Introduction to Physical Computing - Fall 2009

// The following example code will blink an LED attached on pin 2

int ledPin = 2;  // the led is connected on pin 2

void setup()
{
  // set up the ledPin as an output
  pinMode(ledPin,OUTPUT);
}

void loop()
{
  digitalWrite(ledPin,HIGH);  // turn the LED on
  delay(1000);                // pause for 1 second (1000 ms)
  digitalWrite(ledPin,LOW);   // turn the LED off
  delay(1000);                // pause for 1 second (1000 ms)

  // rinse and repeat
}

// The following example code will turn an LED on and off based on
// the activity of a button switch

int ledPin = 2;      // an LED will be attached on pin 2
int switchPin = 3;   // a switch will be attached on pin 3
int switchState = 0; // a temporary variable for storing the switch state

void setup()
{
  pinMode(ledPin,OUTPUT);    // set up the LED pin as an output
  pinMode(switchPin,INPUT);  // set up the switch pin as an input
}

void loop()
{
  // read in the current state of the switch
  switchState = digitalRead(switchPin);

  if(switchState == HIGH)       // if the switch is pressed...
  {
    digitalWrite(ledPin,HIGH);  // turn the LED on
  }
  else                          // if the switch is NOT pressed...
  {
    digitalWrite(ledPin,LOW);   // turn the LED off
  }

  // rinse and repeat
}

// The following example code will read in the analog voltage from
// a potentiometer and print the values (0 - 1023) to your serial monitor

int potPin = 0;        // the potentiometer is connected on analog pin 0
int analogValue = 0;   // a variable to store the analog values

void setup()
{
  Serial.begin(9600);  // configures serial communication at 9600 bps (bits per second)
}

void loop()
{
  analogValue = analogRead(potPin);  // reads in the analog voltage and saves it to a variable
  Serial.println(analogValue);       // prints the analog value from the Arduino to your computer's serial monitor
  delay(10);                         // pause 10 milliseconds, this will keep your Arduino from slamming your computer with messages
}

// The following example code will read in the analog voltage from
// a potentiometer and send it out to an LED on an analog out pin.
// The effect is that the LED will change brightness as your turn
// the knob of the potentiometer.

int potPin = 0;    // the potentiometer is connected on analog pin 0
int ledPin = 3;    // the LED is connected on digital PWM pin 3
int potValue = 0;  // a variable to store the analog value of the pot

void setup()
{
  Serial.begin(9600);        // configures serial communication at 9600 bps (bits per second)
  pinMode(ledPin, OUTPUT);   // set the LED pin as an output
}

void loop()
{
  potValue = analogRead(potPin);      // reads in the analog voltage and saves it to a variable

  Serial.println(potValue);           // prints the analog value from the Arduino to your computer's serial monitor

  analogWrite(ledPin, potValue / 4);  // sends out an analog voltage related to the analog input voltage from the pot
                                      // The analog input range is 0 - 1023 and the analog output range is 0 - 255 so you must divide by 4 for scaling  
  delay(10);                          // pause 10 milliseconds, this will keep your Arduino from slamming your computer with messages
}

// The following example code will read in an analog reading from a potentiometer
// and use the reading to control the timing in which a small 8-ohm speaker is pulsed

int potPin = 0;        // the potentiometer is connected to analog pin 0
int speakerPin = 2;    // the speaker is connected to digital pin 2

int analogValue = 0;

void setup()
{
  pinMode(speakerPin,OUTPUT);  // define the speaker pin as an output, obviously
}

void loop()
{
  analogValue = analogRead(potPin);   // read an analog value fro the potentiometer
  analogValue = map(analogValue, 0, 1023, 1912, 3830);  // map the analog input range 0 - 1023 to the range that defines the frequency timing for an octave of notes

  digitalWrite(speakerPin,HIGH);  // turn the speaker pin on
  delayMicroseconds(analogValue); // delay for a certain amount of microseconds
  digitalWrite(speakerPin,LOW);   // turn the speaker pin off
  delayMicroseconds(analogValue); // delay for the same amount of microseconds

  // funny enough, turning the speaker pin on and off very quickly at a certain rate will cause the speaker to generate a tone
}

void setup()
{
}

void loop()
{
  delay(1);
}