Arduino Uno Rev 3 and Olimex EKG/EMG Shield Setup Guide

[Dominikd98]

Hi Everyone!

As a university thesis I want to build an EMG controlled upper limb prosthetic arm, but I have some problems with the arduino uno rev 3 and an olimex ekg/emg shield, because somehow I can not get the right values. I already tried so many codes, but the results were the same. Because first of all I wanted to do a test measurement to see everything works properly and I can set the minimum values from the EMG signals at which my 5 servo motors will move. The end of the tests I always get the same result, 2.5 V.

I use these items:
- Arduino Uno rev 3 https://drive.google.com/file/d/1igtpqL8iifvylbT08B1HdXtLr2dSbw0V/view?usp=sharing
- Olimex EKG/EMG Shield https://drive.google.com/file/d/1daMP8lquNAiHCVUAHdikESgvJ_ZbQH4A/view?usp=sharing
- Electrodes https://bio-medical.com/covidien-kendall-disposable-surface-emg-ecg-ekg-electrodes-1-24mm-50pkg.html
- Cable https://elsalvador.desertcart.com/products/7158155-shield-ekg-emg-pro-cable-for-gel-ecg-electrodes

I placed the electrodes like this
https://drive.google.com/file/d/1-Dbg-bDbs09qbzTxFB89C3RMlBBKnV8h/view?usp=sharing
https://drive.google.com/file/d/1fdOw-2nNR1OKnTCISoEMUHQtOag4YpVl/view?usp=sharing

Also, there is a link here where I uploaded some pictures about my setup, the result and a file about my code for this project, I hope these are enough.   
https://drive.google.com/drive/folders/1t1ZwdjBwVBW6SCADLeNCyCVnOtOOXUPF?usp=sharing

Please could someone help me in this situation, because I don't really know how can I solve this problem!
It would be the best if someone share with me a very detailed document or a video about how can I set properly this equipments, of course If it is not a big ask!

Thanks forward everything! 

Dominik 

[LubOlimex]

We don't have much experience with EMG ourselves, but my advice is to first try EKG measurement as shown here:

https://www.olimex.com/Products/Duino/AVR/OLIMEXINO-2560/resources/Olimex2560-EKG.pdf

Such test would show if the hardware setup is alright (that is if you receive good EKG results as shown in the pictures).

You might also try these libraries:

https://github.com/WorldFamousElectronics/PulseSensorPlayground

https://github.com/Yleisnero/olimex-arduino-ecg-and-heart-rate-variability

[Dominikd98]

Dear LubOlimex!

Thanks for your answer, but somehow I didn't get anz notification about it and since then I found the solution.

But i got an other problem.

My new problem is I switched the electrodes to this https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PA/open-source-hardware ,I did this because I got an other advice how can I get better signals, but I don't know how to place it for an EMG measuring.

Can you help me again?

Thank you forward!