Traffic Light Project #3: Light Controller Schematic...

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Blog entry by waters posted 02-09-2011 04:44 AM 12670 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 2: Finally some progress.... Part 3 of Traffic Light Project series Part 4: Assembly test (video) »

Here is the final (as of this point) wiring on the light controller circuit. I’ll get the power controller for this part added shortly.

This is a really simple circuit with only two IC’s. One is a 555 timer chip that will create a pulse at an interval determined by adjusting a potentiometer (from about 2 a second all the way to about 4 or 5 seconds). This pulse is sent to a 4017 decade counter chip that will cycle outputs after each pulse received. So it basically counts from 1 to 10 and then resets back to 1. What we do with this is set each of the outputs to trigger a transistor and turn on a set of lights. With three lights (red, yellow, green), I chose to cycle through each light 3 times. This leaves me with one output to turn the circuit off. I’ll show how this works on the next schematic post. But for now, you can see that this is a very simple circuit with many other applications. You could even choose to use this to control a two way intersection of lights on say…. a model rail road light.

Traffic Light Controller Circuit
Hopefully this shows up readable, I’m not sure how to post it with a “zoom”. But if anyone happens to want this in the “full size” scan, just shoot me a message with your email. I’ll send it your way.

Until next time! Take care everyone!

-- Dale, Oregon

2 comments so far

View mafe's profile


13188 posts in 4171 days

#1 posted 02-10-2011 09:44 PM

Wonderful project.
best thoughts,

-- MAD F, the fanatical rhykenologist and vintage architect.

View chandel's profile


1 post in 3204 days

#2 posted 08-03-2012 11:35 AM

can you send me all the detail of this project on my email id plz soon as possible.

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