diff --git a/avr_usart.h b/avr_usart.h
index 84ae8db..f3cb982 100644
--- a/avr_usart.h
+++ b/avr_usart.h
@@ -21,11 +21,11 @@
 #define BLE_BAUD    9600 
 #define BT_UBRR     FOSC/16/BLE_BAUD - 1
 
-#define TX_PIN      PIND0
-#define TX_DDR      DDD0
+#define TX_PIN      PIND1
+#define TX_DDR      DDD1
 
-#define RX_PIN      PIND1
-#define RX_DDR      DDD1
+#define RX_PIN      PIND0
+#define RX_DDR      DDD0
 
 #define AT_PORT     PORTD