diff --git a/defines.h b/defines.h
index 15cff86..4cf1efc 100644
--- a/defines.h
+++ b/defines.h
@@ -159,7 +159,19 @@
   // #ifndef I2C_USE_WIRE
   // #define I2C_USE_WIRE
   // #endif
-
+  #define SDA I2C_SDA
+  #define SCL I2C_SCL
+  #include <api\deprecated-avr-comp\avr\pgmspace.h>
+  extern const uint16_t PROGMEM port_to_mode_PGM[];
+  extern const uint16_t PROGMEM port_to_input_PGM[];
+  extern const uint16_t PROGMEM port_to_output_PGM[];
+  extern const uint8_t PROGMEM digital_pin_to_port_PGM[];
+  // extern const uint8_t PROGMEM digital_pin_to_bit_PGM[];
+  extern const uint8_t PROGMEM digital_pin_to_bit_mask_PGM[];
+  extern const uint8_t PROGMEM digital_pin_to_timer_PGM[];
+  #define portOutputRegister(P) ( (volatile uint8_t *)( pgm_read_word( port_to_output_PGM + (P))) )
+  #define portInputRegister(P) ( (volatile uint8_t *)( pgm_read_word( port_to_input_PGM + (P))) )
+  #define digitalPinToBitMask(P) ( pgm_read_byte( digital_pin_to_bit_mask_PGM + (P) ) )
 /* TODO when ready 
 #elif defined(ARDUINO_ARCH_RP2040)
   #define ARDUINO_TYPE "RP2040"