Arduino ECG & Heartrate monitoring

Overview

This is an example of acquiring accurate ECG(electrocardiogram) & Heartrate from Arduino UNO.

Configuration

• Arduino : Arduino UNO(Source code)
• ECG Sensor : PSL-iECG2 with isolation
• PC software : PSL-Serial(freeware by PhysioLab) 

Human ECG => PSL-iECG2(ECG, Beat) => Arduino(CSV Data) => PC PSL-Serial Software

Goal

• Accurate A / D Conversion Sampling : Using TimerOne Interrupt
• Sampling rate : 500 SPS
• Output : ECG wave, Beat signal, Heartrate
• Safety : Isolation

[PSL-iECG2]

￭ High quility ECG Sensor

￭ Analog ECG 2-channel amplifier module(Ch.1 ECG, Ch.2 Beat)

￭ DC 5V power input

￭ Isolation power and signal

￭ Current consumption 50mA or less

￭ Amplification 750V/V

￭ Selectable 50Hz or 60Hz by the notch filter switch

￭ Optimized HPF and LPF design for ECG

￭ Output signal 0~3.3V(center 1.65V)

￭ Size 56mm X 35mm

￭ Lead cable with shield and stereo jack

Configuration of Arduino and PSL-iECG2

Arduino Source Code  using TimerOne interrupt

Arduino Source and PSL-Serial SW

#include <TimerOne.h> int analogPin0=0; int analogPin1=1;   void setup() { Serial.begin(1000000); Timer1.initialize(2000); // micro second Timer1.attachInterrupt(AnalogAD); Timer1.start(); }   void AnalogAD() { int reading0=analogRead(analogPin0); int reading1=analogRead(analogPin1);   float Voltage0=(float)reading0/1023*5; float Voltage1=(float)reading1/1023*5;   if (Voltage1>1.65) digitalWrite(13,HIGH); else digitalWrite(13,LOW);   String str=String(Voltage0,3) +","+ String(Voltage1,3); Serial.println(str); }   void loop() { }

[Download : PSL-Serial_Arduino_V1.0.zip ] ￭ Contact our email or PhysioLab website link. (PhysioLab website>Support>Driver&S/W board) http://www.physiolab.co.kr/Support_driver_view.aspx?ID=1106   [Arduino code] ￭ A/D conversion is performed with 2Ch. analog input and 500SPS sampling rate in Arduino. ￭ This is an example of A/D converted 2Ch. data in a CSV format and transmitted the data to a PC. ￭ Programmed to determine accurated A/D conversion cycle using TimerOne interrupt. (The TimerOne library is included in the download file above.) ￭ Turn on the LED if the Beat data is greater than 1.65V.   [PSL-Serial SW] ￭ PSL-Serial SW displays CSV data, graph, and heart rate transmitted from Aduno and PSL-iECG2. ￭ PSL-Serial titles can be modified your own project name. ￭ PSL-Serial don't need installation, just download them. PSL-Serial_Win10 (Win7) .exe, PSLSerial.dll ￭ PSL-Serial SW is a Freeware. ￭ We would be very grateful if you could introduce us to your project.

The user can modify the title and information.

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