int red_light_pin= 9;
  int green_light_pin= 10;
  int blue_light_pin= 11;
  int sensorPin = A0;
void setup() {
  pinMode(red_light_pin, OUTPUT);
  pinMode(green_light_pin, OUTPUT);
  pinMode(blue_light_pin, OUTPUT);// put your setup code here, to run once:
  pinMode(sensorPin, INPUT);
}

void loop() {
  int analog_val = analogRead(sensorPin);
  int blue_light_value = map(analog_val, 0, 1023, 0, 255);
  RGB_color(50, 50, blue_light_value);
  
}

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);
}