Attached
This paper describe about wireless PLC communication and synchronization between two
traffic lights system using a RF 433 M Hz Transmitter receiver module and Arduino Uno
boards. Nowadays traffic lights are major characters o f traffic jam s reducing systems,
because traffic jam s can be reduced without using human involved manual system.
Though a considerable number o f traffic lights have already been established within the
roads in Sri Lanka, traffics are not reduced sufficiently so far. Therefore, synchronization
method has been implemented using cable method making it possible for vehicles to start
moving from one place and reach the destination at an average speed without being
subjected to stopping for red lights. It is noted that making changes to roads in terms of
cutting and drilling is time consuming and an expensive procedure due to many roads in
the country being developed well. Therefore cable method is not suitable for traffic light
synchronization. So an effort must be taken to implement wireless method for
synchronization using RF 433 M Hz Transmitter receiver module and Arduino Uno
boards. W hile some countries already use this method, in sir Lanka this method is not
deployed yet for the color light system.
PLC takes major place o f color light system and automation system as it is more efficient
than relay system. There are various kinds o f PLC with different brand names. Ladder is
the language that uses to program PLC. Simatic s7-1200 is a very powerful and highly
functioning PLC which has been used for this project. Voltage o f PLC I/O is 24V DC.
Therefore voltage converting device is used between Simatic s7-1200 PLC and Arduino
Uno board.
A fter implementing this system, suitable timing m ust be added to the program that we
developed. Peak hours and normal hours m ust be found as the flow o f vehicles change
with time.
