Two way Traffic Light. How to transition.

Thread Starter

nubpwn3r

Joined Oct 15, 2015
15
We were tasked to make a two way traffic light.
Ive thought of hwo to make it.

I will use two 15 seconds timer for the Green and Red display and use flip flop for a 3 second countdown for the yellow

The only problem i have at the moment is how to switch/make the transition between the timers.

Like: 15 seconds BCD counter for green, then adter the 15secsonds, id like to switch to the yellow 3 seconds countdown timer then to the Red.

As of now, i just read about the decade counter IC 4017 it could be a good alternative for the BCD 15 seconds timer, but still, how do I make the transitions between timer? THANKS IN ADVANCE!!! :))
 

djsfantasi

Joined Apr 11, 2010
5,579
Depending on if you are limited to exactly those times (e.g., can yellow be 5 seconds?), a 4017 will do the transitions for you. And you only need one counter.
 

Thread Starter

nubpwn3r

Joined Oct 15, 2015
15
Depending on if you are limited to exactly those times (e.g., can yellow be 5 seconds?), a 4017 will do the transitions for you. And you only need one counter.

I chose the yellow light to only be 3 seconds :)) cuz it would be too odd to see a yellow light on for 5 secs, but yea we are not restricted on that condition :))

please correct me if im wrong, but 4017 is only 10 counter right?
and by saying it will do transitions for me, you mean, by cascading them?

Edit1: Im getting an idea already. Thx!!

Edit2: 4017 counter have A - J individual outputs yes? Is it possible to connect all outputs A - J to only 1 LED? What I have in mind is to let the LED stay on for the set period of time
 
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