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+.. _arduino-random:
+
+random()
+========
+
+Description
+-----------
+
+The random function generates pseudo-random numbers.
+
+
+
+Syntax
+------
+
+random(max)
+random(min, max)
+
+
+
+Parameters
+----------
+
+min - lower bound of the random value, inclusive *(optional)*
+
+
+
+max - upper bound of the random value, exclusive
+
+
+
+Returns
+-------
+
+a random number between min and max-1 (*long*)
+
+
+
+Note:
+-----
+
+If it is important for a sequence of values generated by random()
+to differ, on subsequent executions of a sketch, use randomSeed()
+to initialize the random number generator with a fairly random
+input, such as analogRead() on an unconnected pin.
+
+
+
+Conversely, it can occasionally be useful to use pseudo-random
+sequences that repeat exactly. This can be accomplished by calling
+randomSeed() with a fixed number, before starting the random
+sequence.
+
+
+
+Example
+-------
+
+::
+
+    long randNumber;
+    
+    void setup(){
+      Serial.begin(9600);
+    
+      // if analog input pin 0 is unconnected, random analog
+      // noise will cause the call to randomSeed() to generate
+      // different seed numbers each time the sketch runs.
+      // randomSeed() will then shuffle the random function.
+      randomSeed(analogRead(0));
+    }
+    
+    void loop() {
+      // print a random number from 0 to 299
+      randNumber = random(300);
+      Serial.println(randNumber);  
+    
+      // print a random number from 10 to 19
+      randNumber = random(10, 20);
+      Serial.println(randNumber);
+    
+      delay(50);
+    }
+
+
+
+See also
+--------
+
+
+-  `randomSeed <http://arduino.cc/en/Reference/RandomSeed>`_\ ()
+