diff --git a/img/TimeBomb.png b/img/TimeBomb.png
new file mode 100644
index 0000000..d7d648f
Binary files /dev/null and b/img/TimeBomb.png differ
diff --git a/img/thumbnail-39.jpg b/img/thumbnail-39.jpg
new file mode 100644
index 0000000..0f46626
Binary files /dev/null and b/img/thumbnail-39.jpg differ
diff --git a/lesson-08/main.c b/lesson-08/main.c
index 2c1c2c6..16d384b 100644
--- a/lesson-08/main.c
+++ b/lesson-08/main.c
@@ -7,8 +7,7 @@
 void delay(int iter);
 
 void delay(int iter) {
-    int volatile counter;
-    counter = 0;
+    int volatile counter = 0;
     while (counter < iter) {  // delay loop
         ++counter;
     }
diff --git a/lesson-08/project.ewp b/lesson-08/project.ewp
index 7194d95..6870bb8 100644
--- a/lesson-08/project.ewp
+++ b/lesson-08/project.ewp
@@ -716,7 +716,7 @@
                 </option>
                 <option>
                     <name>IlinkMapFile</name>
-                    <state>0</state>
+                    <state>1</state>
                 </option>
                 <option>
                     <name>IlinkLogFile</name>
diff --git a/lesson-39/README.md b/lesson-39/README.md
new file mode 100644
index 0000000..f0f8d04
--- /dev/null
+++ b/lesson-39/README.md
@@ -0,0 +1,41 @@
+## Brought to you by:
+[![Quantum Leaps](https://www.state-machine.com/attachments/logo_ql_400.png)](https://www.state-machine.com)
+
+---------------------------------------------------------------------
+[![TimeBomb model in QM](../img/thumbnail-39.jpg)](https://youtu.be/FCymm6PBtOs)
+
+# About this example:
+This is a model of a "TimeBomb" presented in
+[lesson #39 "Optimal State Machine Implementation in C](https://youtu.be/FCymm6PBtOs)
+of the ["Modern Embedded Programming" video course](https://www.youtube.com/playlist?list=PLPW8O6W-1chwyTzI3BHwBLbGQoPFxPAPM).
+
+The "TimeBomb" state machine is independent from any specific board,
+but assumes the presence of a few LEDs, which are controlled via a BSP
+(Board Support Package)
+
+This example demonstrates:
+- Active object (TimeBomb) with state machine
+- Board Support Package abstraction for portability
+
+
+# TimbeBomb state machine
+The TimeBomb state machine has been drawn in the freeware
+[QM modeling tool](https://github.com/QuantumLeaps/qm):
+
+[![TimeBomb model in QM](../img/TimeBomb.png)](https://github.com/QuantumLeaps/qm)
+
+# Building the example:
+To build this example, you will need the QP/C framework installed on your computer and the KEIL uVision toolset (could be the free edition).
+
+# Running the example:
+This example can be run on the TivaC LaunchPad board, but should
+be also easy to port to other boards.
+
+For more QM examples for QP/C see:
+https://www.state-machine.com/qpc/exa.html
+
+# How to Help this Project?
+If you like this project, please give it a star (in the upper-right corner of your browser window):
+
+![GitHub star](../img/github-star.jpg)
+
diff --git a/lesson-39/TimeBomb.qm b/lesson-39/TimeBomb.qm
index 43494bb..5adacd5 100644
--- a/lesson-39/TimeBomb.qm
+++ b/lesson-39/TimeBomb.qm
@@ -1,27 +1,25 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<model version="5.1.1" links="1">
+<model version="5.2.2" links="1">
  <documentation>About this example:
 -------------------
-Simple &quot;Blinky&quot; console application for workstations (Windows, Linux, MacOS)
-(see &quot;QM Tutorial&quot; at: https://www.state-machine.com/qm/gs_tut.html)
+This is a model of a &quot;TimeBomb&quot; presented in lesson #39 of the
+&quot;Modern Embedded Programming&quot; video course. The &quot;TimeBomb&quot; state
+machine is independent from any specific board, but assumes the
+presence of a few LEDs, which are controlled via a BSP (Board
+Support Package)
 
 This example demonstrates:
-- Active object (Blinky) with state machine
+- Active object (TimeBomb) with state machine
 - Board Support Package abstraction for portability
-- BSP implementation for desktop OS (Windows, Linux, MacOS)
-- Platform-independent main() function
-- Makefile to build the generated code on desktop OS (Windows, Linux, MacOS)
-- Customized tools for building the generated code directly from QM
 
 Building the example:
 ---------------------
-To build this example, you will need the QP/C framework installed on your computer and the GNU-GCC compiler. Both of them will be available if you install the QP-bundle from:
-
-https://www.state-machine.com/#Downloads
+To build this example, you will need the QP/C framework installed on your computer and the KEIL uVision toolset (could be the free edition).
