// Forum: https://forum.arduino.cc/t/can-anyone-fix-my-code-its-a-code-for-an-earthquake-detector/1298745
// This Wokwi project: https://wokwi.com/projects/408180479992170497

#include <LiquidCrystal_I2C.h>

// LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
LiquidCrystal_I2C lcd(0x3F, 16, 2);

#define buzzer 12
#define led 13
#define x A0
#define y A1
#define z A2
int xsample = 0;
int ysample = 0;
int zsample = 0;
long start;
int buz = 0;

/* Macros */
#define samples 9
#define maxVal 3
#define minVal -3
#define buzTime 2000

void setup()
{
  // begin(16, 2);
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  delay(1000);

  lcd.print("EarthQuake");
  lcd.setCursor(0, 1);
  lcd.print("Detector");
  delay(2000);
  
  lcd.clear();
  lcd.print("Calibrating.....");
  lcd.setCursor(0, 1);
  lcd.print("Please wait...");

  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);

  buz = 0;
  digitalWrite(buzzer, buz);
  digitalWrite(led, buz);
  for (int i = 0; i < samples; i++)
  {
    xsample += analogRead(x);
    ysample += analogRead(y);
    zsample += analogRead(z);
  }

  xsample /= samples;
  ysample /= samples;
  zsample /= samples;

  delay(3000);
  lcd.clear();
  lcd.print("Calibrated");
  delay(1000);
  lcd.clear();
  lcd.print("Device Ready");
  delay(1000);
  lcd.clear();
  lcd.print(" X Y Z ");
}

void loop()
{
  int value1 = analogRead(x);
  int value2 = analogRead(y);
  int value3 = analogRead(z);
  int xValue = xsample - value1;
  int yValue = ysample - value2;
  int zValue = zsample - value3;
  lcd.setCursor(0, 1);
  lcd.print(xValue);
  lcd.setCursor(6, 1);
  lcd.print(yValue);
  lcd.setCursor(12, 1);
  lcd.print(zValue);
  delay(100);

  if (xValue < minVal || xValue > maxVal || yValue < minVal || yValue > maxVal || zValue < minVal || zValue > maxVal)
  {
    if (buz == 0)
      start = millis();
    buz = 1;
  }
  else if (buz == 1)
  {
    lcd.setCursor(0, 0);
    lcd.print("Earthquake Alert ");
    if (millis() >= start + buzTime)
      buz = 0;
  }
  else
  {
    lcd.clear();
    lcd.print(" X Y Z ");
  }

  digitalWrite(buzzer, buz);
  digitalWrite(led, buz);
  Serial.print("x=");
  Serial.println(xValue);
  Serial.print("y=");
  Serial.println(yValue);
  Serial.print("z=");
  Serial.println(zValue);
  Serial.println("$");
}