diff --git a/platformio.ini b/platformio.ini
index 921018c..a2ddfc7 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -35,6 +35,9 @@ lib_deps =
 lib_ignore = 
 extra_scripts = 
 	post:tools/build.py
+build_flags = 
+	${env.build_flags}
+	-D RAM_SIZE=81920
 
 [esp32_defaults]
 platform = espressif32
@@ -45,6 +48,9 @@ lib_ignore =
 extra_scripts = 
 	post:tools/esp32.py
 	post:tools/build.py
+build_flags = 
+	${env.build_flags}
+	-D RAM_SIZE=327680
 
 
 ; Boards
@@ -54,6 +60,14 @@ board = d1_mini
 lib_deps = ${esp8266_defaults.lib_deps}
 lib_ignore = ${esp8266_defaults.lib_ignore}
 extra_scripts = ${esp8266_defaults.extra_scripts}
+build_flags = 
+	${esp8266_defaults.build_flags}
+	-D OT_IN_PIN_DEFAULT=4
+	-D OT_OUT_PIN_DEFAULT=5
+	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D SENSOR_INDOOR_PIN_DEFAULT=14
+	-D LED_STATUS_PIN=13
+	-D LED_OT_RX_PIN=15
 
 [env:d1_mini_lite]
 platform = ${esp8266_defaults.platform}
@@ -61,6 +75,14 @@ board = d1_mini_lite
 lib_deps = ${esp8266_defaults.lib_deps}
 lib_ignore = ${esp8266_defaults.lib_ignore}
 extra_scripts = ${esp8266_defaults.extra_scripts}
+build_flags = 
+	${esp8266_defaults.build_flags}
+	-D OT_IN_PIN_DEFAULT=4
+	-D OT_OUT_PIN_DEFAULT=5
+	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D SENSOR_INDOOR_PIN_DEFAULT=14
+	-D LED_STATUS_PIN=13
+	-D LED_OT_RX_PIN=15
 
 [env:d1_mini_pro]
 platform = ${esp8266_defaults.platform}
@@ -68,6 +90,14 @@ board = d1_mini_pro
 lib_deps = ${esp8266_defaults.lib_deps}
 lib_ignore = ${esp8266_defaults.lib_ignore}
 extra_scripts = ${esp8266_defaults.extra_scripts}
+build_flags = 
+	${esp8266_defaults.build_flags}
+	-D OT_IN_PIN_DEFAULT=4
+	-D OT_OUT_PIN_DEFAULT=5
+	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D SENSOR_INDOOR_PIN_DEFAULT=14
+	-D LED_STATUS_PIN=13
+	-D LED_OT_RX_PIN=15
 
 [env:s2_mini]
 platform = ${esp32_defaults.platform}
@@ -75,6 +105,14 @@ board = lolin_s2_mini
 lib_deps = ${esp32_defaults.lib_deps}
 lib_ignore = ${esp32_defaults.lib_ignore}
 extra_scripts = ${esp32_defaults.extra_scripts}
+build_flags = 
+	${esp32_defaults.build_flags}
+	-D OT_IN_PIN_DEFAULT=33
+	-D OT_OUT_PIN_DEFAULT=35
+	-D SENSOR_OUTDOOR_PIN_DEFAULT=9
+	-D SENSOR_INDOOR_PIN_DEFAULT=7
+	-D LED_STATUS_PIN=11
+	-D LED_OT_RX_PIN=12
 
 [env:s3_mini] 
 platform = ${esp32_defaults.platform}
@@ -82,10 +120,26 @@ board = lolin_s3_mini
 lib_deps = ${esp32_defaults.lib_deps}
 lib_ignore = ${esp32_defaults.lib_ignore}
 extra_scripts = ${esp32_defaults.extra_scripts}
+build_flags = 
+	${esp32_defaults.build_flags}
+	-D OT_IN_PIN_DEFAULT=35
+	-D OT_OUT_PIN_DEFAULT=36
+	-D SENSOR_OUTDOOR_PIN_DEFAULT=13
+	-D SENSOR_INDOOR_PIN_DEFAULT=12
+	-D LED_STATUS_PIN=11
+	-D LED_OT_RX_PIN=10
 
 [env:nodemcu_32s]
 platform = ${esp32_defaults.platform}
 board = nodemcu-32s
 lib_deps = ${esp32_defaults.lib_deps}
 lib_ignore = ${esp32_defaults.lib_ignore}
-extra_scripts = ${esp32_defaults.extra_scripts}
\ No newline at end of file
+extra_scripts = ${esp32_defaults.extra_scripts}
+build_flags = 
+	${esp32_defaults.build_flags}
+	-D OT_IN_PIN_DEFAULT=21
+	-D OT_OUT_PIN_DEFAULT=22
+	-D SENSOR_OUTDOOR_PIN_DEFAULT=12
+	-D SENSOR_INDOOR_PIN_DEFAULT=13
+	-D LED_STATUS_PIN=18
+	-D LED_OT_RX_PIN=19
\ No newline at end of file
diff --git a/src/defines.h b/src/defines.h
index f2c09a6..a2f3ea1 100644
--- a/src/defines.h
+++ b/src/defines.h
@@ -12,32 +12,38 @@
 #define EXT_SENSORS_INTERVAL        5000
 #define EXT_SENSORS_FILTER_K        0.15
 
-#define LED_STATUS_PIN              13
-#define LED_OT_RX_PIN               15
-
 #define CONFIG_URL                  "http://%s/"
 #define SETTINGS_VALID_VALUE        "stvalid" // only 8 chars!
 
-#if defined(ESP8266)
-  #define RAM_SIZE 81920
-  #define OT_IN_PIN_DEFAULT 4
-  #define OT_OUT_PIN_DEFAULT 5
-  #define SENSOR_OUTDOOR_PIN_DEFAULT 12
-  #define SENSOR_INDOOR_PIN_DEFAULT 14
-#elif defined(ESP32)
-  #define RAM_SIZE 327680
-  #define OT_IN_PIN_DEFAULT 17
-  #define OT_OUT_PIN_DEFAULT 21
-  #define SENSOR_OUTDOOR_PIN_DEFAULT 2
-  #define SENSOR_INDOOR_PIN_DEFAULT 4
-#else
+
+
+#ifndef RAM_SIZE
   #define RAM_SIZE 999999
+#endif
+
+#ifndef OT_IN_PIN_DEFAULT
   #define OT_IN_PIN_DEFAULT 0
+#endif
+
+#ifndef OT_OUT_PIN_DEFAULT
   #define OT_OUT_PIN_DEFAULT 0
+#endif
+
+#ifndef SENSOR_OUTDOOR_PIN_DEFAULT
   #define SENSOR_OUTDOOR_PIN_DEFAULT 0
+#endif
+
+#ifndef SENSOR_INDOOR_PIN_DEFAULT
   #define SENSOR_INDOOR_PIN_DEFAULT 0
 #endif
 
+#ifndef LED_STATUS_PIN
+  #define LED_STATUS_PIN 0
+#endif
+
+#ifndef LED_OT_RX_PIN
+  #define LED_OT_RX_PIN 0
+#endif
 
 #ifdef USE_TELNET
   #define INFO_STREAM TelnetStream