// Diploma Project
// Title  : IoT based Low-cost Weather Monitoring System for Smart Farming


// Referensi kebutuhan cahaya tanaman : 
// https://sustainablecampus.unimelb.edu.au/__data/assets/pdf_file/0005/2839190/Indoor-plant-workshop-Light-and-Moisture-Requirements.pdf

#include <WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include "LiquidCrystal_I2C.h"
#include "DHT.h"
#include <HTTPClient.h>

#define relayPin 18
#define ldrPin 35
#define DHT_PIN 15
#define DHTTYPE DHT22
#define LED_PIN 33
DHT dht(DHT_PIN, DHT22);
LiquidCrystal_I2C lcd(0x27,20,4);
LiquidCrystal_I2C lcd2(0x27,20,4);

// Representasi sensor FC28 dengan menggunakan potentiometer
#include "FC28.h" 
#define SensorFC28_Pin 34 
float soil_moisture; 
FC28Sensor mySensor;

const float gama = 0.7;
const float rl10 = 50;

void setup() {
  Serial.begin(9600);
  Serial.flush();
  pinMode(ldrPin, INPUT);
  pinMode(DHT_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(relayPin, OUTPUT);
  mySensor.initFC28Sensor(115200, SensorFC28_Pin); 

  Wire.begin();

  Serial.println("Smart Farming System");
  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Final Project");
  lcd.setCursor(0,1);
  lcd.print("IoT Bootcamp Edspert");
  lcd.setCursor(0,2);
  lcd.print("Smart Farming and");
  lcd.setCursor(0,3);
  lcd.print("Monitoring System");
  delay(2000);
  lcd.clear();
    // Connect to Wi-Fi
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  // Data sensor DHT22
    float hum = dht.readHumidity();
    float temp = dht.readTemperature();
    Serial.println("Suhu                : " + String(temp, 2) + " °C");
    Serial.println("Kelembaban          : " + String(hum, 1) + " %");

  // Data sensor LDR
    int ldrValue = analogRead(ldrPin);
    ldrValue = map(ldrValue, 4095, 0, 1024, 0); //mengubah nilai pembacaan sensor LDR dari nilai ADC arduino menjadi nilai ADC ESP32
    float ldrVoltage = ldrValue / 1024.*5;
    float ldrResistance = 2000 * ldrVoltage / (1-ldrVoltage/5);
    float lux = pow(rl10*1e3*pow(10,gama)/ldrResistance,(1/gama));
    Serial.println("Kecerahan           : " + String(lux, 3) + " Lux");
    String luxmsg = lux < 807 ? "Kurang" : lux > 808 && lux < 1614? "Medium" : "Tinggi";

  // Data sensor Soil Moisture FC28 
    soil_moisture = mySensor.getSoilMoisture();
    String msg = soil_moisture < 33.33 ? "Basah" : soil_moisture > 66.66 ? "Kering" : "Normal";
    Serial.println("Soil Moisture Value : "+String(soil_moisture,2)+" %");
    
  // Relay untuk membuka jalur air ke tanaman berdasarkan kondisi kelembaban tanah
  if((soil_moisture > 66.66)){
    digitalWrite(relayPin, HIGH);
  }
  else{
    digitalWrite(relayPin, LOW);
  }

  // Output LCD untuk monitoring kondisi tumbuhan
    // Kondisi Tanah
    lcd.setCursor(0,0);
    lcd.print("Tanah      :");
    lcd.setCursor(13,0);
    lcd.print(msg);

    // Kondisi kecerahan dan terang nyala LED
    if (lux < 807){
      digitalWrite(LED_PIN, HIGH);
      lcd.setCursor(0,1);
      lcd.print("Kecerahan  : ");
      lcd.setCursor(13,1);
      lcd.print(luxmsg);
    }
    else if (lux > 808 && lux < 1614){
      digitalWrite(LED_PIN, LOW);
      lcd.setCursor(0,1);
      lcd.print("Kecerahan  : ");
      lcd.setCursor(13,1);
      lcd.print(luxmsg);
    }
    else{
      digitalWrite(LED_PIN, LOW);
      lcd.setCursor(0,1);
      lcd.print("Kecerahan  : ");
      lcd.setCursor(13,1);
      lcd.print(luxmsg);
    }

    // Suhu
    lcd.setCursor(0,2);
    lcd.print("Suhu       :");
    lcd.setCursor(13,2);
    lcd.print(temp);
    lcd.setCursor(19,2);
    lcd.print("C");

    // Kelembaban
    lcd.setCursor(0,3);
    lcd.print("Kelembaban :");
    lcd.setCursor(13,3);
    lcd.print(hum);
    lcd.setCursor(19,3);
    lcd.print("%");

  Serial.println("--------------");
  delay(2000); 
  lcd.clear();
  sendDataToServer(soil_moisture, lux, temp, hum);
  delay(2000);
  lcd.clear();
}

void sendDataToServer(float soil_moisture, float lux, float temp, float hum) {
  HTTPClient http;

  http.begin("http://172.111.138.132:8000/post");
  http.addHeader("Content-Type", "application/json");

  String httpRequestData = "{\"soil_moisture\": " + String(soil_moisture)
                         + ", \"lux\": " + String(lux)
                         + ", \"temperature\": " + String(temp)
                         + ", \"humidity\": " + String(hum) + "}";
  int httpResponseCode = http.POST(httpRequestData);

  if (httpResponseCode>0) {
    String response = http.getString();
    Serial.println(httpResponseCode);
    Serial.println(response);
  } else {
    Serial.print("Error on sending POST: ");
    Serial.println(httpResponseCode);
  }

  http.end();
}