Dibu
Published

Life Band - Health Assistant For Elderly

Life Band monitors the health conditions of elderly up to date and provide immediate medical assistance if necessary.

IntermediateFull instructions provided5 hours18,485
Life Band - Health Assistant For Elderly

Things used in this project

Hardware components

DPS310
Infineon DPS310
×1
Arduino Pro Mini 328 - 3.3V/8MHz
SparkFun Arduino Pro Mini 328 - 3.3V/8MHz
×1
PulseSensor
×1
HC-05 Bluetooth Module
HC-05 Bluetooth Module
×1
3.7 V LiPo Battery
×1

Software apps and online services

Arduino IDE
Arduino IDE
Blynk
Blynk

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
3d printer

Story

Read more

Custom parts and enclosures

LIFE BAND CASE -3D FILE

LIFE BAND TOP -3D FILE

Schematics

Circuit Diagram

Code

DPS310_SENSOR.ino

C/C++
In this code we use calibration in altitude because the altitude varies with place so ,what does the code is that it take 3 seconds for the calibration and take maximum and minimum altitude and save its.
//FOR DPS 310 PRESSURE SENSOR
#include <ifx_dps310.h>
const float sea_press = 1013.25; // DECLARING SEA LEVEL PRSSURE AS CONSTANT
int alttitude = 0;         // the sensor value
int minimumalttitude = 100000;        // minimum sensor value (changes after calibration)
int maximumalttitude = 0;           // maximum sensor value(changes after calibration)

 // FOR EMERGRNCY BUTTON
int buttonState = 0; // FOR EMERGENCY BUTTON
const int buttonPin = 4; //DIGITAL PIN 4 DECLARED AS EMERGENCY PI

// FOR HEARTBEAT SENSOR
int pulsePin = 0;                 // Pulse Sensor purple wire connected to analog pin 0
unsigned long previousMillis = 0;        // will store last time pulse sensor sensed
const long interval = 5000;           // interval at which pulse should be sensed
// Volatile Variables, used in the interrupt service routine!
volatile int BPM;                   // int that holds raw Analog in 0. updated every 2mS
volatile int Signal;                // holds the incoming raw data
volatile int IBI = 600;             // int that holds the time interval between beats! Must be seeded!
volatile boolean Pulse = false;     // "True" when User's live heartbeat is detected. "False" when not a "live beat".
volatile boolean QS = false;        // becomes true when Arduoino finds a beat.

// FOR BLYNK APP
#define BLYNK_USE_DIRECT_CONNECT
#include <SoftwareSerial.h>
SoftwareSerial DebugSerial(2, 3); // RX, TX FOR HC05 BLUETOOTH MODULES
#define BLYNK_PRINT DebugSerial
#include <BlynkSimpleSerialBLE.h>
 // You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YourAuthToken";  // GIVE YOUR BLYNK TOKEN HERE

void setup(){
pinMode(buttonPin, INPUT); //emergency pi declared as input
  Serial.begin(9600);             
  interruptSetup();                 // sets up to read Pulse Sensor signal every 2mS
   // IF YOU ARE POWERING The Pulse Sensor AT VOLTAGE LESS THAN THE BOARD VOLTAGE,
   // UN-COMMENT THE NEXT LINE AND APPLY THAT VOLTAGE TO THE A-REF PIN
  analogReference(3.3); //the voltage given to heartbeat sensor 
   while (!Serial);
  Wire.begin();


  //Call begin to initialize ifxDps310
  //The parameter 0x76 is the bus address. The default address is 0x77 and does not need to be given.
  ifxDps310.begin(Wire, 0x76);
  //Use the commented line below instead of the one above to use the default I2C address.
  //if you are using the Pressure 3 click Board, you need 0x76
  //ifxDps310.begin(&Wire);
  
  // IMPORTANT NOTE
  //If you face the issue that the DPS310 indicates a temperature around 60 C although it should be around 20 C (room temperature), you might have got an IC with a fuse bit problem
  //Call the following function directly after begin() to resolve this issue (needs only be called once after startup)
  //ifxDps310.correctTemp();

  Serial.println("Init complete!");
    calibration(); //calling calibration function beacause we cant fix a altitude because it varies every were
                   //so we calibrate the maximum altitude and minimum altitude for 3 seconds

      DebugSerial.begin(9600);

  // Blynk will work through Serial
  // 9600 is for HC-06. For HC-05 default speed is 38400
  // Do not read or write this serial manually in your sketch
  
  Blynk.begin(Serial, auth);
}


//  Where the Magic Happens
void loop(){
    Blynk.run();

  long int temperature;
  long int pressure;
  int oversampling = 7;
  int ret;
  Serial.println();

