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Essay On External Mechanism

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External mechanism to prevent irreversible damage to hardware components of a cellular phone
(Mobile White Knight)

Eram Khan
Department of Electronics and Telecommunication
Army Institute of Technology
Pune, India eramkhan94@gmail.com Ashish Panchal
Department of Electronics and Telecommunication
Army Institute of Technology
Pune, India ashupanchal.007@gmail.com Abstract— a low cost external (case-like) air bag mechanism is proposed for protection of expensive fragile smartphones from severe hardware damage. This external helping mechanism is constructed by utilizing inbuilt accelerometer of a mobile phone interfaced with its internal microcontroller. A critical acceleration will be detected by the internal gyroscope of a phone, detecting free fall. Micro sharp sensors (External to the mobile, connected via Bluetooth to the …show more content…

Using the mobile white knight as a back cover
Mobile white knight is very user friendly. The basic steps involved are as follows:
1. The back cover of the smartphone is to be taken off. The mobile white knight is put on at the back.
2. The device driver with the source code for programming has to be activated. The Bluetooth module of the cell phone is switched on.
3. Now, in case of any incident like an accidental drop, abrupt change in internal accelerometer is detected also, also IR detects if the surface is dangerously close.
4. A signal is sent via Bluetooth and base current of about 1 mA is applied to cartridge resulting in a minute explosion. And hence, air bag is inflated before the smartphone hits the ground protecting it from severe damage.
5. In order to use the airbag again, air is let out through a manual opening provided and airbag is fit back into the case. The cartridges are replaceable and the chemicals used as explosives are very economical and easily available.
III. CONSTRUCTION
The main hardware components of the mobile white knight are IR sensors, Bluetooth module, explosive cartridge and the

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