ECG

Elektor articles

• ECG with an instrumentation amplifier board and Java using PC sound card <ref>ECG using a Sound Card, ELEKTOR Oct. 2006</ref>, at October 2006 issue

• Java executable and source, both available to download

• ECG using XBEE modules. XBEE gateway is connected to PC via serial port. Visualisation with Labview. <ref>Wireless ECG Monitoring cardiac signals with ZigBee, ELEKTOR Jan 2011</ref>

• Labview .vi file available to download

• ECG with well designed analog stage, PIC24, and Android application <ref>Android ElektorCardioscope, ELEKTOR 070/08 2013 </ref>

MSP430

TI ap-note SLAA280A

• SLA280A <ref>Heart-Rate and EKG Monitor Using the MSP430FG439 (Rev. A), Sept 2007</ref>

This application report describes how to build a digital heart-rate monitor using a MSP430FG439 microcontroller (MCU). The heartbeat rate per minute is displayed on an LCD. In addition, the application outputs a digital data stream via an RS232 serial port to allow EKG waveform display on a PC. PCB Gerber files, schematic, bill of materials, and firmware are provided in a zip file associated with this application report. The entire application runs using a CR2032 3-V lithium battery.

• A 17-tap low-pass FIR filter with pass-band upper frequency of 6 Hz and stop-band lower frequency of 30 Hz
• In order to calculate the heartbeat accurately, the QRS complex must be detected for every beat.

• The QRS complex is the fast-rising portion of the EKG waveform.
• If the low-pass filtered samples of the EKG are differentiated or high-pass filtered, the QRS complex can be isolated for every beat.
• A 17-tap high-pass FIR filter with a corner frequency of 2 Hz is used..
• The filtered output is further processed by subtracting a fixed threshold from the filtered output.

• This cuts off the unwanted disturbances caused by the P and T waves and other movement-related artifacts.

• Using this method, the QRS complexes are discriminated from the complete EKG waveform

Olimex board

• Olimex board with LCD and MSP430FG439 <ref> Heart-Rate and EKG Monitor Using the MSP430FG439 development board OLIMEX Price 25.95 EUR</ref> based on TI SLAA280A app-note.
• Available at Mouser <ref> Mouser Part No:909-MOD-EKG ,MOUSER, price €28.98</ref> and at Digikey <ref>OLIMEX MSP430FG439 MODULE, DIGIKEY, PRICE $35.62</ref>

Papers

• Periodic Noise Suppression from ECG Signal using Novel Adaptive Filtering Techniques
• Wireless ECG/EEG with the MSP430 Microcontroller
• MSP430 IMPLEMENTATION OF WAVELET TRANSFORM FOR PURPOSES OF PHYSIOLOGICAL SIGNALS PROCESSING
• Wavelet-Based ECG Delineation on a Wearable Embedded Sensor Platform
• Noise reduction for periodic signals using high-resolution frequency analysis
• Adaptive Noise Removal from Biomedical Signals Using Warped Polynomials

External links

• OLIMEX EKG products

References

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