Dejan Volk / Mbed 2 deprecated HeartBeatMonitor

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Dependencies:   mbed

main.cpp@0:a0204dfc42fd, 2010-09-09 (annotated)

Committer:
dejan_volk
Date:
Thu Sep 09 15:43:12 2010 +0000
Revision:
0:a0204dfc42fd

        

        
Who changed what in which revision?

        

            
                
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/*





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Heart Beat Monitor v1.0 w/ BlueBeat(Java-based program for mobile phones) & BlueBeat for PC





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Authors: Dejan Volk & Blaz Magdic





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3rd grade of Computer Science, Faculty of Electrical Engineering and Computer Science





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Maribor, Slovenia





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Used for sending information about heart beats per minute to the mobile phone via





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Bluetooth module WT11-A-AI made by Bluegiga.





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Description of pins used:





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p5 - RESET switch for Polar's RMCM01 OEM module





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p8 - RESET switch on WT11





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p9 - TX for communicating with WT11





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p10 - RX for communicating with WT11





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p11 - DigitalIn for Polar's RMCM01 OEM module (pin HR)





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p12 - DigitalIn for Polar's RMCM01 OEM module (pin FPLS)





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Possible improvements:





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- Integrating a LCD monitor that will use the serial port to display information about the current heart beat





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- Implementing a more efficient algorithm to calculate the heart beat





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- Better code comments (doh)





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*/





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#include "mbed.h"





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//************global declarations*****************





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Serial s_port(p9,p10);





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DigitalOut led_yes(LED1); //visual indicator for sending data to WT11





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DigitalOut reset(p8);  //reset trigger on WT11





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DigitalOut reset_RMCM(p5);    //reset trigger on RMCM01





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InterruptIn heartBeat(p12);





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Timer timer;





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int interval;    //interval between heartbeats





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int intrHB;      //heartbeats per minute





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int baud_rate = 115200;





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int bits = 8;





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int stop_bits = 1;





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int counter_HB = 0;





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int array[3];        //small array for storing heart beats





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bool intrPin = false;





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int previous = 11;    //variable that stores the previously calculated heartbeat





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//***********end of global declarations*************





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void initWT11() {       //init function for initial configuration of WT11 module





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    int zero = 0;





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    int high = 1;





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    reset.write(zero); //Initializing WT11 for inputting commands





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    wait(0.2);





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    reset.write(high);





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    wait(0.01);





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    reset.write(zero);





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    wait(2);





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    //Configuration for WT11 - setting it to slave mode





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    s_port.printf("SET BT PAGEMODE 3 2000 1\n");





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    s_port.printf("SET BT NAME HBMWT11\n");





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    s_port.printf("SET BT ROLE 0 f 7d00\n");





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    s_port.printf("SET CONTROL ECHO 0\n");





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    s_port.printf("SET BT AUTH * 1234\n");





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    s_port.printf("SET CONTROL ESCAPE 43 00 0\n");





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    s_port.printf("SET CONTROL CD 00 0\n");





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    s_port.printf("SET CONTROL BAUD 115200,8n1\n");





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}





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void initRMCM() { //init function for initial configuration of RMCM01





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    int zero = 0;





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    int high = 1;





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    reset_RMCM.write(high);





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    wait(0.1);





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    reset_RMCM.write(zero);





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    wait(0.1);





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    reset_RMCM.write(high);





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}





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void intrTrigRise() {





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    led_yes=1;    //triggering the indicator led





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    interval=timer.read_ms();    //reads the interval





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    timer.stop();





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    timer.reset();          //resets the timer





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    timer.start();          //starts the timer





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    intrPin = true;        //sets the interrupt to true





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    heartBeat.mode(PullNone);





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    wait(0.29);





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    heartBeat.mode(PullUp);





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}





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void interpolation() {





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    if (interval != 0) {  //avoiding divide-by-zero error





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        array[counter_HB] = interval;





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        counter_HB++;





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        led_yes=0;





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        if (counter_HB == 3) {     //when the array is full, start calculating the average heartbeat





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            counter_HB = 0;





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            int minute = 60000;





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            int avrg = 0;





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            int temp = 0;





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            int flag = 1;





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            int avg = 0;





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            for (int i = 1; i <= 3 && flag; i++) {    //bubble sort in descending order





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                flag = 0;





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                for (int j = 0; j < 2; j++) {





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                    if (array[j+1] > array[j]) {





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                        temp = array[j];





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                        array[j] = array[j+1];





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                        array[j+1] = temp;





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                        flag = 1;





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                    }





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                }





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            }





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            int sum1 = (60000/array[0]) - (60000/array[1]);        //taking the middle value and calculate the difference





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            int sum2 = (60000/array[2]) - (60000/array[1]);        //between both remaining values





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            if ((sum1 >= -10 || sum1 <= 10) || (sum2 >= -10 || sum2 <= 10)) {        //if all values do not deviate by +/- 10 heart beats





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                for (int i = 0; i < 3; i++) {                                        //then take all 3 and calculate the average





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                    avrg+=array[i];





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                }





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                avg = avrg/3;





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            } else if ((sum1 >= -10 || sum1 <= 10) || (sum2 > 10 || sum2 < -10)) { //if 2nd sum deviates for more than +/- 10 heartbeats





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                avrg = array[0] + array[1];                                        //take the elements of 1st sum





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                avg = avrg/2;





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            } else if ((sum1 < -10 || sum1 > 10) || (sum2 <= 10 || sum2 >= -10)) { //if 1st sum deviates for more than +/- 10 heartbeats





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                avrg = array[2] + array[1];                                        //take the elements of 2nd sum





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                avg = avrg/2;





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            } else {





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                avg = previous;        //if all 3 values deviate for more than -/+ 10 heart beats, discard all and show the previous 





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            }                          //"good" heartbeat





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            intrHB = minute/avg;    //interpolating the interval to 1 min





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            intrPin = false;            //setting the interrupt to false





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            s_port.printf("#%i*",intrHB);





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            previous = avg;





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        }





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        intrPin = false;





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    } else





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        intrPin=false;





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}





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int main() {





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    initRMCM();                            //calling init function for RMCM01





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    s_port.baud(baud_rate);





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    s_port.format(bits,Serial::None,stop_bits);





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    initWT11();                         //calling the init function for setting WT11





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    s_port.printf("SELECT 0\n");        //switching from COMMAND mode to DATA mode





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    while (1) {





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        heartBeat.rise(&intrTrigRise);    //trigger for interrupt





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        if (intrPin == true && interval != 0) {  //if interrupt is true and interval is not 0, send data





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            interpolation();





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        }





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    }





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}