[Ovmsdev] HUD Connected to OVMS not working

Mon Oct 17 16:40:41 HKT 2022

Yeah - powered from the car OBD port. Exactly.  I measured it directly (11
volts when the car is off, and 12.6 volts when the car is on), but not
under load, and yeah, that's definitely the next step.  I need some better
equipment if I'm going to do it and not fry the circuit board.

//.ichael

On Mon, 17 Oct 2022 at 16:27, Mark Webb-Johnson <mark at webb-johnson.net>
wrote:

>
> To be 100% clear, you are powering this from the car’s 12V, right? Not
> usb? The ext12v simply switches the car’s 12v power line, and doesn’t
> generate anything itself.
>
> If that is so, I think the best check is to see that ext12v line and make
> sure it is being switched correctly.
>
> Regards, Mark
>
> On 17 Oct 2022, at 8:32 AM, Michael Geddes <frog at bunyip.wheelycreek.net>
> wrote:
>
> 
> 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
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
>>>>
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>>>
>>> --
>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>>
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>>
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>>
>> --
>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>
>> _______________________________________________
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>> OvmsDev at lists.openvehicles.com
>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
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