Freeze!

Description

Use the Arduino to control a light emitting diode and make it blink.

Components Used

Light Emitting Diode (LED)--blue, red
Resistors
Piezo
FSR

Arduino Code

/* I said "Freeze!"
 * I added a FSR into Paddington so that when he raises his arm to
 * in hot pursuit of a thief, it will emit a whistle (like the
   British bobbies */
 
int speakerPin = 7;
int ledPin1 = 13;  // blue LED
int ledPin2 = 12;  // red LED
int fsrPin = 0;

int fsrVal=0;  //store value read from FSR
int tone = 956; //The "whistle" is in C

void setup()
{
  pinMode(ledPin1, OUTPUT);      // sets the digital pin as output for blue LED
  pinMode(ledPin2, OUTPUT);      // sets the digital pin as output for blue LED
  pinMode(speakerPin, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  //load the value from the FSR
  fsrVal = analogRead(fsrPin);  // read the value from the FSR; 0 = arm up; > 0 = arm down
  Serial.print("fsrVal ");      // debug--what's the FSR reading?
  Serial.print(fsrVal);
 
  if (fsrVal > 0) 
{
  // if Paddington's arm is down, he's not in pursuit
  digitalWrite(ledPin1, HIGH);   // sets the blue LED on
  digitalWrite(ledPin2,LOW);    //sets the red LED off
  delay(1000);                  // waits for a second
}
else
{
 // if Paddington's in hot pursuit and waving his arm menacingly
 // have the LED blink violently as if he's trying to pull-over a car
   inPursuit();
   }
}

//beep once and blink the LED
void inPursuit()
{
  digitalWrite(ledPin1, LOW);  // sets the blue LED on
  digitalWrite(ledPin2, HIGH);  //sets the red LED off
    delay(100);                 // make the red light blink rapidly
  for( int i=0; i<50; i++ )
  {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);
  }
  digitalWrite(ledPin2, LOW);  //sets the red LED off
}

Paddington on Patrol (blue LED on)

Freeze! (Paddington in hot pursuit of fleeing suspect--red LED on and beep)