Hi, am kind of new to this forum, pleas take it easy on me and help me out. I am required to build a traffic light using LEDs as my school project. the timing sequence required is 6o seconds for Red, 55 sec into the time Yellow come up and glow along side with the RED for about 5 seconds, then goes of for the Green to come up for like 60 seconds and 55 seconds into the time the Yellow comes up again and glow along side with the Green then give way for the Red to come up just like the normal traffic light.
I've tried building two different circuit configuration using 555 timer and a decade counter but could not achieve the rquired result.
I've also tried using series of capacitors and variable resistors in adjusting the timing frequencies still could not give me the exact result.
The power supply unit I've built, produces 12V regulated DC, Using 220V to 12V transformer.
I'll appreciate every effort towards helping me get the required result.
Please, also provide circuit diagram to help understand the connections.
Thanx,
Hudson