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Hi Geir,<br>
<br>
TL;DR: Don't bother.<br>
<br>
The one I have was one of a myriad of choices on Amazon, all doing
about the same thing. It's a "Head Up Display CAR", model A8 HUD.
No manufacturer name, other than "Made in China". I don't actually
use it in the car on a regular basis; I got it for the development
and testing of the obd2ecu code, along with the "SyncUp Drive"
telemetry / HotSpot dongle that I have that started the whole
project.<br>
<br>
I've tried using the HUD a few times, but I kind of don't recommend
it. At least, not this one. The display is too bright to use at
night (even though it adjusts to the ambient), and the
semi-reflective plastic mirror thing that you're supposed to attach
to your window is annoying to use. There's also no place to really
put the whole thing in my Roadster, nor really the need, given the
already-provided car displays. From the brief survey I did before
purchasing the unit, the HUDs in this category only fetch 4 PIDs -
speed, RPM, coolant temp, and fuel flow (sort of), with the fuel
flow running through a rather opaque transform of Mass Air Flow that
isn't very accurate. I did an approximation of the inverse in the
OBDII engine, to try to make it somewhat useful, and use it to
display SoC. But it's really crude. <br>
<br>
One somewhat trivial difference between units that I saw was the
number of digits in the display of fuel flow. Mine has 3, many only
2. But the actual result was disappointing, because in spite of the
opportunity, the unit caps the display at 19.9, vs 99.9, which would
have been useful for SoC. Instead, I have to display SoC/10, and
remember what it means.<br>
<br>
The unit also has a bunch of well-meaning-but-useless alarms, for
example, a reminder to shift when the RPM gets too high. That's set
at like 5,000 RPM (on a car that hits it at typical freeway speeds),
and when it goes off, it's LOUD. Now disabled, along with a few
others. I already have 3 speed indicators in the car (the analog
dash speedometer, the digital display on the car VDS, and one on the
Audio / Nav unit), and none of them agree with each other. So, I
don't really need a HUD to display a fourth, yet different, value.<br>
<br>
So, the HUD is on my desk, where it will stay, next to the
development OVMSv3 proto unit...<br>
<br>
The SyncUp dongle is currently in the car, but it keeps going into
sleep mode on its own, for reasons that appear to be separate from
the OBDII interface. Since that disables the WiFi hotspot, it's
also become effectively useless until I can figure out a way to
trick it into staying awake. I think it isn't sensing vibration
somehow, which is disturbingly spooky. I can tap it with my finger
and it wakes up. What else is it sensing (and reporting back to the
mother ship)?<br>
<br>
If you want to get and log other stuff via the OBDII interface, get
one of the Bluetooth or USB OBDII dongles and a laptop or smartphone
with Torque or equivalent software, and do your display or logging
from there. If it's just one or two parameters to monitor, then the
HUD could be useful if you re-map the 4 requested PIDs to whatever
you want to view. Just recall that the display is oriented to the
original value's purpose (e.g. the increasing arc for displaying
RPM), so your remapping opportunities are rather limited, and not
particularly usability-friendly.<br>
<br>
So far, the best HUD I have found is to get an old smartphone
(sans-SIM), and use it as a wi-fi client to Michael's excellent
Dashboard. THAT is useful for display while driving. <br>
<br>
All that said, what were you thinking of using the HUD for?<br>
<br>
Good luck,<br>
<br>
Greg<br>
<br>
<br>
<div class="moz-cite-prefix">Geir Øyvind Vælidalo wrote:<br>
</div>
<blockquote type="cite"
cite="mid:03B596BF-AF98-46B5-8DD4-66ED3A103011@validalo.net">
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I’m thinking about maybe buying a HUD to connect to OVMS. Do you
have any recommendations? Greg, which one do you have?
<div class=""><br class="">
</div>
<div class="">Best regards,</div>
<div class="">Geir</div>
<br>
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