the bluetooth modules I received are zs-h040 HC-05. the modules HC-05 and HC-06 use the same board but have substantial differences. HC-06 does not have a switch button which in HC-05 is for module configuration. HC-06 has only 4 PIns unlike HC-05 which has 6 PIns. HC-06 can only work as a slave and therefore can only accept connections. HC-05 can also initialize the connection with other device. Note: since the bluetooth communicates in serial, when you go to load the sketch from the computer to Arduino, it is necessary that the PIn RX0 and TX1 are free to avoid conflicts. if the PIns are occupied by the bluetooth module there will be an error that will not allow the correct conclusion of the operation

i moduli bluetooth che ho ricevuto sono zs-h040 HC-05. i moduli HC-05 e HC-06 usano la stessa board ma hanno delle differenze sostanziali. HC-06 non ha un pulsante di switch che in HC-05 serve alla configurazione del modulo. HC-06 ha solo 4 PIn a differenza di HC-05 che ne ha 6.. HC-06 può funzionare solo come slave e quindi può accettare solo connessioni. HC-05 invece può anche inizializzare la connessione con altro device. Nota bene: visto che il bluetooth comunica in seriale, quando si va a caricare lo sketch dal computer ad Arduino, è necessario che i PIn RX0 e TX1 siano liberi per evitare conflitti. se i PIn sono occupati dal modulo bluetooth vi sarà un errore che non permetterà la corretta conclusione dell'operazione

the bluetooth modules I received are zs-h040 HC-05. the modules HC-05 and HC-06 use the same board but have substantial differences. HC-06 does not have a switch button which in HC-05 is for module configuration. HC-06 has only 4 PIns unlike HC-05 which has 6 PIns. HC-06 can only work as a slave and therefore can only accept connections. HC-05 can also initialize the connection with other device. Note: since the bluetooth communicates in serial, when you go to load the sketch from the computer to Arduino, it is necessary that the PIn RX0 and TX1 are free to avoid conflicts. if the PIns are occupied by the bluetooth module there will be an error that will not allow the correct conclusion of the operation

Works very well

fonctionne très bien

Works very well