bioelectric fat analyser
TRANSCRIPT
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Bioelectric Fat Analyzer
Presented by
P.Sandeep Reddy
B.Santhosh Naik
K.Venkata Rajesh
Guide: Mr.Vennala Kishore Assistant Professor
(Dept of ECE) BVRIT
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Presentation Outline
Introduction Hardware used Flow Chart Block diagram Working Existing methods Implementation and Result Future Scope Conclusion
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Introduction
• Weight alone is not a clear indicator of good health because it does not distinguish fat and body mass.
• Obesity means an excess of body fat regardless of weight.
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Principle
Bioelectric Impedance Analysis
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Hardware Procured
• AT89C52• ADC0809• 16*2 Character LCD• Step Down Transformer (Centre Tapped)• External Clock Generator• 12 MHz Crystal Oscillator • Power Supply Circuit• Keypad 4*3• Copper Electrodes
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F Flow ChartStart
Accept Inputs (Age, weight)
Adjust Body Peripheral Length
Set electrodes
Apply constant current electrodes
Calculate fat free mass
Calculate body fat by substituting weight , age ,
voltage in regression equation
Set body length by replacing each pair of
electrodes
Find the potential Difference
Calculate body percentage
Display result on LCD Screen
EndNo
Yes
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Block Diagram
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Working
The measurement is taken when the electrodes are placed at the wrist and the contra lateral ankle.
By injecting an AC current of the order 10uA through one’s body and measuring the voltage across the electrodes and finding instantaneous impedance.
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Enter the Age and Weight of the user. Percentage of the Body’s Fat is Calculated by
regression equations.
Males: Bodyfat = 0.0923*weight + 0.1605*age - 0.0263*voltageFemales: Bodyfat = 0.1871*weight + 0.5800*age – 0.0920*voltage
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Existing Methods
DEXA (Dual-energy X-ray Absorptiometry) Scan
Underwater Weighing Bod Pod (Whole Body Plethysmography) Skinfold Measurements
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Implementation and Result
Step 1: Switch ON the Power Supply Circuit
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Step 2: The message “Hold Electrodes” on the 16*2 Character LCD gets displayed.
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Step 3:: On seeing the message “Hold Electrodes” on the LCD display, hold it with two figures of your hand as shown in below picture
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Step 4: Enter the weight and age of the user using 4*3 keypad present in the Kit and press Go key. After a message “Please enter 1 for MALE or 2 for FEMALE gets displayed” on the display, Enter 1 if the user is 1 or enter 2 if female and press Go key.
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Step 5: Fat percentage of the User gets displayed on the LCD screen.
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Advantages
Measuring body’s fat with this method is much easier than compared to any other method.
Can be used in any environmental conditions.
Much of reasonable cost.
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Future Scope
One extension would be to improve accuracy by implementing multi-frequency bioimpedance analysis.
Another possible extension would be miniaturize the device and making it portable.
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Conclusion
For our accuracy goal, we were able to achieve body fat prediction within a 10% error margin for subjects matching our test samples, but we had poor accuracy outside that fairly specific range of weights and body compositions
The device operated at a safe current and did not harm any of our test subjects. Our input signal to the user is approximately 12 μA, which is quite close to our goal of 10 μA, and is still safe to pass through a user’s body mass.
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Thank you