Traffic Lights

[Admin]

This thread is for the discussion of the Traffic Lights circuit.

 

[jesse]

hey i tried making a traffic light using the circuit above and it hasn't worked yet

 

[Justin]

hey i tried making a traffic light using the circuit above and it hasn't worked yet

Can you provide images so we can troubleshoot?

 

[Rafael]

hey i tried making a traffic light using the circuit above and it hasn't worked yet

Add and 100k resistor between pin 2 and 4 on the second 555 and it will work...try on and let me know if worked!!:>)

 

[Rafael]

hey i tried making a traffic light using the circuit above and it hasn't worked yet

Check out too Jesse..mine worked fine..just after figuring out i should have place a resistor between pin 2 and 4 on the 2nd 555...maybe i ll need to change the values of the resitors..im not remebering right night but tomorrow i ll post if u'd like...:>)

 

[James Foster]

The circuit has given erratic results both on breadboard and after soldering.
It went well once only.
Now green, orange and red light in sequence but orange starts to glow while red is still lit.
How can I fix this?

 

[Justin]

The circuit has given erratic results both on breadboard and after soldering.
It went well once only.
Now green, orange and red light in sequence but orange starts to glow while red is still lit.
How can I fix this?

Could you show us pictures of what you have? It's hard to help you when we can't see it.

 

[Steve85]

I've wired the circuit exactly as it's shown in the diagram (well, I can't see any errors), however only my green and red LED's flash. Any ideas why my orange LED isn't coming on? I've tried swapping LED's and there's definitely not a problem with the orange LED. I've also tried putting a 100k resistor between 2 and 4 on the 2nd 555 as mentioned above, but that didn't do anything.

Any help would be much appreciated.

 

[Fleck]

I often build circuits that don't work at first so I know exactly how you feel.You've just got to check and re-check all the connections (and tracks if you're using veroboard)
After that if you don't find anything it's possible the diagram is a dud, so Google for alternatives.

Rich

 

[Rafael]

I've wired the circuit exactly as it's shown in the diagram (well, I can't see any errors), however only my green and red LED's flash. Any ideas why my orange LED isn't coming on? I've tried swapping LED's and there's definitely not a problem with the orange LED. I've also tried putting a 100k resistor between 2 and 4 on the 2nd 555 as mentioned above, but that didn't do anything.

Any help would be much appreciated.

I ll post a new circuit i find out on internet. It is pretty cool coz it goes on 2 ways. When i get home from work i ll do it. Best wishes.

 

[Rafael]

I've wired the circuit exactly as it's shown in the diagram (well, I can't see any errors), however only my green and red LED's flash. Any ideas why my orange LED isn't coming on? I've tried swapping LED's and there's definitely not a problem with the orange LED. I've also tried putting a 100k resistor between 2 and 4 on the 2nd 555 as mentioned above, but that didn't do anything.

Any help would be much appreciated.

As i promise, here are 2 options u can try out to see if it Works for u. 1st one gives u a one way . 2nd one u can analyse and build a 2 way traffic light. Follow the link and see if also Works for u. http://www.josepino.com/light/traffic_light1
On ur that u trying to troublesh0ot u can also try to change the voltage to see if something happens.
Anything let me know!!!

Best Wishes

 

[Daithi]

If you cannot get this circuit to work properly try this one --> (http://rookieelectronics.com/sequential-traffic-lights/)... This circuit is setup to replicate the UK system - remove the diode between pin 10 of the 4017 and the yellow LED and it should work just fine..

 

[Daithi]

I did some playing around today with my new soldering iron (it has been many - many years since I did any soldering)... This is what I ended up with working on the Traffic Lights circuit...

 

[Justin]

Very cool, but the switch from yellow to red is a little fast. Actually all the changes seem a little fast. Still very cool though! Nice job on the build.

 

[Daithi]

Very cool, but the switch from yellow to red is a little fast. Actually all the changes seem a little fast. Still very cool though! Nice job on the build.

Yes Justin, they do run through the pattern a bit fast... I can slow them down with the variable resistor I have in the circuit now... As is this circuit is built to have the green and red stay on for about the same length of time while the yellow is on for about a quarter of that time... Using a higher value variable resistor and adding a small cap in series with the yellow would probably equalize the timing and give the entire circuit a closer run-through time compared to the 1:1 version... What about it folks, would that work?

 

[Justin]

Increasing the values would most likely work but the question is... By how much?

 

[Daithi]

I would have to do the math, but you are right - it is possible...

 

[Tempah]

Hi there! I´m new at the forum and I hope to help as much as I can
Now I´m working with this circuit but I have a problem, the first 555 doesn´t change his state, so the first capacitor can´t proceed to the charge/discharge process and the red LED never turns off. I´m working with Proteus (isis).
Any suggestions?
Thanks!

 

[George]

Have you checked to make sure the caps are installed the correct way? Have you checked you first 555 to ensure it is good?

 

[George]

Can you post a picture of your project so we can see