Lesson 58 : What is multidimensional Array? Example of RGB LED

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

Part 6: Arduino Practial Programming

In this lesson we learn about multidimensional array. Regular array is single dimension which is list of values in one variable. But when you have related values like lenght and width of objects, then we can define two dimensional array to hold lenght and width for the same object in the same index. This allows to have dimensions for example of items in a multidimensional array.
If we want for example to meausre voltage and current at different intervals of time we can use a two dimensional array. or we can use a three dimensional array two assign values of color red, green and blue for RGB LED. In the next lession we practially use it with RGB LED. Please watch the video for full details.

00:00 Introduction to multidimensional array
04:25 Reading value of a multidimensional array (this code)
05:50 Updating value of a multidimensional array
08:57 Defining 3 dimensional array
10:29 Dreading 3 dimensional array values
11:37 Updating 3 dimensional array values
12:39 Defining empty 3 dimensional array


  /*
 * Lesson 58: What is multidimensional Array? RGB LED example
  
  
  * Works for both Common Anode and Common Cathode RGB LEDs
 * This Arduino sktech is to control color on REG LED
 
 Please watch full detailed video: https://youtu.be/YuGJpFeoq5I
 Location of this code: https://robojax.com/course1/?vid=lecture59
 
 * Written by Ahmad Shamshiri for Robojax.com 
 * on October 06th 2018 at 14:00 in Ajax, Ontario, Canada

 
   
If you found this tutorial helpful, please support me so I can continue creating 
content like this. You can support me on Patreon http://robojax.com/L/?id=63

or make donation using PayPal http://robojax.com/L/?id=64

 *  * 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/>.
 */
int RED = 11;// the PWM pin the RED LED is attached to
int GREEN = 10;// the PWM pin the GREEN LED is attached to
int BLUE = 9;// the PWM pin the BLUE LED is attached to
int colorTime = 2000; // time to wait between color change
int type =1; // 0 for common cathode LED
             // 1 for common anode LED


int color[8][3] =
              {
               {255,255,255},// white
               {255,0,    0},// red
               {0,  255,  0},// green
               {0, 0,   255},// blue
               {255,255,  0},// yellow
               {0,  255,255},// a qua
               {255,0,  255},// pink
               {255,125,  0},//Orange
              };
String colorName[8]=
              {
               "White",
               "Red",
               "Green",
               "Blue",
               "Yellow",
               "Aqua",
               "Pink",
               "Orange"
              };
void setup() {
   // Robojax.com RGB LED code 20181006
  Serial.begin(9600);
  // declare pin 11,12, 13 for RED , GREEN and BLUE to be an output:
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);

}

// the loop routine runs over and over again forever:
void loop() {

  // Robojax.com RGB LED code 20181006
  

  delay(3000);
    for(int j=0; j<8; j++)
      {
        RGB_LED(color[j][0], color[j][1], color[j][2]);
        Serial.println(colorName[j]);
              
      delay(colorTime);// delay for each color
      }
 
}

/*
  sends correct value to R, G and B and LED pin
  this funciton is for commond Cathode LEDs and converts regular PWM 
  @param r is received red value
  @param g is received green value
  @param b is received blue value
  
 */
void RGB_LED(int r, int g, int b)
{
  if(type == 1)
  {
    r = 255-r;
    g = 255-g;
    b = 255-b;
  }
        analogWrite(RED, r);// set value for RED LED        
        analogWrite(GREEN, g);// set value for GREEN LED          
        analogWrite(BLUE, b);// set value for BLUE LED    
                      
}