Geeetech Voice Recognition Module Robot

Hello!

So I am currently working on a project that uses the Geeetech voice module, it can have up to 15 commands but you can't actually use 15 commands, it's 3 groups and each group is 5 commands, you can only use 5 commands one at a time (at least that's how I understood it), so I have to use the last command of group 1 to 'enter' group 2 or 3.

Basically, my project makes a robot move forward, backward, turns left, and right. That's 4 commands. I also want to make it do some tricks like spin, and turn on and off an LED as its eyes. That's 3 commands. So in total it's 7 commands + 1 for entering group 2.

This is my code so far. Am I doing this right?

#include <Servo.h>

byte com = 0;

//Servo names
Servo myServoR;
Servo myServoL;

//LED pins
int RightLED = 2;
int LeftLED = 3;

void setup() {
  
Serial.begin(9600);

myServoR.attach(8); //servo pin right
myServoL.attach(9); //servo pin left

myServoR.write(0); //servo position at 0
myServoL.write(0);

pinMode(RightLED, OUTPUT);
pinMode(LeftLED, OUTPUT);

Serial.write(0xAA);
Serial.write(0x37);
delay(1000);
Serial.write(0xAA);
Serial.write(0x21);
Serial.write(0x22);
}

void loop() {

  while(Serial.available()) {

  com = Serial.read();

  switch(com) {

      case 0x11:   //command 1 "go straight"
      
      (code for going straight)

      break;

      case 0x12:  //command 2 "go back"

      (code for going back)
      

      break;

      case 0x13:  //command 3 "turn right"

      (code for turning right)

      break;

      case 0x14:  //command 4 "turn left"
      
      (code for turning left)

      break;

      case 0x15:  //command 5 enter group 2 "voibot"
      
      Serial.write(0xAA);
      Serial.write(0x22);// enter group 2

      break;

      case 0x16:  //command 6 "lights on"
      
      (code for turning on LED)

      break;

      case 0x17: //command 7 "lights off"

      (code for turning off LED)

      break;

      case 0x18: //command 8 "spin"

      (code for spinning)

      break;

            }
      }
}

I need help with figuring out how to enter group 2. Don't really understand what this part do, maybe if I knew, It would give me a hint. Any help would be appreciate it! Thanks

Serial.write(0xAA);
Serial.write(0x37);
delay(1000);
Serial.write(0xAA);
Serial.write(0x21);
Serial.write(0x22);

Am I doing this right?

If it works, yes. If not, no.

Don't really understand what this part do

It sends 2 bytes, waits, and then sends 3 more bytes, to something. We have no idea what you have connected to the serial pins, so we have no way of telling you what those bytes make that device do.