ezLED Library - LED On Off Example

This tutorial shows how to use an example of ezLED library that turns on/off a LED based on the state of a button.

Hardware Required

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

About ezLED Library

Wiring Diagram

Arduino LED Library 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 LEDOnOff example
/* Created by ArduinoGetStarted.com This example code is in the public domain Tutorial page: https://arduinogetstarted.com/library/led/example/arduino-led-on-off This example turn ON/OFF led according to state of button. */ #include <ezLED.h> // ezLED library #define BUTTON_PIN 7 ezLED led(3); // create a LED object that attach to pin 3 void setup() { Serial.begin(9600); pinMode(BUTTON_PIN, INPUT_PULLUP); } void loop() { led.loop(); // MUST call the led.loop() function in loop() int buttonState = digitalRead(BUTTON_PIN); if (buttonState == LOW) { led.turnON(); // turn on immediately //led.turnON(1000); // turn on after 1 second } else { led.turnOFF(); // turn off immediately //led.turnOFF(1000); // turn off after 1 second } if (led.getOnOff() == LED_ON) Serial.println("LED is ON"); else Serial.println("LED is OFF"); }
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Arduino IDE Upload Code
  • Open Serial Monitor to see result:
  • COM6
    Send
    LED is OFF LED is OFF LED is OFF LED is OFF LED is OFF LED is ON LED is ON LED is ON LED is ON
    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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