This paper presents wireless Relay control application i.e. Either by Bluetooth, Zigbee or WI-FI. We have numerous applications using relay control project. The system is based on the embedded system and it can act as a security guard of the home. It can be used to control the electrical appliances at home. Bluetooth technology handles the wireless part of the communication channel; it transmits and receives data wirelessly between these devices. It delivers the received data and receives the data to be transmitted to and from a host system through a host controller interface (HCI). The most popular host controller interface today is either a UART or a USB .The whole system is a cheaper one, but it provides the full-scale device control function.
This project is mainly based on mobile phone communication with the Microcontroller through Bluetooth. Connect the Bluetooth module with microcontroller using the serial port communication. Then dump the following code in flash memory of controller and connect the Bluetooth module 2 with PC and open the HyperTerminal open select the com – port and set the baud rate or select restore default. Then start pairing the Bluetooth module from PC side, transfer the message from transmitter and in the receiver side the message will be displayed on LCD. There is a controlling application also added in this project we can ON/OFF the device from Transmitter side. From Bluetooth module 1 start entering the message whenever the message ‘3’ is entered and sent the relay will be switched ON and if we send ‘4’ Relay is switched OFF. Using the Relay we can switch ON /OFF the electrical device.
PS-BLUETOOTH EVK is powered by LM TECH-LM400 and Parani-ESD210 is Class 2 type of Compact Embedded Bluetooth Serial Modules for RS-232 cable replacement. By default, they support 30 meters of wireless transmit distance. The Parani-ESD210 has an extension option so that users can extend the transmit distance up to 300 meters using optional antennas. Users may configure the LM Tech-LM400 Series by using easy-to-use Windows-based utility software or by using standard AT command set.
To connect the Bluetooth device, you will need to find the Rx and TX pins on your microcontroller. Make sure that you cross the wires by connecting the Rx pin from your Bluetooth device to the TX pin on the microcontroller, and the TX pin from your Bluetooth device to the Rx pin on the microcontroller. Install the Bluetooth SPP software in Android based Mobile and pair the device and start the communication between Mobile and Microcontroller Bluetooth SPP provides Bluetooth connectivity for all android apps:
Wireless relay control is an application which can be used for multiple applications. It can be used to control the electrical appliances through Bluetooth or with Mobile. The whole system is a cheaper one, but it provides the full-scale device control function. We think this product have high potential for marketing in the future.
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