INO - Arm Robot

#include <SoftwareSerial.h>
#include <Servo.h>

Servo thumb;
Servo index;
Servo middle;
Servo ring;
Servo pinky;

SoftwareSerial bluetooth(3, 2); // RX, TX

void setup() {
  Serial.begin(9600);
  bluetooth.begin(9600);
  thumb.attach(4);
  index.attach(5);
  middle.attach(6);
  ring.attach(7);
  pinky.attach(8);
}

void loop() {
  if (bluetooth.available() > 0) {
    char received = bluetooth.read();
    if (received == '0') {
      thumb.write(0);
      pinky.write(0);
      ring.write(0);
      middle.write(0);
      index.write(0);
    } else if (received == '1') {
      index.write(90);
      pinky.write(0);
      ring.write(0);
      middle.write(0);
      thumb.write(0);
    } else if (received == '2') {
      index.write(90);
      middle.write(90);
      pinky.write(0);
      ring.write(0);
      thumb.write(0);
    } else if (received == '3') {
      index.write(90);
      middle.write(90);
      ring.write(90);
      pinky.write(0);
      thumb.write(0);
    } else if (received == '4') {
      index.write(90);
      middle.write(90);
      ring.write(90);
      pinky.write(90);
      thumb.write(0);
    } else if (received == '5') {
      index.write(90);
      middle.write(90);
      ring.write(90);
      pinky.write(90);
      thumb.write(90);
    }
  }
}