14-08-2012, 11:20 AM
TRAFFIC LIGHT CONTROLLER USING 8085 MICROPROCESSOR
H Traffic light controller-n.doc (Size: 115 KB / Downloads: 170)
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 LED’s.
The second part is the traffic light controller interface board, which consist of 36 LED’s in which 20 LED’s are used for vehicle traffic and they are connected to 20 port lines of 8255 through Buffer. Remaining LED’s 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 LED’s can be switched ON/OFF in the specified sequence by the Microprocessor.