 
 Running the example:
 --------------------
-This example is a simple console application, which you can run from a terminal.
+This example can be run on the TivaC LaunchPad board, but should
+be also easy to port to other boards.
 
 For more QM examples for QP/C see:
 https://www.state-machine.com/qpc/exa.html</documentation>
@@ -107,375 +105,8 @@ https://www.state-machine.com/qpc/exa.html</documentation>
       <entry box="1,2,17,3"/>
      </state_glyph>
     </state>
-    <state_diagram size="68,80"/>
+    <state_diagram size="50,74"/>
    </statechart>
   </class>
-  <!--${AOs::Blinky_ctor}-->
-  <operation name="Blinky_ctor" type="void" visibility="0x00" properties="0x01">
-   <documentation>The Blinky &quot;constructor&quot; is provided outside of the Blinky class, so that it can be used independently from the class. This is part of the &quot;opaque pointer&quot; design idiom.</documentation>
-   <code>Blinky *me = (Blinky *)AO_Blinky;
-QActive_ctor(&amp;me-&gt;super, Q_STATE_CAST(&amp;Blinky_initial));
-QTimeEvt_ctorX(&amp;me-&gt;timeEvt, &amp;me-&gt;super, TIMEOUT_SIG, 0U);</code>
-  </operation>
  </package>
- <!--${.}-->
- <directory name=".">
-  <!--${.::blinky.c}-->
-  <file name="blinky.c">
-   <text>#include &quot;qpc.h&quot;    /* QP/C framework API */
-#include &quot;bsp.h&quot;    /* Board Support Package interface */
-
-/* ask QM to declare the Blinky class --------------------------------------*/
-$declare${AOs::Blinky}
-
-/* instantiate the Blinky active object ------------------------------------*/
-static Blinky l_blinky;
-QActive * const AO_Blinky = &amp;l_blinky.super;
-
-/* ask QM to define the Blinky class ---------------------------------------*/
-$define${AOs::Blinky_ctor}
-$define${AOs::Blinky}</text>
-  </file>
-  <!--${.::bsp.h}-->
-  <file name="bsp.h">
-   <text>#ifndef BSP_H
-#define BSP_H
-
-/* a very simple Board Support Package (BSP) -------------------------------*/
-enum { BSP_TICKS_PER_SEC = 100 }; /* number of clock ticks in a second */
-void BSP_init(void);
-void BSP_ledOff(void);
-void BSP_ledOn(void);
-
-/* define the event signals used in the application ------------------------*/
-enum BlinkySignals {
-    TIMEOUT_SIG = Q_USER_SIG, /* offset the first signal by Q_USER_SIG */
-    MAX_SIG /* keep last (the number of signals) */
-};
-
-/* active object(s) used in this application -------------------------------*/
-extern QActive * const AO_Blinky; /* opaque pointer to the Blinky AO */
-$declare${AOs::Blinky_ctor}
-
-#endif /* BSP_H */</text>
-  </file>
-  <!--${.::bsp.c}-->
-  <file name="bsp.c">
-   <text>/* Board Support Package implementation for desktop OS (Windows, Linux, MacOS) */
-#include &quot;qpc.h&quot;    /* QP/C framework API */
-#include &quot;bsp.h&quot;    /* Board Support Package interface */
-#include &lt;stdio.h&gt;  /* for printf()/fprintf() */
-#include &lt;stdlib.h&gt; /* for exit() */
-
-void BSP_init(void)   {
-    printf(&quot;Simple Blinky example\n&quot;
-           &quot;QP/C version: %s\n&quot;
-           &quot;Press Ctrl-C to quit...\n&quot;,
-           QP_VERSION_STR);
-}
-void BSP_ledOff(void) { printf(&quot;LED OFF\n&quot;); }
-void BSP_ledOn(void)  { printf(&quot;LED ON\n&quot;);  }
-
-/* callback functions needed by the framework ------------------------------*/
-void QF_onStartup(void) {}
-void QF_onCleanup(void) {}
-void QF_onClockTick(void) {
