Hello Makers....
All of you might be aware about the earthquake the struck Nepal a week ago.... I too felt that....It was scary.....
Then I thought of making a device that could detect an earthquake and sound an alarm..So what else could do the job except a MINI COMPUTER OR AN ARDUINO
So roll up your sleeves and get started...
Though its a bit costly....but what costs more than life....

Step 1: Materials

1. A breadboard...(Large or small)
Link:- http://www.amazon.com/gp/aw/d/B005GYATUG/ref=mp_s_a_1_4?qid=1430585122&sr=8-4π=AC_SX110_SY165_QL70&keywords=breadboard

2. Tilt switch
Link:- http://www.amazon.com/gp/aw/d/B00VUS24BY/ref=mp_s_a_1_14?qid=1430585222&sr=8-14π=AC_SX110_SY165_QL70&keywords=tilt+switch

3. Piezo buzzer
Link:- http://www.amazon.com/gp/aw/d/B00DKC993O/ref=mp_s_a_1_4?qid=1430585426&sr=1-4π=AC_SX110_SY165_QL70&keywords=piezo+buzzer+3v

4. Arduino with jumper cables
Link:- http://www.rs-components.com/arduino/index.html

5. 1k ohm resistor
6. A computer/laptop to load program to arduino

Step 2: Building the Life Saver

Follow the schematic , make all connections and then load the following program on arduino
Copy after this------>
#define TILT_SWITCH_PIN A0
#define BUZZER_PIN 10
#define MAX 100
int tiltValue = 0;
int previousTiltValue = 0;
int valueThreshold = 5;
int timeThreshold = 2 ;
int time = 0;

void setup()
{
pinMode(BUZZER_PIN, OUTPUT);
}

void loop()
{
tiltValue = analogRead(TILT_SWITCH_PIN);
if(abs(tiltValue - previousTiltValue) >= valueThreshold)
{
time = time + 1;
}
else
{
reset();
}
if(time >= timeThreshold)
{
analogWrite(BUZZER_PIN, MAX);
delay(500);
reset();
}
previousTiltValue = tiltValue;
delay(500);
}

void reset()
{
time = 0;
previousTiltValue = 0;
analogWrite(BUZZER_PIN, 0);
}