body fat monitor body impedance measuring roger tsai apr 25, 2007
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Body Fat MonitorBody Impedance Measuring
Roger TSAI
Apr 25, 2007
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Something about Roger (his friend)
Before After
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Why Measuring Body Fat?
• Same weight as Michael Jordan? How’bout body fat?– Height 6 ft 6 in (1.98 m)
– Weight 216 lb (98 kg)
• Health Indicator– Prevent from blood related disease
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Product Information• Manufacturer: Tanita
• Price: $30
• Function: – Measuring weight
– Measuring body fat
– Two user memory set
– Unit: Lb or kg
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How to use it (1)Setting:
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How to use it (2)• Switch on and get on !
– (take off your sox first)
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Health Standard
Male
Female
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How it works electrically
• Theory of BIA (Bioelectrical Impedance Analysis)
– Shots an electron into one side or your body and receive it from the other
side
– Fat generate more resistance(impedance) than muscle do
– BIA: Calculate fat percentage of your body by data of your gender, age,
height, and weight.
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What it senses(1)
• Weight – Use balance bridge, malleable metal,
and flex sensor to calculate your weight
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What it senses(1)
• Comparing with other weight scale– http://www.howstuffworks.com/inside-scale.htm
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What it senses(2)• Impedance
– Shooting electron from left side of food pad, and receive electron from right side.– Measure voltage difference to between two sides.
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Data Sheet
• Not much info on data sheet
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PCBLED monitor
Connect toUnit switch
Speaker
Connect topower
Connect toFoot pad
Connect to flex sensor
Up Memory DownButtons:
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Wiring
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Micro controller
NEC SGP (for LCD)
BU4052BCF Dual 4-channel analog multiplexer
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Data Value
• Voltage
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Availability
• Availability:
– Domestic merchandise, e.g. Bed, Bath, and Beyond
– Pharmacy, e.g. Duane Read
– Internet, e.g. eBay
• Cost:– Price Range: $30~$100
• Industry links:– http://www.tanita.com/
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What’s Next
• Advance version of body fat monitor
• Further application