diff --git a/examples/arduino/EspLinkSample/EspLinkSample.ino b/examples/arduino/EspLinkSample/EspLinkSample.ino
index ab672b0..c776994 100644
--- a/examples/arduino/EspLinkSample/EspLinkSample.ino
+++ b/examples/arduino/EspLinkSample/EspLinkSample.ino
@@ -3,9 +3,11 @@
 
 #define LED_PIN  13
 
-int8_t blinking = 0;
-int8_t frequency = 10;
+int8_t  blinking = 0;
+int8_t  frequency = 10;
+uint8_t pattern = 2;
 uint16_t elapse = 100;
+uint16_t elapse_delta = 200;
 uint32_t next_ts = 0;
 
 void ledHtmlCallback(WebServerCommand command, char * data, int dataLen);
@@ -38,6 +40,7 @@ void loop()
     {
       digitalWrite(LED_PIN, !digitalRead(LED_PIN));
       next_ts += elapse;
+      elapse = elapse_delta - elapse;
     }
   }
 }
@@ -66,12 +69,41 @@ void ledHtmlCallback(WebServerCommand command, char * data, int dataLen)
       if( strcmp_P(data, PSTR("frequency") ) == 0 )
       {
         frequency = webServer.getArgInt();
-        elapse = 1000 / frequency;
+        digitalWrite(LED_PIN, false);
+        elapse_delta = 2000 / frequency;
+        elapse = pattern * elapse_delta / 4;
+      }
+      else if( strcmp_P(data, PSTR("pattern") ) == 0 )
+      {
+        char * arg = webServer.getArgString();
+
+        if( strcmp_P(arg, PSTR("25_75")) == 0 )
+          pattern = 1;
+        else if( strcmp_P(arg, PSTR("50_50")) == 0 )
+          pattern = 2;
+        else if( strcmp_P(arg, PSTR("75_25")) == 0 )
+          pattern = 3;
+
+        digitalWrite(LED_PIN, false);
+        elapse = pattern * elapse_delta / 4;
       }
       break;
     case LOAD:
-      webServer.setArgNum(2);
+      webServer.setArgNum(3);
       webServer.setArgInt("frequency", frequency);
+
+      switch(pattern)
+      {
+        case 1:
+          webServer.setArgStringP("pattern", PSTR("25_75"));
+          break;
+        case 2:
+          webServer.setArgStringP("pattern", PSTR("50_50"));
+          break;
+        case 3:
+          webServer.setArgStringP("pattern", PSTR("75_25"));
+          break;
+      }
     case REFRESH:
       if( command == REFRESH )
         webServer.setArgNum(1);
diff --git a/examples/arduino/EspLinkSample/WebServer.cpp b/examples/arduino/EspLinkSample/WebServer.cpp
index 5e100d5..7aab354 100644
--- a/examples/arduino/EspLinkSample/WebServer.cpp
+++ b/examples/arduino/EspLinkSample/WebServer.cpp
@@ -182,3 +182,8 @@ int32_t WebServer::getArgInt()
   return (int32_t)atol(value_ptr);
 }
 
+char * WebServer::getArgString()
+{
+  return value_ptr;
+}
+
diff --git a/examples/arduino/EspLinkSample/WebServer.h b/examples/arduino/EspLinkSample/WebServer.h
index 6d70817..28365be 100644
--- a/examples/arduino/EspLinkSample/WebServer.h
+++ b/examples/arduino/EspLinkSample/WebServer.h
@@ -77,6 +77,7 @@ class WebServer
     void               setArgStringP(const char * name, const char * value);
 
     int32_t            getArgInt();
+    char *             getArgString();
 };
 
 #endif /* WEB_SERVER_H */