// Pin definitions
#define LDR     2  // A0 on Seeed XIAO ESP32-C3 
#define BLED    3   // Blue LED
#define GLED    4   // Green LED
#define RWHITE  5   // Red or White LED
#define BUTTON  6   // Digital input with pull-up
#define BUZZER  8   // Buzzer


// Timing
unsigned long lastUpdate = 0;
const unsigned long interval = 100; // 100ms for responsive updates

void setup() {
  Serial.begin(115200);

  pinMode(BUTTON, INPUT_PULLUP); // Button connected to GND

  pinMode(BLED, OUTPUT);
  pinMode(GLED, OUTPUT);
  pinMode(RWHITE, OUTPUT);
  pinMode(BUZZER, OUTPUT);
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - lastUpdate >= interval) {
    lastUpdate = currentMillis;

    int ldrValue = analogRead(LDR);         // Read light level (0–4095)
    int buttonState = digitalRead(BUTTON);  // LOW when pressed

    Serial.print("LDR: ");
    Serial.print(ldrValue);
    Serial.print(" | Button: ");
    Serial.println(buttonState);

    // Threshold for night (adjust based on real readings)
    bool isNight = ldrValue < 60;

    // LED control based on light level
    digitalWrite(BLED,    isNight ? HIGH : LOW);
    digitalWrite(GLED,    isNight ? HIGH : LOW);
    digitalWrite(RWHITE,  isNight ? HIGH : LOW);
    digitalWrite(RWHITE,  isNight ? HIGH : LOW);

    // Buzzer ON only while button is pressed
    digitalWrite(BUZZER, buttonState == LOW ? HIGH : LOW);
  }

  // Place for other non-blocking tasks
}