Driving Multiple LEDs — SIK Circuit 4

Make eight LEDs dance! Learn about arrays, for loops, and multiple output patterns including chase, ping-pong, marquee, and random blink effects.

Arahan

Parts & Introduction

This experiment uses 8 LEDs to create light patterns. You'll learn about arrays (grouping related variables) and for loops (repeating actions efficiently). The sketch includes 6 different animation functions you can try.

Parts Needed

1x Arduino Uno + USB cable
1x Breadboard
8x LEDs (any color)
8x 330Ω Resistors
9x Jumper Wires

Hardware Hookup

Wiring Instructions

Place 8 LEDs in a row on the breadboard.
For each LED, connect the negative leg (shorter) through a 330Ω resistor to GND.
Connect the positive leg (longer) of each LED to Arduino digital pins 2 through 9 (LED 1 = pin 2, LED 2 = pin 3, etc.).
Connect the GND rail on the breadboard to Arduino GND.

Tip: Keep the LEDs neatly spaced for the best visual effect.

Arduino Code

Open the Arduino IDE and upload the following sketch to your Arduino board.

multiple_leds.inoarduino

/*
SparkFun Inventor's Kit
Example sketch 04 — MULTIPLE LEDs

Make eight LEDs dance. Dance LEDs, dance!

Hardware connections:
  8 LEDs with 330 ohm resistors on pins 2-9.
  Negative sides through resistors to GND.

This code is completely free for any use.
*/

int ledPins[] = {2,3,4,5,6,7,8,9};

void setup()
{
  int index;
  for(index = 0; index <= 7; index++)
  {
    pinMode(ledPins[index], OUTPUT);
  }
}

void loop()
{
  oneAfterAnotherNoLoop();

  //oneAfterAnotherLoop();
  //oneOnAtATime();
  //pingPong();
  //marquee();
  //randomLED();
}

void oneAfterAnotherNoLoop()
{
  int delayTime = 100;

  digitalWrite(ledPins[0], HIGH); delay(delayTime);
  digitalWrite(ledPins[1], HIGH); delay(delayTime);
  digitalWrite(ledPins[2], HIGH); delay(delayTime);
  digitalWrite(ledPins[3], HIGH); delay(delayTime);
  digitalWrite(ledPins[4], HIGH); delay(delayTime);
  digitalWrite(ledPins[5], HIGH); delay(delayTime);
  digitalWrite(ledPins[6], HIGH); delay(delayTime);
  digitalWrite(ledPins[7], HIGH); delay(delayTime);

  digitalWrite(ledPins[7], LOW); delay(delayTime);
  digitalWrite(ledPins[6], LOW); delay(delayTime);
  digitalWrite(ledPins[5], LOW); delay(delayTime);
  digitalWrite(ledPins[4], LOW); delay(delayTime);
  digitalWrite(ledPins[3], LOW); delay(delayTime);
  digitalWrite(ledPins[2], LOW); delay(delayTime);
  digitalWrite(ledPins[1], LOW); delay(delayTime);
  digitalWrite(ledPins[0], LOW); delay(delayTime);
}

void oneAfterAnotherLoop()
{
  int index;
  int delayTime = 100;

  for(index = 0; index <= 7; index++)
  {
    digitalWrite(ledPins[index], HIGH);
    delay(delayTime);
  }
  for(index = 7; index >= 0; index--)
  {
    digitalWrite(ledPins[index], LOW);
    delay(delayTime);
  }
}

void oneOnAtATime()
{
  int index;
  int delayTime = 100;

  for(index = 0; index <= 7; index++)
  {
    digitalWrite(ledPins[index], HIGH);
    delay(delayTime);
    digitalWrite(ledPins[index], LOW);
  }
}

void pingPong()
{
  int index;
  int delayTime = 100;

  for(index = 0; index <= 7; index++)
  {
    digitalWrite(ledPins[index], HIGH);
    delay(delayTime);
    digitalWrite(ledPins[index], LOW);
  }
  for(index = 7; index >= 0; index--)
  {
    digitalWrite(ledPins[index], HIGH);
    delay(delayTime);
    digitalWrite(ledPins[index], LOW);
  }
}

void marquee()
{
  int index;
  int delayTime = 200;

  for(index = 0; index <= 3; index++)
  {
    digitalWrite(ledPins[index], HIGH);
    digitalWrite(ledPins[index+4], HIGH);
    delay(delayTime);
    digitalWrite(ledPins[index], LOW);
    digitalWrite(ledPins[index+4], LOW);
  }
}

void randomLED()
{
  int index;
  int delayTime = 100;

  index = random(8);
  digitalWrite(ledPins[index], HIGH);
  delay(delayTime);
  digitalWrite(ledPins[index], LOW);
}

Test & Experiment

What You Should See

All 8 LEDs light up one after another, then turn off in reverse order. This repeats continuously.

Troubleshooting

Some LEDs don't light: Easy to insert an LED backwards. Check polarity.
Out of sequence: With 8 wires, it's easy to cross a couple. Verify LED 1 is on pin 2, then each pin in order.
Starting fresh: Sometimes pulling everything out and re-wiring is faster than debugging.

Experiments to Try

Uncomment the other functions in loop() to try: oneOnAtATime(), pingPong(), marquee(), randomLED().
Create your own animation pattern!
Modify the delay times to change the speed.

Bahan

•SparkFun Inventor's Kit - V3.2 - 1 kitNOK 999.20
Lihat
•Arduino Uno R3 - 1 piecePemegang Tempat
Lihat
•Breadboard - 1 piecePemegang Tempat
Lihat
•5mm LED - 8 piecessPemegang Tempat
Lihat
•330 Ohm Resistor - 8 piecessNOK 24.00
Lihat
•Jumper Wires - 9 piecessNOK 39.20
Lihat

Alatan Diperlukan

Computer with Arduino IDE

CC0 Domain Awam

Blueprint ini dikeluarkan di bawah CC0. Anda bebas menyalin, mengubah, mengedar, dan menggunakan karya ini untuk sebarang tujuan, tanpa meminta kebenaran.

Sokong Pembuat dengan membeli produk melalui Blueprint mereka di mana mereka memperoleh Komisen Pembuat ditetapkan oleh Penjual, atau cipta iterasi baru Blueprint ini dan sertakan ia sebagai sambungan dalam Blueprint anda sendiri untuk berkongsi hasil.

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