System Description:

Control Unit which is installed at the transmitter end, mainly consist of Arduino board based on a 32-bit ARM core Microcontroller, Relay interface board and Power supply. Fig1 shows the block diagram of control unit setup.

The transmitter’s both analog and binary parameters are connected to the control unit. The control command is given to the transmitter through the relay by controller itself. Initially both the transmitters (primary and standby) should be in local mode. If primary transmitter fails or forward power is less than 50 Watt then the control unit will issue the switch off command for the primary transmitter, and simultaneously changes the RF switch in position to standby transmitter and switches on the standby transmitter. If standby transmitter also fails, then controller sends the email and SMS to the controlling officer and switches off the power supply of the transmitter unit. Relay and Arduino board are operated through 5 volt dc for its operation. Status of external parameters like humidity, temperature, phase voltage are fed to the controller through the transducers. The transmitter data is displayed on computer monitor/ mobile screen and the same is stored in database running in the back end. The web page GUI (Fig.2) periodically accesses the transmitter data through internet.

Data communication between the transmitter and control unit is through the serial port (COM) of computer. Further improvement can be introduced by providing ethernet shield board connection to the Arduino board for data transfer and data storage to the server.