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 Post subject: ECG with hand grip bar
PostPosted: Fri Nov 10, 2017 9:01 am 

Joined: Fri Nov 10, 2017 6:48 am
Posts: 1
Hi,
I am using eHealth shield board v2.0 + arduino uno with ECG electrodes. I have put the jumper to ECG(left side) and I made the electrode to a hand grid bar format. I used two metal plates as a 2-lead electrodes. I am using eHealth_arduino_v2.4 library + arduino v1.6.12 IDE.
Here are the photos:
https://www.dropbox.com/s/ypy7e2jvr6cm9 ... n.jpg?dl=0
https://www.dropbox.com/s/b61q4ctut1opx ... p.jpg?dl=0

Here is my test code:

#include <eHealth.h>

void setup()
{
Serial.begin(115200);
}

void loop()
{
float ECG = analogRead(0);
float analog0 = (float)ECG * 5 / 1023.0;//convert to voltage value

Serial.println(analog0);
delay(1); // wait for a millisecond
}

I have tried below electrode combination:
+ : right hand, + : right hand , + : left hand, + : left hand
- : left hand, - : left hand, - : right hand, - : right hand
N : left hand , N : right hand, N : left hand, N : right hand

and the waveform from arduino serial plotter is below no matter both hands are grabbing the metal plates or not:
https://www.dropbox.com/s/vm191cc9ydc1f ... e.PNG?dl=0

Questions:
1. Can I change the 3-lead chest electrodes to a 2-lead hand grip bar format?
2. If yes, may I know how can I get the right value output?
3. If no, do u know which sensor is good for ECG 2-lead hand grip bar format?

Many thanks your help in advance.
Elisa.


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 Post subject: Re: ECG with hand grip bar
PostPosted: Mon Nov 13, 2017 8:21 am 

Joined: Mon Sep 28, 2009 12:06 pm
Posts: 11292
Hi elisalee,

elisalee wrote:
1. Can I change the 3-lead chest electrodes to a 2-lead hand grip bar format?
2. If yes, may I know how can I get the right value output?

The circuit of the board have been developed to work with 3-lead cable, not with 2-lead.

elisalee wrote:
3. If no, do u know which sensor is good for ECG 2-lead hand grip bar format?


All the sensors that e-health has, have been developed to work with our shield. We have not experiment with other kind of sensors. As i have mentioned, the circuit integrated on the board will not work with other sensors.

Your project is a good idea but we think that it won't work with the e-health circuits. You will need to develop a specific circuit for a 2-lead hand grip.

Regards


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