#define RED_PIN 26     // GPIO 26
#define GREEN_PIN 25   // GPIO 25
#define BLUE_PIN 4    // GPIO 4

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  // initialize the LED pins as output
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT); 
  pinMode(BLUE_PIN, OUTPUT);  
}

void setRGBColour(int redValue, int greenValue, int blueValue) {
  // analogWrite() automatically constrains these values to 8 bits
  // set the LED colors for an RGB LED with a common anode
  // invert value since it's common anode
  analogWrite(RED_PIN, 255 - redValue); 
  analogWrite(GREEN_PIN, 255 - greenValue); 
  analogWrite(BLUE_PIN, 255 - blueValue);
}
void loop() {
  
  // blue light
  analogWrite(RED_PIN, 255);
  analogWrite(GREEN_PIN, 255);
  analogWrite(BLUE_PIN, 0);
  delay(1000);
  
  // generate random values between 0 and 255 for each color
  int redValue = random(0, 256); 
  int greenValue = random(0, 256);
  int blueValue = random(0, 256);

  setRGBColour(redValue, greenValue, blueValue);

  delay(1000); // wait one second before changing the colour
}