Nursery Rhyme Hat using arduino




I created the Nursery Rhyme Hat for a class on youth and technology.  I’m new to instructables and e-textiles, so please bear with me!
This is the first time I have used the Lilypad Arduino or any kind of soft circuit technology, so my coding is borrowed from several others (more on my code in Step 2).
All in all, it was quite the learning experience creating this hat and I’m excited to share it with you!
Nursery Rhyme Hat using arduino




Step 1: Gather Materials

Materials Needed:
-Lilypad Arduino Development Board
https://www.sparkfun.com/products/11262
-Lilypad Simple Board, 1 White LED, RGB tricolor LED, Light Sensor, Buzzer, FTDI, Conductive Thread, Needles, LiPo Battery
-USB cable
-Fedora
-Silk flower rosette
-Small rectangle of green felt (~2x.5in)
-Large rectangle of lining fabric (~5x4in)
-2 Sets of hook-and-eyes, plus one extra hook
-All purpose thread
-Clear nail polish
-Needlenose pliers

Step 2: Create a Plan

I started with an idea for a hat that you could wear during a storytime with young children.  When exposed to light (lifting the flower’s felt leaf) the hat would light up and play a nursery rhyme tune as a fun prop for storytime.  I used or learned from code from Leah Buechley’s Sound example, Casey’s Light Sensor code for her Night and Day Toy, Alyson’s Dark-Be-Gone code and Leah Buechley’s Tricolor LED code.  I ended up with a code that made my hat light up and play Mary Had a Little Lamb (See Below).

Plug your FTDI and battery into the main board and coonect it to your computer with your USB cable.  Upload your code.

/*
Nursery Rhyme Hat
Liz Huessy
March 2014
*/
int ledPin =
int ledPin = A3;  // The white LED pin is connected to pin A3
int redPin = 10;  // The red LED pin is connected to pin 10
int bluePin = 9;  // The blue LED pin is connected to pin 9
int greenPin = 6;// The green LED pin is connected to pin 6
int ground = 11; // Pin 11 is the ground pin
int speakerPin = A2;     // The speaker is connected to digital pin A2
int sensorPin = A4;     // The light sensor is connected to pin A4
int sensorValue;     // Variable to store the value coming from the sensor

void setup()
{

pinMode(speakerPin, OUTPUT);     // Sets this pin to be an output
pinMode(A3, OUTPUT);  // Sets this pin to be an output
pinMode(10, OUTPUT);  // Sets this pin to be an output
pinMode(9, OUTPUT);  // Sets this pin to be an output
pinMode(6, OUTPUT);   // Sets this pin to be an output
pinMode(sensorPin, INPUT); //
pinMode(ground, OUTPUT);
digitalWrite(ground, LOW);  // Turns off power to pin 11 (ground)

}

void loop()     // Runs on a loop
{

sensorValue = analogRead(sensorPin);     // Read the value from the sensor
delay(100);     // Delay for 1/10 of a second

if (sensorValue < 20)// If it is dark, turn all LEDs off
{
digitalWrite(6, LOW);
delay(750);
digitalWrite(9, LOW);
delay(500);
digitalWrite(10, LOW);
delay(500);
digitalWrite(A3, LOW);
delay(500);
}
else {  //If it is not dark, turn green and blue LEDs on and play the tune, then turn on red and white LEDs
digitalWrite(6, HIGH);
delay(500);
digitalWrite(9, HIGH);
delay(500);
scale();     // Call the scale() function
delay(1000);     // Delay for 1 second
digitalWrite(10, HIGH);
delay(500);
digitalWrite(A3, HIGH);
delay(500);

}
}
void beep (unsigned char speakerPin, int frequencyInHertz, long timeInMilliseconds)     // the sound producing function
{
int x;
long delayAmount = (long)(1000000/frequencyInHertz);
long loopTime = (long)((timeInMilliseconds*1000)/(delayAmount*2));
for (x=0;x<loopTime;x++)
{
digitalWrite(speakerPin,HIGH);
delayMicroseconds(delayAmount);
digitalWrite(speakerPin,LOW);
delayMicroseconds(delayAmount);
}
}

void scale ()//Play Mary Had a Little Lamb
{
beep(speakerPin,2637,500);  //E
beep(speakerPin,2349,500);  //D
beep(speakerPin,4186,500);  //C
beep(speakerPin,2349,500);  //D
beep(speakerPin,2637,500);  //E
beep(speakerPin,2637,500); //E
beep(speakerPin,2637,1000); //E

beep(speakerPin,2349,500);  //D
beep(speakerPin,2349,500);  //D
beep(speakerPin,2349,500);  //D
beep(speakerPin,2637,500);  //E
beep(speakerPin,2637,500);  //E
beep(speakerPin,2637,1000);  //E

beep(speakerPin,2637,500);  //E
beep(speakerPin,2349,500);  //D
beep(speakerPin,4186,500);  //C
beep(speakerPin,2349,500);  //D
beep(speakerPin,2637,500);  //E
beep(speakerPin,2637,500); //E
beep(speakerPin,2637,1000); //E

beep(speakerPin,2637,500);  //E
beep(speakerPin,2349,500);  //D
beep(speakerPin,2349,500);  //D
beep(speakerPin,2637,500);  //E
beep(speakerPin,2349,500);  //D
beep(speakerPin,4186,1000);  //C
beep(speakerPin,4186,1000);  //C
}

Once I had written my code, the next thing I did was to create a diagram of my e-textile, showing the exact connections and layout of my circuit, making sure that no negative and positive lines crosssed and that each LED, Buzzer and Sensor was properly connected.
It is very important to complete this step before taking apart the Lilypad pieces!

Step 3: Sew Electronics

Now you are ready to carefully break apart the Lilypad pieces.  I used a pair of needle nose pliers, but I’m sure tweezers could also work.
With the conductive thread, you now begin to sew on the LEDs, Buzzer, Light Sensor and Main Lilypad Board, using the diagram from the previous step.
Each sewn connection should begin and end with sewing the conductive thread through the pin multiple times to ensure a good connection.




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