#include <WiFi.h>
#include "DHTesp.h"
#include "ThingSpeak.h"

const int DHT_PIN = 15;
const int ULTRASONIC_TRIG_PIN = 23;
const int ULTRASONIC_ECHO_PIN = 22;
const int LDR_PIN = A0; 
const int LED_PIN = 13;
const int POT_PIN = 34;
const int PIR_SENSOR_PIN = 27; // PIR motion sensor pin
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2430634;
const char* myApiKey = "00H0KL85OGHQJU93";
const char* server = "api.thingspeak.com";

DHTesp dhtSensor;
WiFiClient client;

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(ULTRASONIC_TRIG_PIN, OUTPUT);
  pinMode(ULTRASONIC_ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(PIR_SENSOR_PIN, INPUT); // Initialize PIR motion sensor pin
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Wifi not connected");
  }
  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  float temperature = dhtSensor.getTemperature();
  float humidity = dhtSensor.getHumidity();
  float distance = getUltrasonicDistance();
  float ldrValue = getLDRValue();
  float pressure = readPressure();
  int motion = digitalRead(PIR_SENSOR_PIN);
  
  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  ThingSpeak.setField(3, distance);
  ThingSpeak.setField(4, ldrValue); // Set LDR sensor data
  ThingSpeak.setField(5, motion); // Set motion sensor data
  ThingSpeak.setField(6, pressure);

  if (temperature > 35 || temperature < 12 || humidity > 70 || humidity < 40 || distance > 100 || motion == HIGH) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
  
  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  
  Serial.println("Temperature: " + String(temperature, 2) + "°C");
  Serial.println("Humidity: " + String(humidity, 1) + "%");
  Serial.println("Distance: " + String(distance) + " cm");
  Serial.println("LDR Voltage: " + String(ldrValue) + " V");
  Serial.println("Motion: " + String(motion));
  Serial.println("Pressure: " + String(pressure));
  
  if (x == 200) {
    Serial.println("Data pushed successfully");
  } 
  Serial.println("---");

  delay(1000);
}

float readPressure() {
  int potValue = analogRead(POT_PIN);
  float pressure = map(potValue, 0, 1023, 0, 100); // Map analog value to pressure range (0-100)
  return pressure;
}

float getLDRValue() {
  int ldrValue = analogRead(LDR_PIN);
  float ldrVoltage = ldrValue * (5.0 / 1023.0); // Convert analog reading to voltage
  return ldrVoltage;
}

float getUltrasonicDistance() {
  digitalWrite(ULTRASONIC_TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(ULTRASONIC_TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(ULTRASONIC_TRIG_PIN, LOW);
  
  unsigned long duration = pulseIn(ULTRASONIC_ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2; // Speed of sound is 34 cm/ms
  return distance;
}