Traffic Lights
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I was setting this up in my simulator just the way you have it here. Am I missing something because I do not see how you will ever get a signal on probe 2 which you have comming from output of that 555. In the sim the Led-3 never goes out and the 2,7,8,and 9 cycle. Leds 1,4,5, and 6 never light because you never trigger the 555. You have the output
I believe if you increase the 30k resistor where you have probe 2 set up that will increase the off time of Led 3. Try it and see what happens. Good luck.
I believe if you increase the 30k resistor where you have probe 2 set up that will increase the off time of Led 3. Try it and see what happens. Good luck.
I just put this circuit together on a breadboard tonight, and it works great! I have a real-world stoplight in my game room that currently only lights all 3 bulbs at the same time when you plug it in, and I want to power the switching of the 120VAC bulbs with the circuit. I'm going to use some solid-state relays so I can control the higher AC voltage with low DC voltage. Thanks for posting this circuit and making my project so much easier. I'll post my final product in a week or so when the relays arrive.
A perfect real world application! Can't wait to see how it looks 
Hi Thomas,
Great work! Would you add a nice close up picture of the finished project for others to see. A lot of people like to see the actual wiring along with the schematic to double check their work. I know a few people have had trouble with this project so I think a good high res picture would help.
Regards,
George
Great work! Would you add a nice close up picture of the finished project for others to see. A lot of people like to see the actual wiring along with the schematic to double check their work. I know a few people have had trouble with this project so I think a good high res picture would help.
Regards,
George
Hi all,
I'm finished with the stoplight project, so I posted a couple of videos here. Facebook rotated them, and I rotated them back... so I hope they come out correct. If you have any questions or if you'd like better photos of anything, just let me know!
Thanks to whoever posted the original schematic - you saved me lots to time, and you made my stoplight WAY cooler!
I'm running it at 6vdc from an old phone charger, and the output voltage at each LED (well, each relay in my case) is 2.1vdc. The bulbs in the stoplight are running on 120vac, being switched on and off using solid-state relays where the LEDs are in the schematic. The second video should make it really clear.
I'm finished with the stoplight project, so I posted a couple of videos here. Facebook rotated them, and I rotated them back... so I hope they come out correct. If you have any questions or if you'd like better photos of anything, just let me know!
Thanks to whoever posted the original schematic - you saved me lots to time, and you made my stoplight WAY cooler!
I'm running it at 6vdc from an old phone charger, and the output voltage at each LED (well, each relay in my case) is 2.1vdc. The bulbs in the stoplight are running on 120vac, being switched on and off using solid-state relays where the LEDs are in the schematic. The second video should make it really clear.
This is great for that:
http://freespace.virgin.net/matt.waite/resource/handy/pinouts/555/
http://freespace.virgin.net/matt.waite/resource/handy/pinouts/555/
Daithi, I used the circuit on the website you provided and it seems not to work. I also used the advice you gave at the end of the reply and removed the diode. The yellow light does not cut on and the red and green light just stay on. I used the multisim program. Here is a picture. Please help from anyone
