ezLED Library - Multiple LED Example

This tutorial shows how to use an example of ezLED library that controls multiple LEDs

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
3×LED
3×220 ohm resistor
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Optional) Screw Terminal Block Shield for Arduino

One of the following breadboard:

1×Full-sized 830-Point Breadboard
1×Half-sized 400-point Breadboard
1×Mini-sized 170-point Breadboard
1×All-sized Breadboard Kit
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About LED

About ezLED Library

Wiring Diagram

Arduino multiple LED Wiring Diagram

This image is created 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 MultipleLED example
/* Created by ArduinoGetStarted.com This example code is in the public domain Tutorial page: https://arduinogetstarted.com/library/led/example/arduino-multiple-led This example blinks 3 LED: + with different blink time + 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 PIN_LED_1 7 #define PIN_LED_2 8 #define PIN_LED_3 9 ezLED led1(PIN_LED_1); // create ezLED object that attach to pin PIN_LED_1 ezLED led2(PIN_LED_2); // create ezLED object that attach to pin PIN_LED_2 ezLED led3(PIN_LED_3); // create ezLED object that attach to pin PIN_LED_3 void setup() { Serial.begin(9600); led1.blink(500, 500); // 500ms ON, 500ms OFF, blink immediately led2.blinkInPeriod(100, 100, 5000); // 100ms ON, 100ms OFF, blink in 5 seconds, blink immediately led3.blinkNumberOfTimes(250, 750, 10); // 250ms ON, 750ms OFF, repeat 10 times, blink immediately } void loop() { led1.loop(); // MUST call the led1.loop() function in loop() led2.loop(); // MUST call the led2.loop() function in loop() led3.loop(); // MUST call the led3.loop() function in loop() Serial.print("LED 1"); printState(led1.getState()); Serial.print("LED 2"); printState(led2.getState()); Serial.print("LED 3"); printState(led3.getState()); // DO SOMETHING HERE } void printState(int state) { if (state == LED_DELAY) Serial.println(" DELAYING"); else if (state == LED_BLINKING) Serial.println(" BLINKING"); else if (state == LED_IDLE) Serial.println(" BLINK ENDED"); }
  • 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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