The main reason causes a decrease in the accuracy of measurements of low-frequency signal parameters (including EMG / ECG / EEG signals) in laboratory, industrial and field conditions is the 50/60 Hz network interference.
Elemyo sensors provide the highest possible common mode rejection ratio, which allows the sensors to be used in very strong 50/60 Hz environments. Unfortunately, in some conditions, interference still appears in the signal. Examples of these conditions: touching the body of electrical equipment, power wires, working in a room with a very strong network load, individual skin parameters that affect the sensor contact. To suppress noise in such cases, it is proposed to use a 50/60 Hz notch filter. Below is a mathematical description of the filter, as well as an example of its implementation in the Arduino IDE.
You can find Elemyo library for Arduino here