Basically, I’m sick and tired of the snarly clutter of a wired headset on my desk (connects to an old-school cordless phone). I can’t find a gizmo for sale, so I’m going to figure out how to make one. This seems like a great introduction to Arduino, but I could use a little direction.

Can you help me start narrowing down which board to use?

It will have one purpose: connecting a mono BT headset to the analog jack. It’s a ten-year-old headset, so I don’t think I need much in the way of processing power, speed, etc. Even if I need a different headset, it’d be just voice calls w/o wind, noise cancelling, voice command, etc. I can even do functions like mute and redial on the phone itself. I just want to ditch the wire.

I’d like it if it were pocket-sized, but it doesn’t need to be tiny.

I think this points to the Uno or Nano, but not sure where to go from there or even if I’m heading in the right direction. And once I’ve narrowed down the board, then what? Am I correct that I need a breadboard too? And then shields (modules?) for BT and the analogue wire connectivity? Is adding a rechargeable battery easy enough or should I stick with a 9v?

Other than a case (I can 3D model/print that), is there anything major I’m overlooking hardware-wise?