Stumbled upon btinterface

I was browsing the google play store one day when I came across something called BTInterface.

Anyways, that free btinterface program led me to btinterface.com where I watched a few of the videos posted. I was immediately impressed with the possibilities. So I bought an android phone, and installed the btinterface app.

I picked up a couple of arduinos (mega 1280) about $12 each, and bt modules, about $8 on ebay, and also picked up some relays to fool around with (about $12) and jumper cables...

BTInterface will allow you to connect to a bt module, then send commands to it. You need a sketch on the arduino to do something with those commands.

BTInterface being a bit limited in what it can do - I purchased basic4android.

So, with basic4android I put together a few screens, on a couple of tabs. The first tab, "Sources" - allows you to edit the name and select a source (these names are saved to an internal file). So they'll be there when you restart the app.

The second tab, "Attenuator" give you coarse and fine tune position (upto 128) on your attenuator and a mute button.

So, what's happening in the android app, is it's connecting to the bt module, and when the sources are selected- it's sending b1, b2, b3, b4 (for inputs 1 to 4) and on the attenuator side, it's sending the position of the attenuator from 1 to 128, 0 for mute.

The arduino sketch will basically, turn these relays on and off depending on the button selected. That's pretty much it in a nut shell.

I've got the source selector working, the hardware was cheap and easy to work with. Just need to wire these up in parallel and attach rca jacks to them.

I'm currently working on the attenuator hardware... stay tuned for part 2 of this blog.

I'll be posting my android / arduino code soon.

Here's some video from youtube...

https://www.youtube.com/watch?v=5cVDc5mJJZA

https://www.youtube.com/watch?v=DHKVyyZ9nX4

https://www.youtube.com/watch?v=QKkGZ-TB2GE