Traffic light simulation with LM555 - "Traffic Lights" installation

Traffic light simulation with LM555 - "Traffic Lights" installation

Reading time: 2 minute

What it is?

Also called "Traffic Lights", the presented montage can be used for certain lighting effects in various applications.

At the core of its operation are two 555 integrated circuits. This toy traffic light makes things fun, while helping children learn traffic safety. The circuit is powered by a direct current source between 9-12V.

List of required components:

1 x Breadboard test board + connecting wires
1 x R1 = 100 kOhm
1 x R2 = 470 Ohms
1 x R3 = 47k
1 x R4 = 220 Ohms
1 x R5 = 220 Ohms
1 x C1 = 100uF
1 x C2 = 100uF
1 x LED1 (red)
1 x LED2 (orange)
1 x LED3 (green)
1 x IC1 = LM555
1 x IC2 = LM555
1 x Terminal contact

How does the assembly work?

Installation should follow lighting sequence presented in the animation below:

For a better understanding of the operation of the circuit and to make this assembly on the breadboard we will need electronic scheme presented below:

Also for this application is available the following video material in which it is presented real operation:


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A comment

  1. Hi, sorry, maybe this is a bad question, but can you tell me, 100 uF capacitors, what voltage should it be? I find all kinds of 100uF capacitors, but I don't know what they should be :).
    Thanks for understanding

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