#include <WiFi.h>
#include <PubSubClient.h>
#include "DHT.h"
#include <Stepper.h>

// WiFi configuration
const char* ssid = "Wokwi-GUEST";
const char* password = "";


// ThingsBoard configuration
const char* mqttServer = "demo.thingsboard.io";
const int mqttPort = 1883;
const char* accessToken = "8056JFadXJVg1etNwVbw"; // Replace with your ThingsBoard device token

WiFiClient wifiClient;
PubSubClient client(wifiClient);

#define DHTPIN 21   
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

const int stepsPerRevolution = 10000;
Stepper myStepper(stepsPerRevolution, 33, 25, 26, 27);

const int relayPin = 15;
const int relayPin1 = 18;
const int pressureInput = 13;
const int potPin = 12;
const int voltage = 14;

const int pressureZero = 102.4;
const int pressureMax = 921.6;
const int pressuretransducermaxPSI = 100;

float pressureValue = 0;
float humidity = 0;

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

  // Initialize pins
  pinMode(relayPin, OUTPUT);
  pinMode(relayPin1, OUTPUT);
  pinMode(pressureInput, INPUT);
  pinMode(potPin, INPUT);
  pinMode(voltage, INPUT);

  myStepper.setSpeed(100);
  dht.begin();

  // Connect to WiFi
  connectToWiFi();

  // Configure MQTT client
  client.setServer(mqttServer, mqttPort);
}

void loop() {
  if (!client.connected()) {
    reconnectMQTT();
  }
  client.loop();

  // Read sensor data
  pressureValue = analogRead(pressureInput);
  pressureValue = ((pressureValue - pressureZero) * pressuretransducermaxPSI) / (pressureMax - pressureZero);

  int potValue = analogRead(potPin);
  humidity = map(potValue, 0, 4095, 0, 100);

  int sensorValue1 = analogRead(voltage);
  float voltage1 = (sensorValue1 / 4095.0) * 3.3 * 230.0;

  float temperature = dht.readTemperature();

  // Log sensor data
  Serial.println("Sending data to ThingsBoard...");
  String payload = String("{\"pressure\":") + pressureValue +
                   ",\"humidity\":" + humidity +
                   ",\"voltage\":" + voltage1 +
                   ",\"temperature\":" + temperature +
                   ",\"relayPin\":" + relayPin + "}";

  if (client.publish("v1/devices/me/telemetry", payload.c_str())) {
    Serial.println("Data sent successfully!");
  } else {
    Serial.println("Failed to send data.");
  }

  // Control relays and stepper motor
  if (pressureValue > 108) {
    digitalWrite(relayPin, HIGH);
  } else if (pressureValue < 43) {
    digitalWrite(relayPin, LOW);
    myStepper.step(stepsPerRevolution);
  }

  if (temperature > 50.0) {
    digitalWrite(relayPin1, HIGH);
  } else {
    digitalWrite(relayPin1, LOW);
  }

  delay(5000);
}

void connectToWiFi() {
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting...");
  }

  Serial.println("WiFi connected!");
}

void reconnectMQTT() {
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect("ESP32", accessToken, "")) {
      Serial.println("Connected to MQTT!");
    } else {
      Serial.print("Failed to connect. Error state=");
      Serial.println(client.state());
      delay(2000);
    }
  }
}