Home automated system using Bluetooth and an android application
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The home automation system is nothing but a term used to describe the working of all household appliances. Smart Home Automation let the user to control the home from his or her phone and assign actions that should happen depending on time or other sensor readings such as light, temperature or sound from any device in the Home Automation network. Figure-7 illustrates the interface of Android GUI selecting bluetooth device.
The Arduino is connected to the main PCB which has five relays as shown in the block diagram. These relays can be connected to different electronic devices like lights, television, fan, etc. A Bluetooth dongle or a standard Wireless Access Point is used to provide connectivity between the server and the mobile device. The system is capable of detecting when the user enters or leaves the room by measuring the change in environmental thermal equilibrium, and can accordingly turn on or off appliances such as lights and fans. The power supply for each appliance is wired through an electromechanical relay. A number of relays are used depending on the number of appliances to be controlled.
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A Smart phone is a mobile phone based on a mobile operating system, with more advanced computing capability and connectivity than a feature phone. Android is a software stack for mobile devices that includes an operating system, middle- ware and key applications. Android, by simple definition, is an operating system for many mobile phones. Android is a customizable platform that can look and feel very different on every different handsets.
A LINK status pin to the microcontroller from the Bluetooth UART tells it that the android client is successfully connected to the host. Next, to control two light one inside and other outside the home , a fan/AC and a television we have four relays connected to the microcontroller via the NPN transistor based buffer circuit. The relays consume a lot current while being activated and the microcontroller on any pin can source only 20mA of current so a buffer circuit is utmost indispensable between the relay and the controller. Arduino based home automation using Bluetooth project helps the user to control any electronic device using Device Control app on their Android Smartphone. The android app sends commands to the controller – Arduino, through wireless communication, namely, Bluetooth.
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Here it serves the purpose of data acquisition from the sensors and comparing then with the programmed values stored in the microcontroller’s EEPROM and then actuating the devices accordingly. A 16x2 character LCD is used for displaying the messages, appliance state and sensor readings. It is directly connected to the microcontroller in 4-bit addressable mode. Whenever a new action or event is raised like fire alarm, LPG leak, etc it is displayed on the LCD too. Next we have the Bluetooth UART module connected to the serial port of the microcontroller. It act as an access point for the android client on the another side and logically it act as complete serial cable replacement for the serial port.
It is possible to vary the intensity of light and speed of fan by using a number of types of dimmers. Modern dimmers are built from silicon controlled rectifier instead of variable resistor, because they have higher efficiency. Since silicon controlled rectifier switches between a low resistance “ON” state and a high resistance “OFF” state, it dissipates very little power compared with the controlled load. Dimmer circuit is based on SCR control circuit which is used in lightning control and fan speed control. This section mainly discuss about the hardware construction of mai control board.
Senior Digital Consultant (w/m/d) IoT/IT für Real Estate Smart Buildings & Infrastructure
Consequently, providing facilities and security are becoming increasingly prominent features on mobile devices. In this paper, we have to developed a home automation system that interfaces with Android mobile devices. The mobile device and system can communicate with each other from long-range via Wi-Fi. The mobile application can be loaded and interfaces with system from any compatible device. The system then acts and respond to these commands by taking actions per commands and gives the result to the user. The user can also see the result on Android mobile application from anywhere.
Android remote control based home automation consists of Android OS operated Graphical User Interface with wireless communication modules such as Bluetooth and Zigbee to have control on different home appliances. In this circuit diagram AT89c52 microcontroller is used which consist of CPU, RAM, ROM, timers and input, outputs ports .It is just like a computer only difference is the memory and also no need to use any microprocessor to make any function. The AT89c52 is low power, high performance 8 bit microcontroller with 8k bytes programmable flash memory. The device is manufactured using Atmel high-density nonvolatile memory technology and is compatible with the industry standard 80c51 instruction set pin output.
Remote-controlled home automation system via Bluetooth home network
When an LPG leak is detected the output of the LPG sensor decrease gradually and that is being sensed by the ADC of the microcontroller. After them, we used a hook switch to sense the door whether it is opened or closed. This sensor is connected to the digital input pin D.7 of the microcontroller pulled up externally.Whe the door is closed, the hook switch is closed and the output is logic low as it bypasses the ground. When the door is open, the hool switch is also open and it bypasses logic1 throught 10k resistor to the output. To sense the presence and motion we used the PIR sensor that has a digital output and it is also connected to the digital input (pinA.4) of the microcontroller pulled up externally. When a motion is detected ,the output goes high for a few seconds and comes back to low in case of absence of motion.
In this project we are also using Arduino board and Arduino Wi-Fi shield. Temperature sensors will also detect the high and low temperatures which will identify the temperature and will notify it on device. The android application developed will allow user to manually switch ON and off the lights. The starting from the power supply section, we have the 9V AC input from the secondary output of the transformer. This is the fed to the bridge rectification section that converts AC supply into DC supply. Then on the DC output of this section a large capacitor and another small 100nF capacitor is there to filter the DC supply and remove off all AC components from it.
The home automation system differs from other system by allowing the user to operate the system from anywhere around the world through internet connection. The system will automatically change on the basis of sensors’ data. This system is designed to be low cost and expandable allowing a variety of devices to be controlled.
You can also program your motion sensor to raise an alarm if it detects a motion. Here you can manually turn ON/OFF each appliance individually or can simultaneously switch all ON/OFF in one go. The schematic is designed in the schematic editor and the board is designed in the board editor.
Simply logging in the android application will grant access to the user to control and automate his home wirelessly. Use a host device that will be mounted on wall and will have connection to all your home appliances like lights, fans, etc and to all the sensors. As the android application is password protected ,it automatically adds security to your home as it can be controlled by the user only. Then, at the receiver side, the Bluetooth modem receives these signals and processes them according to the code, and finally sends the control signals to the relay-driver IC. This driver IC energizes the respective coils to switch the appropriate loads.
This project can provide the facility of monitoring all the appliances with in the communication range through Bluetooth. But after login, it only displays the main screen of turning on and off the appliances. The settings option does not appear where i can connect to the bluetooth. Basic4android language is similar to Visual Basic language with additional support for objects.Basic4android compiled applications are native Android applications, there are no extra runtimes or dependencies. Unlike other IDEs Basic4android is 100% focused on Android development. Basic4android includes a powerful GUI designer with built-in support for multiple screens and orientations.
Smart house system consists of many sub-systems that controlled by Microcontroller software as a main controlling system. Also, SHS was supported by remote control system as a sub- controlling system. The system is also connected to a wireless bluetooth technique to monitor and control the electronic house equipments from anywhere in the world using both Arduino and micro controller.
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