[Ovmsdev] HUD Connected to OVMS not working

Wed Nov 9 12:54:40 HKT 2022

Is it possible to measure current draw on the hud side? The BTS452R we use should be able to provide 1.8A, but I can’t imagine a HUD using that much. It is of course possible that component is blown/damaged - there is not much else between the incoming 12V from the car and the switched 12V output.

Regards, Mark.

> On 9 Nov 2022, at 11:59 AM, Michael Geddes <frog at bunyip.wheelycreek.net> wrote:
> 
> Ok. So finally got an OBD splitter which lets me get Access to the voltage lines.
> 
> With car on  and ext12 on you get 12v
>  Plug in the HUD and it drops to 2V!
> 
> Michael 
> 
> On Mon, 17 Oct 2022, 4:40 pm Michael Geddes, <frog at bunyip.wheelycreek.net <mailto:frog at bunyip.wheelycreek.net>> wrote:
>> 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 <mailto: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 <mailto: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 <mailto: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 <mailto: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 <mailto: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 <mailto: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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