Composite vs DPI

Discussion about other hardware (including other Pi-like boards)
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Re: Composite vs DPI

Post by Helder » Mon Jul 24, 2017 1:36 pm

moosepr wrote:
Mon Jul 24, 2017 7:28 am
all the 1.8" ones i find are 128x160
You're correct the 1.8 is that resolution I was mistaken on that size model but the other are the correct resolution.
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Re: Composite vs DPI

Post by Hex » Sun Oct 29, 2017 9:22 pm

kite wrote:
Tue Sep 20, 2016 8:57 am
Here is the "driver" (note it won't exactly look like this or mount this way, it's just a prototype):

Image
@kite this is what I was talking about. Would you be selling something like this in the future?

The pcb sticking outside might have an advantage of soldering them like MintyPi pcbs are soldered to each other to reduce the combined height.
Last edited by Hex on Tue Oct 31, 2017 5:23 pm, edited 1 time in total.
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Re: Composite vs DPI

Post by Im2nelson4u » Mon Oct 30, 2017 3:11 pm

Hex wrote:
Sun Oct 29, 2017 9:22 pm
kite wrote:
Tue Sep 20, 2016 8:57 am
Here is the "driver" (note it won't exactly look like this or mount this way, it's just a prototype):

Image
@Kite this is what I was talking about. Would you be selling something like this in the future?

The pcb sticking outside might have an advantage of soldering them like MintyPi pcbs are soldered to each other to reduce the combined height.
Yes plzzzzzzz can u start selling these as well? im trying to design my own in eagle but im just terrible at it and this is what i got so far and im using a separate dc boost pcb to power the led backlight. i much rather buy an adapter from you since it such a nicer and more compact solution Image

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Re: Composite vs DPI

Post by Im2nelson4u » Tue Oct 31, 2017 10:59 am

Here is what Im working on and the reason in why i wanted need something small like that dpi adapter.

Image

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Re: Composite vs DPI

Post by kite » Tue Oct 31, 2017 12:49 pm

Im2nelson4u wrote:
Tue Oct 31, 2017 10:59 am
Here is what Im working on and the reason in why i wanted need something small like that dpi adapter.

<img>
The problem you'd have is you need to get ~40pins up through the hinge to the adapter if there were one behind the screen! Or if you extended the LCD connector then that is 54pins ;) otherwise slim down a driver board and run composite to it
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Re: Composite vs DPI

Post by ThompsonTinkers » Wed Nov 01, 2017 9:00 am

I wonder if you could stash the zero and the dpi adapter in behind the screen. Then have a separate board in the bottom half of the SP for power and buttons. This would certainly leave more room for battery!

Getting at the USB connector and SD card slot on the zero would be tricky. Or just run USB down to the bottom board and have a fancy built in USB switch type thing like Kite’s SAIO boards. Y’know, but split in the middle, using less space overall. :mrgreen:

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Re: Composite vs DPI

Post by codeman0624 » Wed Nov 01, 2017 9:42 am

ThompsonTinkers wrote:
Wed Nov 01, 2017 9:00 am
I wonder if you could stash the zero and the dpi adapter in behind the screen. Then have a separate board in the bottom half of the SP for power and buttons. This would certainly leave more room for battery!

Getting at the USB connector and SD card slot on the zero would be tricky. Or just run USB down to the bottom board and have a fancy built in USB switch type thing like Kite’s SAIO boards. Y’know, but split in the middle, using less space overall. :mrgreen:
It would still be a challenge. When I do my SP builds with the composite screen, I have to replace components to get the driver board to under 3.5mm in height. To do that with the RPi0 you would need to remove the micro USB and HDMI port.

Then to get the ~20 pins you would need down through the hinge, you'd likely need to use a fine-pitched ribbon cable to get it to fit, a bundle of wires might be too bulky. And passing USB through a cable like that can be tricky, since you're no longer controlling the impedance of those high speed lines. Would probably be fine, but could be a potential sticking point.

None of these challenges are impossible to overcome, but none of it would be easy!

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Re: Composite vs DPI

Post by Im2nelson4u » Wed Nov 01, 2017 11:27 am

I dont have that grey SP anymore but what I originally did to fit a composite screen in there was, I 3D printed a bracket to increase the depth slightly and carefully cut out the hinge and glue it to the new back cover with the bracket. If you look in this pic the back plate is slightly thicker, pretty much the same thickness as the front cover.

Image

A little bondo/epoxy work and a sanding made it look like normal so maybe a zero could fit back there. The only wires thru the hinge would be 6-8 wires, USB hub and power cables.

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Re: Composite vs DPI

Post by Hex » Wed Nov 01, 2017 2:30 pm

@kite can you publish the eagle file of this pcb if you do not plan on selling it?
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Re: Composite vs DPI

Post by codeman0624 » Wed Nov 01, 2017 5:00 pm

Im2nelson4u wrote:
Wed Nov 01, 2017 11:27 am
I dont have that grey SP anymore but what I originally did to fit a composite screen in there was, I 3D printed a bracket to increase the depth slightly and carefully cut out the hinge and glue it to the new back cover with the bracket. If you look in this pic the back plate is slightly thicker, pretty much the same thickness as the front cover.

A little bondo/epoxy work and a sanding made it look like normal so maybe a zero could fit back there. The only wires thru the hinge would be 6-8 wires, USB hub and power cables.
You're right, you would only need less than 10 wires. In my head I was counting buttons going to the GPIO. But if you wanted to make everything USB it could be possible. Unfortunately I don't have the skills to make nice looking case modifications like you did.

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