How to hook up "Ambu White Sensors" ECG Electrodes to Arduino Uno

Hello dear forum,

I got some of these "Ambu White Sensors" ECG Electrodes http://goo.gl/gj84U0 and I'm wondering if somebody can tell me how to hook them up to read incoming signals from them.

Here is the link to the datasheet http://www.ambu.com/Files/Billeder/MediaDB/Originals/IE%20WS%20493102601%20V06%200413.pdf

Please be patient if I ask noobish questions.

Thanks in advance.

Fabian

EDIT: The Ambu.com link does not work. I shortened it

The ECG machine usually has little clips that clip on to the exposed metal knob. Here is a bag of 10 for $20:

http://www.amazon.com/Electrodes-Adapter-clip-Universal-Connection/dp/B004HJJ3RQ

Hi John,

thanks for the reply.

So it is not possible to just solder a wire to it? I tried twirling one around it for starters. The reading I get when I hook it up (e.g. like a photoresistor https://raw2.github.com/fabiantheblind/analogio/master/light_dependend_resistor/fritzing-layout.png ) stays around a value of 270 and only gives small changes when I move. I tried different resistors but there is no noteworthy change.

I will ask my "supplier" for some of these adapters.

Any other suggestions?

Is it right to hook it up like a photoresistor or am I totaly wrong?

Cheers and thanks

Fabian

fabian-moron-zirfas: Is it right to hook it up like a photoresistor or am I totaly wrong?

That would be the way to hook it up if you want to measure skin resistance. The fact that the value didn't change much when you moved meant your connections were solid. That's a good thing.

Cool. Thats a relief.

So how could I "boost" the measurement?

  • By changing the resistor?
  • by using the AREF pin and 3,3V?

and another question:

you said "if you want to measure skin resistance" can I measure something else with a sensor like this?

Sorry for all those questions without trying it out myself. I don't have the sensors here right now. They are still in the lab at work but it would be nice to know what to try next week.

fabian-moron-zirfas: you said "if you want to measure skin resistance" can I measure something else with a sensor like this?

Those are not 'sensors'. They are 'electrodes' for making electrical connections to the skin. Different parts of the body produce electrical signals (brain, heart, muscles) but those signals are down in the microvolt (millionth of a volt) range and can't be measured directly by an Arduino. Without additional (and expensive) hardware you can't do much more than measure skin resistance.

Thanks.