Traffic Controller
Build a traffic light that cycles through green, yellow, and red
Watch the circuit build itself: components drop in, wires connect, and the output comes alive.
Components
Everything you need for this project.
1x Red LED
1x Yellow LED
1x Green LED
3x 220Ω resistors
6x jumper wires
How It Works
Sequential logic, timing, and multiple output control. Introduction to state machines through traffic light phases.
What You Build
Three LEDs on pins D1–D3, each through a 220Ω resistor, cycling through a traffic light sequence.
African Context
Traffic management is a growing challenge in rapidly urbanizing African cities like Lagos, Nairobi, and Dar es Salaam. Understanding traffic light logic is the first step toward smart city infrastructure.
What You'll See
LEDs cycle: Green ON for 3 seconds, Yellow for 1 second, Red for 3 seconds, repeat.