ezLED Library - LED Array Example

This tutorial shows how to use an example of ezLED library that controls multiple LED in an array.

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
3×LED
3×220 ohm resistor
1×Breadboard
2×Jumper Wires
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About LED

About ezLED Library

Wiring Diagram

Arduino multiple LED Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

Arduino Code

Quick Steps

  • Install ezLED library. See How To
  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • On Arduino IDE, Go to File Examples ezLED LEDArray example
/* Created by ArduinoGetStarted.com This example code is in the public domain Tutorial page: https://arduinogetstarted.com/library/led/example/arduino-led-array This example blinks 3 LED: + blink one LED forever + blink one LED in 5 seconds + blink one LED in 10 times + without using delay() function. This is a non-blocking example */ #include <ezLED.h> // ezLED library #define NUM_LED 3 // three LEDs #define PIN_LED_1 7 #define PIN_LED_2 8 #define PIN_LED_3 9 ezLED ledArray[NUM_LED] = { ezLED(PIN_LED_1), // create ezLED object that attach to pin PIN_LED_1 ezLED(PIN_LED_2), // create ezLED object that attach to pin PIN_LED_2 ezLED(PIN_LED_3) // create ezLED object that attach to pin PIN_LED_3 }; void setup() { Serial.begin(9600); ledArray[0].blink(500, 500); // 500ms ON, 500ms OFF, blink immediately ledArray[1].blinkInPeriod(100, 100, 5000); // 100ms ON, 100ms OFF, blink in 5 seconds, blink immediately ledArray[2].blinkNumberOfTimes(250, 750, 10); // 250ms ON, 750ms OFF, repeat 10 times, blink immediately } void loop() { for (int i = 0; i < NUM_LED; i++) ledArray[i].loop(); // MUST call the led.loop() function in loop() // print the operation state for (int i = 0; i < NUM_LED; i++) { Serial.print("LED "); Serial.print(i + 1); if (ledArray[i].getState() == LED_DELAY) Serial.println(" DELAYING"); else if (ledArray[i].getState() == LED_BLINKING) Serial.println(" BLINKING"); else if (ledArray[i].getState() == LED_IDLE) Serial.println(" BLINK ENDED"); } // DO SOMETHING HERE }
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Arduino IDE Upload Code
  • Open Serial Monitor to see result:
  • COM6
    Send
    LED 1 BLINKING LED 2 BLINKING LED 3 BLINKING LED 1 BLINKING LED 2 BLINKING LED 3 BLINKING LED 1 BLINKING LED 2 BLINK ENDED LED 3 BLINKING LED 1 BLINKING LED 2 BLINK ENDED LED 3 BLINKING LED 1 BLINKING LED 2 BLINK ENDED LED 3 BLINKING LED 1 BLINKING LED 2 BLINK ENDED LED 3 BLINKING
    Autoscroll Show timestamp
    Clear output
    9600 baud  
    Newline  

Code Explanation

Read the line-by-line explanation in comment lines of source code!

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