diff --git a/configs/MMDVM_HS_Dual_Hat-12mhz.h b/configs/MMDVM_HS_Dual_Hat-12mhz.h
index 2a8def7..0da2989 100644
--- a/configs/MMDVM_HS_Dual_Hat-12mhz.h
+++ b/configs/MMDVM_HS_Dual_Hat-12mhz.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/MMDVM_HS_Dual_Hat.h b/configs/MMDVM_HS_Dual_Hat.h
index 5cf37ed..c968edd 100644
--- a/configs/MMDVM_HS_Dual_Hat.h
+++ b/configs/MMDVM_HS_Dual_Hat.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/MMDVM_HS_Hat-12mhz.h b/configs/MMDVM_HS_Hat-12mhz.h
index f102194..45433fd 100644
--- a/configs/MMDVM_HS_Hat-12mhz.h
+++ b/configs/MMDVM_HS_Hat-12mhz.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/MMDVM_HS_Hat.h b/configs/MMDVM_HS_Hat.h
index 02105a4..c9f1a9d 100644
--- a/configs/MMDVM_HS_Hat.h
+++ b/configs/MMDVM_HS_Hat.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/NanoDV_NPI.h b/configs/NanoDV_NPI.h
index 96bf446..9bd4b64 100644
--- a/configs/NanoDV_NPI.h
+++ b/configs/NanoDV_NPI.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/NanoDV_USB.h b/configs/NanoDV_USB.h
index 819f8e0..18272ad 100644
--- a/configs/NanoDV_USB.h
+++ b/configs/NanoDV_USB.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 // #define STM32_USART1_HOST
 #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/Nano_hotSPOT.h b/configs/Nano_hotSPOT.h
index 012eb32..cbe6d3d 100644
--- a/configs/Nano_hotSPOT.h
+++ b/configs/Nano_hotSPOT.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/ZUMspot_Libre.h b/configs/ZUMspot_Libre.h
index b7d146f..b2d0678 100644
--- a/configs/ZUMspot_Libre.h
+++ b/configs/ZUMspot_Libre.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 // #define STM32_USART1_HOST
 #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/ZUMspot_RPi.h b/configs/ZUMspot_RPi.h
index 95be8d7..4f5a0f6 100644
--- a/configs/ZUMspot_RPi.h
+++ b/configs/ZUMspot_RPi.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/ZUMspot_USB.h b/configs/ZUMspot_USB.h
index c5502b4..c65cff0 100644
--- a/configs/ZUMspot_USB.h
+++ b/configs/ZUMspot_USB.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 // #define STM32_USART1_HOST
 #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/ZUMspot_duplex.h b/configs/ZUMspot_duplex.h
index f131e9a..4f5f9f6 100644
--- a/configs/ZUMspot_duplex.h
+++ b/configs/ZUMspot_duplex.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 // #define STM32_USART1_HOST
 #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/generic_duplex_gpio.h b/configs/generic_duplex_gpio.h
index 4bbad13..cea9e4c 100644
--- a/configs/generic_duplex_gpio.h
+++ b/configs/generic_duplex_gpio.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE
diff --git a/configs/generic_gpio.h b/configs/generic_gpio.h
index b6d7519..6173f82 100644
--- a/configs/generic_gpio.h
+++ b/configs/generic_gpio.h
@@ -58,6 +58,10 @@
 // Host communication selection:
 #define STM32_USART1_HOST
 // #define STM32_USB_HOST
+// #define STM32_I2C_HOST
+
+// I2C host address:
+#define I2C_ADDR 0x22
 
 // Enable mode detection:
 #define ENABLE_SCAN_MODE