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Lesson 98: Arduino 10 LED Push button Projects, Potentiometer LED Voltmeter and Traffic Light

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Part 1: Introduction

In this lesson we learn how to use LED and Push button in this 10 LED projects. Wiring diagram is shown, code is fully explained and demonstrated with multiple change of settings for each project. We read potentiometer's voltage and display voltage by turning each LED on to represent voltages. A Simple traffic light project.
This code is part of video lecture. This project 1 code basic LED ON/OFF.

  • 1:16 LED and resistor calculation
  • 05:52 Projec 1 LED ON OFF
  • 12:41 Projec 2 LED ON/OFF with push button
  • 17:12 Projec 3 LED ON/OFF toggle with push button
  • 20:10 Projec 4 Fading light of LED
  • 23:17 Projec 5 Fading light of LED using push button
  • 27:30 Projec 6 See Saw with LED using Arduino
  • 30:44 Projec 7 Walking Light Using Arduino
  • 36:38 Projec 8 Walking light with push button using Arduino
  • 42:21 Projec 9, 5 LED voltage level meter using Arduino
  • 49:21 Projec 10 Arduino Traffic Light

 * Arduino Step by Step Course by Robojax
 * Lesson 98
 * Project 1 of 10
 * This code will turn ON and OFF an LED . 
 * the time the LED is ON or OFF is set in the code
 * Watch full details and demonstraiton:
 * Start a full Arduino Step By Step course:
 ****** 10 Projects explained in this video
 * 1-LED ON OFF 
 * 2-LED ON/OFF with push button
 * 3-LED ON/OFF toggle with push button
 * 4-Fading light of LED
 * 5-Fading light of LED using push button
 * 6-See Saw with LED
 * 7-Walking Light
 * 8-Walking light with push button
 * 9-LED voltage level meter
 * 10- Arduino Traffic Light
 * What parts we need:
 * -Of course Arduino board (UNO , Nano, Mega or any)
 * -Push button switch 
 * -LED eitehr 5mm or 3mm
 * -200ohm to 1000 ohrm resistor for LED
 * -Some dupont wires to connec 
 * -If don't want to solder, then use breadboard
This video is part of Arduino Step by Step Course which starts here:

  * written by Ahmad Shamshiri on Jan 30, 2022
 * in Ajax, Ontario, Canada

If you found this tutorial helpful, please support me so I can continue creating 
content like this. Make a donation using PayPal by credit card
 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <>.


const int LEDPin = 3;//define a pin that is connected to LED

const int ON_TIME = 2000;
const int OFF_TIME = 500;

void setup() {
  pinMode(LEDPin, OUTPUT);//define a pin for LED
  digitalWrite(LEDPin, LOW);

  Serial.begin(9600);//initialize the serial monitor
  Serial.println("Robojax LED ON OFF");//print this text on Serial Monitor


void loop() {
  digitalWrite(LEDPin, HIGH);
     Serial.println("Light ON");

  digitalWrite(LEDPin, LOW);
     Serial.println("Light OFF");

// Watch full details and demonstraiton:

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