-    QF_TICK_X(0U, (void *)0); /* QF clock tick processing for rate 0 */
-}
-void Q_onAssert(char const * const module, int loc) {
-    fprintf(stderr, &quot;Assertion failed in %s:%d&quot;, module, loc);
-    exit(-1);
-}</text>
-  </file>
-  <!--${.::main.c}-->
-  <file name="main.c">
-   <text>#include &quot;qpc.h&quot;    /* QP/C framework API */
-#include &quot;bsp.h&quot;    /* Board Support Package interface */
-
-Q_DEFINE_THIS_FILE
-
-/* the main function -------------------------------------------------------*/
-int main() {
-    static QEvt const *blinky_queueSto[10]; /* event queue buffer for Blinky */
-
-    QF_init();  /* initialize the framework */
-    BSP_init(); /* initialize the BSP */
-
-    /* instantiate and start the Blinky active object */
-    Blinky_ctor(); /* in C you must explicitly call the Blinky constructor */
-    QACTIVE_START(AO_Blinky, /* active object to start */
-        1U,                  /* priority of the active object */
-        blinky_queueSto,     /* event queue buffer */
-        Q_DIM(blinky_queueSto), /* the length of the buffer */
-        (void *)0, 0U,       /* private stack (not used) */
-        (QEvt *)0);          /* initialization event (not used) */
-
-    return QF_run(); /* let the framework run the application */
-}</text>
-  </file>
-  <!--${.::Makefile}-->
-  <file name="Makefile">
-   <text># Makefile for building QP/C application on Windows and POSIX hosts
-#
-# examples of invoking this Makefile:
-# building configurations: Debug (default), Release, and Spy
-# make
-# make CONF=rel
-# make CONF=spy
-# make clean   # cleanup the build
-# make CONF=spy clean   # cleanup the build
-#
-# NOTE:
-# To use this Makefile on Windows, you will need the GNU make utility, which
-# is included in the QTools collection for Windows, see:
-#    https://sourceforge.net/projects/qpc/files/QTools/
-#
-
-#-----------------------------------------------------------------------------
-# project name:
-#
-PROJECT := blinky
-
-#-----------------------------------------------------------------------------
-# project directories:
-#
-
-# list of all source directories used by this project
-VPATH := . \
-
-# list of all include directories needed by this project
-INCLUDES := -I. \
-
-# location of the QP/C framework (if not provided in an env. variable)
-ifeq ($(QPC),)
-QPC := ../../..
-endif
-
-#-----------------------------------------------------------------------------
-# project files:
-#
-
-# C source files...
-C_SRCS := \
-    blinky.c \
-    bsp.c \
-    main.c
-
-# C++ source files...
-CPP_SRCS :=
-
-LIB_DIRS  :=
-LIBS      :=
-
-# defines...
-# QP_API_VERSION controls the QP API compatibility; 9999 means the latest API
-DEFINES   := -DQP_API_VERSION=9999
-
-ifeq (,$(CONF))
-    CONF := dbg
-endif
-
-#-----------------------------------------------------------------------------
-# add QP/C framework (depends on the OS this Makefile runs on):
-#
-ifeq ($(OS),Windows_NT)
-
-# NOTE:
-# For Windows hosts, you can choose:
-# - the single-threaded QP/C port (win32-qv) or
-# - the multithreaded QP/C port (win32).
-#
-QP_PORT_DIR := $(QPC)/ports/win32-qv
-#QP_PORT_DIR := $(QPC)/ports/win32
-LIB_DIRS += -L$(QP_PORT_DIR)/$(CONF)
-LIBS     += -lqp -lws2_32
-
-else
-
-# NOTE:
-# For POSIX hosts (Linux, MacOS), you can choose:
-# - the single-threaded QP/C port (win32-qv) or
-# - the multithreaded QP/C port (win32).
