Assignment: DC Motor: Actuation Assignment 1
Collaborators:
Description
I created a mobile (very loosely based on this mobile) that spins when the motor is on. The mobile is meant to be used over a baby's crib. When the lights are turned out, the mobile spins and Twinkle, Twinkle Little Star plays. I used a photocell to recognize when the lights are turned off and a Piezo speaker to play the melody.
Components Used
- 220 ohm resistor
- 10k resistor
- 1k resistor
- Arduino board
- Bread board
- Wires
- Photocell
- Piezo speaker
- DC motor
- battery pack
- 1 diode
- 1 transistor
- colored paper
- craft wire
- string
- cardboard
- tape
- screw eye
- cork
Arduino Code
/*
* Baby Mobile
*
* When lights are turned off, motor causes mobile to spin
* and play Twinkle, Twinkle, Little Star.
*
* sound code modified from http://courses.ischool.berkeley.edu/i262/f09/sites/default/files/play_me...
*/
int lightSensor = 0; // photocell is connected to analog pin 0
int motorPin = 9; // select the pin for the Motor
int val = 0; // variable to store the value coming from the photocell
int speakerOut = 7;
byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};
int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};
byte melody[] = "4c2p4c2p4g2p4g2p4a2p4a2p8g4p4f2p4f2p4e2p4e2p4d2p4d2p8c4p4g2p4g2p4f2p4f2p4e2p4e2p8d4p4g2p4g2p4f2p4f2p4e2p4e2p8d2p4c2p4c2p4g2p4g2p4a2p4a2p8g4p4f2p4f2p4e2p4e2p4d2p4d2p8c4p";
// 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 ledPin = 13;
int count = 0;
int count2 = 0;
int count3 = 0;
int MAX_COUNT = 96; //melody count
int statePin = LOW;
void setup() {
pinMode(speakerOut, OUTPUT);
Serial.begin(9600);
}
void loop() {
val = analogRead(lightSensor); // read the value from the photocell
Serial.println(val);
if (val < 800) { //if light is turned off
analogWrite(motorPin, 100); // start motor
digitalWrite(speakerOut, LOW); //play music
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);
delayMicroseconds(500);
}
}
}
}
}
}
Photos
Board set up
Mobile
Video
(The video was shot without the mobile starting by turning off the light. Turning off the light is bad for shooting video...)
