Traffic Light Controller Using 8085 Microprocessor Pdf Free 11

Traffic Light Controller Using 8085 Microprocessor: A Project Report

Traffic lights are essential devices for regulating the flow of vehicles and pedestrians on the roads. They require sophisticated control and coordination systems to ensure safety and efficiency. In this project, we designed and implemented a traffic light controller using 8085 microprocessor, interfacing with peripheral device 8085, and program implementing the process.

Introduction

The 8085 microprocessor is a popular microprocessor used in industries for various applications, such as traffic light control, temperature control, stepper motor control, etc. It is an 8-bit microprocessor with a 16-bit address bus and a 8-bit data bus. It can operate at a maximum frequency of 3 MHz and can execute 74 instructions. It has five hardware interrupts and one software interrupt. It has three maskable interrupts (INTR, RST 7.5, RST 6.5) and one non-maskable interrupt (TRAP). It also has a serial input/output port (SID/SOD).

The peripheral device 8085 is a programmable peripheral interface (PPI) that can be used to interface the microprocessor with various input/output devices. It has three 8-bit ports (Port A, Port B, Port C) that can be configured as input or output ports. It has two modes of operation: mode 0 and mode 1. In mode 0, all the ports can be used as simple input/output ports. In mode 1, Port A and Port B can be used as input/output ports with handshake signals, and Port C can be used as control port.

The traffic light controller interface board consists of 36 LEDs that simulate the traffic lights for four directions (north, south, east, west) and two pedestrian crossings (north-south, east-west). The LEDs are connected to the ports of PPI through buffers. The interface board is connected to the main board using a 26-pin parallel port connector.

Design

The design of the traffic light controller involves the following steps:

Defining the traffic light sequence and timing for each direction and pedestrian crossing.

Designing the circuit diagram for the interface board using LEDs, buffers, resistors, and connectors.

Designing the circuit diagram for the main board using microprocessor, PPI, EPROM, RAM, keyboard, display, power supply, and connectors.

Writing the assembly language program for the microprocessor to implement the traffic light sequence and timing using PPI ports.

Testing and debugging the program using an emulator or a simulator.

Burning the program into an EPROM chip and inserting it into the main board.

Connecting the interface board to the main board using a parallel port cable.

Powering up the system and observing the traffic light operation.

Traffic Light Sequence and Timing

The traffic light sequence and timing for each direction and pedestrian crossing are shown in the table below:

Direction/PedestrianRedYellowGreen

North10 s3 s10 s

South10 s3 s10 s

East10 s3 s10 s

West10 s3 s10 s

North-South Pedestrian--6 s

East-West Pedestrian--6 s

The traffic light sequence follows a cyclic pattern as shown below:

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