Myoelectric sensor-controlled hand prosthesis

#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 200

//Pin number where the sensor is connected. (Analog 0)
#define EMG_PIN 0

//Define Servo motor

const int servoPinA = 4;
Servo servoA;

const int servoPinB = 5;
Servo servoB;

const int servoPinC = 6;
Servo servoC;

const int servoPinD = 7;
Servo servoD;

/*-------------------------------- 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);

  servoA.attach(servoPinA);
  servoB.attach(servoPinB);
  servoC.attach(servoPinC);
  servoD.attach(servoPinD);// damos um "start" nos pulsos do servomotor, associando o pino de controle com a gerao de pulsos promovida pela funo e mtodo - "servo.attach()"


  openGripper();
  //servoA.write(90);        // Definimos o ngulo inicial do servo em 90 graus (posio central do servomotor)
  //servoB.write(90);
  //servoC.write(90);
  //servoD.write(90);
}

/*--------------------------------  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 (Serial.available())
  {
    if (value > THRESHOLD) {
      closeGripper();
    } else {
      openGripper();
    }
  }

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

void openGripper() {

  servoB.write(150);
  servoC.write(0);
  delay(500);
  servoA.write(150);
  servoD.write(0);

}

void closeGripper() {

  servoB.write(0);
  servoC.write(150);
  delay(500);
  servoA.write(0);
  servoD.write(150);
}