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/... 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: 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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