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

Please select other codes for this lecture from the links below.

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 4 code. This code will turn the LED ON or OFF with fading value.So the LED will get brighter slowly and will turn OFF slowly fading out.

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  https://robojax.com/course1/?vid=lecture98
 * Project 4 of 10
 * 
 *  This code will turn the LED ON or OFF with fading value. 
 * So the LED will get brighter slowly and will turn OFF slowly fading out.
 
 * Watch full details and demonstraiton: https://youtu.be/OSwleCBlkuI
 * 
 * Start a full Arduino Step By Step course:  https://youtu.be/-6qSrDUA5a8
 * 
 ****** 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 pars 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: https://youtu.be/-6qSrDUA5a8

  * Tutorial created Ahmad Shamshiri on Feb 01, 2022
 * in Ajax, Ontario, Canada
 * www.Robojax.com

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 https://bit.ly/donate-robojax
  
 * 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 Robojax.com
    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
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    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 <https://www.gnu.org/licenses/>.
    
  The analogWrite() function uses PWM, so if you want to change the pin you're
  using, be sure to use another PWM capable pin. On most Arduino, the PWM pins
  are identified with a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11.

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Fade
 * 
 */
int led = 3;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 3;    // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  // set the brightness of pin 9:
  analogWrite(led, brightness);

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  // wait for 30 milliseconds to see the dimming effect
  delay(30);
}