Accelerometer Based Free Fall Or Anti-Slippage Protection For HDD


Accelerometer Based Free Fall Or Anti-Slippage Protection For HDD



The main objective of this project is to develop an embedded system, which is used to protect the HDD from free fall using MEM’s.



This project is implemented 8051 based At89s52 developed board interfaced with

MEMS Sensor, Buzzer and LCD for displaying the data.




accelerometer based free fall

Click here to view Block Diagram (Free Registration )



accelerometer based free fall



Power Supply




[sam id=”5″ codes=”true”]


Microelectromechanical systems (MEMS) is the technology of the very small, and merges at the nano-scale into nano- electromechanical systems (NEMS) and nanotechnology. MEMS are also referred to as micro-machines or Micro Systems Technology – MST. MEMS are made up of components between 1 to 100 micrometres in size and MEMS devices generally range in size from 20 micrometres to a millimetre. They usually consist of a central unit that processes data, the microprocessor and several components that interact with the outside such as microsensors. Due to MEMS large surface area to volume ratio, surface effects such as electrostatics and wetting dominate volume effects such as inertia or thermal mass.

This property is used to detect any motion or change in acceleration due to gravity or simply called G force. The courier  transport system needs to be secured and at the same time, should be cargo protective such that they don’t get damaged during freight due to physical shocks. The present project deals with designing an activation system for the protection of such cargo by checking the change in G force. If motion or change is detected the protection system is activated.

The system uses a compact circuitry build around flash version of AT89S52 microcontroller with a non volatile memory. Programs are developed using Embedded C, compiled using RIDE tool. ISP is used to dump the code into microcontroller.



Embedded ‘C’

RIDE to write code

ISP to burn the chip



At89s52 based our own developed board

Power Supply

MEMS Sensor




ADVANTAGES: Low cost, automated operation, Low Power consumption.




  1. The 8051 micro controller and embedded systems by Mazidi.
  5. Embedded systems with 8051 by kenith j ayala


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