While working from home and being kind of bored, I’ve been thinking about trying to build an interface board for my ham radio to be able to take the audio signals (mono microphone / mono audio out) to / from the radio and also expose a USB to serial com port that has an RTS or CTS signal that I could use with combination of WSJT-X, or the Soundmodem TNC to trigger the PTT (push to talk) pin. The radio in question is Yaesu FT-3dr that has a TRRS (tip ring ring sleeve) audio interface. The pins are Speaker, Mic, PTT and ground. I’d rather not have to use VOX (voice control) and would instead prefer that I use the RTS or CTS from a serial port to trigger this PTT pin. I believe it essentially grounds the PTT portion to enable push to talk.
In my searching for something that might be suitable I came across https://www.silabs.com/products/development-tools/interface/cp2615ek-2-evaluation-kit
Would this chip work as a) USB audio interface for the computer that I could connect mono speaker and mic and eventually wire an RTS pin to ground the PTT connection on the 4 connection audio cable?
Is there a better chip that would do what I’m looking to do? I realize I could order a Mobilinkd 3 TNC and also get Bluetooth. I also realize that this could be biting off way more than I can chew, but I’m not leaving the house much these days so I figured, why not play around with it?