13-02-2013, 03:01 PM
SHEET Traffic Light System
Traffic Light System.docx (Size: 44.1 KB / Downloads: 23)
INTRODUCTION
This project operates red, amber and green LEDs in the correct sequence for a single UK traffic light. The time taken for the complete red - red & amber - green - amber sequence can be varied from about 7s to about 2½ minutes by adjusting the 1M preset. Some amber LEDs emit light that is almost red so you may prefer to use a yellow LED.
The 555 astable circuit provides clock pulses for the 8051 counter which has ten outputs (Q0 to Q9). Each output becomes high in turn as the clock pulses are received. Appropriate outputs are combined with diodes to supply the amber and green LEDs. The red LED is connected to the ÷10 output which is high for the first 5 counts (Q0-Q4 high), this saves using 5 diodes for red and simplifies the circuit.
CIRCUIT DIAGRAM
POWER SUPPLY:
• 9v Ni-Cd battery: This battery is used as a supply for transmitter circuit.
• 5v supply: 5v supply is used to provide power to the control circuit.
• 12v supply: 12v supply is used to provide power to the motor driver circuit.
Applications
1. This project operates red, amber and green LEDs in the correct sequence for a single UK traffic light.
2. most advanced traffic system.
Future Progress
1. We can add water proof cameras on the road to trap the vehicle.
2. This camera can be powered by focusing light to light on the dark surfaces.