diff --git a/cmake/Platform/Arduino.cmake b/cmake/Platform/Arduino.cmake
index 46800c2..4cefc75 100644
--- a/cmake/Platform/Arduino.cmake
+++ b/cmake/Platform/Arduino.cmake
@@ -482,25 +482,35 @@ endfunction()
 function(get_arduino_flags COMPILE_FLAGS_VAR LINK_FLAGS_VAR BOARD_ID)
     set(BOARD_CORE ${${BOARD_ID}.build.core})
     if(BOARD_CORE)
-        if(ARDUINO_SDK_VERSION MATCHES "([0-9]+)[.]([0-9]+)")
+        if(ARDUINO_SDK_VERSION MATCHES "([0-9]+)[.]([0-9]+)[.]([0-9]+)")
             string(REPLACE "." "" ARDUINO_VERSION_DEFINE "${ARDUINO_SDK_VERSION}") # Normalize version (remove all periods)
-            set(ARDUINO_VERSION_DEFINE "")
-            if(CMAKE_MATCH_1 GREATER 0)
-                set(ARDUINO_VERSION_DEFINE "${CMAKE_MATCH_1}")
-            endif()
-            if(CMAKE_MATCH_2 GREATER 10)
-                set(ARDUINO_VERSION_DEFINE "${ARDUINO_VERSION_DEFINE}${CMAKE_MATCH_2}")
-            else()
-                set(ARDUINO_VERSION_DEFINE "${ARDUINO_VERSION_DEFINE}0${CMAKE_MATCH_2}")
-            endif()
+#             message("1 ARDUINO_VERSION_DEFINE = ${ARDUINO_VERSION_DEFINE}")
+#             set(ARDUINO_VERSION_DEFINE "")
+#             if(CMAKE_MATCH_1 GREATER 0)
+#                 set(ARDUINO_VERSION_DEFINE "${CMAKE_MATCH_1}")
+#                 message("foo = ${ARDUINO_VERSION_DEFINE}")
+#             endif()
+#             if(CMAKE_MATCH_2 GREATER 10)
+#                 set(ARDUINO_VERSION_DEFINE "${ARDUINO_VERSION_DEFINE}${CMAKE_MATCH_2}")
+#                 message("bar = ${ARDUINO_VERSION_DEFINE}")
+#             else()
+#                 set(ARDUINO_VERSION_DEFINE "${ARDUINO_VERSION_DEFINE}0${CMAKE_MATCH_2}")
+#                 message("baz = ${ARDUINO_VERSION_DEFINE}")
+#             endif()
         else()
             message("Invalid Arduino SDK Version (${ARDUINO_SDK_VERSION})")
         endif()
 
+
+#         message("CMAKE_MATCH_1 = ${CMAKE_MATCH_1}")
+#         message("CMAKE_MATCH_2 = ${CMAKE_MATCH_2}")
+#         message("CMAKE_MATCH_3 = ${CMAKE_MATCH_3}")
+        message("2 ARDUINO_VERSION_DEFINE = ${ARDUINO_VERSION_DEFINE}")
+
         # output
         set(COMPILE_FLAGS "-DF_CPU=${${BOARD_ID}.build.f_cpu} -DARDUINO=${ARDUINO_VERSION_DEFINE} -mmcu=${${BOARD_ID}.build.mcu} -I${ARDUINO_CORES_PATH}/${BOARD_CORE} -I${ARDUINO_LIBRARIES_PATH}")
         set(LINK_FLAGS "-mmcu=${${BOARD_ID}.build.mcu}")
-        if(ARDUINO_SDK_VERSION VERSION_GREATER 1.0 OR ARDUINO_SDK_VERSION VERSION_EQUAL 1.0)
+        if(ARDUINO_SDK_VERSION VERSION_GREATER 1.0.0 OR ARDUINO_SDK_VERSION VERSION_EQUAL 1.0.0)
             set(PIN_HEADER ${${BOARD_ID}.build.variant})
             set(COMPILE_FLAGS "${COMPILE_FLAGS} -I${ARDUINO_VARIANTS_PATH}/${PIN_HEADER}")
         endif()
@@ -809,6 +819,8 @@ function(setup_arduino_bootloader_upload TARGET_NAME BOARD_ID PORT AVRDUDE_FLAGS
 
     list(APPEND AVRDUDE_ARGS "-Uflash:w:${TARGET_NAME}.hex")
 
