Design a pedestrian traffic controller system using switch as input and $3$ LEDs $($Red$+$Green$+$Yellow$)$ as traffic light indicator. Upon pressing the switch, the Yellow LED will light on for $5$ second then turn OFF. After that the Red LED will turn ON for $15$ sec before turning OFF. Lastly, the Green LED will turn on until the switch is pressed again. The LED pattern will be repeated every time the switch is pressed. Draw the flowchart for your program first before start writing the code.