DefinePK

Abstract

This paper presents a novel approach in designing and implementing a laser-based wireless channel communication system. Both the transmitter and the receiver were successfully designed and implemented practically. The transmitter side consists of the input unit represented by a PS2 keyboard, a controlling unit achieved by a PIC16F887 microcontroller and a transmitting element represented by a 620 nm wavelength laser lens device for bit pattern transmitting. On the receiver side, a light-sensor made of light dependent resistor (LDR) is used as a receiving element by which laser beam, which is adopted to be the holder of the transmitted signal or data is sensed. Also, another PIC16F887 microcontroller is used as receiver controlling unit. In order to display data transmitting and receiving, a piece of display platforms is located on both sides. By uploading a firmware program in the PIC control unit, synchronization between receiver and transmitter has been achieved and verified. Data transfer is done through serial bit by bit technique. Therefore, the synchronization code ensures that the receiver should wake up and synchronize itself as soon as sensing new received data in order to keep the data in a correct order. The proposed work proved the simplicity in design as well as the low cost value PIC16F887 microcontroller. Moreover, the results of data transferring show an exceptional accuracy with an error-free system. However, data transfer is still obligated to the line of sight condition which requires the laser element to be accurately positioned in the path of the LDR receiving element. By real life system verifications, this work offer powerful satisfactory that will be cost- effective which in returns suits certain design and product requirements with respect to both cost and security.