  //lets the Dps310 perform a Single temperature measurement with the last (or standard) configuration
  //The result will be written to the paramerter temperature
  //ret = ifxDps310.measureTempOnce(temperature);
  //the commented line below does exactly the same as the one above, but you can also config the precision
  //oversampling can be a value from 0 to 7
  //the Dps 310 will perform 2^oversampling internal temperature measurements and combine them to one result with higher precision
  //measurements with higher precision take more time, consult datasheet for more information
  ret = ifxDps310.measureTempOnce(temperature, oversampling);

  if (ret != 0)
  {
    //Something went wrong.
    //Look at the library code for more information about return codes
    Serial.print("FAIL! ret = ");
    Serial.println(ret);
  }
  else
  {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" degrees of Celsius");
  }
  if(temperature > 40) //                       CHEcking body temperatrue
  {                                             //you should degin the case as per the sensor touches the skin else there is no use for this checking
    Serial.println("temperature rise");
  Blynk.email("your_email@mail.com", "subject :temperature rise is noticed ", "your randma/grandpa 's temperature has increased beyond normal value"); // provide your email id
  }

  //Pressure measurement behaves like temperature measurement
  //ret = ifxDps310.measurePressureOnce(pressure);
  ret = ifxDps310.measurePressureOnce(pressure, oversampling);
  if (ret != 0)
  {
    //Something went wrong.
    //Look at the library code for more information about return codes
    Serial.print("FAIL! ret = ");
    Serial.println(ret);
  }
  else
  {
    Serial.print("Pressure: ");
    Serial.print(pressure);
    Serial.println(" Pascal");
  }

  float getaltitude=(((pow((sea_press/(pressure)), 1/5.257) - 1.0)*(temperature +273.15)))/0.0065; //hypsometric formula to covert presure and temperature of a region to altitude
 
 Serial.print(getaltitude);  //print the obtained altitude
 
    if(alttitude < (maximumalttitude - .5)) //if calibrated MAXIMUM alttitude is 3M. IF a SUDDEN FALL OCCURS WHCIH IS LESS THAN 2.5M (maximumalttitude - .5)  THEN WE CAN ASSUME A FALL OCCURS
    {                                       // we take a diiference of .5 meter decrement as falling situation. you can change as per your need
                                            // if you need to send the BPM rate coreesponding to this time you can add it in the email option
     Serial.println("alttitude drop");
  Blynk.email("your_email@mail.com", "subject :alttitude drop occurs ", "your randma/grandpa 's mAY fall down and required assistance"); // provide your email id
    }
    
    if(alttitude  > (maximumalttitude + 1)) //if calibrated MAXIMUM alttitude is 3M IF a rise occurs more than 1 METER  which means cmlimbing up 
   
    { 

Serial.println("alttitude rise");
  Blynk.email("your_email@mail.com", "subject :alttitude rise occurs ", "your randma/grandpa 's climbing up a ladder or something "); // provide your email id
   
    }

   
    
 unsigned long currentMillis = millis();
 if (currentMillis - previousMillis >= interval) // sense heart beat at every 5 second intervel you can change as per your need
 {
  
    while (millis() < (currentMillis + 3000)) // calibration time you can change it as per your need
   {
   
  if (QS == true){     // A Heartbeat Was Found
                       // BPM and IBI have been Determined
                       // Quantified Self "QS" true when arduino finds a heartbeat
   
       
        QS = false;                      // reset the Quantified Self flag for next time
  }}
  Serial.println(" . ");
Serial.println(BPM);
Serial.println("  .");
  //delay(20); //  take a break
  unsigned long currentMillis = millis();
   previousMillis = currentMillis;
  
}
 buttonState = digitalRead(buttonPin); //reading emergency button state
 
   if (buttonState == HIGH) //CHECKING THE EMERGENCY BUTTON STATE
   {
 
  Serial.println("emergency button pressed"); 
  //if pressed emergency email is sending 
  Blynk.email("your_email@mail.com", "subject :emergency case ", "your grandma/grandpa has pressed emergency button he/she need assistance now immediate"); // provide your email id
  }
  
if (BPM<60 || BPM>80) // CHECKING BLOOD PRESSURE
 {  Serial.println("drastic change in blood pressure");
  Blynk.email("your_email@mail.com", "subject :need immediate attenion", "drastic change in blood prssure has been sensed please provide immediate assistance"); // provide your email id
  //you can also include the BPM rate along with the mail if you need
}
} 

void calibration() //we canot fix a height because its changes with location so we calibrate the HEIGHT for 3 seconds
{
   while (millis() < 3000) // calibration time you can change it as per your need
   {

 long int temperature;
  long int pressure;
  int oversampling = 7;
  int ret;
   ret = ifxDps310.measureTempOnce(temperature, oversampling);
  ret = ifxDps310.measurePressureOnce(pressure, oversampling);

    float getaltitude=(((pow((sea_press/(pressure/10)), 1/5.257) - 1.0)*(temperature +273.15)))/0.0065; //hypsometric formula
    alttitude = getaltitude;

    // record the maximum altitude value
    if (alttitude > maximumalttitude) {
      maximumalttitude = alttitude;
    }

    // record the minimum altitue value
    if (alttitude < minimumalttitude) {
      minimumalttitude = alttitude;
    }
    }   Serial.println("");
    Serial.print(maximumalttitude);
    Serial.print(" -- maximumalttitude");
     Serial.println("");
      Serial.print(minimumalttitude);
    Serial.print("  --minimumalttitude");
    Serial.println("");
    
