User Manual

RAW EMG vs EMG Envelope
Our Muscle Sensors are designed to be used directly with a microcontroller. Therefore, our
sensors primary output is not a RAW EMG signal but rather an amplified, rectified, and
integrated signal (AKA the EMG’s envelope) that will work well with a microcontroller’s
analog-to-digital converter (ADC). This difference is illustrated below using a
representative EMG signal. Note: Actual sensor output not shown.
RAW EMG Signal
Rectified EMG Signal
Rectified & Integrated
EMG Signal
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Reconfigure for Raw EMG Output
This new version has the ability to output an amplified raw EMG signal.
To output the raw EMG signal, simply connect the raw EMG signal pin to your measuring
device instead of the SIG pin.
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Note: The RAW output is centered about an
offset voltage of +Vs/2, see above. It is
important to ensure +Vs is the max voltage
of the MCU’s analog to digital converter. This
will assure that you completely see both
positive and negative portions of the
waveform.
Note: The amplification for the RAW output is not adjustable via the GAIN potentiometer.