void setup() {

  Serial.begin(9600);

}

void loop() {

  for (int count = 0; count < 10; count++) {

    Serial.print("Hello World!!");

  }

  for (int count2 = 0; count2 < 10; count2++) {

    Serial.println("Hello World!!");

  }

}

boolean SwSt;

int pinLed = 8;

int pinSw = 9;

void setup() {

  Serial.begin(9600);

  pinMode(pinLed, OUTPUT);

  pinMode(pinSw, INPUT);

  digitalWrite(pinLed, LOW);

}

void loop() {

  SwSt = digitalRead(pinSw);

  if (SwSt == 1) {

    digitalWrite(pinLed, HIGH);

    Serial.println("SW ON");

  } else {

    digitalWrite(pinLed, LOW);

    Serial.println("SW OFF");

  }

}

int InData;

void setup()

{

  InData = 0;

  Serial.begin(9600);

}

void loop()

{

  if (Serial.available() > 0) {

    InData = Serial.read();

    Serial.print("I received:");

    Serial.println(InData);

  }

}

int InData;

void setup()

{

  pinMode(8, OUTPUT);

  InData = 0;

  digitalWrite(8, LOW);

  Serial.begin(9600);

}

void loop()

{

  if (Serial.available() > 0) {

    InData = Serial.read();

    Serial.print("I received:");

    Serial.println(InData);

  }

  if (InData == 97) {

    digitalWrite(8, HIGH);

  } else if (InData == 98) {

    digitalWrite(8, LOW);

  }

}