Designing a Custom Bluetooth Upgrade

[Matthew Jeschke]

I'm slowly designing some electronics for the older trucks, NBS and before where there was no Bluetooth from the factory. The goal is to refresh my Embedded Design skills. I got a masters degree in Computer Engineering years ago and worked in the industry for 7 years but left for sales. That was nearly 12 years ago.

I want to get fresh with it all again. The first project I picked up is to design a upgrade to the existing Delco Radio in our trucks w/ bluetooth functionality. Goal is to:

- Seamless integration with Delphi head unit and harness.
- Utilize tape deck / auxiliary input controls on head unit to control playback from Bluetooth source.
- Splice into OnStar microphone to utilize hands free protocol / phone calls.

I've got most of that functionality figure out. May also add if hardware permits USB link to playback music from USB source and or phone.

Possible future capabilities I've yet to research

- Link for OBDII data (I'd LOVE this but no idea where to find an open source example) especially if I could log PIDs for tuning!
- LTE Modem for internet hotspot

 

[S33k3r]

You might could get an OBDII dongle off Amazon, and then Torque off the various phone stores. That should allow you to sniff traffic, and compare.

 

[drakon543]

as mentioned above for the obd they already sell obd2 to usb for your suggested setup. it is a corded setup for use with laptops and such. if you bought one and cut it open you would be able to get the pinning that way and then just make your own mountable usb jack that could be either hardwired into the obd2 plug or get some of the male and female plugs and design a jumper harness for easy installation.

 

[MassHoe04]

Very cool project! Would love to see it when ready.

 

[slypher25aussie]

@clarkb created a similar project to this, although his is designed for the 2003-2006 models.

Need beta testers for a bluetooth adapter for 2002-2006 GM Trucks. You can keep it when we're done!

I created a prototype bluetooth adapter the integrates with the factory head unit of certain GMC trucks/SUVs 2002-2006. It was designed as a drop-in replacement for the accessory 6-cd changer in the lower dash found in many of these trucks, like my 2003 Yukon XL Denali. The steering wheel and...

www.tahoeyukonforum.com

 

[Matthew Jeschke]

Super cool! Thanks

 

[Nooj]

I'm slowly designing some electronics for the older trucks, NBS and before where there was no Bluetooth from the factory. The goal is to refresh my Embedded Design skills. I got a masters degree in Computer Engineering years ago and worked in the industry for 7 years but left for sales. That was nearly 12 years ago.

I want to get fresh with it all again. The first project I picked up is to design a upgrade to the existing Delco Radio in our trucks w/ bluetooth functionality. Goal is to:

- Seamless integration with Delphi head unit and harness.
- Utilize tape deck / auxiliary input controls on head unit to control playback from Bluetooth source.
- Splice into OnStar microphone to utilize hands free protocol / phone calls.

I've got most of that functionality figure out. May also add if hardware permits USB link to playback music from USB source and or phone.

Possible future capabilities I've yet to research

- Link for OBDII data (I'd LOVE this but no idea where to find an open source example) especially if I could log PIDs for tuning!
- LTE Modem for internet hotspot

How’s your project coming along? Are you still working on this?

Nooj

 

[Matthew Jeschke]

I haven't worked on it in a couple months. I had to rebuild all my rocker arms and re-spec pushrods, etc. Have a wild engine / top end and it wore out after 12,000 miles.

I need to get back at it though.

Progress so far...
- Got a Bluetooth board working which sinks audio from a bluetooth source and plays on a speaker

Need to do:
- Find wiring diagram for tape deck / aux input on factory head unit.
- Expand A2DP Bluetooth circuit to do stereo audio (currently just mono)
- Get a connector what plugs bluetooth board into head factory harness
- Write code to take microphone inputs for phone calls
- Design a PCB board for final circuit
- Design enclosure