Traffic light with CD4017
For made a simply trafic light you can use a CD4017 who is Decade Counter with 10 Decoded Outputs. Also, it use CD4093 as tact generator.
For made traffic light must decoder module made with few diodes:
For 10 clocks, first 4 clock are used for green light, next clock is for yellow, next 4 for red and last clock is for red & yellow.
I use Live Wire software for simulate the circuit and put traffic lights drived by 4017 ver1 movie on my youtube channel:
Schematic from beginning of article are designed using older version of Eagle PCB software. Also, I design PCB for this schematic:
You can download PCB in pdf format: base circuit & decoder module !