diff --git a/src/hal/lopy.h b/src/hal/lopy.h
index d9d4068d..11b3cff2 100644
--- a/src/hal/lopy.h
+++ b/src/hal/lopy.h
@@ -4,15 +4,6 @@
 #define HAS_LED NOT_A_PIN // LoPy4 has no on board LED, so we use RGB LED on LoPy4
 #define HAS_RGB_LED GPIO_NUM_0  // WS2812B RGB LED on GPIO0
 
-// !!EXPERIMENTAL - not tested yet!!
-// uncomment this only if your LoPy runs on a Pytrack expansion board with GPS
-// see http://www.quectel.com/UploadImage/Downlad/Quectel_L76-L_I2C_Application_Note_V1.0.pdf
-//#define HAS_GPS 1
-//#define GPS_QUECTEL_L76 GPIO_NUM_25, GPIO_NUM_26 // SDA (P22), SCL (P21)
-//#define GPS_ADDR 0x10
-//#define HAS_BUTTON GPIO_NUM_37 // (P14)
-//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
-
 // Hardware pin definitions for Pycom LoPy board
 #define PIN_SPI_SS    GPIO_NUM_17
 #define PIN_SPI_MOSI  GPIO_NUM_27
@@ -26,3 +17,24 @@
 // select WIFI antenna (internal = onboard / external = u.fl socket)
 #define HAS_ANTENNA_SWITCH  16      // pin for switching wifi antenna
 #define WIFI_ANTENNA 0              // 0 = internal, 1 = external
+
+// !!EXPERIMENTAL - not tested yet!!
+// uncomment this only if your LoPy runs on a Pytrack expansion board with GPS
+// see http://www.quectel.com/UploadImage/Downlad/Quectel_L76-L_I2C_Application_Note_V1.0.pdf
+//#define HAS_GPS 1
+//#define GPS_QUECTEL_L76 GPIO_NUM_25, GPIO_NUM_26 // SDA (P22), SCL (P21)
+//#define GPS_ADDR 0x10
+//#define HAS_BUTTON GPIO_NUM_37 // (P14)
+//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
+
+// uncomment this only if your LoPy runs on a expansion board 3.0
+//#define HAS_BATTERY_PROBE ADC1_GPIO39_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
+//#define BATT_FACTOR 2 // voltage divider 1MOhm/1MOhm on board
+//#define HAS_BUTTON GPIO_NUM_37 // (P14)
+//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
+
+// uncomment this only if your LoPy runs on a expansion board 2.0
+//#define HAS_BATTERY_PROBE ADC1_GPIO39_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
+//#define BATT_FACTOR 4 // voltage divider 115kOhm/56kOhm on board
+//#define HAS_BUTTON GPIO_NUM_13 // (P10)
+//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
diff --git a/src/hal/lopy4.h b/src/hal/lopy4.h
index e5481f12..ef6a4d77 100644
--- a/src/hal/lopy4.h
+++ b/src/hal/lopy4.h
@@ -4,15 +4,6 @@
 #define HAS_LED NOT_A_PIN // LoPy4 has no on board LED, so we use RGB LED on LoPy4
 #define HAS_RGB_LED   GPIO_NUM_0  // WS2812B RGB LED on GPIO0
 
-// !!EXPERIMENTAL - not tested yet!!
-// uncomment this only if your LoPy runs on a Pytrack expansion board with GPS
-// see http://www.quectel.com/UploadImage/Downlad/Quectel_L76-L_I2C_Application_Note_V1.0.pdf
-//#define HAS_GPS 1
-//#define GPS_QUECTEL_L76 GPIO_NUM_25, GPIO_NUM_26 // SDA (P22), SCL (P21)
-//#define GPS_ADDR 0x10
-//#define HAS_BUTTON GPIO_NUM_37 // (P14)
-//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
-
 // Hardware pin definitions for Pycom LoPy4 board
 #define PIN_SPI_SS    GPIO_NUM_18
 #define PIN_SPI_MOSI  GPIO_NUM_27
@@ -25,4 +16,25 @@
 
 // select WIFI antenna (internal = onboard / external = u.fl socket)
 #define HAS_ANTENNA_SWITCH  21      // pin for switching wifi antenna
-#define WIFI_ANTENNA 0              // 0 = internal, 1 = external
\ No newline at end of file
+#define WIFI_ANTENNA 0              // 0 = internal, 1 = external
+
+// !!EXPERIMENTAL - not tested yet!!
+// uncomment this only if your LoPy runs on a Pytrack expansion board with GPS
+// see http://www.quectel.com/UploadImage/Downlad/Quectel_L76-L_I2C_Application_Note_V1.0.pdf
+//#define HAS_GPS 1
+//#define GPS_QUECTEL_L76 GPIO_NUM_25, GPIO_NUM_26 // SDA (P22), SCL (P21)
+//#define GPS_ADDR 0x10
+//#define HAS_BUTTON GPIO_NUM_37 // (P14)
+//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
+
+// uncomment this only if your LoPy runs on a expansion board 3.0
+//#define HAS_BATTERY_PROBE ADC1_GPIO39_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
+//#define BATT_FACTOR 2 // voltage divider 1MOhm/1MOhm on board
+//#define HAS_BUTTON GPIO_NUM_37 // (P14)
+//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
+
+// uncomment this only if your LoPy runs on a expansion board 2.0
+//#define HAS_BATTERY_PROBE ADC1_GPIO39_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
+//#define BATT_FACTOR 4 // voltage divider 115kOhm/56kOhm on board
+//#define HAS_BUTTON GPIO_NUM_13 // (P10)
+//#define BUTTON_PULLUP 1  // Button need pullup instead of default pulldown
\ No newline at end of file