Jasper Sikken / Mbed 2 deprecated HeartRate

This program displays heart rate and time between heart beats on LCD, prints it to a USB serial port, print it to a bluetooth serial port and store it on a USB mass storage device. The program has two interrupt routines: 1.Every 1ms a counter is increased with one, 2. On every heart beat the counter is value copied. In the main loop the beats per minute are calculated. Ext.Modules:- Polar RMCM-01 heart rate module connected to pin8. - 2x16 LCD - a RF-BT0417CB bluetooth serial device connected to p27 and p28 - an USB mass storage device

Dependencies:   TextLCD mbed

main.cpp@2:e660e68a91fa, 2011-01-04 (annotated)

Committer:
jrsikken
Date:
Tue Jan 04 21:33:59 2011 +0000
Revision:
2:e660e68a91fa
Parent:
1:8b001f936bb0 
Now the heart rate is also send over a serial port to a bluetooth device.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jrsikken 2:e660e68a91fa 1 // This program displays heart rate and time between heart beats on LCD, prints it to a USB serial port,
jrsikken 2:e660e68a91fa 2 // print it to a bluetooth serial port and store it on a USB mass storage device.
jrsikken 2:e660e68a91fa 3 // The program has two interrupt routines:
jrsikken 2:e660e68a91fa 4 // 1.Every 1ms a counter is increased with one,
jrsikken 2:e660e68a91fa 5 // 2. On every heart beat the counter is value copied.
jrsikken 2:e660e68a91fa 6 // In the main loop the beats per minute are calculated.
jrsikken 2:e660e68a91fa 7
jrsikken 2:e660e68a91fa 8 // Ext.Modules:- Polar RMCM-01 heart rate module connected to pin8.
jrsikken 2:e660e68a91fa 9 // - 2x16 LCD
jrsikken 2:e660e68a91fa 10 // - a RF-BT0417CB bluetooth serial device connected to p27 and p28
jrsikken 2:e660e68a91fa 11 // - an USB mass storage device
jrsikken 0:939617e180e8 12
jrsikken 0:939617e180e8 13 #include "mbed.h"
jrsikken 0:939617e180e8 14 #include "TextLCD.h"
jrsikken 1:8b001f936bb0 15 #include "MSCFileSystem.h"
jrsikken 1:8b001f936bb0 16 #define FSNAME "msc"
jrsikken 1:8b001f936bb0 17 MSCFileSystem msc(FSNAME);
jrsikken 0:939617e180e8 18
jrsikken 1:8b001f936bb0 19 Timer t; // counts the time from beginning of main loop
jrsikken 2:e660e68a91fa 20 InterruptIn beat(p8); // beat is the name for a interrupt on pin 8
jrsikken 0:939617e180e8 21 TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d0-d3
jrsikken 1:8b001f936bb0 22 Ticker mscnt; // this is used to create a ms counter
jrsikken 2:e660e68a91fa 23 Serial bt(p28, p27); // tx, rx of the bluetooth serial COM port
jrsikken 0:939617e180e8 24
jrsikken 2:e660e68a91fa 25 int count,CNT,displayBPMFlag;//initialize global variables
jrsikken 0:939617e180e8 26
jrsikken 2:e660e68a91fa 27 void ms_counter() { //this interrupt routine starts every 1ms
jrsikken 1:8b001f936bb0 28 count++; //the counter is increased with 1
jrsikken 2:e660e68a91fa 29 if (count>1999) { //when no heart beat is detected for >2sec, then display "-" in the main loop
jrsikken 0:939617e180e8 30 CNT=count; // copy counter value to CNT
jrsikken 0:939617e180e8 31 displayBPMFlag = 1; // set flag that the BPM can be put to LCD in the main loop
jrsikken 0:939617e180e8 32 count=0; // reset counter value
jrsikken 0:939617e180e8 33 }
jrsikken 0:939617e180e8 34 }
jrsikken 0:939617e180e8 35
jrsikken 0:939617e180e8 36 void flip() { //this interrupt routine starts on every heart beat
jrsikken 0:939617e180e8 37 CNT = count; // copy counter value to CNT
jrsikken 0:939617e180e8 38 count = 0 ; // reset counter value
jrsikken 0:939617e180e8 39 displayBPMFlag = 1; // set flag that the BPM can be put to LCD in the main loop
jrsikken 0:939617e180e8 40 }
jrsikken 0:939617e180e8 41
jrsikken 0:939617e180e8 42 int main() {
jrsikken 2:e660e68a91fa 43 int BPM; //initialize BPM locally
jrsikken 2:e660e68a91fa 44 lcd.cls(); //clear the lcd display
jrsikken 2:e660e68a91fa 45 lcd.locate(0,0); //set cursor to first character and first line
