Traffic light with different time delays

Thread Starter

Salaudeen Ilyas

Joined Jun 29, 2016
2
I am designing a traffic light using logic gates only, but i'm having problems giving different delays between the LEDs; say GREEN ON for 4secs, YELLOW ON for 2secs, and RED ON for 4secs. How do i implement this using 555 timer?
 

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Thread Starter

Salaudeen Ilyas

Joined Jun 29, 2016
2
Welcome to AAC!


These statements are in conflict. Either you're using only logic gates or you aren't.

Is this homework?
thanks for your reply.

yes its homework and we have to use both.
we are to use combinational/sequential cct. for the lights and to use a 555 timer to give pulse and delay to the clock of the sequential counter.
but i don't know how to include delays in between the LEDs
 
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