#include <DHT.h>
#include <WiFi.h>
#include <Servo.h>

#define DHTPIN 4
#define DHTTYPE DHT22
#define TRIG_PIN 5
#define ECHO_PIN 18
#define SERVO_PIN 16

const char* ssid = "Wokwi-GUEST";
const char* password = "";

DHT dht(DHTPIN, DHTTYPE);
Servo servo;

unsigned long previousMillis = 0;
const long interval = 60000; // Feed every 1 minute (adjust as needed)

// Food level function
float getFoodLevel() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2; // cm
  return distance;
}

void setup() {
  Serial.begin(115200);
  dht.begin();
  WiFi.begin(ssid, password);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  
  servo.attach(SERVO_PIN);
  servo.write(0); // Close chute initially
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  // Monitor environment
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  Serial.print("Temp: "); Serial.print(temp); Serial.print(" °C, ");
  Serial.print("Humidity: "); Serial.print(hum); Serial.println(" %");

  // Check food level
  float foodLevel = getFoodLevel();
  Serial.print("Food Level (cm): "); Serial.println(foodLevel);

  if (foodLevel > 20) { // Low food warning if distance is > 20 cm
    Serial.println("Warning: Low food level!");
  }

  // Automatic feeding logic
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    dispenseFood();
  }

  delay(2000);
}

// Function to dispense food
void dispenseFood() {
  Serial.println("Dispensing food...");
  servo.write(90); // Open chute
  delay(3000); // Wait for food to drop
  servo.write(0); // Close chute
}