+    message("${AVRDUDE_ARGS}")
+
     add_custom_target(${UPLOAD_TARGET}
                      ${ARDUINO_AVRDUDE_PROGRAM}
                      ${AVRDUDE_ARGS}
@@ -1079,9 +1091,10 @@ endfunction()
 function(detect_arduino_version VAR_NAME)
     if(ARDUINO_VERSION_PATH)
         file(READ ${ARDUINO_VERSION_PATH} ARD_VERSION)
+        message(${ARD_VERSION})
         if("${ARD_VERSION}" MATCHES " *[0]+([0-9]+)")
             set(${VAR_NAME} 0.${CMAKE_MATCH_1} PARENT_SCOPE)
-        elseif("${ARD_VERSION}" MATCHES "[ ]*([0-9]+[.][0-9]+)")
+        elseif("${ARD_VERSION}" MATCHES "[ ]*([0-9]+[.][0-9]+[.][0-9]+)")
             set(${VAR_NAME} ${CMAKE_MATCH_1} PARENT_SCOPE)
         endif()
     endif()
@@ -1589,9 +1602,9 @@ endfunction()
 #=============================================================================#
 #                              C Flags
 #=============================================================================#
-set(ARDUINO_C_FLAGS "-Wall -Wunused -ffunction-sections -fdata-sections")
+set(ARDUINO_C_FLAGS "-g -Wall -ffunction-sections -fdata-sections")
 set(CMAKE_C_FLAGS                "-Os ${ARDUINO_C_FLAGS}" CACHE STRING "")
-set(CMAKE_C_FLAGS_DEBUG          "${ARDUINO_C_FLAGS}" CACHE STRING "")
+set(CMAKE_C_FLAGS_DEBUG          "-Os ${ARDUINO_C_FLAGS}" CACHE STRING "")
 set(CMAKE_C_FLAGS_MINSIZEREL     "-Os -DNDEBUG ${ARDUINO_C_FLAGS}" CACHE STRING "")
 set(CMAKE_C_FLAGS_RELEASE        "-Os -DNDEBUG -w ${ARDUINO_C_FLAGS}" CACHE STRING "")
 set(CMAKE_C_FLAGS_RELWITHDEBINFO "-Os -w ${ARDUINO_C_FLAGS}" CACHE STRING "")
@@ -1601,7 +1614,7 @@ set(CMAKE_C_FLAGS_RELWITHDEBINFO "-Os -w ${ARDUINO_C_FLAGS}" CACHE STRING "")
 #=============================================================================#
 set(ARDUINO_CXX_FLAGS "${ARDUINO_C_FLAGS} -fno-exceptions")
 set(CMAKE_CXX_FLAGS                "-Os ${ARDUINO_CXX_FLAGS}" CACHE STRING "")
-set(CMAKE_CXX_FLAGS_DEBUG          "${ARDUINO_CXX_FLAGS}" CACHE STRING "")
+set(CMAKE_CXX_FLAGS_DEBUG          "-Os ${ARDUINO_CXX_FLAGS}" CACHE STRING "")
 set(CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG ${ARDUINO_CXX_FLAGS}" CACHE STRING "")
 set(CMAKE_CXX_FLAGS_RELEASE        "-Os -DNDEBUG ${ARDUINO_CXX_FLAGS}" CACHE STRING "")
 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-Os ${ARDUINO_CXX_FLAGS}" CACHE STRING "")
@@ -1609,7 +1622,7 @@ set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-Os ${ARDUINO_CXX_FLAGS}" CACHE STRING "")
 #=============================================================================#
 #                       Executable Linker Flags                               #
 #=============================================================================#
-set(ARDUINO_LINKER_FLAGS "-Wl,--gc-sections -lm -dead_strip")
+set(ARDUINO_LINKER_FLAGS "-Wl,--gc-sections -lm")
 set(CMAKE_EXE_LINKER_FLAGS                "${ARDUINO_LINKER_FLAGS}" CACHE STRING "")
 set(CMAKE_EXE_LINKER_FLAGS_DEBUG          "${ARDUINO_LINKER_FLAGS}" CACHE STRING "")
 set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL     "${ARDUINO_LINKER_FLAGS}" CACHE STRING "")
@@ -1724,8 +1737,11 @@ if(NOT ARDUINO_FOUND AND ARDUINO_SDK_PATH)
         AVRSIZE_PROGRAM
         MSG "Invalid Arduino SDK path (${ARDUINO_SDK_PATH}).\n")
 
