/* ABE 80 Exercise 8
Introduction to Internet of Things (IoT) Projects
Submitted by: Krizanrea Videl P. Batin
November 20, 2023
*/

#include <DHTesp.h> // REF: https://wokwi.com/projects/322410731508073042
#include <ESP32Servo.h> // REF: https://wokwi.com/projects/323706614646309460
#include <LiquidCrystal_I2C.h> // For wiring: https://www.esp32.com/viewtopic.php?t=23659
#include <WiFi.h> // REF: https://wokwi.com/projects/305569599398609473
#include <ThingSpeak.h>

const int DHT_PIN = 15;
const int servoPIN = 2;

DHTesp dhtSensor;
Servo myservo;
LiquidCrystal_I2C lcd(0x27, 16, 2);
WiFiClient client; // REF: https://www.arduino.cc/reference/en/libraries/wifi/wificlient/

const char* ssid = "Wokwi-GUEST";
const char* pass = ""; // REF: https://www.arduino.cc/reference/en/libraries/wifi/wifi.begin/

unsigned long myChannelNumber = 2342614;
const char* myWriteAPIKey = "78IO9HQQT8GKU71P";
const char* server = "api.thingspeak.com";

int temp;
int hum;
int pos = 0;

void setup() {
  Serial.begin(9600);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  myservo.attach(servoPIN, 500, 2400);
  lcd.init();
  lcd.backlight();

  WiFi.begin(ssid, pass);
  while(WiFi.status() != WL_CONNECTED){ // REF: https://www.arduino.cc/reference/en/libraries/wifi/wifi.status/
    Serial.print(".");
    delay (100);
  }
  Serial.println("WiFi Connected!");
  Serial.println("");
  WiFi.mode(WIFI_STA); // REF: https://randomnerdtutorials.com/esp32-useful-wi-fi-functions-arduino/

  ThingSpeak.begin(client);
}

void loop() {
  lcd.setCursor(0,0);
  lcd.print("ABE80");
  lcd.setCursor(0,1);
  lcd.print("EXER8");

  temp = dhtSensor.getTemperature();
  Serial.print("Temperature, C = ");
  Serial.println(temp);
  lcd.setCursor(8,0);
  lcd.print("T,C = ");
  lcd.print(temp);

  hum = dhtSensor.getHumidity();
  Serial.print("Humidity, % = ");
  Serial.println(hum);
  lcd.setCursor(8,1);
  lcd.print("H,% = ");
  lcd.print(hum);

  if(WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to reconnect.");
    while (WiFi.status() != WL_CONNECTED){
      WiFi.begin(ssid, pass);
      Serial.print(". ");
      delay (100);
    }
    Serial.println("Connected.");
  }

  if(temp >= 35 && hum >= 85){
    for (pos = 0; pos <= 180; pos += 1) {
      myservo.write(pos);
      delay (15);
    }
    for (pos = 180; pos >= 0; pos -= 1) {
      myservo.write(pos);
      delay (15);
    }
  }

  ThingSpeak.setField (1, temp);
  ThingSpeak.setField (2, hum);

  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (x == 200) {
    Serial.println("Channel update successful.");
  }
  else {
    Serial.println(("Problem updating channel. HTTP error code ") + String (x));
  }
  Serial.println();

  delay(20000);
  lcd.clear();
}