Arduino_code.ino

#include <WiFi.h>
#include <Firebase_ESP_Client.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <DHT.h>
#include "addons/TokenHelper.h"
#include "addons/RTDBHelper.h"
#include "time.h"

// -------- WiFi --------
#define WIFI_SSID ""
#define WIFI_PASSWORD ""

// -------- Firebase --------
#define API_KEY ""
#define DATABASE_URL ""

FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;

// -------- Sensor Power --------
#define SENSOR_POWER_PIN 26

// -------- Sensors --------
#define ONE_WIRE_BUS 21
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature ds18b20(&oneWire);

#define DHTPIN 19
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// -------- Time --------
const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 5 * 3600 + 30 * 60;

// -------- Sleep --------
#define uS_TO_S_FACTOR 1000000ULL
#define SLEEP_INTERVAL 1200  // 20 minutes

#define CATTLE_ID "Cattle2"

// -------- Time String --------
String getTimeString() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) return "NA";
  char buf[25];
  strftime(buf, sizeof(buf), "%Y-%m-%d_%H-%M-%S", &timeinfo);
  return String(buf);
}

void setup() {
  Serial.begin(115200);
  delay(500);

  Serial.println("\n===== ESP32 BOOT =====");

  // -------- Power Sensors ON --------
  pinMode(SENSOR_POWER_PIN, OUTPUT);
  digitalWrite(SENSOR_POWER_PIN, HIGH);
  Serial.println("Sensors POWER ON");
  delay(600);

  ds18b20.begin();
  dht.begin();
  Serial.println("Sensors initialized");

  // -------- WiFi --------
  Serial.print("Connecting to WiFi");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  unsigned long startAttempt = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - startAttempt < 10000) {
    Serial.print(".");
    delay(300);
  }

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("\nWiFi FAILED → Sleep");
    goToSleep();
  }

  Serial.println("\nWiFi Connected");
  Serial.println(WiFi.localIP());

  // -------- Firebase (OLD STYLE – WORKING) --------
  config.api_key = API_KEY;
  config.database_url = DATABASE_URL;

  if (Firebase.signUp(&config, &auth, "", "")) {
    Serial.println("Firebase SignUp OK");
  } else {
    Serial.print("Firebase SignUp FAILED: ");
    Serial.println(config.signer.signupError.message.c_str());
    goToSleep();
  }

  Firebase.begin(&config, &auth);
  Firebase.reconnectWiFi(true);
  Serial.println("Firebase Initialized");

  // -------- Time --------
  configTime(gmtOffset_sec, 0, ntpServer);
  delay(1500);
  Serial.print("Time: ");
  Serial.println(getTimeString());

  // -------- Read deviceStatus --------
  String deviceStatus = "OFF";

  if (Firebase.RTDB.getString(&fbdo, "/deviceStatus")) {
    deviceStatus = fbdo.stringData();
    deviceStatus.trim();  // IMPORTANT
  } else {
    Serial.print("Firebase read error: ");
    Serial.println(fbdo.errorReason());
  }

  Serial.print("Device Status = ");
  Serial.println(deviceStatus);

  // -------- Upload Only If ON --------
  if (deviceStatus.equalsIgnoreCase("ON")) {
    Serial.println("Device ON → Reading sensors");

    ds18b20.requestTemperatures();
    float bodyTemp = ds18b20.getTempCByIndex(0);
    float envTemp = dht.readTemperature();
    float humidity = dht.readHumidity();

    Serial.print("Body Temp: "); Serial.println(bodyTemp);
    Serial.print("Env Temp : "); Serial.println(envTemp);
    Serial.print("Humidity : "); Serial.println(humidity);

    if (!isnan(envTemp) && !isnan(humidity)) {
      String path = "/collars/" + String(CATTLE_ID) + "/" + getTimeString();

      Firebase.RTDB.setFloat(&fbdo, path + "/bodyTemp", bodyTemp);
      Firebase.RTDB.setFloat(&fbdo, path + "/envTemp", envTemp);
      Firebase.RTDB.setFloat(&fbdo, path + "/humidity", humidity);

      Serial.println("Data uploaded to Firebase");
    } else {
      Serial.println("Sensor error → Upload skipped");
    }
  } else {
    Serial.println("Device OFF → No upload");
  }

  // -------- Power Down --------
  digitalWrite(SENSOR_POWER_PIN, LOW);
  Serial.println("Sensors POWER OFF");

  WiFi.disconnect(true);
  WiFi.mode(WIFI_OFF);
  Serial.println("WiFi OFF");

  goToSleep();
}

// -------- Deep Sleep --------
void goToSleep() {
  Serial.println("Going to deep sleep for 20 minutes...\n");
  delay(200);
  esp_sleep_enable_timer_wakeup(SLEEP_INTERVAL * uS_TO_S_FACTOR);
  esp_deep_sleep_start();
}

void loop() {}