Virtual IoT Lab DEI

Instructions

Objective:

Learn how to control an RGB LED to display different colors using Arduino PWM (Pulse Width Modulation) outputs.

Steps to Perform:

Click "Start Simulation" to power up the Arduino circuit
The RGB LED will automatically cycle through 8 different colors
Each color displays for 1 second before changing
Color sequence: Red → Green → Blue → Raspberry → Cyan → Magenta → Yellow → White
The color cycle repeats continuously

Key Concepts:

RGB LED: LED with Red, Green, and Blue elements that mix to create colors
PWM Control: Uses analogWrite() to control LED brightness (0-255)
Pin Configuration: Red on pin 11, Green on pin 10, Blue on pin 9
Color Mixing: Combine different intensities of R, G, B to create any color
RGB_color() Function: Custom function sets color by controlling all three pins
Primary Colors: Red (255,0,0), Green (0,255,0), Blue (0,0,255)
Secondary Colors: Cyan (0,255,255), Magenta (255,0,255), Yellow (255,255,0)

Arduino Code - main.ino

            /* 
    Interfacing of RGB Led with Arduino.
*/
int red_light_pin= 11;
int green_light_pin = 10;
int blue_light_pin = 9;

void setup() {
  pinMode(red_light_pin, OUTPUT);
  pinMode(green_light_pin, OUTPUT);
  pinMode(blue_light_pin, OUTPUT);
}

void loop() {
  RGB_color(255, 0, 0); // Red
  delay(1000);
  RGB_color(0, 255, 0); // Green
  delay(1000);
  RGB_color(0, 0, 255); // Blue
  delay(1000);
  RGB_color(255, 255, 125); // Raspberry
  delay(1000);
  RGB_color(0, 255, 255); // Cyan
  delay(1000);
  RGB_color(255, 0, 255); // Magenta
  delay(1000);
  RGB_color(255, 255, 0); // Yellow
  delay(1000);
  RGB_color(255, 255, 255); // White
  delay(1000);
}

void RGB_color(int red_light_value, int green_light_value, int blue_light_value)
 {
  analogWrite(red_light_pin, red_light_value);
  analogWrite(green_light_pin, green_light_value);
  analogWrite(blue_light_pin, blue_light_value);
}
            
          