When I do this, the red light blinks continuously and when I try to connect the bluetooth device to my laptop (MacBook Pro 2014), it says that it is not connected. So far it has only connected once (with the same setup) but lost connection shortly after.
I´m not completely sure but I think HC-05 can´t establish connection to IOS and Apple producs. But I think HM-10 can.
I hope I´m sure and I hope this helps.
You shoul try to connect to another device, smartphone. If you have an iphone try it, this way you can find more things for your knowlege it´s cool and use the resistor dividor because in my case without him I can't send things to the arduino, i just can receive them on the phone.
danielleamya:
When I do this, the red light blinks continuously and when I try to connect the bluetooth device to my laptop (MacBook Pro 2014), it says that it is not connected. So far it has only connected once (with the same setup) but lost connection shortly after.
I don't think that is right.
IOS uses BLE and is incompatible with HC-05, but I didn't comment in reply#1 because OP clearly mentions a macbook, which is OSX, or the like, and is OK. If OP is correct in that there has been a connection, I guess that more or less confirms that this is not a problem, although I guess it might depend on what is actually meant by "connection". I understand iStuff can see HC-05, and thus may even pair with it, but they can't talk to each other.
The layout in reply#2 illustrates the divider I was referring to. The rest of the post is incoherent nonsense. The reason for the divider is just to reduce the five volts signal from Arduino to the 3.3v for bluetooth. It has nothing to with the ability to "send things to Arduino". If anything it is quite the opposite.
And forget about using an iPhone with HC-05.