Explore creative ways to control multiple LEDs using a 3-to-8 multiplexer and Pulse Width Modulation (PWM) with these exciting Arduino-based projects. These examples demonstrate how multiplexing reduces the number of pins needed while enabling dynamic lighting effects. Perfect for both beginners and hobbyists, these projects introduce essential embedded systems concepts like channel selection, PWM, randomness, and LED sequencing.

Each project highlights a unique effect:

  • Brightness Fade: Smoothly dims LEDs in sequence, demonstrating PWM in action.
  • Ping Pong Effect: Creates a back-and-forth light pattern using a multiplexer and PWM.
  • Random LED Burst: Generates an unpredictable light show using Arduino’s random() function.

Together, these projects blend programming, hardware interfacing, and creative design — ideal for learning and experimenting with embedded electronics.

Project 1: Brightness Fade Effect Using Multiplexed LEDs

Description:
This project creates a smooth fading effect across LEDs using a 3-to-8 multiplexer and PWM. The selectChannel() function activates each LED one at a time, gradually dimming it using analog output. A great starting point to learn about multiplexing and light intensity control with Arduino.

Arduino LED fading, PWM with multiplexer, Arduino brightness control, smooth LED transitions, multiplexed dimming tutorial.

Project 2: Ping Pong LED Effect with Arduino

Description:
This project creates a ping pong-style light effect where LEDs light up in a sequence from left to right and back again. A 3-to-8 multiplexer is used to control the LEDs, and PWM keeps the brightness consistent. Perfect for learning how to create patterns and animations with a limited number of Arduino pins.

Arduino ping pong lights, LED bouncing effect, sequential LED control with multiplexer, Arduino lighting animation.

Project 3: Random LED Burst Effect Using Arduino

Code:

Description:
This fun and unpredictable project lights up LEDs in random order using the random() function. With a 3-to-8 multiplexer, only a few pins are needed to control many LEDs. It’s a fantastic way to explore randomness in embedded systems and create visually dynamic lighting effects.

Arduino random LED effect, LED burst with Arduino, random number generation, multiplexed lighting control, embedded randomness.

Schematic:

Schematic

Connections:

Connections