Eletrode Jack

[rbyfield]

I have a problem I hope someone can help me out with. I have the olimexino-328 with one shield attached. I have the electrode cable and I have to connected to 3 electrodes on my arm. I am trying to write code in Arduino that will allow the voltage to be printed in the serial monitor. My problem is I do not know what the input is for the electrode jack. What do I define the electrode jack as in my code?

[LubOlimex]

Are you using SHIELD-EKG-EMG? There are a lot of customer-made examples of OLIMEXINO-328 and SHIELD-EKG-EMG, there is also the official one here: https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/resources/ShieldEkgEmgDemo.zip