Arduino UNO R3/MEGA 2560 R3 Project 5: LED Chasing Effect

Posted by Fiona Su on March 22, 2020

Introduction

We often see billboards composed of colorful LEDs. They are constantly changing to form various effects. In this experiment, we compile a program to simulate chase effect.

Hardware Required

Arduino Board x1
Led x6
220Ω resistor x6
breadboard jumper wire x 13

Video Tutorial

Connection

Connection for REV4:

Connection for 2560 R3:

Sample Code

int BASE = 2 ;  // the I/O pin for the first LED
int NUM = 6;   // number of LEDs

void setup()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     pinMode(i, OUTPUT);   // set I/O pins as output
   }
}

void loop()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, LOW);    // set I/O pins as “low”, turn off LEDs one by one.
     delay(200);        // delay
   }
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, HIGH);    // set I/O pins as “high”, turn on LEDs one by one
     delay(200);        // delay
   }  
}

Result

You can see the LEDs blink by sequence.

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Tags: arduino starter kit tutorial, arduino uno starter kit tutorial, microbit tutorial