Build a Real Traffic Light Sequence for Model Crossings – 555 Timer & CD4017 Lab Kit

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Imagine a miniature intersection on your desk, where red, yellow, and green LEDs glow in the same automatic sequence you see on real roads — all without a single line of code. This kit brings that model to life using two classic integrated circuits: the 555 timer as a steady clock and the CD4017 decade counter to step through the light pattern. Perfect for school lab experiments, ATL tinkering labs, and science exhibitions, you’ll wire the entire circuit on a half breadboard and watch your own traffic controller work.

What You'll Build

You’ll assemble a fully functional traffic light controller for a model road crossing. The circuit cycles through red, red+yellow, green, yellow, and back to red — exactly like signals on Indian streets. By arranging the LEDs to represent two crossing roads, you create a realistic intersection. The project runs on a 9V battery and demonstrates how digital logic can be built without a microcontroller.

What You'll Learn

• How a 555 timer IC creates a stable clock pulse to drive digital circuits
• The operation of a CD4017 decade counter and how its 10 outputs sequence in order
• Proper wiring of LEDs with current-limiting resistors on a breadboard
• Translating a schematic diagram into a working hardware model

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Designed for ATL Tinkering Lab students, CBSE Class 6-9 science projects, and young makers aged 10-15. Teachers can use it to introduce sequential logic without microcontrollers, while hobbyists get a clean, all‑in‑one package for a classic 555‑4017 circuit. Even first‑year B.Tech ECE students may find it a quick‑to‑build refresher on timer and counter fundamentals.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.