Screenshots of my SmartHome Android App..

Guys here are some screenshots of the Android App used to control devices in my smart home that i am working on....

Getting started with ESP8266-01

         

                 Wi-Fi.....Sounds good right....What if you can make your next project with Wi-Fi interface and with cheaper cost even if lower then ENC28J60 based Ethernet module.....I am sure you will be the happiest one....So how is that possible..? Ya you red right you can get Wifi at cheper price then ENC28J60 and that's by using ESp8266 Wi_Fi modules.

               These modules are extremely cheaper and easy to use. In this post i will post about how to get started with ESp8266-01 modules.

3G Connectivity With Raspberry Pi using Huwaei E303 Dongle

  Hi Guys. In this post we will see how to provide internet connectivity to Raspberry Pi using 3G USB dongle. This comes handy in many cases.The internet connection will be provided by a Huawei E303 USB 3g dongle on the vodafone network Odisha.

Setup

                            Power Source -------->RPI--->(USB) 3g Dongle

         

  The USB port of the PI doesnot have enough power to provide to a 3G dongle so if you plug directly the dongle onto the Pi the Pi may behave unwantingly which can be avoided by using an externally powered USB hub. I Raspbian Wheezy on Raspberry Pi. Next is after connecting the dongle to the Pi is to check if that has been detected by Pi. To get a list of USB connected devices type :

   $ sudo lsusb

RFID With Arduino

    Hello visitors..... Its been a hard time working with my home automation system..And this week I was working with access control system. The end goal was to allow only the authorised user to use my home automation system as well as my system can keep track of the users in and out activity. It now knows exactly i am inside or not or one of my friend is inside. For that i have used RFID Reader as well as Mobile App access token......

    Today with this post i will share how to Interface EM18 RFID reader with Arduino. EM18 is really simple to Interface.

PIR Sensor with Arduino

                           PIR sensors are really simple and easy to use as well as cheap motion detection sensor. The feature that it is easy to interface with any microcontroller makes it widely usable. Here i am providing a simple Arduino sketch to interface it with Arduino.

Circuit Diagram :

Send note as E-Mail from PC application using JAVA

Hi guys. This is my first post using my home management system. Here i am going to post codes on making a simple app that can be used to send email with notes to your own mail. this comes handy when you are working on office or other PC and you want to save something interesting, In that scenario hopefully you will not be interested to open your mobile and get on typing. Hope this helps. But to use this you need to enable IMAP and POP in your mail settings.

** Make sure yo change your mail username and password in saveNote.java File.

From now on i will be providing codes on bitbucket only.

GIT :   https://bitbucket.org/oksbwn25/mailmynote

OSMC (XBMC) Remote using JAVA

hi guys its been a long time since my last post. But here comes a post you would really like. It's something i have been looking for a while now.

Custom Character Generator for 16x2 LCD

 

This is custom character generator developed using JAVA which can come handy while working with 16x2 LCD. The EditText box shows the array with dataof 8 rows in decimal. Below i have attached the source

DHT11 Sensor Interfacing with Raspberry Pi

  Believe me guys i struggled a lot to Interface DHT11 sensor with the Raspberry Pi for my smart home. As i have already opted Pi4J for JAVA programming it was hard to interface with Pi as Pi4J doesn't support one wire protocol. I did lot of research but nothing worked out. Finally i gave a try to python and it worked perfectly. But  as my complete firmware is using JAVA. I opted a way that i will interface it using python but will be executed from JAVA.

External ADC with Raspberry Pi.

           Really I tried a lot with MCP3208 external ADC to interface with the Raspberry pi. Searched for various codes but nothing was available in JAVA. So after some research i got some python code and modified that to JAVA.  in this i have used the Pi4J library.

/****
*Author : Bikash Narayan Panda
*Use : This is used to read ADC data foem the MCP3208 SPI based ADC.
*Date :19/Nov/2014
*Tags: Please Include the Pi4J Library.
*
*
**/
import java.io.IOException;
import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalInput;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.PinPullResistance;
import com.pi4j.io.gpio.PinState;
import com.pi4j.io.gpio.RaspiPin;

public class SensorTest {

    public static int readadc(int adcnum, GpioPinDigitalOutput clockpin,
            GpioPinDigitalOutput mosi

Modify your old PC SMPS to BenchTop Power Supply Unit

Many time we do have old SMPS of no use to the computers. Those SMPS can be modified as bench-top power supply system providing -12,+12,+5,+3.3 volts. I have used one to power my all arduino based home automation modules and the Raspberry Pi. Here  i am going to post how to mod an old SMPS .

