I want to connect an Arduino to an android phone using an HC 05 BT module. I want to be able to send info from the phone and also read the info which is sent by the arduino. Can a HC 05 module be used for a duplex link?
No, but that is merely because of your loose use of the term, and you can do what you want to do.
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
I want to be able to control motors using an android app and if there is a status change in the system (eg. another sensor value changes) I want an update in the same android app. This is what I meant by duplex (maybe I did use the term incorrectly?).. But, is this achievable.
And thank you for sharing those links, I shall have a look!
abhir24:
maybe I did use the term incorrectly?
Yes, you did, but you can achieve what you want. There may be an existing Android app that suits your needs, you may have to write one yourself, or you may find a simple bluetooth terminal app will suffice.
Thank you, Nick!
I found an app which does that!