AbstractAutomation refers to the use of computer and information technology to control other objects. The automation system range from simple remote control of lighting through the complex computer/micro-controller based networks with varying degree of intelligence and automation. The basic principle of automation can be further extend to the automation of Wireless Optical Transceiver in the Optical link system to adjust it line of sight with corresponding other station. The proposed system consist of two main components; the micro-controller (8051), which is the decision making part of the system. When the light intensity decreases at the base station controller (B.S.C). The micro-controller will send a message to the stepper motor, so to adjust the line of sight between transmitter and receiver. When the line of sight is achieved, message will be flashed on the LCD of establishing link. Furthermore, Android application is also proposed to control the automatic system using internet or in Bluetooth technology.IntroductionThe automation industry has improved the quality of life of human, by providing facility, flexible, comfortable health life.Wireless technologies are of the popular technology for the automation industry. This integration of wireless communication technologies and automation system relive the customers from manually controlling various devices.Home automation is are of leading concept, in which various devices with embedded Bluetooth technology can communicate with each other, and can also be controlled by central controller station ( Mobile Phone ).The home technology offered by the homes of Tomorrow offer life style of comfort and convenience. The technology consists of a wall touch screen, which can control many home appliances.The other wireless communication standards which are helpful to exchange data and signaling between components are Zigbee, Wi-Fi, and global system of mobile communication (G.S.M).The main feature of the G.S.M consists of availability of mobile network accessing the main controller system through G.S.M modern from any location across the country.The idea of G.S.M based home automation system is extended to billing system for electricity, gas and water using the Short Message Service (SMS) structure of the G.S.M network. The high cost of ownership, and technical handles related to the operation and maintenance and paying S.M.S service changes.In this paper, we present low cost, highly effective automation system with which the line of sight is maintained between Wireless Optical Transceivers for free space optical links. The proposed system can be controlled by: Internet/mobile app Self-AdjustingThis Automated system can also be used for antenna tilt optimization. In tilt optimization the antenna is tilt downward mechanically in the cell of G.S.M, in certain specify degree.This paper is organized as follow. In section 2, the systems general architecture and hardware implementations are discussed. In section 3 we then describe the system software development. Finally we conclude our major findings and outline of our future work.

System ModelThe basic requirement for free space optical or microwave link is to maintain the line of sight between in order to have the desire signal level at both ends. The mount structure supporting both the wireless optical transceivers in wind or thunderstorm may not hold the equipment. Thus we need a system having capability to move the wireless optical transceivers to the desired location for establishing optical link again. The idea of proposed system operating in two mode consist of self-adjusting the Microwave dish or optical Source or Manually can be used to control the position of the equipment.Figure 1: Schematic showing free space optical link

System ImplementationLet suppose for wireless optical link the Light Emitting Diode (L.E.D) act as transmitter sends the beam of light to the receiver side, if the receiver side consist of Light Dependent Resistor (L.D.R) get the required power of the light from L.E.D as result the transmitter and receiver are aligned.The transmitter circuit consisting of L.E.D emitting red light used to establish optical link with the receiver (L.D.R) and its resistance depend on illumination. Following the basic operating principle of the L.D.R, change its physical properties according to the intensity of light and do not produce electricity. The voltage obtained from the potentiometer with L.D.R is amplified by Operational Amplifier LM358. The Microcontroller will compare this value to pre-define threshold and the result will be display at the L.C.D. For voltage above or equal to threshold the display shoe status (signal is ok). In case the signal is not collected then it will display (signal is not ok).

Figure2: The Microcontroller Circuitry and LCD display.

Figure3: The LCD display depicting the establishment of Line Of Sight between Transmitter and Receiver.Scenario A (Automatic or Self Adjusting Mode)In this case we have two options set the controller in automatic mode this will automatically aligned the microwave generator, by rotating the microwaves module. As controller doesnt have enough power to operate the motor directly so for that the rotation signal will be provided by controller through array of transistors.

Figure4. Stepper Motor for moving the Receiver

Scenario B (Manual Mode)The second method is by doing the through internet by sending command to local PC. As controller cannot communicate with PC directly so we need to use max 232 (which is interfaced between controller and PC) pin 10 of controller is receive (RX) pin which receive the data from PC through Max232,Connection of each module and component is given in circuit diagram.

Conclusion

This project demonstrated that possibility of designing and implementing through hardware automation system which can adjust the line of sight between wireless optical transiveres acting as bridged between different LANs, MANs and WANs. The free space optical link enables the customer to access various telecommunication network services demanding high bandwidth act as local loop connection. The automated system worked in both modes of self-adjusting and Manual controlled.