int sensorPin = A7; // select the input pin for the signal from the TL084
int muscle_value;

void setup()
   {
    // Start the hardware serial.
    Serial.begin(9600);
    
    pinMode(2, OUTPUT);
    pinMode(3, OUTPUT);
    pinMode(4, OUTPUT);
    pinMode(5, OUTPUT);
    pinMode(6, OUTPUT);    
   }


void loop()
   {
    muscle_value = analogRead(sensorPin);
  
     
    Serial.print("muscle = ");
    Serial.println(muscle_value);
        
    muscle_value = map(muscle_value,0,1024,0,100);
        
    if ((muscle_value >= 0) && (muscle_value < 10))
       {
        digitalWrite(2, HIGH);
        digitalWrite(3, LOW);
        digitalWrite(4, LOW);
        digitalWrite(5, LOW);
        digitalWrite(6, LOW);
       }

    if ((muscle_value >= 10) && (muscle_value < 20))
       {
        digitalWrite(2, LOW);
        digitalWrite(3, HIGH);
        digitalWrite(4, LOW);
        digitalWrite(5, LOW);
        digitalWrite(6, LOW);
       }

    if ((muscle_value >= 20) && (muscle_value < 30))
       {
        digitalWrite(2, LOW);
        digitalWrite(3, LOW);
        digitalWrite(4, HIGH);
        digitalWrite(5, LOW);
        digitalWrite(6, LOW);
       }

    if ((muscle_value >= 30) && (muscle_value < 40))
       {
        digitalWrite(2, LOW);
        digitalWrite(3, LOW);
        digitalWrite(4, LOW);
        digitalWrite(5, HIGH);
        digitalWrite(6, LOW);
       }

    if (muscle_value >= 40)
       {
        digitalWrite(2, LOW);
        digitalWrite(3, LOW);
        digitalWrite(4, LOW);
        digitalWrite(5, LOW);
        digitalWrite(6, HIGH);
       }
           
       
   }