-#
-QP_PORT_DIR := $(QPC)/ports/posix-qv
-#QP_PORT_DIR := $(QPC)/ports/posix
-
-C_SRCS += \
-    qep_hsm.c \
-    qep_msm.c \
-    qf_act.c \
-    qf_actq.c \
-    qf_defer.c \
-    qf_dyn.c \
-    qf_mem.c \
-    qf_ps.c \
-    qf_qact.c \
-    qf_qeq.c \
-    qf_qmact.c \
-    qf_time.c \
-    qf_port.c
-
-QS_SRCS := \
-    qs.c \
-    qs_64bit.c \
-    qs_rx.c \
-    qs_fp.c \
-    qs_port.c
-
-LIBS += -lpthread
-
-endif
-
-#============================================================================
-# Typically you should not need to change anything below this line
-
-VPATH    += $(QPC)/src/qf $(QP_PORT_DIR)
-INCLUDES += -I$(QPC)/include -I$(QPC)/src -I$(QP_PORT_DIR)
-
-#-----------------------------------------------------------------------------
-# GNU toolset:
-#
-# NOTE:
-# GNU toolset (MinGW) is included in the QTools collection for Windows, see:
-#     http://sourceforge.net/projects/qpc/files/QTools/
-# It is assumed that %QTOOLS%\bin directory is added to the PATH
-#
-CC    := gcc
-CPP   := g++
-LINK  := gcc    # for C programs
-#LINK  := g++   # for C++ programs
-
-#-----------------------------------------------------------------------------
-# basic utilities (depends on the OS this Makefile runs on):
-#
-ifeq ($(OS),Windows_NT)
-    MKDIR      := mkdir
-    RM         := rm
-    TARGET_EXT := .exe
-else ifeq ($(OSTYPE),cygwin)
-    MKDIR      := mkdir -p
-    RM         := rm -f
-    TARGET_EXT := .exe
-else
-    MKDIR      := mkdir -p
-    RM         := rm -f
-    TARGET_EXT :=
-endif
-
-#-----------------------------------------------------------------------------
-# build configurations...
-
-ifeq (rel, $(CONF)) # Release configuration ..................................
-
-BIN_DIR := build_rel
-# gcc options:
-CFLAGS  = -c -O3 -fno-pie -std=c99 -pedantic -Wall -Wextra -W \
-    $(INCLUDES) $(DEFINES) -DNDEBUG
-
-CPPFLAGS = -c -O3 -fno-pie -std=c++11 -pedantic -Wall -Wextra \
-    -fno-rtti -fno-exceptions \
-    $(INCLUDES) $(DEFINES) -DNDEBUG
-
-else ifeq (spy, $(CONF))  # Spy configuration ................................
-
-BIN_DIR := build_spy
-
-C_SRCS   += $(QS_SRCS)
-VPATH    += $(QPC)/src/qs
-
-# gcc options:
-CFLAGS  = -c -g -O -fno-pie -std=c99 -pedantic -Wall -Wextra -W \
-    $(INCLUDES) $(DEFINES) -DQ_SPY
-
-CPPFLAGS = -c -g -O -fno-pie -std=c++11 -pedantic -Wall -Wextra \
-    -fno-rtti -fno-exceptions \
-    $(INCLUDES) $(DEFINES) -DQ_SPY
-
-else # default Debug configuration .........................................
-
-BIN_DIR := build
-
-# gcc options:
-CFLAGS  = -c -g -O -fno-pie -std=c99 -pedantic -Wall -Wextra -W \
-    $(INCLUDES) $(DEFINES)
-
-CPPFLAGS = -c -g -O -fno-pie -std=c++11 -pedantic -Wall -Wextra \
-    -fno-rtti -fno-exceptions \
-    $(INCLUDES) $(DEFINES)
-
-endif  # .....................................................................
