Question about Designing EMG data acquisition

[Tom.G]

The attached image is the schematic for EMG circuit that worked, and I have question about DC level shifter circuit should I add it ??
so that (e.g. the output will be from 0 to 5V max), because Analog to Digital Converter "ADC" of the arduino can only accept this range.

For your particular use of detecting different muscle activity you would not need a level shifter.

However the converter on the Arduino board may not like a negative-going signal. I would say try connecting to the Arduino to see if you get reasonable results, if the results are bad then add a level shifter. (Unless of course you want to add a level shifter as part of learning more -- often a good idea. )

Cheers,
Tom

 

[Mo_Tuk]

Hello

I added the dc lavel shifter and the circuit works fine with arduino using ADC of the arduino, but now I have to do two things:

1) comparing the result with other built-in EMG shield by using correlation technique "Auto-Correlation"
2) add some realistic application to prove that the system is practical, any idea ??