bool autoMode = true;
int currentR = 0, currentG = 0, currentB = 0;
int ledR, ledG, ledB;

void setup() {
  pinMode(A0, INPUT);
  pinMode(13, INPUT_PULLUP);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
}

void loop() {
  if (digitalRead(13) == LOW) {
    toggleControlMode();
    delay(200);
  }

  int save = analogRead(A0);
  if (autoMode) {
    int temp = calculateColorTemperature(save);
    mapToRGB(temp);
  }

  smoothTransition();
  delay(20);
}

int calculateColorTemperature(int save) {
  return map(save, 0, 1023, 2000, 8000);
}

void mapToRGB(int temp) {
  if (temp < 4000) {
    ledR = 255;
    ledG = map(temp, 2000, 4000, 100, 255);
    ledB = map(temp, 2000, 4000, 0, 100);
  } else { // холодный белый
    ledR = map(temp, 4000, 8000, 255, 150);
    ledG = map(temp, 4000, 8000, 255, 220);
    ledB = map(temp, 4000, 8000, 100, 255);
  }
}

void smoothTransition() {
  currentR += (ledR - currentR) / 10;
  currentG += (ledG - currentG) / 10;
  currentB += (ledB - currentB) / 10;

  analogWrite(9, currentR);
  analogWrite(10, currentG);
  analogWrite(11, currentB);
}

void toggleControlMode() {
  autoMode = !autoMode;
}