Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > C4 Corvettes, 1984 - 1996 > C4 General Discussion
Reload this Page >

Comvette diy infotainment system for early C4's released

Notices
C4 General Discussion General C4 Corvette Discussion not covered in Tech

Comvette diy infotainment system for early C4's released

 
Old 05-11-2019, 11:10 AM
  #21  
PoloGreen92
Junior Member
 
PoloGreen92's Avatar
 
Member Since: May 2019
Location: Dayton OH
Posts: 14
Received 5 Likes on 4 Posts
Default

Here I am thinking about how cool a SNES emulator with a Pi would be and then I see this.
PoloGreen92 is offline  
The following users liked this post:
LWesthaver (05-14-2019)
Old 05-11-2019, 03:32 PM
  #22  
LWesthaver
CF Senior Member
Thread Starter
 
LWesthaver's Avatar
 
Member Since: Dec 1999
Location: Columbia MD
Posts: 793
Received 48 Likes on 30 Posts
Default

FYI, I just did a quick estimation of the parts needed to build the Comvette head unit and it looks like this:

$33.00 - Chassis: base-plate, face-plate, overlay
$6.00 - Hex Standoffs
$1.00 - Countersunk screws
$1.00 - Pan head screws

$5.90 - Volume ****
$2.50 - Volume Pot

$6.00 - 3.5mm Stereo Male to Two RCA, Black, 12 Feet
$9.98 - Radio Wiring Harness for General Motors 1978-1991

$8.47 - USB Panel jack
$5.49 - USB 2.0 A-Male to B-Male Cord - 10 Feet

$59.99 - GeeekPi 5 Inch Capacitive Touch Screen 800x480 HDMI
$15.99 - HDMI ribbon cable 10cm, Std. Female to 90 Degree Male
$10.83 - 10 ft Flat High Speed HDMI Cable
$14.00 - USB ribbon cable 10cm, USB A to 90 Degree Micro USB
$5.17 - USB 2.0 A Male to A Female Extension 10-Feet

$6.00 - Misc. screws, washers. nuts etc.
-------------
$191.32

This only the head unit. It does not include the other parts needed to create a complete system. The head unit provides a drop-in chassis to replace your BOSE head unit. It provides a way to plug into the car's existing BOSE wiring harness for sound and power. It's up to you to provide the computer to drive the video and audio.
LWesthaver is offline  
Old 05-13-2019, 02:40 AM
  #23  
Tempest302
Junior Member
 
Member Since: Mar 2019
Posts: 30
Received 1 Like on 1 Post
Default

Originally Posted by LWesthaver View Post
I don't think that the aluminum would cause any problems. But then I haven't given aluminum a lot of thought either.

What are the tolerances of his plasma cutter? Ponoko.com (who cut my parts) can provide accuracy down to around ten thousandths of an inch. Also, the material cost for acrylic is very inexpensive. The total cost for a baseplate, faceplate, and overlay was about $32.00 which includes shipping from Ponoko.

Do you think it would make sense for me to sell these chassis parts or even fully assembled chassis (chassis, touch-screen, volume control w/****, and wiring harness)? Is that something you'd be interested in?

His plasma cutter is designed to handle manufacturing custom auto parts, not sure the closest tolerance it is capable of but the setting I saw him using was 0.00028 of a inch, which is far more then this would need. Not sure how much a per unit cost would be with aluminum versus acrylic but a) I had access to it and b) I figured an anodized aluminum would look good.

As for making the kits, I imagine if you made some plug and play kits with all the wiring, the Pi with the software preloaded, and some step by step instructions that the kits would be at least mildly popular. Ebay or the WTS forums here could be a good place to sell them. This would cut down on how daunting the project feels to people without a lot of experience in custom wiring or similar fields. I feel comfortable with my ability to install the system based off of your blog but I have a minor in electrical engineering and have done similar things. In fact, I am working on custom fabbing sport seat wiring for my 90 sport seats due to an inability to find replacement parts. My opinion is you have done the hard part between finding compatible parts and writing the custom code for the Pi. I am going to try to make it work in my 90 despite the differences between the boses systems since my theory would be that all the differences are in the hardware I would be removing with, at worst, maybe a need to change the output single strength up or down if the bose speaker amps are used to a different power setting. I can't imagine the speaker and amp hardware are different enough that they would require any sort of radical redesign of your system, I mean at a certain point a speaker is a speaker. It should just be one black box connecting to another black box with minor output signal changes. I think.

Final thought would be, if you end up trying to make a go at making kits, adding in features like wideband o2 sensor and/or temp sensor reading and logging.

