// Define pins for RGB LED
const int redPin = 11;
const int greenPin = 10;
const int bluePin = 9;

const int dt = 500;    // Small delay before the next input

void setup() {
  // Set RGB LED pins as output
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  Serial.begin(9600); // Start serial communication
}

void loop() {
  Serial.println("Enter a color (r = Red, g = Green, b = Blue, c = Cyan, m = Magenta, y = Yellow): ");
  
  while (!Serial.available()); // Wait for user input

  String input = Serial.readStringUntil('\n'); // Read the full input line
  input.trim(); // Remove any extra whitespace, newline or carriage return

  char color = input.charAt(0); // Extract the first character

  // Set the LED color based on user input
  switch (color) {
    case 'r': setColor(255, 0, 0); break;    // Red
    case 'g': setColor(0, 255, 0); break;    // Green
    case 'b': setColor(0, 0, 255); break;    // Blue
    case 'c': setColor(0, 255, 255); break;  // Cyan
    case 'm': setColor(255, 0, 255); break;  // Magenta
    case 'y': setColor(255, 255, 0); break;  // Yellow
    default: Serial.println("Invalid color."); break;
  }

  delay(dt); // Small delay before the next input
}

// Function to set RGB LED color
void setColor(int redValue, int greenValue, int blueValue) {
  analogWrite(redPin, redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin, blueValue);
}