<EEWE));
+    EEAR = (uint16_t)adr;
+    EEDR = value;
+    EECR |= (1<<EEMWE);
+    EECR |= (1<<EEWE);
+}
+
+uint8_t get_device_address(void)
+{
+    return EEPROM_ReadByte(0);
+}
+
+void write_device_address(uint8_t address)
+{
+    EEPROM_WriteByte(0, address);
+    EEPROM_WriteByte(1, ~address);
+}
+
+uint8_t get_default_address(void)
+{
+    return DEFAULT_MODBUS_ADDRESS;
+}
+
+int is_valid_device_address(void)
+{
+    return (EEPROM_ReadByte(0) ^ EEPROM_ReadByte(1) == 0xFF);
+}
\ No newline at end of file
diff --git a/device_address.h b/device_address.h
new file mode 100644
index 0000000..3e1e5c6
--- /dev/null
+++ b/device_address.h
@@ -0,0 +1,9 @@
+#ifndef DEVICE_ADDRESS_H
+#define DEVICE_ADDRESS_H
+
+uint8_t get_device_address(void);
+void write_device_address(uint8_t address);
+uint8_t get_default_address(void);
+int is_valid_device_address(void);
+
+#endif /*DEVICE_ADDRESS_H*/
\ No newline at end of file