[Ovmsdev] HUD Connected to OVMS not working

Sun Oct 16 15:58:03 HKT 2022

If you mean the 12v output to the  HUD, then no. I hadn't got a way of
doing that yet.
It had crossed my mind... But was working on the things I could do.

I haven't got those nice clamp ends on my multimeter. Just probes.

Michael

On Sun, 16 Oct 2022, 3:52 pm Michael Balzer, <dexter at expeedo.de> wrote:

> Michael,
>
> did you check the SW_12V level with the HUD connected?
>
> Regards,
> Michael
>
>
> Am 16.10.22 um 06:36 schrieb 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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>>
>>
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