int inputSignal = 0;

void setup() {
  pinMode(2, OUTPUT);        // LED pin
  digitalWrite(2, LOW);      // Start OFF
  Serial.begin(115200);      // Important baud rate
}

void loop() {

  if (Serial.available() > 0) {

    inputSignal = Serial.read();   // Read input

    if (inputSignal == '1') {
      digitalWrite(2, HIGH);
      Serial.println("Muscle Detected → Appliance ON");
    } 
    else if (inputSignal == '0') {
      digitalWrite(2, LOW);
      Serial.println("Relax → Appliance OFF");
    }
  }
}