The Nano 33 BLE Sense board has an inbuilt RGB LED which is connected to pin 22, 23, 24.

This information is available on the Nano 33 BLE’s boards variant file.

#define RED 22     
#define BLUE 24     
#define GREEN 23
#define LED_PWR 25

Below is the general sketch to play around with the RGB led on the Nano 33 BLE boards and user can modify the sketch according to the requirements.

// How to control the RGB Led and Power Led of the Nano 33 BLE boards.  

 #define RED 22     
 #define BLUE 24     
 #define GREEN 23
 #define LED_PWR 25

void setup() {

 // initialize the digital Pin as an output
  pinMode(RED, OUTPUT);
  pinMode(BLUE, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(LED_PWR, OUTPUT);

}

// the loop function runs over and over again
void loop() {
  digitalWrite(RED, LOW); // turn the LED off by making the voltage LOW
  delay(1000);            // wait for a second
  digitalWrite(GREEN, LOW);
  delay(1000);  
  digitalWrite(BLUE, LOW);
  delay(1000);  
  digitalWrite(RED, HIGH); // turn the LED on (HIGH is the voltage level)
  delay(1000);                         
  digitalWrite(GREEN, HIGH);
  delay(1000);  
  digitalWrite(BLUE, HIGH);
  delay(1000);  
  digitalWrite(LED_PWR, HIGH);
  delay(1000);  
  digitalWrite(LED_PWR, LOW);
  delay(1000);  
}