Arduino Traffic Light with Pedestrian Button

Overview

A first multi-LED project with a state machine and a button interrupt.

Build Steps

1. 1

   Wire three LEDs

   Each LED goes through its own 220 Ω resistor to a digital pin.

2. 2

   Add the button

   Wire a tactile button to ground with INPUT_PULLUP.

3. 3

   Write the cycle

   Cycle green, yellow, red using millis(); a button press shortens the green phase.