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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.
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