// Library
#include <DHT.h>

// DHT 11 Declaration
#define DHTPIN 14
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE); 

// LDR PIN
#define LdrPin 34

// Soil Moisture
#define soilMoisturePin 15
int soilMoistureValue;

//relay module
const int RELAY_PIN = 16;

// LDR Function
float calculateBrightness(int ldrRawValue) {
  const float gama = 0.7;
  const float rl10 = 50;
  ldrRawValue = map(ldrRawValue, 4095, 0, 1024, 0); //mengubah nilai pembacaan sensor LDR dari nilai ADC arduino menjadi nilai ADC ESP32
  float voltase = ldrRawValue / 1024.*5;
  float resistansi = 2000 * voltase / (1-voltase/5);
  float kecerahan = pow(rl10*1e3*pow(10,gama)/resistansi,(1/gama));
  return kecerahan;
}


void setup(){
     // Set software serial baud to 115200;
    Serial.begin(9600);
    
    //Starting DHT11 scanning
    dht.begin();

    //relay module
    pinMode(RELAY_PIN, OUTPUT);

}

void loop() {
    //DHT11 Scanning
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    float hic = dht.computeHeatIndex(t, h, false);

    //LDR Sensor Scanning
    int ldrRawValue = analogRead(LdrPin);
    float brightness = calculateBrightness(ldrRawValue);

    //Soil Moisture
    soilMoistureValue = analogRead(soilMoisturePin);

    // DHT11 Output in Serial Monitor
    Serial.print(F("Humidity: "));
    Serial.print(h);
    Serial.print(F("% Temperature: "));
    Serial.print(t);
    Serial.println(" *C ");

    // LDR Output in Serial Monitor
    Serial.print("Brightness: ");
    Serial.print(brightness);
    Serial.println(" lux ");

    Serial.print("Soil Moisture: ");
    Serial.print(soilMoistureValue);
    Serial.println(" cm ");

    //mr, jarak syarat ifnya terlalu kecil. sedangkan nilai potentionya besar
    if(soilMoistureValue>=75 && soilMoistureValue<=100){
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("Relay: ON");
  }
  else{
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("Relay: OFF");
  }

    delay(2000);
}