}

//THIS ARE INTERPTS CODE FOR PULSE SENSOR

volatile int rate[10];                    // array to hold last ten IBI values
volatile unsigned long sampleCounter = 0;          // used to determine pulse timing
volatile unsigned long lastBeatTime = 0;           // used to find IBI
volatile int P =512;                      // used to find peak in pulse wave, seeded
volatile int T = 512;                     // used to find trough in pulse wave, seeded
volatile int thresh = 530;                // used to find instant moment of heart beat, seeded
volatile int amp = 0;                   // used to hold amplitude of pulse waveform, seeded
volatile boolean firstBeat = true;        // used to seed rate array so we startup with reasonable BPM
volatile boolean secondBeat = false;      // used to seed rate array so we startup with reasonable BPM


void interruptSetup(){  // CHECK OUT THE Timer_Interrupt_Notes TAB FOR MORE ON INTERRUPTS 
  // Initializes Timer2 to throw an interrupt every 2mS.
  TCCR2A = 0x02;     // DISABLE PWM ON DIGITAL PINS 3 AND 11, AND GO INTO CTC MODE
  TCCR2B = 0x06;     // DON'T FORCE COMPARE, 256 PRESCALER
  OCR2A = 0X7C;      // SET THE TOP OF THE COUNT TO 124 FOR 500Hz SAMPLE RATE
  TIMSK2 = 0x02;     // ENABLE INTERRUPT ON MATCH BETWEEN TIMER2 AND OCR2A
  sei();             // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED
}


// THIS IS THE TIMER 2 INTERRUPT SERVICE ROUTINE.
// Timer 2 makes sure that we take a reading every 2 miliseconds
ISR(TIMER2_COMPA_vect){                         // triggered when Timer2 counts to 124
  cli();                                      // disable interrupts while we do this
  Signal = analogRead(pulsePin);              // read the Pulse Sensor
  sampleCounter += 2;                         // keep track of the time in mS with this variable
  int N = sampleCounter - lastBeatTime;       // monitor the time since the last beat to avoid noise

    //  find the peak and trough of the pulse wave
  if(Signal < thresh && N > (IBI/5)*3){       // avoid dichrotic noise by waiting 3/5 of last IBI
    if (Signal < T){                        // T is the trough
      T = Signal;                         // keep track of lowest point in pulse wave
    }
  }

  if(Signal > thresh && Signal > P){          // thresh condition helps avoid noise
    P = Signal;                             // P is the peak
  }                                        // keep track of highest point in pulse wave

  //  NOW IT'S TIME TO LOOK FOR THE HEART BEAT
  // signal surges up in value every time there is a pulse
  if (N > 250){                                   // avoid high frequency noise
    if ( (Signal > thresh) && (Pulse == false) && (N > (IBI/5)*3) ){
      Pulse = true;                               // set the Pulse flag when we think there is a pulse
      
      IBI = sampleCounter - lastBeatTime;         // measure time between beats in mS
      lastBeatTime = sampleCounter;               // keep track of time for next pulse

      if(secondBeat){                        // if this is the second beat, if secondBeat == TRUE
        secondBeat = false;                  // clear secondBeat flag
        for(int i=0; i<=9; i++){             // seed the running total to get a realisitic BPM at startup
          rate[i] = IBI;
        }
      }

      if(firstBeat){                         // if it's the first time we found a beat, if firstBeat == TRUE
        firstBeat = false;                   // clear firstBeat flag
        secondBeat = true;                   // set the second beat flag
        sei();                               // enable interrupts again
        return;                              // IBI value is unreliable so discard it
      }


      // keep a running total of the last 10 IBI values
      word runningTotal = 0;                  // clear the runningTotal variable

      for(int i=0; i<=8; i++){                // shift data in the rate array
        rate[i] = rate[i+1];                  // and drop the oldest IBI value
        runningTotal += rate[i];              // add up the 9 oldest IBI values
      }

      rate[9] = IBI;                          // add the latest IBI to the rate array
      runningTotal += rate[9];                // add the latest IBI to runningTotal
      runningTotal /= 10;                     // average the last 10 IBI values
      BPM = 60000/runningTotal;               // how many beats can fit into a minute? that's BPM!
      QS = true;                              // set Quantified Self flag
      // QS FLAG IS NOT CLEARED INSIDE THIS ISR
    }
  }

  if (Signal < thresh && Pulse == true){   // when the values are going down, the beat is over
  
    Pulse = false;                         // reset the Pulse flag so we can do it again
    amp = P - T;                           // get amplitude of the pulse wave
    thresh = amp/2 + T;                    // set thresh at 50% of the amplitude
    P = thresh;                            // reset these for next time
    T = thresh;
  }

  if (N > 2500){                           // if 2.5 seconds go by without a beat
    thresh = 530;                          // set thresh default
    P = 512;                               // set P default
    T = 512;                               // set T default
    lastBeatTime = sampleCounter;          // bring the lastBeatTime up to date
    firstBeat = true;                      // set these to avoid noise
    secondBeat = false;                    // when we get the heartbeat back
  }

  sei();                                   // enable interrupts when youre done!
}// end isr

Credits

Dibu

Dibu

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