Earthquake Detector using Arduino

Introduction:

The places prone to Earthquake face a huge amount of destruction every time the calamity occurs.We need a device that can work as an alarm as soon as it detects any unusual movement or shake. It will not be able to reduce the physical destruction but many lives can be saved. So, here we are trying to build a project which will be capable of detecting the earthquake. Every time it will detect shakes, the buzzer  will ring and LCD will show the message to “Evacuate”.

Components and their Usage:

• Bread Board 
• Arduino NANO 
• ADXL335 
• LCD 16×2 
• 10k pot
• Buzzer
• LED 
• 2 Push Buttons
• Resistors (220 ohms, 10 k)
• Jumper wires 

Adxl335 will detect movement in any direction. 2 switches are used to increase and decrease the threshold value. Buzzer is working as an alarm. LCD is basically used for displaying the warning whenever any movements are detected .

Circuit Diagram:

Code:

#include <EEPROM.h>

#include "EEPROMAnything.h"

#include <LiquidCrystal.h>

const int alarmPin = 5;

const int relayPin = 10;

int Xacc, Yacc, Zacc, threshold = 0, thresholdSET = 25;

long debouncing_time = 15; //Debouncing Time in Milliseconds

volatile unsigned long last_micros;

LiquidCrystal lcd(12, 11, 9, 8, 7, 6);

struct sensorValue

{

  int X;

  int Y;

  int Z;

};

sensorValue acceleration;

void debounceInterrupt_Increment()

{

  if ((long)(micros() - last_micros) >= debouncing_time * 1000) {

    IncrementThreshold();

    last_micros = micros();

  }

}

void debounceInterrupt_Decrement()

{

  if ((long)(micros() - last_micros) >= debouncing_time * 1000) {

    DecrementThreshold();

    last_micros = micros();

  }

}

void IncrementThreshold() {

  thresholdSET = EEPROM.read(500);

  thresholdSET++;

  EEPROM.write(500, thresholdSET);

}

void DecrementThreshold() {

  thresholdSET = EEPROM.read(500);

  thresholdSET--;

  EEPROM.write(500, thresholdSET);

}

void setup() {

  lcd.begin(16, 2);

  attachInterrupt(0, debounceInterrupt_Increment, RISING);

  attachInterrupt(1, debounceInterrupt_Decrement, RISING);

  pinMode(alarmPin, OUTPUT);

  pinMode(relayPin, OUTPUT);

  digitalWrite(relayPin, HIGH);

  EEPROM.write(500, thresholdSET);

  digitalWrite(alarmPin, LOW);

  lcd.setCursor(0, 0);

  lcd.print("Initializing....");

  delay(5000);

  sensorValue acceleration = { analogRead(A0) , analogRead(A1) , analogRead(A2) };

  EEPROM_writeAnything(0, acceleration);

  EEPROM_readAnything(0, acceleration);

  lcd.clear();

}

void loop() {

  EEPROM_readAnything(0, acceleration);

  threshold = EEPROM.read(500);

  lcd.setCursor(0, 0);

  lcd.print("Monitoring Mode");

  lcd.setCursor(0,1);

  lcd.print("Threshold = ");

  lcd.print(threshold);

  Xacc = analogRead(A0);

  Yacc = analogRead(A1);

  Zacc = analogRead(A2);

  if ((Xacc >= (acceleration.X + threshold)) || (Xacc <= (acceleration.X - threshold))||(Yacc >= (acceleration.Y + threshold)) || (Yacc <= (acceleration.Y - threshold))||(Zacc >= (acceleration.Z + threshold)) || (Zacc <= (acceleration.Z - threshold))) {

    digitalWrite(relayPin, LOW);

    digitalWrite(alarmPin, HIGH);

    lcd.clear();

    lcd.setCursor(0, 0);

    lcd.print("ALARM !!!!!");

    lcd.setCursor(0,1);

    lcd.print("PLEASE EVACUATE");

    delay(5000);

    digitalWrite(relayPin, HIGH);

    digitalWrite(alarmPin, LOW);

    lcd.clear();

  }

}