You just need following components along with some  basic tools

                                             1.Screw Terminals.
                                             2.Switch (On/Off).
                                             3.10Watt Resistive load (May be 5K or 10K i have used 4.7K working fine)

Using Raspberry Pi Serial Port

             By default the Raspberry Pi’s serial port is configured to be used for console input/output, it means you can't use the Serial Port in your programs and  needs to be disabled.To enable the serial port for your own use you need to disable login on the port. There are two files that need to be edited

The first and main one is     

              

 /etc/inittab

This file has the command to enable the login prompt and this needs to be disabled. Edit the file and move to the end of the file. You will see a line similar to

                      

Algotithm to Convert 4 byte Hex to 32 bit float

 I really struggled hard to find out some sorts of algorithm to convert 4 hex bytes to 32 bit float for my requirement on some analysis of MODBUS protocol. I didn't find it and it tok me nearly 2 days to design this. Here is the algorithm..

float ModbusRead(byte id,byte msbAddress,byte lsbAddress,byte msbCrc,byte lsbCrc)
{  
    num=1.00;
    Serial.write(id);
    Serial.write(0x03);
    Serial.write((byte)msbAddress);
    Serial.write((byte)lsbAddress);
    Serial.write((byte)0x00);
    Serial.write(0x02);

Running particular application when Rspberry Pi boots up

              While using Raspberry Pi you might not be interested to take  a mouse and keyboard to run certain application when the Pi reboots. To avoid this many procedures are available . In this post i have used crontab to run a JAVA based application each time the Pi reboots. Actually crontab provides many more features.

Run GUI based application on raspberry Pi Startup

          Belief me i went through several websites and tested many proposals to run my JAVA based GUI application on Raspberry Pi start-up. Finally the following worked out

First check inside the .config folder if it contains autostart folder or not , if not then create a folder named as autostart.

Power Over Ethernet (For Ethernet Connected Devices)

         Power Over Ethernet is a widely used concept to power up remote devices like Arduino, Raspberry pi or any other embedded devices working on low voltage and power.There are ready made modules available in the market but are expensive so in this tutorial i will show you to make the cable modified to work for POE.

Cheap Ethernet connection to Arduino using ENC28J60 module

      While working on Ethernet projects with Arduino the basic hardware we require along with Arduino is the Ethernet Shield. But the problem is that in a constrained budget the buying one Ethernet Shield is not possible which leads to other options and a good one is ENC28J60 Ethernet chip by Microchip.This is not as smart as the Wiznet W5100 chip based Ethernet shields but are quite useful as those.This post i am going to write all about interfacing the ENC28J60 module to Arduino UNO as well as Arduino mini Pro.I have used EtherCard library for the coding to interact with the module.

     

          Below is the wiring diagram for Arduino UNO.

    
  Code:

#include <EtherCard.h>
#define PATH    "temp.php"

byte mymac[] = { 
  0x74,0x69,0x69,0x2D,0x30,0x31 };
uint8_t ip[] = { 
  192, 168, 0, 8 };          // The fallback board address.
uint8_t dns[] = { 
  192, 168, 0, 1 };        // The DNS server address.
uint8_t gateway[] = { 
  192, 168, 0, 1 };    // The gateway router address.
uint8_t subnet[] = { 
  255, 255, 255, 0 };

char website[] PROGMEM = "192.168.0.10";
static byte session;
byte Ethernet::buffer[800];
uint32_t timer;
Stash stash;
float temp_R=0;
int tempPinR = A0;
String cont="";
int led = 9;
int sw1 = A1;
int sw2 = A2;
int sw3 = A3;
String sReply="";

Room temperatuer logger using arduino and JAVA

 This post is all about a temperature logger module using two sensors(LM35) and uses serial communication to log data to MySQL server. And it does so by using Arduino at the logger end and JAVA at the server.

  The concept is so simple that the Arduino uses LM35 (providing analog output for measured temperature) ,which is connected to one of the analogIn pin of Arduino. The sketch burned to Arduino converts the read value from the pin to corresponding temperature. And it sends the data through the serial port.

  At PC side a JAVA application runs which uses TxRx library for communicating with the serial port. The application reads the data from the serial port and acknowledged to Arduino. It then saves the red data to a database.

Control VLC Player using Android (Wifi Connected)

    My first application of Android comes here.In my first tutorial on Controlling VLC using JAVA you can see that the VLC provides a Web interface from which it can be controlled and it also accepts certain commands.So that can be used to control the media player in Local Area Network using any programming language.This time its Android

Code:
MainActivity.Java

package com.example.first_app;
import java.net.Authenticator;
import java.net.URL;


import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;

4 Channel relay board using L293D

         Many time it requires controlling relays to automate different things in projects.But thing is generally Relays are driven by either high voltage and requires high current but most of the embedded systems works at lower voltage and the constrain is they cant provide high current.