#include <LiquidCrystal_I2C.h>
#include "ThingSpeak.h"
#include <WiFi.h>
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

char* ssid = "Wokwi-GUEST"; //enter SSID
char* passphrase = ""; // enter the password
WiFiServer server(80);
WiFiClient client;

unsigned long myChannelNumber = 1;
const char * myWriteAPIKey = "5VGIRLVNYGITF7KC"; 

int ldrPin = 15;
int inputPin = 2;
int pir = LOW;
int val = 0;
int ledPin = 12; 

const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {
  Serial.begin(9600);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, passphrase);
  while (WiFi.status() != WL_CONNECTED) {
  delay(500);
  Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();

  pinMode(ldrPin, INPUT);
  pinMode(inputPin, INPUT);
  pinMode(ledPin, OUTPUT); 

  LCD.init();
  LCD.backlight();
  LCD.setCursor(1,0);
  LCD.print("  TUGAS CAAS  ");
  LCD.setCursor(2,1);
  LCD.print("LAMPU  TIDUR");
  delay(2000);
  LCD.clear();
  
  ThingSpeak.begin(client); // Initialize ThingSpeak
}

void loop() {
val = digitalRead(inputPin);

int ldrValue = analogRead(ldrPin); //membaca nilai analog pada pin A0 dari sensor ldr
float voltase = ldrValue / 1024. * 5; //rumus mengubah nilai sinyal analog dari ldr menjadi nilai voltase
float resistansi = 2000 * voltase / (1-voltase / 5); //rumus mencari nilai resistansi dari nilai voltase sebelumnya
float kecerahan = pow(RL10 * 1e3 * pow(10, GAMMA) / resistansi, (1/GAMMA)); //rumus mencari nilai tingkat kecerahan (kecerahan)


if((kecerahan > 50) && (val == LOW)){
  digitalWrite(ledPin, LOW);
  LCD.setCursor(0,0);
  LCD.print("  STATUS LAMPU  ");
  if(pir == LOW){
    LCD.setCursor(0,1);
    LCD.print("     Mati     ");
    pir = HIGH;
    digitalWrite(ledPin, LOW);
  }
}

else{
  digitalWrite(ledPin, HIGH);
  LCD.setCursor(0,0);
  LCD.print("   STATUS LAMPU  ");
  if(pir == HIGH){
    LCD.setCursor(0,1);
    LCD.print("     Nyala     ");
    pir = LOW;
    digitalWrite(ledPin, HIGH);
    
  }
}
//ThingSpeak.setField(1,val);
//ThingSpeak.setField(2,ldrPin);

int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
if (x == 200){
  Serial.println("Data Terkirim");
}
else{
  Serial.println("Data Tidak Berhasil Terkirim, ");
}

delay(1000);
}