diff --git a/02-UML/ST_BLINKER.uxf b/02-UML/ST_BLINKER.uxf
new file mode 100644
index 0000000..6c56d48
--- /dev/null
+++ b/02-UML/ST_BLINKER.uxf
@@ -0,0 +1,183 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<diagram program="umlet" version="15.1">
+  <zoom_level>17</zoom_level>
+  <element>
+    <id>UMLSpecialState</id>
+    <coordinates>
+      <x>646</x>
+      <y>51</y>
+      <w>34</w>
+      <h>34</h>
+    </coordinates>
+    <panel_attributes>type=initial</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>646</x>
+      <y>68</y>
+      <w>153</w>
+      <h>153</h>
+    </coordinates>
+    <panel_attributes>lt=-&gt;
+evBLInit</panel_attributes>
+    <additional_attributes>10.0;10.0;10.0;70.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLState</id>
+    <coordinates>
+      <x>510</x>
+      <y>187</y>
+      <w>306</w>
+      <h>85</h>
+    </coordinates>
+    <panel_attributes>ST_WAIT
+--
+remainBlinks = 3;</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLState</id>
+    <coordinates>
+      <x>510</x>
+      <y>374</y>
+      <w>306</w>
+      <h>102</h>
+    </coordinates>
+    <panel_attributes>ST_ON
+--
+if(blink3) remainBlinks--
+-.
+/ entry: turnOn()</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>646</x>
+      <y>459</y>
+      <w>153</w>
+      <h>136</h>
+    </coordinates>
+    <panel_attributes>lt=-&gt;
+evTimer</panel_attributes>
+    <additional_attributes>10.0;10.0;10.0;60.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLState</id>
+    <coordinates>
+      <x>544</x>
+      <y>561</y>
+      <w>238</w>
+      <h>102</h>
+    </coordinates>
+    <panel_attributes>ST_OFF
+--
+-.
+/ entry: turnOff()</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>646</x>
+      <y>646</y>
+      <w>153</w>
+      <h>153</h>
+    </coordinates>
+    <panel_attributes>lt=-&gt;
+evTimer</panel_attributes>
+    <additional_attributes>10.0;10.0;10.0;70.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>527</x>
+      <y>255</y>
+      <w>272</w>
+      <h>153</h>
+    </coordinates>
+    <panel_attributes>lt=-&gt;
+m1=evBlinkN
+m2=/ nBlinkIsOn = true</panel_attributes>
+    <additional_attributes>10.0;10.0;10.0;70.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>765</x>
+      <y>255</y>
+      <w>289</w>
+      <h>153</h>
+    </coordinates>
+    <panel_attributes>lt=-&gt;
+m1=evBlink
+m2=/ nBlinkIsOn = false</panel_attributes>
+    <additional_attributes>10.0;10.0;10.0;70.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLSpecialState</id>
+    <coordinates>
+      <x>629</x>
+      <y>765</y>
+      <w>68</w>
+      <h>68</h>
+    </coordinates>
+    <panel_attributes>type=decision</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>442</x>
+      <y>408</y>
+      <w>221</w>
+      <h>442</h>
+    </coordinates>
+    <panel_attributes>lt=-&gt;
+m1=[else]</panel_attributes>
+    <additional_attributes>110.0;230.0;10.0;230.0;10.0;10.0;40.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>680</x>
+      <y>204</y>
+      <w>391</w>
+      <h>646</h>
+    </coordinates>
+    <panel_attributes>lt=-&gt;
+m1=[remainBlinks==0]</panel_attributes>
+    <additional_attributes>10.0;350.0;210.0;350.0;210.0;10.0;80.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>1462</x>
+      <y>0</y>
+      <w>952</w>
+      <h>527</h>
+    </coordinates>
+    <panel_attributes>BLINKER
+--
++state: BLINKER_STATES
++tON: uint16_t
++tOFF: uint16_t
++blink3: bool
++nBlink: uint8_t
++turnOn: blinkerCallBack
++turnOff: blinkerCallBack
+--
++BLINKER_init(me: BLINKER*): void
++BLINKER_defineCallBack(f: fBlinkerCallBack, param: void*): blinkerCallBack
++BLINKER_starBehaviour(me: BLINKER*): void
++BLINKER_setTurnOn(me: BLINKER*, callBack: blinkerCallBack): void
++BLINKER_setTurnOff(me: BLINKER*, callBack: blinkerCallBack): void
