Learning Objective: Master controlling multiple LEDs with Arduino Uno to create exciting light patterns and sequences using arrays, loops, and timing functions.
Introduction to LED Patterns
Moving beyond a single blinking LED, we'll learn to control multiple LEDs to create mesmerizing patterns like running lights, binary counters, and random sparkles!
When working with multiple LEDs, we need efficient ways to manage them. Instead of writing repetitive code for each LED, we'll use:
Arrays
Store multiple pin numbers in one variable
For Loops
Repeat actions for each LED automatically
millis() Timing
Non-blocking timing for smooth patterns
Components Needed
- Arduino Uno1
- LEDs (Red, Yellow, Green, Blue)4
- 220Ω Resistors4
- Breadboard1
- Jumper Wires~10
Circuit Diagram - 4 LED Setup
Below is our complete circuit with 4 LEDs connected to Arduino pins 8, 9, 10, and 11. Each LED has its own 220Ω current-limiting resistor for protection.