Due to high demand expect some shipping delays at this time, orders may not ship for 3-4 business days. On MLK Day no orders will be shipped.
0

Automotive can bus to analog
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Automotive can bus to analog

by veedabowlu on Thu Nov 18, 2021 2:21 pm

Hello,
I'm working on an automotive engine swap/conversion. The automotive ECU I am using broadcasts the check engine light over can bus to the instrument cluster and it lights up an LED light in the cluster. The car that this conversion is going into does not have a can bus instrument cluster, just a simple speedometer, and tachometer. I need a light, like an LED on the the dashboard to light up when the engine ECU see's an OBD2 fault code. So, I need some sort of board that I can wire to the engine ECU can bus, and it convert the signal to an analog signal... Any suggestions? I suppose it could also be a can bus to PWM board to light up the LED... What hardware & software would I need?

veedabowlu
 
Posts: 3
Joined: Wed Sep 30, 2020 8:08 am

Re: Automotive can bus to analog

by danhalbert on Tue Dec 07, 2021 1:46 pm


danhalbert
 
Posts: 2951
Joined: Tue Aug 08, 2017 12:37 pm

Re: Automotive can bus to analog

by veedabowlu on Tue Dec 07, 2021 6:34 pm

OK wonderful, now how do I get this to work with the automotive can bus to interpret the check engine light needs to be turned un because of a fault code is active?

veedabowlu
 
Posts: 3
Joined: Wed Sep 30, 2020 8:08 am

Re: Automotive can bus to analog

by danhalbert on Tue Dec 07, 2021 6:52 pm

That depends on how the CAN bus is used. I don't know if something like that is common across cars or not. We did a CAN bus implementation, but we have not used it in such applications. I think a lot of websearching will be necessary :) .

danhalbert
 
Posts: 2951
Joined: Tue Aug 08, 2017 12:37 pm

Re: Automotive can bus to analog

by veedabowlu on Wed Dec 08, 2021 4:49 pm

I'm trying to do something like this, but MUCH cheaper https://checkout.square.site/buy/Q6LHQB ... 2GF77KX4MC
Here is the manual for it...https://drive.google.com/file/d/1Zez4Ew ... 0Hh0k/view
Bosch MED7.5.X applies

Some sort of circuitry, that connects to CAN BUS, ( I understand can bus high, and can bus low) accepts 12V +DC (when ignition is turned on) and when it receives a CAN BUS signal (digital) for an OBD fault code, can turn on an LED light (check engine light)
So I need 4 wires, 12V+ switched power when key on, battery ground, CAN HI, CAN LOW, to turn on a LED light.
All of the other functions would be icing on the cake... but not as necessary.

veedabowlu
 
Posts: 3
Joined: Wed Sep 30, 2020 8:08 am

Please be positive and constructive with your questions and comments.