#include "BluetoothSerial.h"

BluetoothSerial SerialBT;
const int ledPin = 32;

void setup () {
  SerialBT. begin("ESP32-Bluetooth");
  pinMode (ledPin, OUTPUT);
}

void loop() {
  if (SerialBT.available()) {
    char c = SerialBT.read();
    if (c == '1') {
      digitalWrite(ledPin, HIGH);
    } else if (c == '0') {
      digitalWrite(ledPin, LOW);
    }
  }
}