+    message(${ARDUINO_VERSION_PATH})
     detect_arduino_version(ARDUINO_SDK_VERSION)
+    message(${ARDUINO_SDK_VERSION})
     set(ARDUINO_SDK_VERSION ${ARDUINO_SDK_VERSION} CACHE STRING "Arduino SDK Version")
+    message(${ARDUINO_SDK_VERSION})
 
     if(ARDUINO_SDK_VERSION VERSION_LESS 0.19)
          message(FATAL_ERROR "Unsupported Arduino SDK (require verion 0.19 or higher)")
diff --git a/reflowctl/reflowctl.ino b/reflowctl/reflowctl.ino
index 7f80221..30ce1ef 100644
--- a/reflowctl/reflowctl.ino
+++ b/reflowctl/reflowctl.ino
@@ -1,4 +1,5 @@
 
+// states
 #define START_STATE 0
 #define PREHEAT_STATE 1
 #define RAMP_UP_STATE 2
@@ -13,75 +14,82 @@
 #define E_DT_MIN 1 // temperature dt too small
 #define E_DT_MAX 2 // temperature dt too big
 #define E_TIME_MAX 4 // reflow process does take too long
-#define E_TL_TOO_LONG 8 // package was roasted
-#define E_TP_TOO_LONG 16 // package was roasted
+#define E_TS_TOO_SHORT 8 // Ts duration too short
+#define E_TS_TOO_LONG 16 // Ts duration too long
+#define E_TL_TOO_SHORT 32 // Tl duration too short
+#define E_TL_TOO_LONG 64 // Tl duration too long
+#define E_TP_TOO_SHORT 128 // Tp duration too short
+#define E_TP_TOO_LONG 256 // Tp duration too long
 
 // system time, timestamps and temperatures from sensors
-__attribute__((__unused__)) static unsigned int time = 0; // profile seconds
-__attribute__((__unused__)) static unsigned int temperature = 25; // actual oven temp
-__attribute__((__unused__)) static unsigned int last_temperature = 25; // last oven temp
-__attribute__((__unused__)) static int actual_dt = 0; // actual difference from last to actual temperatur
+static unsigned int time = 0; // profile seconds
+static unsigned int temperature = 25; // actual oven temp
+static unsigned int last_temperature = 25; // last oven temp
+static int actual_dt = 0; // actual difference from last to actual temperatur
 
 
 // profile temperatures
-__attribute__((__unused__)) static unsigned int Ts_min = 150; // °C
-__attribute__((__unused__)) static unsigned int Ts_max = 200; // °C
-__attribute__((__unused__)) static unsigned int Tl = 217; // 217°C
-__attribute__((__unused__)) static unsigned int Tp = 260; // 245-260°C
-__attribute__((__unused__)) static unsigned int time_max = 480; // 8*60s max
+unsigned int Ts_min = 150; // °C
+unsigned int Ts_max = 200; // °C
+unsigned int Tl = 217; // 217°C
+unsigned int Tp = 260; // 245-260°C
+unsigned int time_max = 480; // 8*60s max
 
 
 // profile temp per second rates
-__attribute__((__unused__)) static unsigned int ramp_up_rate_min = 0; // not used yet
-__attribute__((__unused__)) static unsigned int ramp_up_rate_max = 50; // 3°C/s
-__attribute__((__unused__)) static unsigned int ramp_down_max = 6; // 6°C/s max
-__attribute__((__unused__)) static unsigned int ramp_down_min = 2; // 2°C/s max
+unsigned int ramp_up_rate_min = 0; // not used yet
+unsigned int ramp_up_rate_max = 50; // 3°C/s
+unsigned int ramp_down_max = 6; // 6°C/s max
+unsigned int ramp_down_min = 2; // 2°C/s max
 
