Code for AO #15: Pull-Ups

/* Example using Internal Pull-Ups for Arduino or Energia (TI Launchpad)
** code used in AddOhms Video Tutorial #15: Pull-Ups and Buttons
** More information, schematic, and tutorial visit: http://www.addohms.com/ep15
**
** Public Domain Code by James Lewis, @baldengineer
*/

const int buttonPin = P1_6;
const int ledPin = P6_0;

bool buttonState = 0;

void setup()
{
  pinMode(ledPin, OUTPUT);

  // added for debug, this will only work on Energia!
  pinMode(GREEN_LED, OUTPUT);

  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop()
{
  // this code does not do any de-bounce
  buttonState = digitalRead(buttonPin);

  if (buttonState) {
    digitalWrite(ledPin, HIGH);
    // Again, Energia only
    digitalWrite(GREEN_LED, HIGH);
    Serial.println("High");
  } else {
    digitalWrite(ledPin, LOW);
    // Again, Energia only
    digitalWrite(GREEN_LED, LOW);
    Serial.println("Low");
  }
  delay(100); // reduces the serial.prints to something reasonable.
}