FitNex

A smart device to calculate your BMI, TBW and ideal water consumption for better health.

IntermediateFull instructions provided10 hours662

Things used in this project

Hardware components

Texas Instruments MSP-EXP430G2 MSP430 LaunchPad

HC-05 Bluetooth Module

SparkFun Load Cell Amplifier - HX711

Software apps and online services

Texas Instruments Energia

MIT App Inventor

Google Firebase

Story

Aim:

To Create a BMI Machine which can be used to calculate BMI, TBW and Ideal Daily water Consumption by measuring weight of the user and taking other relevant parameters as input.
Objective is to make it easier for everyone to calculate their BMI and TBW so that they can keep a check on their Health.

H/Wused:

MSP430 Launchpad from TI: used to connect modules and take input and send it to necessary module
HC05 Bluetooth Module: used to connect hardware to mobile
Weighing scale/Load Cell: Used to measure Weight of the user
HX711 IC: used to take data from load cell and transfer it to launchpad

Block Diagram

3D - Model for Casing

S/Wused:

Energia: For programming the MSP430 Launchpad
MIT App Inventor: To make the mobile application
Firebase: To take data from app and store in a database
123D Design: To make the casing of the hardware

working:

User is supposed to measure his/her weight and enter the relevant parameters showing in the mobile application.

1. First the weight is measured using load cell.

2. The Data is then sent to the MSP430 Launchpad through HX711 IC.

3. Then from Launchpad the Data is sent to mobile Application through bluetooth module HC05.

4. Computation of results is done in application itself and results are shown to the users.

5. The data (parameters and results) are sent to database for future usage and analysis.

User Manual:

First the User must Sign Up on the App
After Signing Up once User can then Log in.
Their are two section : One for BMI and one for TBW
For each section Weight can be measured after connecting bluetooth.
Weight will be measured and other relevant information is to be given by the user.
After clicking calculate the Result will be printed on the screen.

Application:

Everyone who wants to keep a check on their Health they can do so by checking the following Indices provided by our Product:

1. BMI- Body Mass Index

2. TBW- Total Body Water

3. Ideal Daily Water Consumption

BMI.ino

#include "HX711.h"

// HX711.DOUT	- pin #A1
// HX711.PD_SCK	- pin #A0

HX711 scale(12, 11);		// parameter "gain" is ommited; the default value 128 is used by the libra
char rec;
void setup() {
  Serial.begin(9600);
  //Serial.println("HX711 Demo");

  //Serial.println("Before setting up the scale:");
  //Serial.print("read: \t\t");
  scale.read();//Serial.println(scale.read());			// print a raw reading from the ADC

  //Serial.print("read average: \t\t");
  scale.read_average(20);//Serial.println(scale.read_average(20));  	// print the average of 20 readings from the ADC

  //Serial.print("get value: \t\t");
  scale.get_value(5);//Serial.println(scale.get_value(5));		// print the average of 5 readings from the ADC minus the tare weight (not set yet)

  //Serial.print("get units: \t\t");
  //Serial.println(scale.get_units(5), 1);	// print the average of 5 readings from the ADC minus tare weight (not set) divided 
						// by the SCALE parameter (not set yet)  

  scale.set_scale(2280.f);                      // this value is obtained by calibrating the scale with known weights; see the README for details
  scale.tare();				        // reset the scale to 0

  //Serial.println("After setting up the scale:");

  //Serial.print("read: \t\t");
  scale.read();//Serial.println(scale.read());                 // print a raw reading from the ADC

  //Serial.print("read average: \t\t");
  scale.read_average(20);//Serial.println(scale.read_average(20));       // print the average of 20 readings from the ADC

  //Serial.print("get value: \t\t");
  scale.get_value(5);//Serial.println(scale.get_value(5));		// print the average of 5 readings from the ADC minus the tare weight, set with tare()

  //Serial.print("get units: \t\t");
  //Serial.println(scale.get_units(5), 1);        // print the average of 5 readings from the ADC minus tare weight, divided 
						// by the SCALE parameter set with set_scale

 // Serial.println("Readings:");

}

void loop() 
{
  //Serial.print("one reading:\t");
  //Serial.print(scale.get_units(), 1);
  //Serial.print("\t| average:\t");
  if(Serial.available()>0)
  {
    rec = Serial.read();
    if(rec == 'A')  /* If data is available on serial port */
    {
      Serial.println(scale.get_units(10)/10);
      scale.power_down();			        // put the ADC in sleep mode
      delay(4000);
      scale.power_up();
    }
  }
}