serial_colors.ino - experimental arduino sketch to read 3 rgb bytes input and write to 3 pins for an rgb led

serial_colors.ino

const int redPin = 9;
const int greenPin = 10;
const int bluePin = 11;

bool firstInputReceived = false;

void setup() {
  Serial.begin(9600);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  // Blink red until the first valid input is received
  if (!firstInputReceived) {
    blinkRed();
  }

  // Check if at least 3 bytes have been received
  if (Serial.available() >= 3) {
    // Read the RGB values
    int redValue = Serial.read();
    int greenValue = Serial.read();
    int blueValue = Serial.read();

    // Check if the values are within the valid range (0-255)
    if (isValidValue(redValue) && isValidValue(greenValue) && isValidValue(blueValue)) {
      // Set the RGB LED color
      analogWrite(redPin, redValue);
      analogWrite(greenPin, greenValue);
      analogWrite(bluePin, blueValue);
      firstInputReceived = true; // Mark the first input as received
    } else {
      // Blink red to indicate an error
      blinkRed();
    }
  }
}

// Function to blink the LED red
void blinkRed() {
  setColor(255, 0, 0); // Set LED to red
  delay(500);          // Wait for 500ms
  setColor(0, 0, 0);   // Turn off LED
  delay(500);          // Wait for 500ms
}

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

// Function to check if the value is within the valid range
bool isValidValue(int value) {
  return value >= 0 && value <= 255;
}