 
 // profile temp durations
-__attribute__((__unused__)) static unsigned int Ts_duration = 100; // 60-180s
-__attribute__((__unused__)) static unsigned int Tl_duration = 100; // 60-150s
-__attribute__((__unused__)) static unsigned int Tp_duration = 30; // 20-40s
+unsigned int Ts_duration_min = 60; // s
+unsigned int Ts_duration_max = 180; // s
+unsigned int Tl_duration_min = 60; // 60-150s
+unsigned int Tl_duration_max = 150; // 60-150s
+unsigned int Tp_duration_min = 20; // 20-40s
+unsigned int Tp_duration_max = 40; // 20-40s
 
 
 // timestamps of event beginnings/ends
-__attribute__((__unused__)) static unsigned int Ts_min_time = 0;
-__attribute__((__unused__)) static unsigned int Ts_max_time = 0;
-__attribute__((__unused__)) static unsigned int Tl_time_start = 0;
-__attribute__((__unused__)) static unsigned int Tl_time_end = 0;
-__attribute__((__unused__)) static unsigned int Tp_time_start = 0;
-__attribute__((__unused__)) static unsigned int Tp_time_end = 0;
+unsigned int Ts_time_start = 0;
+unsigned int Ts_time_end = 0;
+unsigned int Tl_time_start = 0;
+unsigned int Tl_time_end = 0;
+unsigned int Tp_time_start = 0;
+unsigned int Tp_time_end = 0;
 
 
 // thermostat
-__attribute__((__unused__)) static unsigned int set_min = 0;
-__attribute__((__unused__)) static unsigned int set_max = 0;
-__attribute__((__unused__)) static int set_dt_min = 0;
-__attribute__((__unused__)) static int set_dt_max = 0;
+unsigned int set_min = 0;
+unsigned int set_max = 0;
+int set_dt_min = 0;
+int set_dt_max = 0;
 
 
 // state machine
-__attribute__((__unused__)) static byte state;
-__attribute__((__unused__)) static boolean is_oven_heating = false;
-__attribute__((__unused__)) static byte error_condition = 0;
+unsigned int error_condition = 0;
+byte state = 0;
+boolean is_oven_heating = false;
 
 // ui stuff
-__attribute__((__unused__)) static boolean led_on = false;
+boolean led_on = false;
+boolean disable_checks = true;
 
 void setup() {
   Serial.begin(9600);
-  delay(2000);
+  pinMode(13, OUTPUT);
   set_start_state();
-
 }
 
 
 static void control_oven() {
-  if (temperature < set_min && (!is_oven_heating)) {
+  if (temperature < set_min && !is_oven_heating) {
     is_oven_heating = true;
     Serial.println("Oven turned on");
   }
-  else if (temperature > set_max && is_oven_heating) {
+  else if (temperature > set_min && is_oven_heating) {
     is_oven_heating = false;
     Serial.println("Oven turned off");
   }
@@ -104,6 +112,8 @@ static void get_temp() {
 
 
 static void check_dt() {
+  if (disable_checks)
+    return;
   if (actual_dt > set_dt_max) {
     error_condition |= E_DT_MAX;
   }
@@ -126,19 +136,61 @@ static void print_debug() {
 }
 
 static void check_max_duration() {
+  if (disable_checks)
+    return;
+  Serial.println(time);
   if (time > time_max) {
     error_condition |= E_TIME_MAX;
   }
+  Serial.println(time);
 }
 
-static void check_Tl_duration() {
-  if (time - Tl_time_start > Tp_duration) {
+static void check_Ts_duration_min() {
+  if (disable_checks)
+    return;
+  Tl_time_end = time;
+  if (time - Tl_time_start < Tl_duration_min) {
+    error_condition |= E_TL_TOO_SHORT;
+  }
+}
+
+static void check_Ts_duration_max() {
+  if (disable_checks)
+    return;
+  if (time - Ts_time_start > Tl_duration_max) {
+    error_condition |= E_TS_TOO_LONG;
+  }
+}
+
+
+static void check_Tl_duration_min() {
+  if (disable_checks)
+    return;
+  Tl_time_end = time;
+  if (time - Tl_time_start < Tl_duration_min) {
+    error_condition |= E_TL_TOO_SHORT;
+  }
+}
+
+static void check_Tl_duration_max() {
+  if (disable_checks)
+    return;
+  if (time - Tl_time_start > Tl_duration_max) {
     error_condition |= E_TL_TOO_LONG;
   }
 }
 
