Embedded Systems

 /* RGB LED vs LED
 Circuit
 Connections:
 PIN_12 => LED_Anode - LED_Cathode =>  Resistor 220Ω => Gnd
 PIN_9  => Resistor 220Ω           =>  Red pin of RGB LED
 PIN_11 => Resistor 220Ω           =>  Blue pin of RGB LED
 PIN_10 => Resistor 220Ω           =>  Green pin of RGB LED
*/
#define R_pin 9        //give the name “R_pin” to PIN_9
#define G_pin 11          //give the name “G_pin” to PIN_11
#define B_pin 10          //give the name “B_pin” to PIN_10
#define LED_pin 12        //give
the name “LED_pin” to PIN_12
//The setup() function initializes and sets the initial values
//It will only run once after each powerup or reset
void setup()
{
  //Configures the PIN_9, PIN_10, PIN_11 and PIN_12 to behave as outputs
  pinMode(R_pin, OUTPUT);
  pinMode(G_pin, OUTPUT);
  pinMode(B_pin, OUTPUT);
  pinMode(LED_pin, OUTPUT);
}
 //This function loops consecutively
void loop()
{
 digitalWrite(LED_pin, HIGH); //Write a HIGH value (5V) to digital pin 12 – LED on
 //red color for RGB = > R=255, G=0, B=0
 analogWrite(R_pin, 255); //Write 100% PWM to pin9
 analogWrite(G_pin, 0);     //Write 0% PWM to pin 11
 analogWrite(B_pin, 0);     //Write 0% PWM to pin 10
 delay(1000);               // Wait for 1 second
 //green color for RGB = > R=0, G=255, B=0
 analogWrite(R_pin, 0);     //Write 0% PWM to pin 9
 analogWrite(G_pin, 255);   //Write 100% PWM to pin 11
 analogWrite(B_pin, 0);     //Write 0% PWM to pin 10
 delay(1000);               // Wait for 1 second
 //blue color = > RGB=0,0,255
 analogWrite(R_pin, 0);     //Write 0% PWM to pin 9
 analogWrite(G_pin, 0);     //Write 0% PWM to pin 11
 analogWrite(B_pin, 255);   //Write 100% PWM to pin 10
 delay(1000);               // Wait for 1 second
}