Theory and Practice of Tangible User Interfaces

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Happy Halloween! Ghost

Thu, 10/11/2007 - 01:40 — Aylin Selcukoglu

Assignment:

Lab 6 - Output: DC motors

Project Members:

Aylin Selcukoglu

Description

With Halloween coming up at the end of the month, I thought I would do a little festive October project. I explored motion as an output focusing on the vibration caused by the DC motor with a cork eccentric weight attached to it. The goal was to make one of those spooky door decorations so if someone came to my front door and stepped on the mat on the ground in front the FSR would read in this pressure and then in response the ghost would glow red and move about as a spooky tune played in the background. The only problem was that the FSR I soldered to longer wires broke already, so I had to use my FSR that was connected directly to the breadboard, unfortunately.

Components Used

red LED (Light Emitting Diode)
20-ohm resistor (red, red, brown, gold)
1k resistor
DC motor
diode
transistor
FSR
piezo speaker

Arduino Code

* Happy Halloween! Ghost

int potPin = 1; // select the input pin for the potentiometer

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

int redPin = 10; // select the pin for the red LED

int speakerOut = 7; // select the pin for the piezo speaker

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

byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};

int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};

//byte melody[] = "2d2a1f2c2d2a2d2c2f2d2a2c2d2a1f2c2d2a2a2g2p8p8p8p";

// thanks to John Ward for helping me come up with the spooky melody.

// I attempted to use the E minor triad followed by the D minor triad (minus the a)

// so e g b d f

//byte melody[] = "4e4g4b3e3g3b2e2g2b1e1g1b2p8p8p8p4d4f4a3d3f3a2d2f2a1d1f1a2p8p8p8p";

//byte melody[] = "4e4g4e4g4e4g4e4g4e4g4e4g4d4f4d4f4d4f4d4f4d4f4d4f4d4f4d4f2p";

//byte melody[] = "4e4g4b4e4g4b4d4f4d4f4e4g4b4e4g4b4d4f4d4f4e4g4b4e4g4b4d4f4d4f2p";

//byte melody[] = "4e4g4e4g4e4g4e4g4d4f4d4f4d4f4d4f4d4f4d4f4d4f4d4f2p";

byte melody[] = "4e4g4b4e4g4b8d8f4e4g4b4e4g4b8d8f4e4g4b4e4g4b8d8f2p";

// count length: 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0

// 10 20 30

int count = 0;

int count2 = 0;

int count3 = 0;

int MAX_COUNT = 24;

int statePin = LOW;

void setup() {

pinMode(redPin, OUTPUT); // sets the pin as output

pinMode(speakerOut, OUTPUT); // sets the pin as output

Serial.begin(9600);

analogWrite(redPin, 0);

}

void loop() {

val = analogRead(potPin); // read the value from the sensor, between 0 - 1024

Serial.println(val);

//if the FSR detects pressure then that means

// someone is stepping on the mat

if(val > 50) {

// send full power to the motor to make the ghost move

analogWrite(motorPin, 255); // analogWrite can be between 0-255

analogWrite(redPin, 255);

digitalWrite(speakerOut, LOW);

for (count = 0; count < MAX_COUNT; count++) {

statePin = !statePin;

//digitalWrite(ledPin, statePin);

for (count3 = 0; count3 <= (melody[count*2] - 48) * 30; count3++) {

for (count2=0;count2<8;count2++) {

if (names[count2] == melody[count*2 + 1]) {

digitalWrite(speakerOut,HIGH);

delayMicroseconds(tones[count2]);

digitalWrite(speakerOut, LOW);

delayMicroseconds(tones[count2]);

}

if (melody[count*2 + 1] == 'p') {

// make a pause of a certain size

digitalWrite(speakerOut, 0);

}

// no one is on the mat

else

analogWrite(redPin, 0);

analogWrite(motorPin, 0);

//digitalWrite(speakerOut, 0);

}

Item

breadboard

ghost setup

video:

Comments

Mon, 10/22/2007 - 23:35 — Ryan Aipperspach

Comments from TAs

Very nice project! You brought together a lot of different components from different labs and also worked in the physical form of your project. It's too bad that the FSR under the floor mat didn't work out! If you bring your project to the Halloween party on Tuesday, we could work on hooking it up.