[Ovmsdev] HUD Connected to OVMS not working

[Michael Geddes]

Thanks for the response Greg.

I tried what you suggested and it still doesn't turn on. (The 'on/off' is a
slider switch rather than a momentary button)

I also went into Jaycar and tried this simple HUD:
https://www.jaycar.com.au/gps-speedometer-head-up-display-with-obdii-data/p/LA9036?gclid=CjwKCAjwtKmaBhBMEiwAyINuwAF-ZMXvydGdYsUu--w37CmHr6mf1Emx_o2shbA3IvUNUQ4k-ZWtcBoCwQoQAvD_BwE
Results were the same (didn't have time to find any settings though - as I
got permission to try it before I bought it).

I also confirmed that the cable is wired exactly as specified (no more, no
less) including 120ohm resistor.

I'm starting to think there's an issue with the OVMS board itself!?

//.ichael

On Sun, 16 Oct 2022 at 02:09, Greg D. <gregd2350 at gmail.com> wrote:

> Hi Michael,
>
> Yeah, odd.
>
> I see in the description that there's a power switch on the side of the
> unit, so that will probably interact with the voltage transition.  After
> turning Ext12v on, and pushing the on/off button on the HUD unit, I would
> expect it would turn on.  After that, transitioning Ext12v on/off should
> trigger the unit to turn on/off as well.
>
> Assuming you do get it running, what I would suggest is to create a pair
> of Events to force Ext12v on and off when the car state transitions.  For
> my car, the states are vehicle.on and vehicle.off, but yours might be
> different.  In the "on" event script I also stop and restart the obd2ecu
> process, as that will clear the CAN3 bus hang that I've experienced.  It's
> a long shot, but perhaps the HUD isn't turning on because it's not seeing
> CAN traffic.  You might try the 12v off / ecu stop / ecu start / 12v on
> sequence manually and see if that wakes the HUD up.
>
> OVMS# vfs cat /store/events/vehicle.on/myevent
> power ext12v off
> obdii ecu stop
> obdii ecu start can3
> power ext12v on
>
> OVMS# vfs cat /store/events/vehicle.off/myevent
> power ext12v off
>
> Good luck!
>
> Greg
>
>
> Michael Geddes wrote:
>
> More information:
>
> I'm definitely getting power on the OVMS -> OBDII cable.  11 volts when
> the car is off, and 12.6 volts when the car is on. I'm assuming this is
> quite deliberate. (And like 0.2 volts when the power to the ext12v is off).
>
> By default, the HUD was needing (according to docs - probably) 13.2v to
> trigger it to turn on.. so I connected it directly to the car OBD and
> changed that setting to 11.5 volts.
>
> When I turned the car off (still connected directly).. the HUD remained on
> as it was still getting > 12V.. so the setting definitely worked.
>
> Unfortunately when I then connected the OVMS to the OBDII and the OVMS ->
> OBDII cable to the HUD - it still didn't turn on. :(  (oh and yes - "power
> ext12v on".
>
> Any thoughts on this would be welcome.
>
> //.ichael
>
>
> On Sat, 15 Oct 2022 at 07:15, Michael Geddes <frog at bunyip.wheelycreek.net>
> wrote:
>
>> Hi all,
>> Anybody got any experience with HUDs?
>>
>> I bought this simple HUD from FastTech:
>> https://www.fasttech.com/products/9686283
>> When connected direct to the OBDII port, it powers on and seems to
>> function. When I connect it to the OVMS module with the standard
>> https://www.fasttech.com/products/9652027  the HUD doesn't even power on.
>>
>> It's stated draw is 200ma which afaict should be fine.  I'm pretty sure
>> the 12V power is getting to PIN 16... though I will try again to make sure.
>> I only have a crappy little Multimeter.
>>
>> On the Troubleshooting it states:
>>    "HUD only available for cars with OBD2 and EU-OBD agreements ... HUD
>> Products don't support JOBD and OBDI protocol."
>>
>> The OBD HUD connector has the following pins:
>>
>> 4* Chassis
>>
>> 5* Signal Ground
>>
>> 6 CAN High
>>
>> 7 *ISO9141 K Line*
>>
>> 14 CAN Low
>>
>> 15 *ISO9141 L Line*
>>
>> 16 Vehicle Battery +ve
>>
>> * Long pins
>>
>>
>> These are the standard OVMS supplied pins:
>>
>> 4 Chassis Ground
>>
>> 5 Chassis Ground
>>
>> 6 CAN H (Primary)
>>
>> 14 CAN L (Primary)
>>
>> 16 +12V
>>
>> So obviously the main difference is the lack of K / L lines in the OVMS
>> ... but I wouldn't have thought that would have prevented it from powering
>> up.
>>
>> Does anybody have any thoughts on this?
>>
>> //.ichael
>>
>>
>>
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