Networking and Communication was the most difficult week for me to understand and also it was important to get the concept well for my final project. The toy has five wings and a central star body which acts as the chief communicator

 

Had to count the number of pins required to select the microprocessor and found that I need the following for the design

 

Wing Electronics

RGB LED   -  3 pins

Communication   - 2 pins

Reset, Vcc and Ground will be others required

Since 5 pins were required I selected Attiny45 for the project

 

Central Star Body

Communication   -  2 pins

Reset, Vcc, Ground will be connected like always

So Attiny45 works for this module of the project

 

The method of designing will be the same:

1. Design the board with the required components

2. Milling the board

2. Soldering the components

3. Programming of the board through Arduino

 

I wanted to shape this as per the toy I designed, I kept trying to draw  the shape using tools in Eagle but failed to generate accurate dimensions for the same

Then I found that a .dxf  imported to shape and had plenty of complications in routing the design

Required hardware for this assignment:

 

2 LEDs, each with 200 ohm resistance

2 x 42 Kohm for the I2C BUS (You need them as a pull-up resistor),

A Breadboard with some wires,

The FABISP (check out Week 4 - electronics production),

At least 2 Fabkits V.2, in my example 3 Fabkits V.2,

a FTDI cable,

For central board

// Wire Master LED Writer

 

// Writes data to an I2C slave device

 

#include <Wire.h>

 

void setup() {

  Wire.begin(); // join i2c bus (address optional for master)

}

 

void loop() {

  Wire.beginTransmission(5); // transmit to device #5

  Wire.write(1);              // sends one byte

  Wire.endTransmission();    // stop transmitting

 

  Wire.beginTransmission(7); // transmit to device #7

  Wire.write(0);              // sends one byte

  Wire.endTransmission();    // stop transmitting

 

  delay(500);

 

   Wire.beginTransmission(5); // transmit to device #5

  Wire.write(0);              // sends one byte

  Wire.endTransmission();    // stop transmitting

 

  Wire.beginTransmission(7); // transmit to device #7

  Wire.write(1);              // sends one byte

  Wire.endTransmission();    // stop transmitting

 

  delay(500);

}

 

 

 

For the wings

 Wire Slave LED Receiver

 

#include <Wire.h>

 

void setup() {

  pinMode(A3, OUTPUT);

  Wire.begin(5);                // join i2c bus with address #5

  Wire.onReceive(receiveEvent); // register event

}

 

void loop() {

  delay(100);

}

 

// function that executes whenever data is received from master

// this function is registered as an event, see setup()

void receiveEvent(int howMany) {

 

  int x = Wire.read();    // receive byte as an integer

  if (x == 0)

    digitalWrite(A3, HIGH);

  else

    digitalWrite(A3, LOW);

}

 

 

 

// Wire Slave LED Receiver

 

#include <Wire.h>

 

void setup() {

  pinMode(A3, OUTPUT);

  Wire.begin(7);                // join i2c bus with address #7

  Wire.onReceive(receiveEvent); // register event

}

 

void loop() {

  delay(100);

}

 

// function that executes whenever data is received from master

// this function is registered as an event, see setup()

void receiveEvent(int howMany) {

 

  int x = Wire.read();    // receive byte as an integer

  if (x == 0)

    digitalWrite(A3, HIGH);

  else

    digitalWrite(A3, LOW);

}

 

References

 

I would like to refer to page Arduino.cc and www.hlembke.de which has helped me very much to get the necessary information.