#include <BluetoothSerial.h>
BluetoothSerial SerialBT; 
char dato=0;
const int rele1=4;
const int rele2=16;
const int rele3=17;
void setup(){ 
SerialBT.begin("ESP32");
Serial.begin(115200);
pinMode(rele1, OUTPUT);
pinMode(rele2, OUTPUT);
pinMode(rele3, OUTPUT);
digitalWrite(rele1, LOW);
digitalWrite(rele2, LOW);
digitalWrite(rele3, LOW);
}
void loop(){
if (SerialBT.available()) {
char dato = SerialBT.read();

if (dato == 'a') {
digitalWrite(rele1, HIGH); 
SerialBT.println("Foco1 Encendido");}
if (dato == 'b') { 
digitalWrite(rele2, HIGH); 
SerialBT.println("Foco2 Encendido");
}
if (dato == 'c') { 
digitalWrite(rele3, HIGH); 
SerialBT.println("Foco3 Encendido");
}
if (dato == 'd') { 
digitalWrite(rele1, LOW); 
digitalWrite(rele2, LOW); 
digitalWrite(rele3, LOW); 
SerialBT.println("Focos Apagados");
}}}