August 05, 2020, 09:32:05 pm

EKG

Started by jamesrdelaney, August 05, 2013, 02:23:42 am

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jamesrdelaney

Hi
I have the Shield EKG/EMG.
I am getting similar noise to this post:
https://www.olimex.com/forum/index.php?topic=556.0

I have these electrodes:
https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PA/open-source-hardware

I am using it with Arduino Uno R3.
These jumpers are set:
5V
Ref E
D9

I have the electrodes on my right and left inner forearm and leg.

I have been trying this for hours now using
Elecguru, Brainbay and FreeHC but I just get noise.


Please tell me:

a) should I be using actual sticky electrodes like in a hospital - like this http://www.asid-bonz.de/1/ward-supplies/ecg-electrodes/  ?

b) if I feed out the raw data from electrode 1 and put it into an osciliscope should I see a normal EKG type signal or does it need processing first?
I am trying to output the data raw so I can have a look in Excel etc to check I am getting sensible values.

Please help Ive spent hours on this!

Many thanks
James

jamesrdelaney

Hi

This is the second message I have posted on the forum with regard to this issue with no response.

Please support your product or provide an alternative form of support!!

James


Quote from: jamesrdelaney on August 05, 2013, 02:23:42 am
Hi
I have the Shield EKG/EMG.
I am getting similar noise to this post:
https://www.olimex.com/forum/index.php?topic=556.0

I have these electrodes:
https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PA/open-source-hardware

I am using it with Arduino Uno R3.
These jumpers are set:
5V
Ref E
D9

I have the electrodes on my right and left inner forearm and leg.

I have been trying this for hours now using
Elecguru, Brainbay and FreeHC but I just get noise.


Please tell me:

a) should I be using actual sticky electrodes like in a hospital - like this http://www.asid-bonz.de/1/ward-supplies/ecg-electrodes/  ?

b) if I feed out the raw data from electrode 1 and put it into an osciliscope should I see a normal EKG type signal or does it need processing first?
I am trying to output the data raw so I can have a look in Excel etc to check I am getting sensible values.

Please help Ive spent hours on this!

Many thanks
James

LubOlimex

Hello James,

Probably you are not using the proper code. Unfortunately, we don't own UNO R3 board to test over here, but there are few project available at YouTube that might provide useful for you. For instance: http://www.youtube.com/watch?feature=player_embedded&v=uuGDnuqZqu8&noredirect=1. Also the user berdran reported success of making those two working in this thread: https://www.olimex.com/forum/index.php?topic=1230.msg5852#msg5852.

a) should I be using actual sticky electrodes like in a hospital - like this http://www.asid-bonz.de/1/ward-supplies/ecg-electrodes/  ?

No. The official electrode is this one: https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PA/. You can find how http://i.imgur.com/WrCuwvY.png.

b) if I feed out the raw data from electrode 1 and put it into an osciliscope should I see a normal EKG type signal or does it need processing first?

It is a data packet that follows a specific protocol from the OpenEEG specification. The firmware revision is named p2; you can find it here: http://openeeg.sourceforge.net/doc/modeeg/firmware/modeeg-p2.c.

Best regards,
Lub/OLIMEX
Technical support and documentation manager at Olimex