예술
뷰티 및 웰니스
공예
문화 및 역사
엔터테인먼트
환경
음식 및 음료
역공학
과학
스포츠
기술
웨어러블
Driving Multiple LEDs — SIK Circuit 4
Ed

작성자

Ed

17. 3월 2026FI
89
0
0
0
0

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.

안내

1

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

이 단계의 재료:

SparkFun Inventor's Kit - V3.2SparkFun Inventor's Kit - V3.21 키트

필요한 도구:

Computer with Arduino IDEComputer with Arduino IDE
2

Hardware Hookup

Wiring Instructions

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

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

이 단계의 재료:

BreadboardBreadboard1 개
Jumper WiresJumper Wires9 개
3

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);
}

이 단계의 재료:

Arduino Uno R3Arduino Uno R31 개

필요한 도구:

Computer with Arduino IDEComputer with Arduino IDE
4

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.

재료

6

필요 도구

1
예상 총액
만든 사람이 산 것. 가격이 없는 재료는 구매하는 곳에서 구하면 됩니다.
₩1,471

CC0 퍼블릭 도메인

이 블루프린트는 CC0로 공개되었습니다. 어떤 목적으로든 자유롭게 복사, 수정, 배포 및 사용할 수 있습니다.

제품 구매를 통해 메이커를 지원하세요. 판매자가 설정한 메이커 커미션 을 받거나, 이 블루프린트의 새로운 반복을 만들어 연결로 포함시킬 수 있습니다.

토론

(0)

로그인 하여 토론에 참여하세요

댓글 로딩 중...