Tuesday, 1 December 2015

Experimenting with EMG


In the upcoming issue of ACM interactions magazine I will talk in my column on interaction technology about the electrical interfaces to humans. This blogpost is written to give you a preview of the article and describes a little project I did over the weekend to explore Electromyography (EMG).

It is the simplest circuit I could find and it results in a very simple and easy to make EMG. It takes less than half an hour to build and plugs into the microphone input of a computer. It uses a single operation amplifier (INA128p) and is based on the description in [1]. Builing the filter into the gain branch is quite nice ;-)




For my Experiment I used the following components:
  • a INA128p (Precision, Low Power Instrumentation Amplifiers)
  • 2 Capacitors (100uF, Elco) 
  • a Resistor of 120 Ohm 
  • 3 copper pieces (e.g. 5 cent coins) as electrodes for the body 
  • a 3.5mm audio connector (from broken headphones) 
  • some cables and prototyping board 
The eagle CAD file is available for download
Connecting it to other parts of the body made a very simple ECG – more suitable to get the heard rate that the shape of the signal.



More sophisticated circuits are available, e.g. openBCI [2] or an EMG shield for Arduino [3]. If you look more for commercial device you will find in [4] a good overview and also an introduction to emotion sensing.
 

[1] Bhaskar, A, Tharion, E., and Devasahayam, S.R. Computer-based inexpensive surface electromyography recording for a student laboratory. Advances in Physiology Education 31, 2 (2007), 242–243.
[2] http://www.openbci.com/
[3] https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/ 
[4] Kanjo, Eiman, and Alan Chamberlain. "Emotions in context: examining pervasive affective sensing systems, applications, and analyses." Personal and Ubiquitous Computing: 1-16

12 comments:

Florian Echtler said...

Nice article, thanks! :-) However, I'd like to suggest to never wire your body directly to anything that's plugged into mains power, use a laptop on battery instead. Case in point: https://electronics.stackexchange.com/questions/116895/how-can-a-faulty-usb-charger-kill-you

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Nice post.

Sadrul Shaila said...

hi am sadrul amin .am love playing cricket.of course EMA is very essential for us.its really good news for us.do you know about olympuschiro .thanks for this important news.

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