In this article, we will learn how to control our IoT home appliances using the messaging app WhatsApp to easily and effectively communicatie with those devices. So we will be sending WhatsApp messages to a number of “lights on,” and lights at our house will turn ON. Components required  Tools Required/ libraries required: WhatsApp API…

We use so many appliances at home that often it becomes a headache to keep track as to whether everything is switched off or not, especially after stepping out of the house. Home automation or smart home is a key that keeps you away from all these worries by automating the appliances and connecting them to a common network.It is basically a home where everything including the lights, alarm clocks, television, doors, windows, blinds, heating and cooling systems can talk to each other. Not only this, all such automated devices also receive as well as interpret their owner’ instructions and then behave accordingly. The success of home automation, to some extent, relies on the availability of smartphones as they can be easily connected to other devices through the internet and are highly portable.

Now a day’s everyone needs a device which could control appliances wirelessly. This makes us to operate them on our fingertips from particular vicinity with ease.This time I have done something like this, I have created a prototype of a device which controls 4 devices/appliances separately using RF (Radio Frequency) technology. The device comprises of two sections: Transmitting (remote) and Receiving part. The transmitting part works as a remote device to send the corresponding data to the receiver section. It further consists of 4 SPDT (single pole double throw) switch, one Encoder IC (HT12E) and a TX module (433 MHz). These 4 switches are connected to the 4 data pins of the encoder IC to generate a 4-bit data to be transmitted. The switches provide either high (+5V) or low (0V) signal levels. 

In present time there are many types of Home Automation Systems available in our market. Most of these are simple home appliances controlling systems like DTMF controlled home Appliances, IR Remote based home appliances controlling, RF based home appliances controlling. And here, we are going to discuss about GSM based Home/Office Appliances Control (Home Automation System).But this is a very common system, in which users can also use this system at farm house and house, offices for filling the water tanks. This system can also be used for start motor or Stop motor at defined time when water supply available.  

This project uses DTMF technology to control home appliances. DTMF stands for Dual Tone Multi Frequency.This DTMF based system can control home appliances via mobile phone communication from anywhere around the world.This facilitates the user to operate anything on his fingertips.It requires two cell phones to operate properly; one of them will always remain in touch with the circuit and another to place a call on that phone. 

{C}{C}{C}{C}{C}{C}{C}{C}{C}{C}{C}{C}{C}This project based on DTMF(Dual Tone multi frequency) which generates in cellular cell phones. By using this thing of cell phone we control the home appliances from anywhere in the world(In Network Area). Below you can see the diagram of DTMF keypad. When we press any key then it generates a frequency after mixing two frequencies. And then send it to the receiver end over communication channel.User can activate their devices using this DTMF keypad as he/she want to activate. The encoder encodes the user input and sends via a communication channel. The receiver receives the modulated signal and demodulates it and the user input. In this system, we are going to make a DTMF based home/office appliance. How is the PCB Designed? What dimensions of the code are kept in mind? Continue reading to know more.

This project uses the Renesas microcontroller based development board called GR Sakura. Detailed here is the method of enabling the Ethernet module of the Sakura board, how to configure it as a server and also how to control them using a web page provided by the Sakura board for those who tries to connect with the board using an internet enabled PC, mobile phones etc. The LM35 temperature sensor is connected with the board for sensing the temperature and turning on/off the lights are demonstrated by the LEDs connected to the I/O port which can be easily replaced by a light driving circuit or relay. The demonstration of a small remote home automation system is done which can be used to control two lights and read temperature of a room from anywhere around the world using internet enabled devices. 

In this technological world, automatic systems are being preferred over manual system. In this series Home Automation plays an important role for humans. In this unit we talk about basic needs to understand the project well and also for its future advancements. We are going to talk about different types of sensors (i.e. Temperature Sensor, LPG Gas Sensor, LDR) and input and output devices (i.e. 2×2 matrix Keypad, Buzzer, DC Motor, 16×2 Char LCD Display, Power Supply section etc.).Now we are going to Interface all those with the brain of the system ‘Microcontroller (i.e. ATmega16/16L)’ and let’s find out what the individual role of each component are and how they act as Smart Home System together.  In this project I used three analog sensors i.e. Temp, LPG Gas and LDR. These are given analog output. Read more to find out how the circuit looks like and what is the code.