HC 05 Bluetooth Module Connection Issues

Hi,

I am trying to connect a HC-05 Bluetooth Module to my Arduino to connect to over devices. I have followed the setup according to this tutorial (http://www.instructables.com/id/Arduino-AND-Bluetooth-HC-05-Connecting-easily/) and looks like this:

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.

If you really have connected once, it should connect again, and the only two guesses that can be made are

  1. sloppy connections
  2. inadequate power

If you went away and came back, it might be just a matter of procedure that you didn't follow.
You might find the following background notes useful.

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino

Note that, while it is not necessarily a cause of your problem, it is good practice to use a 1k/2k voltage divider in Arduino Tx line.

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.

Good luck.

|
v

You can also see this tutorial might be helpfull:

|
v

http://www.martyncurrey.com/arduino-with-hc-05-bluetooth-module-in-slave-mode/

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.

Apple uses BLE which HC-05 is not.

If you want BLE you'll need the HC-10.

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.