An envelope detector is a sophisticated algorithm that takes a (relatively) high-frequency amplitude modulated signal as input and provides an output, which is the demodulated envelope of the original signal. To use the EMG signal sampled by the ADC in a useful manner we need to detect an envelope of the signal recorded. A standalone Arduino code EMGEnvelop.ino has been added to the EXG repository which can be used for things like an LED bar graph of EMG potential and Servo control.