/* 
ODD EVEN RANDOM GENERATOR WITH BLINKING LED INDICATOR
A random number is generated seeded by reading analog noise on a floating pin
%2 is performed as the odd-even test and an LED is lit depending on the result
*/
#define REDLED A5
#define BLUELED A4
#define PAUSE 10
#define BUZZPIN 2
long randomNumber;
long counter;
long oddCount;
long evenCount;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(REDLED, OUTPUT);
  pinMode(BLUELED, OUTPUT);
  pinMode(BUZZPIN, OUTPUT);
  counter = 0;
  oddCount = 0;
  evenCount = 0;
  randomSeed(analogRead(A3));

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(REDLED, LOW);
  digitalWrite(BLUELED, LOW);
  randomNumber = random(0, 1000000);
  Serial.println("Next number is .....");
  Serial.print(randomNumber);
  Serial.print(" : ");
  if (randomNumber %2 == 1){       //if randomNumber is an odd number
  digitalWrite(REDLED, HIGH);
  oddCount++;
  Serial.println("ODD");
  } else {                         //if randomNumber is an even number
  digitalWrite(BLUELED, HIGH);    
  Serial.println("EVEN");
  evenCount++;
  }

  delay(PAUSE);                    //Give time to show which LED is lit
  counter++;

  if (counter%100 == 0) {          //Display count for every 100 cycles
    digitalWrite(REDLED, HIGH);
    digitalWrite(BLUELED, HIGH);
    Serial.print("After ");
    Serial.print(counter);
    Serial.println(" counts:");
    Serial.print("ODD = ");
    Serial.println(oddCount);
    Serial.print("Even = ");
    Serial.println(evenCount);
    digitalWrite(BUZZPIN, HIGH);
    delay(PAUSE*300);
    digitalWrite(BUZZPIN, LOW);
  }

}