Vibrating Cup

For this lab I decided to use the vibrating practicality of a motor by attaching a cork slice off center.  I then attached the vibrating motor to a cup where if left by itself for too long it would start to vibrate to remind you (see attached video).
The motivation for this is a reminder to drink a beverage.  Some uses of this could be making sure you drink the cup of water you poured yourself to get your 8 glasses per day or to finish your coffee/tea before it gets cold.  By picking up the cup the user exposes the photosensor to the ambient light and this resets the counter.  I utilized a photosensor for this prototype instead of an FSR because the force would change as you drink your beverage.  Future work would include an FSR to turn off the alarm when the cup is empty.  Another added functionality would be to increase the vibration the more alarm periods that are missed.
https://docs.google.com/file/d/0BzquLLPdhTEkdFlxUm4yQjAxQzA/edit?usp=sha...
Materials used

1- Arduino Uno Microcontroller
1- Breadboard
1- 1KΩ Resistor
1- 10KΩ Resistor
1- USB Cable
1- Laptop Computer 
1 - DC Motor
1 - 1N4004 Diode
1 - TIP120 Transistor
1 - Battery pack with 2 AA batteries
1 - Photosensor

1 - Cup

1 - Tape
 
Code

/*

 * one pot fades one motor

 * modified version of AnalogInput

 * by DojoDave <http://www.0j0.org>

 * http://www.arduino.cc/en/Tutorial/AnalogInput 

 * Modified again by dave

 */

int senPin = 0;   // select the input pin for the sensor

int motorPin = 9; // select the pin for the Motor

int motorval = 0;      // variable to store the value coming from the sensor

int senval = 0;

int count = 0;     //counts how many times senval is below limit

int timelim = 5;  //count the amount of time cup is down in seconds

int limit = 150;   //sensor value to determine if cup is up or down

int vib = 2;      //how many vibrations per warning

void setup() {

  Serial.begin(9600);

  pinMode(senPin, OUTPUT);  

}

void loop() {

  delay(1000);   //read values every second

  senval = analogRead(senPin);  //read in sensor value

  Serial.println(senval); //debugging

  if(senval<limit)

  {

    count++;

  }

    if(senval>limit)

  {

    count=0;

  }

  if(count>=timelim) 

{

  for(int i=0; i <= vib; i++){

  analogWrite(motorPin, 100);

  delay(200);

  analogWrite(motorPin, 0);

  delay(200);

}

count = 0;

 }

}