Edit: just read you wanted to add sport seat control. If you want, when I complete my custom sport seat harness I can send you what I did(switches, amps, volts, etc) , might help with figuring out how to wire it up. I would think it should just be relays in place of the rockers.

Edit Redux: Did some more research into how you would go about connecting the comvette to the sport seat controls. Looks like its going to be two DPDT relays wired to mimic the center off function of the OEM rockers in conjunction with a micro controller for relay control. Found this site: https://makezine.com/2018/03/19/cont...tronic-relays/ that lists some available micro controllers for the Pi if that helps any. I also have a diagram for how to wire the relays but its on a different machine. All in all, it doesn't look that complicated outside of GUI programming on the Pi though the relays might end up costing a not insignificant amount.

Last edited by Tempest302; 05-13-2019 at 03:23 PM.
Tempest302 is offline  
Old 05-13-2019, 12:12 PM
  #24  
CGretired
CF Member
 
Member Since: Aug 2016
Location: Washington
Posts: 58
Received 2 Likes on 2 Posts
Default

This is a cool project. I own a 91 and will be curious to see if this can be adapted.
CGretired is offline  
The following users liked this post:
LWesthaver (05-14-2019)
Old 05-13-2019, 04:16 PM
  #25  
Space387
CF Senior Member
 
Space387's Avatar
 
Member Since: Sep 2017
Location: Marianna Fl
Posts: 310
Received 16 Likes on 15 Posts
Default

Originally Posted by LWesthaver View Post
FYI, I just did a quick estimation of the parts needed to build the Comvette head unit and it looks like this:

$33.00 - Chassis: base-plate, face-plate, overlay
$6.00 - Hex Standoffs
$1.00 - Countersunk screws
$1.00 - Pan head screws

$5.90 - Volume ****
$2.50 - Volume Pot

$6.00 - 3.5mm Stereo Male to Two RCA, Black, 12 Feet
$9.98 - Radio Wiring Harness for General Motors 1978-1991

$8.47 - USB Panel jack
$5.49 - USB 2.0 A-Male to B-Male Cord - 10 Feet

$59.99 - GeeekPi 5 Inch Capacitive Touch Screen 800x480 HDMI
$15.99 - HDMI ribbon cable 10cm, Std. Female to 90 Degree Male
$10.83 - 10 ft Flat High Speed HDMI Cable
$14.00 - USB ribbon cable 10cm, USB A to 90 Degree Micro USB
$5.17 - USB 2.0 A Male to A Female Extension 10-Feet

$6.00 - Misc. screws, washers. nuts etc.
-------------
$191.32

This only the head unit. It does not include the other parts needed to create a complete system. The head unit provides a drop-in chassis to replace your BOSE head unit. It provides a way to plug into the car's existing BOSE wiring harness for sound and power. It's up to you to provide the computer to drive the video and audio.
Aside from a rasberry pi unit would there be anything else we would have to provide to replace just the head unit and retain the tuner and 4 amps that came with the car? I am seriously considering this for a replacement of mine.
Space387 is offline  
The following users liked this post:
LWesthaver (05-14-2019)
Old 05-14-2019, 04:30 PM
  #26  
LWesthaver
CF Senior Member
Thread Starter
 
LWesthaver's Avatar
 
Member Since: Dec 1999
Location: Columbia MD
Posts: 793
Received 48 Likes on 30 Posts
Default

Originally Posted by Tempest302 View Post
Edit: just read you wanted to add sport seat control. If you want, when I complete my custom sport seat harness I can send you what I did(switches, amps, volts, etc) , might help with figuring out how to wire it up. I would think it should just be relays in place of the rockers.

Edit Redux: Did some more research into how you would go about connecting the comvette to the sport seat controls. Looks like its going to be two DPDT relays wired to mimic the center off function of the OEM rockers in conjunction with a micro controller for relay control. Found this site: https://makezine.com/2018/03/19/cont...tronic-relays/ that lists some available micro controllers for the Pi if that helps any. I also have a diagram for how to wire the relays but its on a different machine. All in all, it doesn't look that complicated outside of GUI programming on the Pi though the relays might end up costing a not insignificant amount.
Tempest, thanks for the comments. I have removed all of the wiring and extra stuff from my Sport Seats in preparation for the eventual connection to Comvette. Here's a diagram of the simplest way that I've seen to control (forward/reverse) the recliner and bolster motors:


A pair of SPDT relays should do the trick. I'll need a pair for the recliner motor and another pair for the bolster motor. I'll also need a MOSFET to interface the Raspberry Pi to the relays. But it should be pretty straight-forward.

