Automatic BMI Measurement System using Arduino

Description

#Smart BMI Monitor using Arduino and Sensor 
#Contactless Height & Weight Based BMI Calculator

Introduction 

Body Mass Index (BMI) is the most widely used parameter to measure the health of a person and verify whether he/she is underweight, normal, overweight, or obese based on weight in relation to height. Traditional methods of calculating BMI are manual measurement and calculation, which can lead to inaccuracies and inefficiency, especially in public or clinical settings. This project demonstrates the principles and operation of an Automatic BMI Measuring Machine with Arduino, using an ultrasonic sensor for non-touch measurement of height and load cell with HX711 amplifier for accurate measurement of weight.

The height of the individual is calculated first by using the ultrasonic sensor placed above. The height is then obtained by subtracting the distance read from the fixed sensor height. In the meantime, the individual stands on a load cell embedded platform to determine his weight. The BMI is calculated by the Arduino microcontroller by the formula:

BMI = Height(m) / Weight (kg)

The final BMI reading is shown on an LCD screen together with the corresponding health class (e.g., Underweight, Normal, Overweight, Obese). The device is inexpensive, compact, and easy to use and is appropriate for application in health kiosks, schools, exercise facilities, clinics, and rural health facilities. The device promotes health metrics awareness and can be used to provide the early identification of body-weight-related health risks.

📈 BMI Health Categories (for reference):

• BMI < 18.5 → Underweight
• 18.5 ≤ BMI < 24.9 → Normal
• 25.0 ≤ BMI < 29.9 → Overweight
• BMI ≥ 30.0 → Obese

Objectives

• To design and develop an automatic BMI measuring machine using Arduino.

• To accurately measure the height using an ultrasonic sensor.

• To measure the body weight using a load cell and HX711 amplifier.

• To calculate and display the BMI on a 16×2 or 20×4 LCD.

• To promote awareness about healthy BMI ranges in public.

Block Diagram

                                               Block Diagram : Automatic BMI Measurement System using Arduino

Hardware Required

1. Arduino UNO
2. Ultrasonic Sensor (HC-SR04)
3. Load Cell (100 Kg)
4. HX711 Weight Sensor Amplifier
5. LCD 20×4
6. Jumper wires
7. Wooden / Acrylic platform
8. Power Supply / Battery

​Software Required

Arduino IDE

Working Principle:

1. Ultrasonic Sensor: Uses echo-time to determine distance from head to sensor.

2. Load Cell + HX711: Measures the actual weight when a person steps on.

3. Arduino: Reads both sensor inputs, computes height in meters and weight in kg, then applies the BMI formula.

4. LCD Display: Shows the weight, height, and final BMI result.

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🔷 Project Title Ideas for this project :

1. Automatic BMI Measurement System using Arduino and Sensors

2. Smart Body Mass Index Calculator with Ultrasonic and Load Cell Sensors

3. Contactless BMI Machine using Arduino and HC-SR04

4. Intelligent BMI Calculator using Arduino and Weight Sensor

5. Digital BMI Checker using Ultrasonic Sensor and Load Cell

6. Arduino-based Body Mass Index Measuring Device

7. Portable BMI Monitoring System using Microcontroller

8. Smart Health Kiosk for BMI Detection using Arduino

9. BMI Calculator with Automatic Height and Weight Detection

10. Touchless BMI Machine using Ultrasonic and HX711 Weight Sensor

#Arduino-based Digital BMI Indicator #Portable BMI Screening Device using Load Cell and Ultrasonic Sensor #Health Monitoring System: Automatic BMI Measurement #BMI Assessment Machine with Recommended Ideal Weight