I tryed with arduino nano. If the arduino output set HIGH the relay modul turn on. Relay module: 3.93V on In port, 5V on VCC port, 0V on ground port. If Arduino output set to LOW the relay module turn on. If I add 5V to the relay module In port it do nothing. If I add 3.9V to the relay module In port turn on. If I add 3.3V to the relay module In port do nothing. If I add 0V to the relay module In port turn on. So it can not be used with arduino nano.
I tryed with arduino nano. If the arduino output set HIGH the relay modul turn on. Relay module: 3.93V on In port, 5V on VCC port, 0V on ground port. If Arduino output set to LOW the relay module turn on. If I add 5V to the relay module In port it do nothing. If I add 3.9V to the relay module In port turn on. If I add 3.3V to the relay module In port do nothing. If I add 0V to the relay module In port turn on. So it can not be used with arduino nano.