-Wes
LWesthaver is offline  
Old 05-14-2019, 04:49 PM
  #27  
LWesthaver
CF Senior Member
Thread Starter
 
LWesthaver's Avatar
 
Member Since: Dec 1999
Location: Columbia MD
Posts: 793
Received 48 Likes on 30 Posts
Default

Originally Posted by Space387 View Post
Aside from a rasberry pi unit would there be anything else we would have to provide to replace just the head unit and retain the tuner and 4 amps that came with the car? I am seriously considering this for a replacement of mine.
Space387, I'm not sure what you mean by "retain the tuner". In the early C4's the tuner is part of the head unit. So when the head unit is pulled, the tuner goes too. That's why I've incorporated a new FM Radio module into this project. Essentially, I only re-use the BOSE amplified speakers and the existing wiring harness connections.

All of the parts I've used so far are listed here:

Comvette Components

I've got to say that one of the most important aspects of this project is power management. Computers (like the Raspberry Pi) really cannot tolerate having their power turned off without being shut down properly first. This page describes my approach to dealing with the problem:

Comvette Power Manager

I know that it seems overwhelming sometimes when you consider all of the parts required to build a system like this. Maybe I should offer some pre-built modules like the power manager.

If you're interested in building something like this, grab a Raspberry Pi, monitor, keyboard and mouse and download the image file from my website. From there you should be able to at least get Comvette up and running and see what you think of it.

-Wes

Last edited by LWesthaver; 05-14-2019 at 04:51 PM.
LWesthaver is offline  
Old 05-17-2019, 01:09 AM
  #28  
Space387
CF Senior Member
 
Space387's Avatar
 
Member Since: Sep 2017
Location: Marianna Fl
Posts: 310
Received 16 Likes on 15 Posts
Default

Wes in the 1990-96 cars the head unit is simply an oversized IO panel. The preamp, FM tuner and I think a few other features are in a separate module labeled a tuner. I cant seem to find documentation on it but my next day off I can try to give you the pinout for the input and output plugs. I have a spare tuner and 2 spare head units in pieces as they where used to refurbish my current one.
Space387 is offline  
Old 05-18-2019, 01:55 PM
  #29  
auburn2
CF Senior Member
 
Member Since: Jun 2018
Posts: 168
Received 33 Likes on 25 Posts
Default

Can you do balance and fade adjustment between the speakers?
auburn2 is offline  
Old 05-18-2019, 03:20 PM
  #30  
LWesthaver
CF Senior Member
Thread Starter
 
LWesthaver's Avatar
 
Member Since: Dec 1999
Location: Columbia MD
Posts: 793
Received 48 Likes on 30 Posts
Default

Originally Posted by auburn2 View Post
Can you do balance and fade adjustment between the speakers?
Currently, No.

I decided to leave that feature out as I found that I never used it in the old BOSE system.
LWesthaver is offline  
Old 05-18-2019, 04:06 PM
  #31  
LWesthaver
CF Senior Member
Thread Starter
 
LWesthaver's Avatar
 
Member Since: Dec 1999
Location: Columbia MD
Posts: 793
Received 48 Likes on 30 Posts
Default

Originally Posted by Space387 View Post
Wes in the 1990-96 cars the head unit is simply an oversized IO panel. The preamp, FM tuner and I think a few other features are in a separate module labeled a tuner. I cant seem to find documentation on it but my next day off I can try to give you the pinout for the input and output plugs. I have a spare tuner and 2 spare head units in pieces as they where used to refurbish my current one.
Your avatar confused me. It looks like an early C4 which is the audience for my Comvette project. Do you have an early or late C4?

If you have wiring diagrams for the late C4's BOSE system, it would be great if you could post those diagrams. I'm not ready to tackle a new project but I would like to start understanding the differences between the early and late C4 BOSE systems.

-Wes
LWesthaver is offline  
Old 05-19-2019, 01:09 AM
  #32  
Space387
CF Senior Member
 
Space387's Avatar
 
Member Since: Sep 2017
Location: Marianna Fl
Posts: 310
Received 16 Likes on 15 Posts
Default

Originally Posted by LWesthaver View Post
Your avatar confused me. It looks like an early C4 which is the audience for my Comvette project. Do you have an early or late C4?

If you have wiring diagrams for the late C4's BOSE system, it would be great if you could post those diagrams. I'm not ready to tackle a new project but I would like to start understanding the differences between the early and late C4 BOSE systems.

-Wes
It is a 1990 so the body of an early car but the dash of a later C4. I have searched far and wide but cant seem to find schematics of any kind displaying the 16 wires from the head unit to the control module(tuner)
Space387 is offline  
 


Thread Tools
Search this Thread
Quick Reply: Comvette diy infotainment system for early C4's released


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: