November 24, 2007
Reading for November 27th, are now posted. Enjoy!

October 2, 2007
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May 24, 2008
This site has been archived and is no longer editable. Stay tuned for the next version, coming in the fall!

Entertaining Pen

Project Members: 
Srinivasan Ramaswamy


A ball pen which will light up and play when its lead is switched on or off, to make the interaction more interactive. It could be extended to the idea of playing the music and light when the pen is ready to write and switch them off when its not ready.

Components Used

Arduino board


1 10K ohm resistor


1 220ohm resistor

1 piezo speaker

1 Ball Pen


Arduino Code

/* Entertaining pen
* --------
* Created 24 October 2006
* copyleft 2006 Tod E. Kurt <
Modified by Srinivasan Ramaswamy

int potPin = 0; // select the input pin for the potentiometer
int speakerPin = 7;
int ledPin = 11;
int val = 0;
int PrevVal = 0;

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

void loop() {
digitalWrite(speakerPin, LOW);

val = analogRead(potPin); // read value from the sensor
val = val*2; // process the value a little
//val = val/2; // process the value a little

for( int i=0; i<500; i++ ) { // play it for 50 cycles
digitalWrite(speakerPin, HIGH);
digitalWrite(speakerPin, LOW);
if (val!=PrevVal){
PrevVal = val;



 Entertaining PenEntertaining Pen

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