Prototype is working on bench, connect over bluetooth, answer phone, mic, speaker and dial with rotary. I'm using an STM32F103 development board to send commands to the Bluetooth module over UART, the STM32 is also encoding the pulse from the rotary dialer and watching the dialer and board switch on the phone.
The big raster board is only for the mic filter. It only consist of some R and C:s, I only had some SMD components at home and a big dev board but it works fine. Could use the old mic and speaker rom the phone.
Yesterday i finnished the PCB layout in eagle and sent the board file to
https://oshpark.com/ so I'm expecting the board to arrive in a couple of weeks, so i can continue my work.
I downgraded the CPU from an high density to a low density device from ST so I'm excpeting some change in the software when I hook this board up compare to my dev board.