Wet Electrode sEMG Sensor Module

Wet Electrode sEMG Sensor Module

The Wet Electrode sEMG Sensor Module is a high-sensitivity surface electromyography device designed for gel-assisted wet adhesive electrodes, providing robust acquisition and amplification of microvolt-level muscle signals for research, prototyping, and wearable projects. The module delivers a conditioned analog waveform referenced to a 1.65V mid-rail (0–3.3V range) and a digital detect output for wear status, operates from a 5V supply with low current draw, and uses an XH2.54-4P connector for direct integration with Arduino and similar microcontroller platforms.

Features

• High total amplification (~13000×) for reliable detection of µV-level sEMG signals.
• Wet adhesive electrode support for improved skin contact and signal stability.
• Differential input stage and analog filtering to suppress common-mode and mains interference.
• Analog output (0–3.3V) suitable for direct ADC sampling by microcontrollers.
• Digital detect output for wear/connection status and signal presence detection.
• Low operating current (<10mA) optimized for battery-powered and wearable systems.
• XH2.54-4P module interface and example Arduino library for rapid prototyping.

• Keep the electrode pads aligned with the muscle.
• When the skin is dry, it is recommended to wipe the electrodes and skin with conductive gel or wipes.
• The supply voltage is 5V, the supply current is not less than 20mA, and the ripple and other noise should be small.
• This product is not a professional medical device and cannot be used as an auxiliary accessory for diagnosis and treatment.

PINOUT

Specifications

/* 
Serial port output:
        Baud rate 115200
        Sampling rate：500Hz 

Serial port output content(ASCII code)：
        Raw data, filtered EMG signal, envelope signal, wear detection signal
*/
#include "CheezsEMG.h"

#define SAMPLE_RATE 500        // Sampling rate
#define BAUD_RATE 115200       // Serial port baud rate
#define INPUT_PIN A0           // Signal input (white)
#define DETECT_PIN 2           // Detect input (yellow)
 
// Using the default configuration  
CheezsEMG sEMG(INPUT_PIN, DETECT_PIN, SAMPLE_RATE);  

void setup() 
{
  Serial.begin(BAUD_RATE);
  sEMG.begin();  
}  

void loop() 
{   
  if(sEMG.checkSampleInterval())
  {
    sEMG.processSignal();  

    Serial.println(
        String(sEMG.getRawSignal()) + "," +      // Raw data
        String(sEMG.getFilteredSignal()) + "," + // Filtering data
        String(sEMG.getEnvelopeSignal()) + "," + // Envelope data
        String(sEMG.getDetectSignal())           // Wearing situation
    );
  }
}