#include "BluetoothSerial.h" BluetoothSerial SerialBT; const int ledPin= 2 ; void setup () { // put your setup code here, to run once: SerialBT . begin ( "ESP32-Bluetooth20250402Β" ) ; pinMode ( ledPin,OUTPUT ) ; } void loop () { // put your main code here, to run repeatedly: if ( SerialBT . available ()) { char c= SerialBT . read () ; if ( c=='1' ){ digitalWrite ( ledPin, 1 ) ; } else if ( c=='0' ) { digitalWrite ( ledPin, 0 ) ; } } }