Serial port Bluetooth module have a Bluetooth 2.0+EDR (enhanced data rate), 3Mbps modulation with complete 2.4GHZ radio transceiver and baseband. Hc-05 module is used for this purposes, which is low power 1.8 v operation, PIO control with integrated antenna, edge connector and is easy to use with Bluetooth SPP (serial port protocol).This is designed for transparent wireless serial connection setup.
Relay driver circuit ULN2003 is used to drive relays.įor the communication between mobile phone and microcontroller Bluetooth module is used, because the microcontroller can’t do all this work itself. you can check relay interfacing with microcontroller to know more about it. Three relays RL1, RL2 and R元 are connected to the microcontroller through the print circuit board for controlling the home appliances. The device is manufactured using Atmel high-density nonvolatile memory technology and is compatible with the industry standard 80c51 instruction set pin output.
The AT89c52 is low power, high performance 8 bit microcontroller with 8k bytes programmable flash memory. It is just like a computer only difference is the memory and also no need to use any microprocessor to make any function. In this circuit diagram AT89c52 microcontroller is used which consist of CPU, RAM, ROM, timers and input, outputs ports.
The feedback circuit is run at 220 V.Ĭomponent of Android phone based home automation system This communication is called half duplex. The communication is done one by one at one time in both direction between the android mobile phone and Bluetooth module. Once the command has sent to turn on the device, then the feedback circuit first check the current status then send the command to turn on and the circuitry led indicates the turn on device, otherwise the device indicate the malfunctioning that the command was not executed successfully. A feedback circuit is also designed and implement to check the current status of the device after it receives the command from mobile phone. In this block diagram microcontroller is programmed in C language and used to turn on and off the appliances, which are connected through relays, when we send the commands through Bluetooth from a mobile phone. This board has 32 digital input and outputs ports.īLOCK DIAGRAM of Bluetooth based Home Automation
Here HC-05 Bluetooth module and 8-bit microcontroller atmel89s52 is used for switching. In this report, we have proposed a low cost, flexible secure automation system that can easily control TV, tube lights and fans from android based mobile phone using Bluetooth. Home automation is not a new thing but the advanced automation system in nowadays require a big and expensive infrastructure. In this report, an android based smart phone is used. Client module and host controller are used to communicate with each other through a wireless device such as Bluetooth enabled the mobile phone. In this report, all the devices which are used in building management system are control by a single controller using a wireless network.