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MCUv2 Bluetooth Audio-Transmitter recommendation

jlindema

Member
Feb 27, 2017
10
8
California
Howdy TMC community!
I recently paid the Fremont service center to upgrde my Model S (circa early 2017)
from its original MCU to MCUv2. Although I'm enjoying the MCU upgrade, something
they didn't even bother to mention...was the loss of AM/FM/XM tuner.

I thought...no problem. I'll get a small AM/FM radio and a bluetooth transmitter,
pair it with the (new and improved Bluetooth in my MCUv2), and all will be well.
By the way- I have zero problems pairing my cell phone and playing music through it.
But I do NOT have an unlimited data plan nor do I have AM/FM tuner on my cell phone directly.
I'd prefer not to use my cell phone as a substitute for the missing AM/FM over-the-air tuner.

I have no problems with the radio I bought (https://www.amazon.com/gp/product/B07YJBTSWY)
but the MCUv2 doesn't want to pair with any of the 3 BT transmitter's I've tried:
* https://www.amazon.com/gp/product/B07V9RKGK7
MCU doesn't "see" it when scanning. Works perfectly using a separate speaker (such as Amazon, BKS30)
* https://www.amazon.com/gp/product/B07W5S2WVN
never got this one to work at all
* https://www.amazon.com/gp/product/B0829S6K1X
shows up when MCU is scanning, but won't pair

I get that the MCU (software/firmware) is optimized for pairing with cell phones.
Has anyone in this forum had success pairing their audio device (not a cell phone) with their
MCU, and getting it to play?
If so- please provide a link to the actual device with which you had success.

If not- there are a lot of very smart technical people on this forum. Here's a perfect entrepreneurial
opportunity to create a device whose BT class-of-service _appears_ like a cell-phone (so it'll pair), and
allows the MCU to play the incoming audio (line-in?). I'd pay a fair price for that! Arduino/Raspberry Pi/etc.?
Any thoughts how I could do this myself? (I'm far from a Bluetooth expert, but do know my way around a
soldering iron, schematic, and a few programming languages)

Thanks!
 

fanofanne

Member
May 22, 2018
23
26
Minneapolis
I put in some info on the other longer thread - Tesla confirms infotainment system upgradeability from MCU1 to MCU2 for $2500

Basically in my research i found that the Sirius XM bluetooth apparently works, since it appears as a phone to the car, but that might get you XM, not sure about AM or FM. The other alternative that i tried was to go the RTL SDR route with my Pixel phone and that works. I do get narrowband FM (haven't done a real world test, taking it for long drives etc) this way. It does come with an android app, SDR Touch that you can save presets on. I figured for $30 not a bad hack.
 

obie_fl

Member
Jan 5, 2018
217
515
Florida
Most of the devices are FM transmitters used to connect phones to older cars that don't have built in BT. The VicTsing device you linked to is an FM transmitter not receiver.
 

jlindema

Member
Feb 27, 2017
10
8
California
I put in some info on the other longer thread - Tesla confirms infotainment system upgradeability from MCU1 to MCU2 for $2500

Basically in my research i found that the Sirius XM bluetooth apparently works, since it appears as a phone to the car, but that might get you XM, not sure about AM or FM. The other alternative that i tried was to go the RTL SDR route with my Pixel phone and that works. I do get narrowband FM (haven't done a real world test, taking it for long drives etc) this way. It does come with an android app, SDR Touch that you can save presets on. I figured for $30 not a bad hack.


Thanks fanofanne!
I too thought about SDR, but as you know- the sad thing is that bringing in the AM/FM signals isn't the problem.

The problem here is that MCUv2 won't pair with "generic" Bluetooth audio devices, instead *only* pairing
with a Bluetooth device presenting itself as a "phone".
Looking for a way to change/trick a Bluetooth module to advertise itself as a phone, I found this programmable
Bluetooth module: THINGY Programmable Bluetooth Module (video)
However that project is ancient (2014). The design company mentioned in that project (2333 Designs & Mfg)
may be able to help. Adafruit too: Bluetooth : Adafruit Industries, Unique & fun DIY electronics and kits

I'm still pursuing this idea- and will post again if/when I find something that does the job.
 

jlindema

Member
Feb 27, 2017
10
8
California
While fanofanne's project is more versatile, this combination of gear (below)
seems to work for us iPhone users.

The HeadsetBuddy isn't technically required, but it sure makes things easier. I tried chopping-off connectors
and soldering my own connections, however the gauge and type of wiring I was dealing with was too challenging (a.k.a. "disaster").
Save yourself the headache... connect the radio's line-out to the UGREEN converter with a HeadsetBuddy :)

Shout-out to Apple App developer Von Bruno (‎Von Bruno Apps on the App Store)
for making their app free. It's easy to use and does the job perfectly.

--------------------------------

Personal AM/FM Pocket Radio Portable VR-robot, Mini Digital Tuning Walkman Radio, with Rechargeable Battery, Earphone, Lock Screen for Walk/Jogging/Gym/Camping
$16.99
https://www.amazon.com/gp/product/B07YJBTSWY/

HeadsetBuddy
$21.95
https://www.amazon.com/gp/product/B00OAW85ZG/

UGREEN Headphones Adapter for Apple,Apple MFi Certified iPhone Lightning to 3.5mm Jack Converter Compatible for iPhone SE/11/11 Pro/11 Pro Max/X XR XS XS Max iPhone 7 7P 8 8P
$15.99
https://www.amazon.com/gp/product/B07Q49SVYR/

Microphone Live - iPhone App
‎Microphone Live
 

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