++BLINKER_blink3(me: BLINKER*): void
++BLINKER_blink(me: BLINKER*): void
++BLINKER_processEvent(mev: Event*): bool
++BLINKER_endBlink(me: BLINKER*): void</panel_attributes>
+    <additional_attributes/>
+  </element>
+</diagram>
diff --git a/02-UML/ST_BUTTON.uxf b/02-UML/ST_BUTTON.uxf
index ae28134..6c15d78 100644
--- a/02-UML/ST_BUTTON.uxf
+++ b/02-UML/ST_BUTTON.uxf
@@ -4,8 +4,8 @@
   <element>
     <id>UMLSpecialState</id>
     <coordinates>
-      <x>1160</x>
-      <y>200</y>
+      <x>860</x>
+      <y>80</y>
       <w>40</w>
       <h>40</h>
     </coordinates>
@@ -15,8 +15,8 @@
   <element>
     <id>UMLState</id>
     <coordinates>
-      <x>680</x>
-      <y>520</y>
+      <x>380</x>
+      <y>400</y>
       <w>280</w>
       <h>80</h>
     </coordinates>
@@ -26,8 +26,8 @@
   <element>
     <id>UMLState</id>
     <coordinates>
-      <x>1400</x>
-      <y>520</y>
+      <x>1100</x>
+      <y>400</y>
       <w>280</w>
       <h>80</h>
     </coordinates>
@@ -37,8 +37,8 @@
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>1520</x>
-      <y>580</y>
+      <x>1220</x>
+      <y>460</y>
       <w>180</w>
       <h>240</h>
     </coordinates>
@@ -49,8 +49,8 @@ evPBPoll</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>1160</x>
-      <y>220</y>
+      <x>860</x>
+      <y>100</y>
       <w>180</w>
       <h>180</h>
     </coordinates>
@@ -61,8 +61,8 @@ evPBInit</panel_attributes>
   <element>
     <id>UMLSpecialState</id>
     <coordinates>
-      <x>1140</x>
-      <y>360</y>
+      <x>840</x>
+      <y>240</y>
       <w>80</w>
       <h>80</h>
     </coordinates>
@@ -72,8 +72,8 @@ evPBInit</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>800</x>
-      <y>380</y>
+      <x>500</x>
+      <y>260</y>
       <w>380</w>
       <h>180</h>
     </coordinates>
@@ -84,8 +84,8 @@ m1=[pB==1]</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>800</x>
-      <y>580</y>
+      <x>500</x>
+      <y>460</y>
       <w>180</w>
       <h>180</h>
     </coordinates>
@@ -96,8 +96,8 @@ evPBPoll</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>1200</x>
-      <y>380</y>
+      <x>900</x>
+      <y>260</y>
       <w>380</w>
       <h>180</h>
     </coordinates>
@@ -108,8 +108,8 @@ m1=[pB==0]</panel_attributes>
   <element>
     <id>UMLSpecialState</id>
     <coordinates>
-      <x>780</x>
-      <y>720</y>
+      <x>480</x>
+      <y>600</y>
       <w>80</w>
       <h>80</h>
     </coordinates>
@@ -119,8 +119,8 @@ m1=[pB==0]</panel_attributes>
   <element>
     <id>UMLSpecialState</id>
     <coordinates>
-      <x>1500</x>
-      <y>780</y>
+      <x>1200</x>
+      <y>660</y>
       <w>80</w>
       <h>80</h>
     </coordinates>
@@ -130,8 +130,8 @@ m1=[pB==0]</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>880</x>
-      <y>440</y>
+      <x>580</x>
+      <y>320</y>
       <w>660</w>
       <h>440</h>
     </coordinates>
@@ -142,8 +142,8 @@ m1=[pB==1] / pbPress()</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>840</x>
-      <y>440</y>
+      <x>540</x>
+      <y>320</y>
       <w>660</w>
       <h>380</h>
     </coordinates>
@@ -155,8 +155,8 @@ m1=[pB==0] / pbRelease()</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>600</x>
-      <y>440</y>
+      <x>300</x>
+      <y>320</y>
       <w>220</w>
       <h>380</h>
     </coordinates>
@@ -167,8 +167,8 @@ m1=[else]</panel_attributes>
   <element>
     <id>Relation</id>
     <coordinates>
-      <x>1560</x>
-      <y>440</y>
+      <x>1260</x>
+      <y>320</y>
       <w>220</w>
       <h>440</h>
     </coordinates>
@@ -179,8 +179,8 @@ m1=[else]</panel_attributes>
   <element>
     <id>UMLNote</id>
     <coordinates>
-      <x>1000</x>
-      <y>880</y>
+      <x>700</x>
+      <y>760</y>
       <w>400</w>
       <h>100</h>
     </coordinates>