Earthquake Alarm System

1. Microcontroller ATmega328

2. 3-AXIS Digital Accelerometer ADXL335

3. 433MHz Wireless Remote Control Transmitter

4. the system is based on the ADXL335 accelerometer that has a detection range of ±3 g. It can measure the static acceleration due to gravity , as well as dynamic acceleration resulting from motion, shock, or vibration.

A metal ring mounted on the sensor ADXL335 contains perimeter loose steel spheres and magnifies the weak vibrations of the building creating a more intense shock to the sensor

the vibration of the building will turn on the device and it will sound alarm the LED will turn red

will also activate wireless receivers alarms in other rooms at frequency 433Mhz when the building stops vibrating the audible alarm will stop the LED will turn yellow and the device will return to standby mode

the LED will remain yellow (as a memory) reminding that there has been a vibration 

if we want to restore the entire system to its original state we ,press the reset button

https://sites.google.com/view/electrodevelo/home-page/earthquake-alarm-new