Full VGA resolution (640x480) 3.5" display, composite in

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Kcj101
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Kcj101 » Tue May 24, 2016 8:12 pm

Cannikin wrote:
Ganreizu wrote:So what you're saying here is that if i hook up the screen the the pi0, it might have issues supplying power to all the components but if it's off the powerboost directly it will all be fine? Which pins do i use on the powerboost and pi0 to hook them together? 5V pin on screen board -> 5V pin on powerboost right, then ??? pin on powerboost -> ??? pin on pi0?
So there are at least 3 different pins on the PowerBoost that supply 5V: the one marked 5V, the one marked with a + where you can optionally solder in the big USB header, and then below that, the left of the two pins where you can solder in a wire directly. Those all output the same 5V. So I'd have one go to the PP1 pad on the back of the Pi and another go to the +5V on the back of the screen controller (and of course ground wires going from either GND or G or USB (-) pads on the PowerBoost to PP6 on the Pi and GND on the screen controller).

Unless someone one here is confident that you just have one wire from the PowerBoost go to the Pi's PP1 and then a wire from the Pi's 5V GPIO header to the screen.
Ganreizu wrote:Also i realized the ribbon cable for the screen juts out pretty far when the screen is flipped upside down the way we have it. It'll squish up against the power switch on the top half of the case at the very least. Is this something to worry about? I know we have to be fragile with it but it seems we're going to have to at least bend it to fit given that the connector is directly below the cable, and i feel like the power switch will damage it eventually.
Once the ribbon cable was plugged in I folded it back over the control board and can get it pretty flat:

Image

I don't have any problem getting the two halves of the shell together, just make sure the ribbon is lying flat when you press the two halves together and that it's not getting hung up on any of the solder pads sticking out of the cut GB circuit board on the other side. Did you end up cutting yours like mine or were you going to get rid of that and hotglue the parts in place so you have room to line up the HDMI on the Pi with the contrast slot?

Are you using a Pi 0 or Pi 2 in the case?

Thanks!

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Cannikin
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Cannikin » Tue May 24, 2016 8:45 pm


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Cannikin
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Cannikin » Wed May 25, 2016 10:41 am

Ganreizu wrote:The pads for the USB go like this?

5V___?____?____ Gnd
O ----- O ----- O ----- O
.........5V___Gnd
..........O ------ O

Did i get that right?
Yep that's right!

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Ganreizu
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Ganreizu » Wed May 25, 2016 11:18 am

Cannikin wrote:[spoiler="Schematic"]
Ganreizu wrote:The pads for the USB go like this?

5V___?____?____ Gnd
O ----- O ----- O ----- O
.........5V___Gnd
..........O ------ O

Did i get that right?
[/spoiler]

Yep that's right!
Hmm ok. I'm hesitating to test this because i know once prerunnerseth's shutdown/powerboost PCB is up for sale i'll buy that so i'll have to wire it up again but i'm just going to wire it to the powerboost with extra long wire and cut the wire off when i know it works and have the screen settings correct. Thanks for your help~

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Photonicide
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Photonicide » Wed May 25, 2016 6:11 pm

My 640x480 screen just arrived tonight and I got the 5V version! It runs great and looks fantastic. Having four times the pixels as my 320 x 240 screen makes a HUGE difference. I got the one @cannikin suggested from ebay http://www.ebay.com/itm/3-5-LCD-key-Pre ... Swj0NUhl4H.
640Screen.png
640Screen.png (682.92 KiB) Viewed 10649 times

Retrohead95
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Retrohead95 » Wed May 25, 2016 7:00 pm

Photonicide wrote:My 640x480 screen just arrived tonight and I got the 5V version! It runs great and looks fantastic. Having four times the pixels as my 320 x 240 screen makes a HUGE difference. I got the one @cannikin suggested from ebay http://www.ebay.com/itm/3-5-LCD-key-Pre ... Swj0NUhl4H.

640Screen.png
Wish I found out about these before I got my adafruit screen. I'll definitely have to include one in my build but unfortunately the sale ends in 4 days. I hope they're still available when I'm ready to purchase. :(

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Cannikin
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Cannikin » Wed May 25, 2016 7:04 pm

Photonicide wrote:My 640x480 screen just arrived tonight and I got the 5V version! It runs great and looks fantastic. Having four times the pixels as my 320 x 240 screen makes a HUGE difference. I got the one @cannikin suggested from ebay http://www.ebay.com/itm/3-5-LCD-key-Pre ... Swj0NUhl4H.

640Screen.png
Nice! Welcome to the 640 club. :)

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Cannikin
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Cannikin » Wed May 25, 2016 11:18 pm

IT'S ALIVE!! Running off the battery and with the actual wiring it'll be living with inside the GB shell:

Image

I was 95% sure it was going to work after hacking things apart and then reassembling, but that 5% was giving me major anxiety. :)

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Fleder
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Fleder » Thu May 26, 2016 2:16 am

Damnit, the board of mine is too wide. I have to get rid of 1mm. Anyone has got an idea?
I wanted to dremel a bit off, but the traces are really close to the edges.
This really ruined my day.

Thijs852
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Re: Full VGA resolution (640x480) 3.5" display, composite in

Post by Thijs852 » Thu May 26, 2016 6:03 am

Fleder wrote:Damnit, the board of mine is too wide. I have to get rid of 1mm. Anyone has got an idea?
I wanted to dremel a bit off, but the traces are really close to the edges.
This really ruined my day.
1mm is not much isn't it possible to cut some space from the gameboy housing, os you don't have to cut the board itself?

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