BRAIN CONTROLLED ARTIFICIAL LEGS

Presented by, K . ALHAF MALIK III-CSE

A . MAHADHEVAN III-CSE

BCIBrain computer interface.

It is a direct communication path way between a human brain or animal brain and external device.

BRAIN WAVESThere are four categories

Beta waves(15-40 c/sec)Alpha waves(9-14 c/sec)Theta waves(5-8c/sec)Delta waves(1.5-4c/sec)

Functions of Block diagram

ELECTRODE CAP

• It contains electrodes which are placed on the skull in an arrangement called 10-20 system.

• Main function of the electrode cap is to take the brain signals in the form of electrical signals

AMPLIFIER

Output signal from the electrode cap will be in the range of milli volt & microvolt

Hence there is a need for amplification

ADCOutput signals are analog in nature

So the signals are sent to ADC to convert the analog signals to the digital signals

SIGNAL PROCESSOR

Using the ouput signal from the a/d conv. Parameter extraction, pattern classification & pattern

identification are done. Then the signal is fed to FFT unit for simplifying the

calculations

MICROCONTROLLER UNIT

It performs the robotic operations with the help of stepper motor

It will control the operations like walking, running etc.

Appearance of artificial legs

POWER SUPPLY

• It uses Li-ion battery • It require to charge once in 2days• The life time will be longer when

compared to other batteries

DIFF. BETWEEN NORMAL AND DIFF. BETWEEN NORMAL AND BRAIN CONTROLLED ARTIFICIAL BRAIN CONTROLLED ARTIFICIAL

LEGSLEGSBrain Controlled Artificial LegsBrain Controlled Artificial Legs Normal Artificial LegsNormal Artificial Legs

1.1. Ease of ConstructionEase of Construction 1. Complex in construction1. Complex in construction

2.Cost is not more than Rs.5,00,0002.Cost is not more than Rs.5,00,000 2. Cost is about $80,000-2. Cost is about $80,000-$90,000(Rs.35,00,000 to Rs.40,00,000)$90,000(Rs.35,00,000 to Rs.40,00,000)

3.User can have full control over the 3.User can have full control over the artificial leg.artificial leg.

3. User cannot have full control over the 3. User cannot have full control over the artificial leg.artificial leg.

4.Semi-Automatic4.Semi-Automatic 4. Fully Automatic4. Fully Automatic

5.Sensors are absent.5.Sensors are absent. 5.Sensors are present5.Sensors are present

6.Requires simple control unit.6.Requires simple control unit. 6. Requires complex control unit.6. Requires complex control unit.

conclusion

• The performance of the proposed system will be better than the existing artificial legs

• With the system life can be made easier for the differently abled persons

QUERIES

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