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Application Report
SLAA486A–March 2011
EKG-Based Heart-Rate Monitor Implementation on the
LaunchPad Using MSP430G2xx
Abhishek Joshi, Sourabh Ravindran, Austin Miller ............................................... MSP430 System Solutions
ABSTRACT
This application report describes a low-cost heart-rate monitor solution based on the MSP430™
LaunchPad Value Line Development Kit (MSP-EXP430G2), which uses the MSP430G2xx microcontroller
(MCU). A daughterboard amplifies and filters the electrocardiogram (EKG) signal before it is sent to the
MCU for sampling and processing. The heartbeat-per-minute data is sent to the PC by means of the back-
channel UART-over-USB available on the LaunchPad. Additionally, an eZ430 radio frequency (RF) target
can be connected to the six-pin header on the daughterboard to transmit data wirelessly via the
SimpliciTI™ network protocol. The system can be powered by either universal serial bus (USB) power, a
CR2032 3-V coin cell, or two AA or AAA batteries.
WARNING
The application presented here is for reference design purposes
only and is not intended for any life-saving or medical-monitoring
use.
Project collateral and source code discussed in this application report can be downloaded from the
following URL:
http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/EKG-Based-Heart-Rate-
Monitor/1_00_00_00/index_FDS.html.
Contents
1 Introduction .................................................................................................................. 2
2 Hardware Description ...................................................................................................... 3
3 Software ...................................................................................................................... 6
4 References ................................................................................................................... 7
Appendix A Amplifier Options ................................................................................................... 8
Appendix B Wired USB Demo With Back-Channel UART ................................................................ 10
Appendix C Wireless UART Demo With the eZ430 RF Target Board ................................................... 11
Appendix D Hardware Schematic Diagrams ................................................................................. 12
List of Figures
1 Human Heart Anatomy (left) and EKG Waveform (right).............................................................. 2
2 Hand Detection Circuit Diagram .......................................................................................... 3
3 Software Flowchart ........................................................................................................ 6
4 Heart-Rate Monitor Setup (left) and UART Output on PC (right)..................................................... 7
5 Hardware Schematic Diagram (Page 1/2) ............................................................................. 12
6 Hardware Schematic Diagram (Page 2/2) ............................................................................. 13
List of Tables
1 LaunchPad Port/Pin Functionality Mapping – Left Header............................................................ 4
1
SLAA486A–March 2011 EKG-Based Heart-Rate Monitor Implementation on the LaunchPad Using
MSP430G2xx
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