[Ovmsdev] HUD Connected to OVMS not working

Mon Oct 17 15:31:47 HKT 2022

To be honest, I probably wouldn't trust myself. Might try and get a DA26
through cable or breakout cable so I can make sure I don't break things.

Michael

On Sun, 16 Oct 2022, 4:16 pm Michael Balzer, <dexter at expeedo.de> wrote:

> If you're careful, you can measure directly at the voltage switch BTS452R,
> which is located in the upper left corner of the board close to the DA26
> connector (label U4).
>
> See
> https://www.infineon.com/dgdl/Infineon-BTS452R-DS-v01_01-en.pdf?fileId=db3a30431ddc9372011ddd17aba80002
>
> 12V output is the rightmost pin when viewing from the top, pins down, GND
> is the leftmost pin. Power input is on the tab.
>
> Regards,
> Michael
>
>
> Am 16.10.22 um 09:58 schrieb Michael Geddes:
>
> 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
>>>>
>>>>
>>>>
>>> _______________________________________________
>>> OvmsDev mailing listOvmsDev at lists.openvehicles.comhttp://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>
>>>
>>>
>> _______________________________________________
>> OvmsDev mailing listOvmsDev at lists.openvehicles.comhttp://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>>
>> --
>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>
>> _______________________________________________
>> OvmsDev mailing list
>> OvmsDev at lists.openvehicles.com
>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>
> _______________________________________________
> OvmsDev mailing listOvmsDev at lists.openvehicles.comhttp://lists.openvehicles.com/mailman/listinfo/ovmsdev
>
>
> --
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.openvehicles.com
> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openvehicles.com/pipermail/ovmsdev/attachments/20221017/f92cc438/attachment-0001.htm>