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traffic light controller
AIM The main aim of this project is to design a Traffic light controller using 8085 microprocessor. The 8085 Microprocessor is a popular Microprocessor used in Industries for various applications. Such as traffic light control, temperature control, stepper motor control, etc. In this project, the traffic lights are interfaced to Microprocessor system through buffer and ports of programmable peripheral Interface 8255. So the traffic lights can be automatically switched ON/OFF in desired sequence. The Interface board has been designed to work with parallel port of Microprocessor system. The hardware of the system consists of two parts. The first part is Microprocessor based system with 8085. Microprocessor as CPU and the peripheral devices like EPROM, RAM, Keyboard Display Controller 8279, Programmable as Peripheral Interface 8255, 26 pin parallel port connector, 21 keys Hexa key pad and six number of seven segment LEDs. The second part is the traffic light controller interface board, which consist of 36 LEDs in which 20 LEDs are used for vehicle traffic and they are connected to 20 port lines of 8255 through Buffer. Remaining LEDs are used for pedestrian traffic. The traffic light interface board is connected to Main board using 26 core flat cables to 26-pin Port connector. The LEDs can be switched ON/OFF in the specified sequence by the Microprocessor. The block diagram of the system is shown in fig.1. The lay out of the traffic light is shown in fig 2. FIG.2 LAYOUT OF TRAFFIC LIGHTS 8085 CPU Latch 8255 PPI 26 pin port connector 26 pin port connector Buffer AD0-AD7 A0-A7 26 pin FRC cable D0-D7 System Bus EPROM RAM 8279 keyboard Display Controller Anode driver Stop PE Decoder Keyboard Cathode driver Traffic light interface board Fig 1 Block diagram of Traffic Light Controller Stop PW Stop PN Stop PN Stop PW Stop PE Display Go PW Stop PS Go PS Stop PS Go PS Go PE Go PW Go PN Go PN Go PE NORTH SOUTH EAST WEST Stop W Warning W Go W FR W FL W ST W Stop N
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