-
-LINKFLAGS := -no-pie
-
-#-----------------------------------------------------------------------------
-C_OBJS       := $(patsubst %.c,%.o,   $(C_SRCS))
-CPP_OBJS     := $(patsubst %.cpp,%.o, $(CPP_SRCS))
-
-TARGET_EXE   := $(BIN_DIR)/$(PROJECT)$(TARGET_EXT)
-C_OBJS_EXT   := $(addprefix $(BIN_DIR)/, $(C_OBJS))
-C_DEPS_EXT   := $(patsubst %.o,%.d, $(C_OBJS_EXT))
-CPP_OBJS_EXT := $(addprefix $(BIN_DIR)/, $(CPP_OBJS))
-CPP_DEPS_EXT := $(patsubst %.o,%.d, $(CPP_OBJS_EXT))
-
-# create $(BIN_DIR) if it does not exist
-ifeq (&quot;$(wildcard $(BIN_DIR))&quot;,&quot;&quot;)
-$(shell $(MKDIR) $(BIN_DIR))
-endif
-
-#-----------------------------------------------------------------------------
-# rules
-#
-
-all: $(TARGET_EXE)
-
-$(TARGET_EXE) : $(C_OBJS_EXT) $(CPP_OBJS_EXT)
-    $(CC) $(CFLAGS) $(QPC)/include/qstamp.c -o $(BIN_DIR)/qstamp.o
-    $(LINK) $(LINKFLAGS) $(LIB_DIRS) -o $@ $^ $(BIN_DIR)/qstamp.o $(LIBS)
-
-$(BIN_DIR)/%.d : %.c
-    $(CC) -MM -MT $(@:.d=.o) $(CFLAGS) $&lt; &gt; $@
-
-$(BIN_DIR)/%.d : %.cpp
-    $(CPP) -MM -MT $(@:.d=.o) $(CPPFLAGS) $&lt; &gt; $@
-
-$(BIN_DIR)/%.o : %.c
-    $(CC) $(CFLAGS) $&lt; -o $@
-
-$(BIN_DIR)/%.o : %.cpp
-    $(CPP) $(CPPFLAGS) $&lt; -o $@
-
-.PHONY : clean show
-
-# include dependency files only if our goal depends on their existence
-ifneq ($(MAKECMDGOALS),clean)
-  ifneq ($(MAKECMDGOALS),show)
--include $(C_DEPS_EXT) $(CPP_DEPS_EXT)
-  endif
-endif
-
-.PHONY : clean show
-
-clean :
-    -$(RM) $(BIN_DIR)/*.o \
-    $(BIN_DIR)/*.d \
-    $(TARGET_EXE)
-
-show :
-    @echo PROJECT      = $(PROJECT)
-    @echo TARGET_EXE   = $(TARGET_EXE)
-    @echo VPATH        = $(VPATH)
-    @echo C_SRCS       = $(C_SRCS)
-    @echo CPP_SRCS     = $(CPP_SRCS)
-    @echo C_DEPS_EXT   = $(C_DEPS_EXT)
-    @echo C_OBJS_EXT   = $(C_OBJS_EXT)
-    @echo C_DEPS_EXT   = $(C_DEPS_EXT)
-    @echo CPP_DEPS_EXT = $(CPP_DEPS_EXT)
-    @echo CPP_OBJS_EXT = $(CPP_OBJS_EXT)
-    @echo LIB_DIRS     = $(LIB_DIRS)
-    @echo LIBS         = $(LIBS)
-    @echo DEFINES      = $(DEFINES)
-
-</text>
-  </file>
- </directory>
 </model>
diff --git a/lesson-40/.TimeBomb b/lesson-40/.TimeBomb
deleted file mode 100644
index 5178d1d..0000000
--- a/lesson-40/.TimeBomb
+++ /dev/null
@@ -1,61 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<session version="5.2.1">
- <item name="license"></item>
- <group name="locked"/>
- <group name="settings">
-  <item name="tabs">1</item>
-  <item name="windows">0</item>
-  <item name="grid">3</item>
-  <item name="backups">0</item>
- </group>
- <group name="windows">
-  <item id="AOs::TimeBomb::SM">0,0,583,1275,*</item>
- </group>
- <group name="search">
-  <item name="options">2032128</item>
-  <item name="replace">0</item>
- </group>
- <group name="vars"/>
- <group name="tools">
-  <group name="tool">
-   <item name="icon">0</item>
-   <item name="title"></item>
-   <item name="command"></item>
-   <item name="args"></item>
-   <item name="dir"></item>
-   <item name="options">0</item>
-  </group>
-  <group name="tool">
-   <item name="icon">0</item>
-   <item name="title"></item>
-   <item name="command"></item>
-   <item name="args"></item>
-   <item name="dir"></item>
-   <item name="options">0</item>
-  </group>
-  <group name="tool">
-   <item name="icon">0</item>
-   <item name="title"></item>
-   <item name="command"></item>
-   <item name="args"></item>
-   <item name="dir"></item>
-   <item name="options">0</item>
-  </group>
-  <group name="tool">
-   <item name="icon">0</item>
-   <item name="title"></item>
-   <item name="command"></item>
-   <item name="args"></item>
-   <item name="dir"></item>
-   <item name="options">0</item>
-  </group>
-  <group name="tool">
-   <item name="icon">0</item>
-   <item name="title"></item>
-   <item name="command"></item>
-   <item name="args"></item>
-   <item name="dir"></item>
-   <item name="options">0</item>
-  </group>
- </group>
-</session>