by bangster - November 15th, 2020, 11:04 pm
Probably a decent way to do it, easy, and cheap, and okay sound. I did a cassette adapter (bad), a cheap wired FM modulator (a pain), and a bluetooth one, the quality just wasn't there for me, so I partially hacked it to work (still had the have a CD in the trunk mounted changer), I got the code to mimic a CD playing but couldn't get it to read the proper bytes and return the proper signal.
I am going to poke around the Mazdas in the yard when I go for some Escape and Fusion parts, and try to find wiring pins that fit the output of the radio. If I could find the cheapest way to power a 5v bluetooth module, I think $8 is doable. Even taking way over engineered USB power adapter, a Kickstarter Arduino board, a full on bluetooth usb module, still under $10 bucks.
I think I know someone with a Mazda RX8 that has the same radio, so might just put together an hour or so and bust it out.
"DIY" hardware, just add a little wiring:

Component level, mock it up then put it on a real board, but this bluetooth module with the edge connector is difficult to wire up, it is supposed to be soldered to a daughter board with solder balls I think:

Pre made simple components, just need to power the USB adapter and cut the audio cord:

I actually hope it doesn't work and the code needs tweaked, always boring to use someone else's code and it just works.