diff --git a/extra_scripts.py b/extra_scripts.py
new file mode 100644
index 0000000..c981db8
--- /dev/null
+++ b/extra_scripts.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+import time
+Import("env")
+
+# ------------------------------------------------------------------------------
+# Utils
+# ------------------------------------------------------------------------------
+
+class Color:
+    BLACK = '\x1b[1;30m'
+    RED = '\x1b[1;31m'
+    GREEN = '\x1b[1;32m'
+    YELLOW = '\x1b[1;33m'
+    BLUE = '\x1b[1;34m'
+    MAGENTA = '\x1b[1;35m'
+    CYAN = '\x1b[1;36m'
+    WHITE = '\x1b[1;37m'
+    LIGHT_GREY = '\x1b[0;30m'
+    LIGHT_RED = '\x1b[0;31m'
+    LIGHT_GREEN = '\x1b[0;32m'
+    LIGHT_YELLOW = '\x1b[0;33m'
+    LIGHT_BLUE = '\x1b[0;34m'
+    LIGHT_MAGENTA = '\x1b[0;35m'
+    LIGHT_CYAN = '\x1b[0;36m'
+    LIGHT_WHITE = '\x1b[0;37m'
+
+def clr(color, text):
+    return color + str(text) + '\x1b[0m'
+
+# ------------------------------------------------------------------------------
+# Callbacks
+# ------------------------------------------------------------------------------
+
+def check_size(source, target, env):
+    time.sleep(1)
+    size = target[0].get_size()
+    print clr(Color.LIGHT_BLUE, "Binary size: %s bytes" % size)
+    #if size > 512000:
+    #    print clr(Color.LIGHT_RED, "File too large for OTA!")
+    #    Exit(1)
+
+# ------------------------------------------------------------------------------
+# Hooks
+# ------------------------------------------------------------------------------
+
+env.AddPostAction("$BUILD_DIR/${PROGNAME}.bin", check_size)
diff --git a/platformio.ini b/platformio.ini
index b9c5c9a..4a61d44 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -8,27 +8,36 @@
 ; http://docs.platformio.org/en/stable/projectconf.html
 
 [platformio]
-env_default = sonoffsc
+env_default = sonoff-sc
 src_dir = sonoffsc
 
-[env:sonoff-sc]
+[common]
 platform = atmelavr
 board = uno
 framework = arduino
-build_flags = -DDHT_TYPE=DHT11
+build_flags = -Llibs -DDEBUG -Wl,-u,vfprintf -lprintf_flt
 lib_deps =
     Adafruit Unified Sensor
     DHT sensor library
     MsTimer2
     TimerOne
+lib_ignore =
+extra_scripts = extra_scripts.py
+
+[env:sonoff-sc]
+platform = ${common.platform}
+board = ${common.board}
+framework = ${common.framework}
+lib_deps = ${common.lib_deps}
+lib_ignore = ${common.lib_ignore}
+build_flags = ${common.build_flags} -DDHT_TYPE=DHT11
+extra_scripts = ${common.extra_scripts}
 
 [env:sonoff-sc-pro]
-platform = atmelavr
-board = uno
-framework = arduino
-build_flags = -DDHT_TYPE=DHT22
-lib_deps =
-    Adafruit Unified Sensor
-    DHT sensor library
-    MsTimer2
-    TimerOne
+platform = ${common.platform}
+board = ${common.board}
+framework = ${common.framework}
+lib_deps = ${common.lib_deps}
+lib_ignore = ${common.lib_ignore}
+build_flags = ${common.build_flags} -DDHT_TYPE=DHT22
+extra_scripts = ${common.extra_scripts}