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•The body mass index (BMI), or Quetelet index, is an approximate assumption for human body fat based
on an individual's weight and height
•It was invented between 1830 and 1850 by the Belgian polymath Adolphe Quetelet during the course
of developing "social physics“
•BMI provided a simple numeric measure of a person's "fatness" or "thinness", allowing health professionals
to discuss over- and under-weight problems more objectively with their patients
It can be used to build a semi-accurate representation from which a solution can be stipulated, or the Recommended Dietary Allowance (RDA) for a group can be calculated.
BMI has been used by the WHO as the standard for recording obesity statistics since the early 1980s.
It is also used as a measure of underweight, owing to advocacy on behalf of those suffering with eating disorders, such as anorexia nervosa and bulimia nervosa.
i. POWER SUPPLY.o +/- 15V DCo + 5V DCo +2V DC
ii. Sensorso Load Cell (CZL-642-200Kg)o Ultrasonic Displacement Measurement Sensor
iii. Microcontroller (8051)o A.D.C. Interfacing
o Signal Conditioningo L.C.D. Interfacing
Load Cell.Output range of load cell matches with our
ADC requirements.(0-5V) It is easily available in the market.Cost EffectiveSimple Connections
Ultrasonic Sensor.Accurate up to 1cm.Output is easily interfaced with the
microcontroller.Faster Speed of operation.
Load CellExcitation
Vltg=15V,5V
Ultrasonic Sensor
Actual Wt. Output Volt.
15V 5V
200kg 30mv 10mv
64kg (Sol) 9.6mv 3.2mv
72kg(Utkarsh)
10.8mv 3.6mv
2.6Kg(Laptop)
0.8mv 0.27mv
Actual Distance
Echo Time
400 cm 23.529ms
170 (Sol) 10 ms
182 (Sumeet) 10.7 ms
1. Get the input from the ultrasonic sensor2. Get the input from the load cell
1. Amplify the signal from the load cell so as to interface with the ADC.
3. Calculate B.M.I. using the formula4. If B.M.I. > 25 then
1. Display Overweight for men & women
5. If B.M.I. < 18 then1. Display Underweight for men & women
6. If B.M.I. is between 18-20 then1. Display normal for women & under weight for men
7. If B.M.I. is between 20-25 then1. Display over weight for women and normal for
men
8. Reset the program and back to step 1.
Start
Get Input from Sensors to
Microcontroller
Calculate B.M.I. from the formula
Display the output according
to the B.M.I. table.
Reset the circuit.
B.M.I Result
>25 Over for both
<18 Under for both
18-20 Normal-Women Under- Men
20-25 Normal-Men Over-Women