//
// Infrared (PIR) motion detector demonstration
//
// We use the HC-SR501 motion sensor.
// It runs on 5 volts, so we steal the power from TP1 on the Launchpad, and use a 1,000 ohm resistor to
// bring the output pulse down to a level the Launchpad can handle.
//
// The sensor has three pins, power, output, and ground. The output is connects (via the 1,000 ohm resistor)
// to Port 1 pin 4.
//

enum { USE_SERIAL=false };

void
setup( void )
{
  if( USE_SERIAL )
    Serial.begin( 9600 );
  pinMode( P1_4, INPUT );
  pinMode( GREEN_LED, OUTPUT );
}

void
loop( void )
{
  if( digitalRead( P1_4 ) == HIGH )
  {
    if( USE_SERIAL)
      Serial.println( "Motion detected!" );
    digitalWrite( GREEN_LED, HIGH );
  }
  else
  {
    if( USE_SERIAL )
      Serial.println( "All quiet..." );
    digitalWrite( GREEN_LED, LOW );
  }
  delay( 10 );
}