## December 23, 2009

### Beating Heart - Alec Rippberger

This piece of artwork blinks as if it were alive and beating! The closer you approach the faster the heart "beats". I used several LEDs attached to 1k resistors embedded in the semi transparent sculpture of a "heart". These LEDs ran into the digital pins of the arduino and were controlled by the following code:

/* Ping))) Sensor

This sketch reads a PING))) ultrasonic rangefinder and returns the
distance to the closest object in range. To do this, it sends a pulse
to the sensor to initiate a reading, then listens for a pulse
to return. The length of the returning pulse is proportional to
the distance of the object from the sensor.

The circuit:
* +V connection of the PING))) attached to +5V
* GND connection of the PING))) attached to ground
* SIG connection of the PING))) attached to digital pin 7
http://www.arduino.cc/en/Tutorial/Ping

created 3 Nov 2008
by David A. Mellis
modified 30 Jun 2009
by Tom Igoe
*/
// this constant won't change. It's the pin number
// of the sensor's output:
const int pingPin = 7;
//variables for digital pins one through five used as LEDs
int pinSix = 6;
int pinTwo = 2;
int pinThree = 3;
int pinFour = 4;
int pinFive = 5;

void setup() {
// initialize serial communication
Serial.begin(9600);
// set pinmode for LEDs
pinMode(pinSix, OUTPUT);
pinMode(pinTwo, OUTPUT);
pinMode(pinThree, OUTPUT);
pinMode(pinFour, OUTPUT);
pinMode(pinFive, OUTPUT);

}
void loop()
{
int beat = 1000;
int unbeat = 2000;
int rest = 3000;
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);
// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(pingPin, INPUT);
duration = pulseIn(pingPin, HIGH);
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();

beat = inches * 6;
unbeat = inches * 5.5;
rest = inches * 18;

digitalWrite(pinSix, HIGH);
digitalWrite(pinTwo, HIGH);
digitalWrite(pinThree, HIGH);
digitalWrite(pinFour, HIGH);
digitalWrite(pinFive, HIGH);
delay(beat);
digitalWrite(pinSix, LOW);
digitalWrite(pinTwo, LOW);
digitalWrite(pinThree, LOW);
digitalWrite(pinFour, LOW);
digitalWrite(pinFive, LOW);
delay(beat);
digitalWrite(pinSix, HIGH);
digitalWrite(pinTwo, HIGH);
digitalWrite(pinThree, HIGH);
digitalWrite(pinFour, HIGH);
digitalWrite(pinFive, HIGH);
delay(unbeat);
digitalWrite(pinSix, LOW);
digitalWrite(pinTwo, LOW);
digitalWrite(pinThree, LOW);
digitalWrite(pinFour, LOW);
digitalWrite(pinFive, LOW);
delay(rest);
}

long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
}

### Beating Heart - Alec Rippberger

This piece of artwork blinks as if it were alive and beating! The closer you approach the faster the heart "beats". I used several LEDs attached to 1k resistors embedded in the semi transparent sculpture of a "heart". These LEDs ran into the digital pins of the arduino and were controlled by the following code:

/* Ping))) Sensor

This sketch reads a PING))) ultrasonic rangefinder and returns the
distance to the closest object in range. To do this, it sends a pulse
to the sensor to initiate a reading, then listens for a pulse
to return. The length of the returning pulse is proportional to
the distance of the object from the sensor.

The circuit:
* +V connection of the PING))) attached to +5V
* GND connection of the PING))) attached to ground
* SIG connection of the PING))) attached to digital pin 7
http://www.arduino.cc/en/Tutorial/Ping

created 3 Nov 2008
by David A. Mellis
modified 30 Jun 2009
by Tom Igoe
*/
// this constant won't change. It's the pin number
// of the sensor's output:
const int pingPin = 7;
//variables for digital pins one through five used as LEDs
int pinSix = 6;
int pinTwo = 2;
int pinThree = 3;
int pinFour = 4;
int pinFive = 5;

void setup() {
// initialize serial communication
Serial.begin(9600);
// set pinmode for LEDs
pinMode(pinSix, OUTPUT);
pinMode(pinTwo, OUTPUT);
pinMode(pinThree, OUTPUT);
pinMode(pinFour, OUTPUT);
pinMode(pinFive, OUTPUT);

}
void loop()
{
int beat = 1000;
int unbeat = 2000;
int rest = 3000;
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);
// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(pingPin, INPUT);
duration = pulseIn(pingPin, HIGH);
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();

beat = inches * 6;
unbeat = inches * 5.5;
rest = inches * 18;

digitalWrite(pinSix, HIGH);
digitalWrite(pinTwo, HIGH);
digitalWrite(pinThree, HIGH);
digitalWrite(pinFour, HIGH);
digitalWrite(pinFive, HIGH);
delay(beat);
digitalWrite(pinSix, LOW);
digitalWrite(pinTwo, LOW);
digitalWrite(pinThree, LOW);
digitalWrite(pinFour, LOW);
digitalWrite(pinFive, LOW);
delay(beat);
digitalWrite(pinSix, HIGH);
digitalWrite(pinTwo, HIGH);
digitalWrite(pinThree, HIGH);
digitalWrite(pinFour, HIGH);
digitalWrite(pinFive, HIGH);
delay(unbeat);
digitalWrite(pinSix, LOW);
digitalWrite(pinTwo, LOW);
digitalWrite(pinThree, LOW);
digitalWrite(pinFour, LOW);
digitalWrite(pinFive, LOW);
delay(rest);
}

long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
}

## December 22, 2009

### Interactive Wall

This project uses capacitive sensors to communicate with Processing via the Arduino. I am currently in the process of re-writing the code to work out bugs and such. The wall will be on display in the Rapson Hall courtyard over break and during the first week of the Sping 2010 semester.

Justin Berken