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

WiFiClient client;
long myChannelNumber = 2629584;
const char * myWriteAPIKey = "5ZNFTPSKNSMDPNL1";
int statusCode;

char ssid[] = "Abc";
char pass[] = "123456789";

DHTesp dht;
TempAndHumidity data;

int r = 25;
int o = 26;
int g = 27;
int trig = 17;
int echo = 16;
int buzzer = 4;

void setup() {
  ThingSpeak.begin(client);
  pinMode(r, OUTPUT);
  pinMode(o, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(buzzer, OUTPUT);
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  
  dht.setup(18, DHTesp::DHT22);
  
  WiFi.mode(WIFI_STA);
  connectToWiFi();
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    connectToWiFi();
  }

  data = dht.getTempAndHumidity();
  float distanceValue = distance();

  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);
  ThingSpeak.setField(3, distanceValue);

  statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.print("Problem Writing data. HTTP error code: ");
    Serial.println(statusCode);
  }

  Serial.print("Temperature: ");
  Serial.println(data.temperature);
  Serial.print("Humidity: ");
  Serial.println(data.humidity);
  Serial.print("Distance: ");
  Serial.println(distanceValue);

  delay(10000); // Adjusted delay to reduce frequency of updates
}

void connectToWiFi() {
  Serial.println("Attempting to connect to WiFi...");
  WiFi.begin(ssid, pass);

  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 30) { // Limit attempts to prevent infinite loop
    delay(500);
    Serial.print(".");
    attempts++;
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("Connected to WiFi!");
  } else {
    Serial.println("Failed to connect to WiFi.");
  }
}

int distance() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  
  float duration = pulseIn(echo, HIGH);
  float distance = (duration * 0.0344) / 2; // 0.0344 cm/us is the speed of sound divided by 2
  return distance;
}