EMG Muscle Sensor

Features:

• EMG Muscle Sensor
• Detects when a muscle is contracted or relaxed
• The more muscle activity the greater the voltage
• Voltage varies from GND to Vss
• Just one pin Analog Output
• Attach electrodes to the skin above the muscle and plug the cable into this sensor
• Electromyogram (EMG)
• Filters & Rectifies the signal onboard
• Breadboard compatible
• Power voltage (Vss): 3.5 to 9V dual +/- power supply

Arduino Sample Code for controlling a servo motor by measuring muscle activity when opening and closing your hand:

#include <Servo.h>

//Threshold for servo motor control with muscle sensor.
//You can set a threshold according to the maximum and minimum values of the muscle sensor.
#define THRESHOLD 250

//Pin number where the sensor is connected. (Analog 1)
#define EMG_PIN 1

//Pin number where the servo motor is connected. (Digital PWM 3)
#define SERVO_PIN 3

//Define Servo motor
Servo SERVO_1;

/*-------------------------------- void setup ------------------------------------------------*/

void setup(){
 
  //BAUDRATE set to 115200, remember it to set monitor serial properly.
  //Used this Baud Rate and "NL&CR" option to visualize the values correctly.
  Serial.begin(115200);
 
  //Set servo motor to digital pin 3
  SERVO_1.attach(SERVO_PIN);
}

/*--------------------------------  void loop  ------------------------------------------------*/

void loop(){

  //The "Value" variable reads the value from the analog pin to which the sensor is connected.
  int value = analogRead(EMG_PIN);

  //If the sensor value is GREATER than the THRESHOLD, the servo motor will turn to 170 degrees.
  if(value > THRESHOLD){
    SERVO_1.write(170);
  }

  //If the sensor is LESS than the THRESHOLD, the servo motor will turn to 10 degrees.
  else{
    SERVO_1.write(10);
  }

  //You can use serial monitor to set THRESHOLD properly, comparing the values shown when you open and close your hand.
  Serial.println(value);
}