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@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@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@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)

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@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@bunyip.wheelycreek.net> wrote:
Hi all,
Anybody got any experience with HUDs?

I bought this simple HUD from FastTech:
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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