Advice on EMG sensor as Controllers

[qpurr]

Hello. I am making a project where Electromyograph(EMG) muscle sensor is used as a substitute for traditional joystick controllers such as PS3. Currently using MyoWare2.0 EMG sensor and connected to ESP32 as the microcontroller.

At first I was thinking of using fingers to differentiate the the joystick movements for example, folding thumb as right stick Y axis, folding middle finger as right stick X axis etc. However, it seems like it is hard to detect the finger muscle movement as they overlap each other and I only own 2 of these sensors.

For now, I have done the part where forearm muscle is flexed, and the EMG value is more than 1000, it will act as the left stick Y+ axis.
Note that in the code it is written to press 'W' because I am connecting it to BLE keyboard and it is input to control the Y+ of virtual joystick. I just found out about the BLEJoystick and will look onto it later but for now I am using the BLE keyboard.

#include <BleKeyboard.h>

BleKeyboard bleKeyboard;

#define EMG_PIN 27
int emgValue = 0; 
int Mmode =0;


//track movemnet
bool isMoving = false;

void setup() 
{
  Serial.begin(115200);
  Serial.println("Starting BLE work!");
  bleKeyboard.begin();
  
 
//SerialBT.connect();
pinMode(EMG_PIN, INPUT); // Initialize the EMG sensor pin as input
  
  Serial.println("program start");
  delay(500);

}


 void readEMG() {
  emgValue = analogRead(EMG_PIN);
  //unsigned long currentMillis = millis(); //current millis is read in milli second
  
  //add if the EMG value crosses the limit emg(4095) + debounce time=500ms
// if(emgValue >=4095 && (currentMillis - lastDebounceTime) > 500){ 
  //if(emgValue >=3000){
 // isMoving = !isMoving;
 // lastDebounceTime = currentMillis; //update debounce time
 /* Serial.print("EMG value: ");
  Serial.print(emgValue);
   Serial.print(" - State changed to: ");
   Serial.println(isMoving ? "Moving" : "Not Moving");
*/}

void loop() 
{
 readEMG();
  
  if(emgValue >= 4095){
  Mmode =4;//  bila 0 aka stop
    } 
    else if  (emgValue >= 3000 && emgValue <=4094 ){  // 1:(前進）
     Mmode = 3;
      bleKeyboard.press('W');
     
    }
    else if  (emgValue >= 2000 && emgValue <=2999 ){  // 1:(前進）
     Mmode = 2;
     bleKeyboard.release('W');
    }
    else if  (emgValue >= 1000 && emgValue <=2999 ){  // 1:(前進）
     Mmode = 1;
      bleKeyboard.release('W');
    }else if  (emgValue <=1000 ){  // 1:(前進）
     Mmode = 0;
    }   


 Serial.print("Mmode: ");
   Serial.println( Mmode);
   Serial.println(emgValue);

   delay(100);
   
  // interval += intervalPeriod;

    }

Current hardware setup is something like this:

My main concern is what other sensor or what else can I add to the system to complete the controller(right and left stick only)? I am open to any suggestions and if there are other projects which I can look into to get inspired from, please feel free to comment your ideas.