hey i have designed a simple circuit that generates the sequence of the traffic lights
with arduino uno and red,yellow,green LEDs
the ON push button starts the sequence and the OFF push button stops it
here is a simulation of the circuit also i have attached the c code of the circuit enjoy 
https://www.mediafire.com/view/hiqhg3mj44kw1dc/New_Text_Document.txt
Post time: Jun-16-2017