Lesson 62: Time control without delay, LED blink with millis()

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

Part 6: Arduino Practial Programming

In this lesson we learn about millis() function a different way to add delay or determain time without halting other processes. We measure the time interval of pressing a push button switch. This is example 2. Please watch the video for full details.

Millis reference page

00:00 Introduction
04:41 millis() example one
07:14 millis() example two
11:12 millis(0 example three
16:11 LED blink using millis
17:08 Wiring for LED explained
18:06 Code explained
22:36 LED blink demonstration


 /*
 * Lesson 62: Time control without delay, LED blink with millis() | Arduino Step By Step Course
 * Example-2 
 * Written by Ahmad Shamshiri on July 27, 2019
 * in Ajax, Ontario, Canada
 * Watch video instruction for millis() : https://youtu.be/obBX9hyH5mM
  This video is part of Arduino Step by Step Course which starts here: https://youtu.be/-6qSrDUA5a8

 

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 *  * 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/>.
 */


unsigned long event = 5000;// 5 seconds
unsigned long buttonPushed =0;

void setup() {
  Serial.begin(9600);//initialize serial monitor
  Serial.println("Introduction to millis");
  pinMode(2,INPUT_PULLUP);
  


}

void loop() {
  // Robojax.com example-2 millis()
  Serial.println(millis());
  int pb = digitalRead(2);// read pin 2
  if(pb ==LOW && buttonPushed ==0)
  {
    buttonPushed =millis();
    Serial.print("First push at:");
    Serial.println(buttonPushed);
  }
  if( pb ==LOW &&  buttonPushed >0 )
  {
   unsigned long difference = millis()- buttonPushed;
      if( difference >= event)
      {
        Serial.println("Action after 5 seconds of first push");
      }
  }
  
}