How to interface Arduino uno with A Multiplexer

This collection of Arduino-based projects demonstrates creative ways to control multiple LEDs using a 3-to-8 multiplexer and pulse-width modulation (PWM). These projects showcase how multiplexing can significantly reduce the number of required microcontroller pins while enabling advanced lighting effects. Whether you're a beginner or an enthusiast, these projects are an excellent way to explore key embedded systems concepts such as channel selection, random number generation, PWM, and dynamic LED control.

Each project emphasizes a unique lighting effect:

• Brightness Decrease Effect: Smoothly dims LEDs in sequence, offering insights into PWM control and gradual transitions.
• Ping Pong Effect: Creates a dynamic bouncing light pattern, perfect for sequential lighting animations.
• Random LED Burst: Produces a lively and unpredictable lighting effect using random number generation.

These projects combine programming, hardware interfacing, and creative design, making them ideal for learning and experimentation in embedded electronics.

Project 1: Brightness Decrease Effect Using Multiplexed LEDs

Description:
This project demonstrates a smooth brightness decrease effect on LEDs connected to a 3-to-8 multiplexer. By using Arduino's PWM capabilities, LEDs are dimmed gradually from full brightness to off. The selectChannel function dynamically controls the multiplexer channels, allowing precise LED control. This project is ideal for learning LED control, multiplexing, and PWM signals in embedded systems.

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Project 2: Ping Pong LED Effect with Arduino and Multiplexer

Description:
Create a visually captivating ping pong LED effect using a 3-to-8 multiplexer. This Arduino-based project lights up LEDs in a sequence that moves forward and then reverses. The selectChannel function is utilized to switch LEDs dynamically, while PWM ensures consistent brightness. Perfect for those exploring sequential lighting and multiplexer usage in embedded projects.

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Project 3: Random LED Burst Effect Using Arduino

Description:
Add randomness to your LED project with this Random LED Burst Effect. Using a 3-to-8 multiplexer, LEDs are lit up in a random sequence, creating a lively and unpredictable visual display. The random() function ensures that no two bursts look the same. This project is great for exploring random number generation, multiplexing, and dynamic lighting effects with Arduino.

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Schematic:

Connections:

#include <Arduino.h>

#define A 2

#define B 3

#define C 4

#define PWM_PIN 9

#define INH 5

void setup() {

  pinMode(A, OUTPUT);

  pinMode(B, OUTPUT);

  pinMode(C, OUTPUT);

  pinMode(INH, OUTPUT);

  digitalWrite(INH, LOW); // Enable multiplexer

  pinMode(PWM_PIN, OUTPUT);

  Serial.begin(9600);

}

void loop() {// only this part will change

}

void selectChannel(int channel) {

  digitalWrite(A, channel & 0x01);

  digitalWrite(B, (channel >> 1) & 0x01);

  digitalWrite(C, (channel >> 2) & 0x01);

}

// Brightness decrease

//void loop() {

  //for (int i = 0; i < 8; i++) {

    //selectChannel(i);

    //for (int brightness = 255; brightness >= 0; brightness -= 5) {

    //  analogWrite(PWM_PIN, brightness);

    //  delay(20);

   // }

  //}

//}

//pingpong effect

//void loop() {

  //for (int i = 0; i < 8; i++) {

    //selectChannel(i);

    //analogWrite(PWM_PIN, 255);

    //delay(100);

    //analogWrite(PWM_PIN, 0);

  //}

  //for (int i = 6; i >= 0; i--) {

    //selectChannel(i);

    //analogWrite(PWM_PIN, 255);

    //delay(100);

    //analogWrite(PWM_PIN, 0);

  //}

//}

//Random LED burst

//void loop() {

  //for (int i = 0; i < 10; i++) {

    //int randomLED = random(0, 8);

    //selectChannel(randomLED);

    //analogWrite(PWM_PIN, 255);

    //delay(100);

    //analogWrite(PWM_PIN, 0);

  //}

  //delay(1000);

//}