•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