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Published July 22, 2016 © GPL3+

Personal Home Assistant

It is the I2C protocol based Home Automation System. Which can be controlled by voice, Android Phone and even from your laptop.

AdvancedFull instructions providedOver 2 days8,636

Things used in this project

Hardware components

Arduino UNO

Microchip ATMega328

Linear Regulator (7805)

Jumper wires (generic)

Resistor 10k ohm

Resistor 1k ohm

Capacitor 22 pF

16 MHz Crystal

SparkFun Pushbutton switch 12mm

LED (generic)

Capacitor 10 µF

Capacitor 470 µF

Terminal Blocks

9V to Barrel Jack Connector

SparkFun DC Female Jack

Raspberry Pi 2 Model B

Relay (generic)

Software apps and online services

Arduino IDE

webiopi

Microsoft Visual Studio 2015

Microsoft Windows Speech Recognition Macros

Hand tools and fabrication machines

Soldering iron (generic)

PCB Milling Machine

Story

I am very keen about science and technology. So, I wanted to apply engineering in reality that how can technology help us. At that time, I was in the last year of my curriculum, I visited Ahmedabad Blind People Association. And I had seen lot's of handicap people together. Immediately, I planned a design in my mind that it is feasible to build a device for them. With the help of that device they will become independent and no need to become dependent on others for daily work.

1. Demo

1 / 12 • PCB Milling Machine Front View ( At FabLab, Ahmedabad)

2. Sources from we got help

https://www.techprobex.com/2013/06/turn-your-computer-into-jarvis-from.html/

www.arduino.cc

www.raspberrypi.org

https://msdn.microsoft.com

https://blogs.msdn.microsoft.com/speech/

The 8051 Microcontroller and Embedded Systems: Using Assembly and CBook by Janice Gillispie Mazidi, Muhammad Ali Mazidi, and Rolin D. McKinlay

The AVR Microcontroller and Embedded Systems: Using Assembly and CBook by Muhammad Ali Mazidi, Sarmad Naimi, and Sepher Naimi

3. Working

There are two parts of this work.

>>> Home Automation Based On Voice

>>>IoT enabled by Raspberry Pi

Home Automation Based On Voice

In this part, We are using I2C protocol.

For using this protocol we need masters and slaves. So, here, we used Arduino UNO and Raspberry Pi as master. And we made three slaves based on ATmega328 IC. The slave's schematics is available in below section. Where readily available PCB board is also in that section. That was made by me.

we are also using 8 channel relay module.

where we are using 3 relays for Hall, 3 relays for bed room and 2 relays for kitchen.

Three relays of hall with 1st slave on digital pin number 2, 3 and 4. And other 3 relays of bedroom is connected with 2nd slave and other 2 relays of kitchen is connected with 3rd slave. So, we will get structure like below.

Structure Of Hardware

Now, Our Arduino UNO is connected with PC. Form where you have to upload the master code Which is given in code section. Then for slave 1, slave 2 and slave 3, you have to upload slave program. Here, each component is connected with I2C protocol. Means Slaves and Masters are connected with SDA and SCL line.

Code

int state;
#include <Wire.h>
#include <Password.h> 
#include <Keypad.h>

Password password = Password( "1234" );

const byte ROWS = 4; // Four rows
const byte COLS = 4; // columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = { 2, 3, 4, 5 };// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
byte colPins[COLS] = { 6, 7, 8, 9 };


// Create the Keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );


void setup() {
 Serial.begin(9600);
 delay(200);
 pinMode(13, OUTPUT);  
 keypad.addEventListener(keypadEvent);
 Wire.begin(); // join i2c bus (address optional for master)
}


void loop() 
{

keypad.getKey();
state = Serial.read();
switch(state)
{
  
  // Drawing room controlling, device id 1
  
  case '1':                   //Drawing Room Fan On
  Wire.beginTransmission(1);
  Wire.write("1");
  Wire.endTransmission();
  delay(500);
  break;

  case '2':                  //Drawing room Light on
  Wire.beginTransmission(1);
  Wire.write("2");
  Wire.endTransmission();
  delay(500);
  break;

  case '3':                  //Drawing room Curtain open
  Wire.beginTransmission(1);
  Wire.write("3");
  Wire.endTransmission();
  delay(500);
  break;
  
  case '4':                  //Drawing room Fan off
  Wire.beginTransmission(1);
  Wire.write("4");
  Wire.endTransmission();
  delay(500);
  break;

  case '5':                  // Drwaing room light off
  Wire.beginTransmission(1);
  Wire.write("5");
  Wire.endTransmission();
  delay(500);
  break;

  case '6':                  //Drawing room curtain off
  Wire.beginTransmission(1);
  Wire.write("6");
  Wire.endTransmission();
  delay(500);
  break;

