diff --git a/IO.h b/IO.h
index a52db83..51c19c3 100644
--- a/IO.h
+++ b/IO.h
@@ -75,6 +75,7 @@ public:
   void      DMR_pin(bool on);
   void      YSF_pin(bool on);
   void      P25_pin(bool on);
+  void      NXDN_pin(bool on);
   void      COS_pin(bool on);
   void      interrupt(void);
 #if defined(DUPLEX)
diff --git a/IOArduino.cpp b/IOArduino.cpp
index cc80f8f..d31a3c1 100644
--- a/IOArduino.cpp
+++ b/IOArduino.cpp
@@ -47,6 +47,7 @@
 #define PIN_DMR_LED    PB13
 #define PIN_YSF_LED    PB1
 #define PIN_P25_LED    PB0
+#define PIN_NXDN_LED   PA8
 #define PIN_PTT_LED    PB14
 #define PIN_COS_LED    PB15
 
@@ -69,6 +70,7 @@
 #define PIN_DMR_LED    PB13
 #define PIN_YSF_LED    PB1
 #define PIN_P25_LED    PB0
+#define PIN_NXDN_LED   PA8
 #define PIN_PTT_LED    PB14
 #define PIN_COS_LED    PB15
 
@@ -93,6 +95,7 @@
 #define PIN_DMR_LED   17
 #define PIN_YSF_LED   18
 #define PIN_P25_LED   19
+#define PIN_NXDN_LED  20
 #define PIN_PTT_LED   14
 #define PIN_COS_LED   15
 
@@ -113,6 +116,7 @@
 #define PIN_DMR_LED   15
 #define PIN_YSF_LED   16
 #define PIN_P25_LED   17
+#define PIN_NXDN_LED  18
 #define PIN_PTT_LED    9
 #define PIN_COS_LED   10
 
@@ -163,6 +167,7 @@ void CIO::Init()
   pinMode(PIN_DMR_LED, OUTPUT);
   pinMode(PIN_YSF_LED, OUTPUT);
   pinMode(PIN_P25_LED, OUTPUT);
+  pinMode(PIN_NXDN_LED, OUTPUT);
   pinMode(PIN_PTT_LED, OUTPUT);
   pinMode(PIN_COS_LED, OUTPUT);
   
@@ -306,6 +311,11 @@ void CIO::P25_pin(bool on)
   digitalWrite(PIN_P25_LED, on ? HIGH : LOW);
 }
 
+void CIO::NXDN_pin(bool on) 
+{
+  digitalWrite(PIN_NXDN_LED, on ? HIGH : LOW);
+}
+
 void CIO::PTT_pin(bool on) 
 {
   digitalWrite(PIN_PTT_LED, on ? HIGH : LOW);
diff --git a/IOSTM.cpp b/IOSTM.cpp
index af0fc74..d2bd437 100644
--- a/IOSTM.cpp
+++ b/IOSTM.cpp
@@ -80,6 +80,9 @@
 #define PIN_P25_LED          GPIO_Pin_12
 #define PORT_P25_LED         GPIOA
 
+#define PIN_NXDN_LED         GPIO_Pin_8
+#define PORT_NXDN_LED        GPIOA
+
 #define PIN_PTT_LED          GPIO_Pin_12
 #define PORT_PTT_LED         GPIOB
 
@@ -140,6 +143,9 @@
 #define PIN_P25_LED          GPIO_Pin_0
 #define PORT_P25_LED         GPIOB
 
+#define PIN_NXDN_LED         GPIO_Pin_8
+#define PORT_NXDN_LED        GPIOA
+
 #define PIN_PTT_LED          GPIO_Pin_14
 #define PORT_PTT_LED         GPIOB
 
@@ -209,6 +215,9 @@
 #define PIN_P25_LED          GPIO_Pin_0
 #define PORT_P25_LED         GPIOB
 
+#define PIN_NXDN_LED         GPIO_Pin_8
+#define PORT_NXDN_LED        GPIOA
+
 #define PIN_PTT_LED          GPIO_Pin_14
 #define PORT_PTT_LED         GPIOB
 
@@ -413,6 +422,12 @@ void CIO::Init()
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_P25_LED, &GPIO_InitStruct);
 
+  // NXDN LED 
+  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_InitStruct.GPIO_Pin   = PIN_NXDN_LED;
+  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
+  GPIO_Init(PORT_NXDN_LED, &GPIO_InitStruct);
+
   // PTT LED
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_PTT_LED;
@@ -627,6 +642,11 @@ void CIO::P25_pin(bool on)
   GPIO_WriteBit(PORT_P25_LED, PIN_P25_LED, on ? Bit_SET : Bit_RESET);
 }
 
+void CIO::NXDN_pin(bool on)
+{
+  GPIO_WriteBit(PORT_NXDN_LED, PIN_NXDN_LED, on ? Bit_SET : Bit_RESET);
+}
+
 void CIO::PTT_pin(bool on)
 {
   GPIO_WriteBit(PORT_PTT_LED, PIN_PTT_LED, on ? Bit_SET : Bit_RESET);