#include <WiFi.h>
#include <ThingSpeak.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h> // Include the LiquidCrystal_I2C library

// LiquidCrystal_I2C settings
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the I2C address for your LCD

#define trigerPin 12
#define echoPin 13
#define ledPin 14
#define speakerPin 15
#define pitch 262
#define CM_TO_INCH 0.393701

long duration;
float distance;
float distanceInch;

const char* ssid = "Wokwi-GUEST";
const char* pass = "";

WiFiClient alfa;

unsigned long ChannelID = 1725919;
const char *WriteAPI = "S9MVHFKU2S38LLV8";

void setup() {
  Serial.begin(115200);
  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(speakerPin, OUTPUT);

  Serial.println("Scan WiFi...");
  int networks = WiFi.scanNetworks();
  if (networks == 0) {
    Serial.println("No WiFi Networks!");
  } else {
    Serial.print(networks);
    Serial.println(" Networks Found!");
    for (int i = 0; i < networks; i++)
      Serial.println(WiFi.SSID());
    delay(10);
  }

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

  ThingSpeak.begin(alfa);

  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("ESP32 Ultrasonic");
  lcd.setCursor(0, 1);
  lcd.print("Alarm System");
  delay(2000);
  lcd.clear();
}

void loop() {
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigerPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) * 0.0343;
  distanceInch = distance * CM_TO_INCH;

  if (distance < 100) {
    digitalWrite(ledPin, HIGH);
    delay(1000);
    digitalWrite(ledPin, LOW);
    delay(100);
    tone(14, 262, 1000);
  } else {
    digitalWrite(ledPin, LOW);
  }

  int x = ThingSpeak.writeField(ChannelID, 1, distance, WriteAPI);

  if (distance < 100) {
    Serial.println("WARNING!");
    Serial.println("Distance (cm): " + String(distance));
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("ALERT: Intruder");
    lcd.setCursor(0, 1);
    lcd.print("Distance (cm): " + String(distance));
  } else {
    Serial.println("JARAK AMAN");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Security Status:");
    lcd.setCursor(0, 1);
    lcd.print("Safe");
  }

  delay(2000);
}