  // Bed room controlling , device id 2
  
  case '7':                   //Bed Room Fan On
  Wire.beginTransmission(2);
  Wire.write("1");
  Wire.endTransmission();
  delay(500);
  break;

  case '8':                  //Bed room Light on
  Wire.beginTransmission(2);
  Wire.write("2");
  Wire.endTransmission();
  delay(500);
  break;

  case '9':                  //Bed room Curtain open
  Wire.beginTransmission(2);
  Wire.write("3");
  Wire.endTransmission();
  delay(500);
  break;
  
  case 'A':                  //Bed room Fan off
  Wire.beginTransmission(2);
  Wire.write("4");
  Wire.endTransmission();
  delay(500);
  break;

  case 'B':                  // Bed room light off
  Wire.beginTransmission(2);
  Wire.write("5");
  Wire.endTransmission();
  delay(500);
  break;

  case 'C':                  //Bed room curtain off
  Wire.beginTransmission(2);
  Wire.write("6");
  Wire.endTransmission();
  delay(500);
  break;


  // Kitchen controlling
  
  case 'D':                   //Kitchen Fan On
  Wire.beginTransmission(3);
  Wire.write("1");
  Wire.endTransmission();
  delay(500);
  break;

  case 'E':                  //KitchenLight on
  Wire.beginTransmission(3);
  Wire.write("2");
  Wire.endTransmission();
  delay(500);
  break;

  case 'F':                  //Kitchen Curtain open
  Wire.beginTransmission(3);
  Wire.write("3");
  Wire.endTransmission();
  delay(500);
  break;
  
  case 'G':                  //Kitchen Fan off
  Wire.beginTransmission(3);
  Wire.write("4");
  Wire.endTransmission();
  delay(500);
  break;

  case 'H':                  // Kitchen light off
  Wire.beginTransmission(3);
  Wire.write("5");
  Wire.endTransmission();
  delay(500);
  break;

  case 'I':                  //Kitchen curtain off
  Wire.beginTransmission(3);
  Wire.write("6");
  Wire.endTransmission();
  delay(500);
  break;

  
}
}

void keypadEvent(KeypadEvent eKey){
  switch (keypad.getState()){
  case PRESSED:
  
  Serial.print("Enter:");
  Serial.println(eKey);
  delay(10);
  
 
  
  switch (eKey){
    case '*': checkPassword(); delay(1); break;
    
    case '#': password.reset(); delay(1); break;
    
     default: password.append(eKey); delay(1);
}
}
}

void checkPassword(){
  
if (password.evaluate()){  //if password is right open
    
    Serial.println("Accepted");
    delay(10);
    //Add code to run if it works
    digitalWrite(13, LOW);//turn on
    
    
}else{
    Serial.println("Denied"); //if passwords wrong keep locked
  delay(10);
    //add code to run if it did not work
    digitalWrite(13, HIGH); //turn on
    
}
}

#include <Wire.h>

#define NODE_ADDRESS 2  // For 1st slave, it is 1 and for third slave it is 3 
#define PAYLOAD_SIZE 2 

byte nodePayload[PAYLOAD_SIZE];
int t;
void setup()
{

  Serial.begin(9600);
  Serial.println("System made by K.V.J");
  Serial.print("Node address: ");
  Serial.println(NODE_ADDRESS);
  Serial.print("Payload size: ");
  Serial.println(PAYLOAD_SIZE);
  Serial.println("***********************");
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  Wire.begin(NODE_ADDRESS);  
  Wire.onReceive(receiveEvent); 
}

void loop()
{
  delay(100);
}


void receiveEvent(int howMany)
{
  t = Wire.read();    
  Serial.println(t);

  if (t == 49)
  {
    digitalWrite(2, HIGH);
  }

  else if (t == 50)
  {
    digitalWrite(3, HIGH);
  }



  else if (t == 51)
  {
    digitalWrite(4, HIGH);
  }


  else if (t == 52)
  {
    digitalWrite(2, LOW);
  }

  else if (t == 53)
  {
    digitalWrite(3, LOW);
  }



  else if (t == 54)
  {
    digitalWrite(4, LOW);
  }




}