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-.. _arduino-static:
-
-Static
-======
-
-The static keyword is used to create variables that are visible to
-only one function. However unlike local variables that get created
-and destroyed every time a function is called, static variables
-persist beyond the function call, preserving their data between
-function calls.
-
-
-
-Variables declared as static will only be created and initialized
-the first time a function is called.
-
-
-
-Example
--------
-
-::
-
-    
-    
-    /* RandomWalk
-    * Paul Badger 2007
-    * RandomWalk wanders up and down randomly between two
-    * endpoints. The maximum move in one loop is governed by
-    * the parameter "stepsize".
-    * A static variable is moved up and down a random amount.
-    * This technique is also known as "pink noise" and "drunken walk".
-    */
-    
-    #define randomWalkLowRange -20
-    #define randomWalkHighRange 20
-    int stepsize;
-    
-    int thisTime;
-    int total;
-    
-    void setup()
-    {
-      Serial.begin(9600);
-    }
-    
-    void loop()
-    {        //  tetst randomWalk function
-      stepsize = 5;
-      thisTime = randomWalk(stepsize);
-      Serial.println(thisTime);
-       delay(10);
-    }
-    
-    int randomWalk(int moveSize){
-      static int  place;     // variable to store value in random walk - declared static so that it stores
-                             // values in between function calls, but no other functions can change its value
-    
-      place = place + (random(-moveSize, moveSize + 1));
-    
-      if (place < randomWalkLowRange){                    // check lower and upper limits
-        place = place + (randomWalkLowRange - place);     // reflect number back in positive direction
-      }
-      else if(place > randomWalkHighRange){
-        place = place - (place - randomWalkHighRange);     // reflect number back in negative direction
-      }
-    
-      return place;
-    }
-    
-