-static void check_Tp_duration() {
-  if (time - Tp_time_start > Tp_duration) {
+static void check_Tp_duration_min() {
+  Tp_time_end = time;
+  if (time - Tp_time_start < Tp_duration_min) {
+    error_condition |= E_TP_TOO_SHORT;
+  }
+}
+
+static void check_Tp_duration_max() {
+  if (disable_checks)
+    return;
+  if (time - Tp_time_start > Tp_duration_max) {
     error_condition |= E_TP_TOO_LONG;
   }
 }
@@ -208,22 +260,27 @@ static void set_error_state() {
 
 
 static void handle_start_state() {
-  if (temperature > Ts_min) {
-    Ts_min_time = time;
+  check_max_duration();
+  Serial.println(time);
+   if (temperature > Ts_min) {
+    Ts_time_start = time;
     set_preheat_state();
   }
 }
 
 
 static void handle_preheat_state() {
+  check_Ts_duration_max();
+  check_max_duration();
   if (temperature > Ts_max) {
-    Ts_max_time = time;
+    check_Ts_duration_min();
     set_ramp_up_state();
   }
 }
 
 
 static void handle_ramp_up_state() {
+  check_max_duration();
   if (temperature > Tl) {
     Tl_time_start = time;
     set_tal_first_state();
@@ -232,7 +289,8 @@ static void handle_ramp_up_state() {
 
 
 static void handle_tal_first_state() {
-  check_Tl_duration();
+  check_max_duration();
+  check_Tl_duration_max();
   if (temperature > Tp - 5) {
     Tp_time_start = time;
     set_peak_state();
@@ -241,18 +299,19 @@ static void handle_tal_first_state() {
 
 
 static void handle_peak_state() {
-  check_Tl_duration();
-  check_Tp_duration();
-  if (time - Tp_time_start > Tp_duration) {
-    Tp_time_end = time;
+  check_Tl_duration_max();
+  check_Tp_duration_max();
+  if (time - Tp_time_start > Tp_duration_max) {
+    check_Tp_duration_min();
     set_tal_second_state();
    }
 }
 
 
 static void handle_tal_second_state() {
-  check_Tl_duration();
+  check_Tl_duration_max();
   if (temperature < Tl) {
+    check_Tl_duration_min();
     set_ramp_down_state();
   }
 }
@@ -265,9 +324,9 @@ static void handle_ramp_down_state() {
 
 
 static void handle_end_state() {
-  while(true) {
-    continue;
-  }
+//   while(true) {
+//     continue;
+//   }
 }
 
 
@@ -286,9 +345,17 @@ static void handle_error_state() {
     Serial.println("Error: delta °K/second too big");
   if (error_condition & E_TIME_MAX)
     Serial.println("Error: reflow process does take too long");
+  if (error_condition & E_TS_TOO_SHORT)
+    Serial.println("Error: heatup duration was too short");
+  if (error_condition & E_TS_TOO_LONG)
+    Serial.println("Error: heatup duration was too long");
+  if (error_condition & E_TL_TOO_SHORT)
+    Serial.println("Error: temperature above liquidus duration was too short");
   if (error_condition & E_TL_TOO_LONG)
-    Serial.println("Error: temperature above liquidus was too long");
+    Serial.println("Error: temperature above liquidus duration was too long");
   if (error_condition & E_TP_TOO_LONG)
+    Serial.println("Error: peak temperature duration was too short");
+  if (error_condition & E_TP_TOO_SHORT)
     Serial.println("Error: peak temperature duration was too long");
 }
 
@@ -297,15 +364,13 @@ void loop() {
   time = millis() / 1000;
   get_temp();
   check_dt();
-  check_max_duration();
 
-  if (error_condition) {
-    set_error_state();
-  }
-  else {
+  if (!error_condition) {
     print_debug();
   }
-
+  else {
+    set_error_state();
+  }
 
   switch (state) {
       case START_STATE: