[Ovmsdev] V3 size and arrangement

[Michael Balzer]

Here's a 3.5 inch TFT touch screen for Arduino compared to the V2 box.

It's this one:
http://hobbycomponents.com/shields/642-mcu-friend-35-colour-tft-touch-screen





The TFT module itself is just 3mm thick:




This kind of display would already make a great dashboard addition.

But we should select one with a proper touch layer adjustment, this one
from mcufriend has blind areas at two screen edges (calibration won't
help with that).

Regards,
Michael


Am 19.05.2017 um 16:40 schrieb Mark Webb-Johnson:
> I see what you are saying.  Using a raspberry pi with a 3.5" display as an example, that doesn't fit at all on the old OVMS v2 case, but would fit on our side-by-side option (A) board.
>
> In fact, the Raspberry pi style cases are a pretty good size. A bit bigger than OVMS v2, but still reasonable. For example, the case below is 4" x 2.8" x 1.25" (deep). 100mm x 70mm x 30mm. That is a pretty nice size. Those 3.5" SPI touch panel displays are about U$10 for quantity 1.
>
> I wonder if we could squeeze this down to something exactly the same size as a raspberry pi? With the same mounting holes. There are a lot of cases around for that, and many 3D printing templates for something to be customized. The width is about right, but we would have to go to a stacked arrangement. Something big enough for a 3.5" display.
>
> Mark
>
> On 19 May 2017, at 8:56 PM, Michael Balzer <dexter at expeedo.de> wrote:
>> That looks great :)
>>
>> From a first test (A) should still fit in the Twizy glove box, so should
>> fit in other mounting places as well.
>>
>> As mentioned earlier I think a touch screen would make a nice addon, and
>> (A) seems to be better for mounting a large display directly to the
>> board. That should still make a nice & handy box.
>>
>> I think (B) would become very clunky with a large display.
>>
>> So I'm tending towards (A).
>>
>> Regards,
>> Michael
>>
>>
>>> Am 19.05.2017 um 08:23 schrieb Mark Webb-Johnson:
>>> But, having seen it and held it, I'm now having second thoughts about the layout. As you can see from the attached pictures, the expansion slots are each about 60mm x 45mm. Putting two of those on the board makes it about 9.5cm x 9.5cm square. Height will be similar (a little bit taller) than the current OVMS v2. This is a first draft run only, just to confirm the components, but as you can see there is quite a lot of blank space and traces for the two expansion slots. That, and the sheer number of connectors we have, dominate the board. Let's call this arrangement (A).
>>>
>>> There was an alternative arrangement that I considered a while back. That would be to have just one expansion slot, but use stackable connectors (so multiple boards could be piggybacked on each other). In that arrangement, the expansion slot could be either vertical or horizontal, with a vertical arrangement being close in size to the existing OVMS v2 (but the height would need to be much taller to accommodate the piggybacked expansion boards). Let's call this arrangement (B).
>>>
>>> It doesn't change the wiring. Just the size and arrangement of components on the board, as well as the box housing this all. (A) ends up with a 1" wider+taller box of about the same thickness, while (B) ends up with a box about the same width and height, but significantly thicker. To me, it seems that (A) is more automotive, and (B) more hobbyist.
>>>
>>> What do people think?
>>>
>>>
>> -- 
>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>
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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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