jrsikken 2:e660e68a91fa 46 lcd.printf("Heart Rate"); //display the time in ms on the lcd
jrsikken 2:e660e68a91fa 47 lcd.locate(0,1); //set cursor to first character and second line
jrsikken 2:e660e68a91fa 48 lcd.printf("Jasper Sikken"); //display the beats per minute on the lcd
jrsikken 2:e660e68a91fa 49 wait_ms(2000);
jrsikken 2:e660e68a91fa 50 mscnt.attach_us(&ms_counter,1000); //the address of the function to be attached (ms_counter) and the interval (1ms)
jrsikken 2:e660e68a91fa 51 printf("0 \r\n"); //print 0 ms to the serial port
jrsikken 2:e660e68a91fa 52 bt.printf("0 \r\n"); //print 0 ms to the bluetooth serial port
jrsikken 2:e660e68a91fa 53 FILE *fp=fopen("/msc/HR.txt","a+");//Open file on USB Mass Storage device, 8.3 filesystem, open for write and append
jrsikken 2:e660e68a91fa 54 if (fp==NULL)error("Could not open file for write\n");// error code
jrsikken 2:e660e68a91fa 55 fprintf(fp,"0,0 \r\n"); //write "0,0" to file to indicate beginning of a measurement
jrsikken 2:e660e68a91fa 56 fclose(fp); //close file
jrsikken 2:e660e68a91fa 57 lcd.cls(); //clear the lcd display
jrsikken 2:e660e68a91fa 58 t.start(); //the time since the beginning of the main loop
jrsikken 2:e660e68a91fa 59 beat.rise(&flip); //the interrupt flip is started to the rising edge
jrsikken 2:e660e68a91fa 60 while (1) { //program loops around in here
jrsikken 2:e660e68a91fa 61 if (displayBPMFlag == 1) { //if the flag is set that the BPM can be used in the main loop
jrsikken 2:e660e68a91fa 62 displayBPMFlag = 0; //clear displayBPMflag
jrsikken 2:e660e68a91fa 63 if (CNT>250&CNT<2000) { //when heart rate is within 30-240BPM
jrsikken 0:939617e180e8 64 BPM = 60000/CNT; //calculate BPM
jrsikken 0:939617e180e8 65 lcd.locate(0,0); //set cursor to first character and first line
jrsikken 2:e660e68a91fa 66 lcd.printf("%i ms ",CNT); //display the time in ms on the lcd
jrsikken 0:939617e180e8 67 lcd.locate(0,1); //set cursor to first character and second line
jrsikken 2:e660e68a91fa 68 lcd.printf("%i BPM ",BPM); //display the beats per minute on the lcd
jrsikken 1:8b001f936bb0 69 printf("%i\r\n",CNT); //print time between heart beats to the serial port
jrsikken 2:e660e68a91fa 70 bt.printf("%i\r\n",CNT); //print time between heart beats to the bluetooth serial port
jrsikken 2:e660e68a91fa 71 FILE *fp=fopen("/msc/HR.txt","a+");//Open file on USB Mass Storage device, 8.3 filesystem, open for write and append
jrsikken 2:e660e68a91fa 72 if ( fp == NULL )error("Could not open file for write\n");//error code
jrsikken 2:e660e68a91fa 73 fprintf(fp, "%f,%i\r\n",t.read(),BPM);//write time-since-start-main-loop and BPM to file
jrsikken 2:e660e68a91fa 74 fclose(fp); //close file
jrsikken 2:e660e68a91fa 75 } else { //when heart rate is NOT within 30-240BPM
jrsikken 0:939617e180e8 76 lcd.cls(); //clear the lcd display
jrsikken 0:939617e180e8 77 lcd.locate(0,0); //set cursor to first character and first line
jrsikken 0:939617e180e8 78 lcd.printf("- ms"); //display empty time in ms on the lcd
jrsikken 0:939617e180e8 79 lcd.locate(0,1); //set cursor to first character and second line
jrsikken 0:939617e180e8 80 lcd.printf("- BPM"); //display empty beats per minute on the lcd
jrsikken 2:e660e68a91fa 81 printf("0 \r\n"); //print no time in ms to the serial port
jrsikken 2:e660e68a91fa 82 bt.printf("0 \r\n"); //print no between heart beats to the bluetooth serial port
jrsikken 2:e660e68a91fa 83 FILE *fp = fopen( "/msc/HR.txt", "a+");//Open file on USB Mass Storage device, 8.3 filesystem, open for write and append
jrsikken 2:e660e68a91fa 84 if ( fp == NULL )error("Could not open file for write\n"); // error code
jrsikken 2:e660e68a91fa 85 fprintf(fp, "0,0 \r\n"); //write "0,0" to file
jrsikken 2:e660e68a91fa 86 fclose(fp); //close file
jrsikken 0:939617e180e8 87 }
jrsikken 0:939617e180e8 88
jrsikken 0:939617e180e8 89 }
jrsikken 0:939617e180e8 90
jrsikken 0:939617e180e8 91 }
jrsikken 2:e660e68a91fa 92
jrsikken 1:8b001f936bb0 93 }