#include <DHT.h>
#define NODE 1

// NODE 1 — DHT22 + Relay
#if NODE == 1

#define DHT_PIN 15
#define DHT_TYPE DHT22
#define RELAY_PIN 26

DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
  Serial.begin(115200);
  delay(1000);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); // Relay off by default
  dht.begin();
  Serial.println("ESP32 #1 ready — DHT22 + Relay");
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("DHT read error!");
    delay(2000);
    return;
  }

  Serial.print("Temp: "); Serial.print(temperature); Serial.println(" C");
  Serial.print("Humidity: "); Serial.print(humidity); Serial.println(" %");

  // Trigger relay if temperature exceeds 22°C
  if (temperature > 22.0) {
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("Relay ON — temperature threshold exceeded");
  } else {
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("Relay OFF — temperature within range");
  }

  delay(2000);
}

// NODE 2 — MQ2 Gas Sensor
#elif NODE == 2

#define MQ2_PIN 34

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("ESP32 #2 ready — MQ2 Gas Sensor");
}

void loop() {
  int gasRaw = analogRead(MQ2_PIN);
  Serial.print("Gas (raw): ");
  Serial.println(gasRaw);
  delay(2000);
}

#endif