Raspberry Pi with 3.5Inch Display?

Wilson

Hi,
I was wondering if is there a way to setup an raspberry pi running EmteriaOS with a 3.5inch touchscreen?
Thanks in advance.

BasicItStuff

I currently have one on my desk and just started to look at the config.txt that came with it (3.5-inch GPIO https://goo.gl/ePFD3X ). Altho the resolution could be a problem because it's so low? getting it to show emteria should not be that hard, touch on the other hand I don't know. I will keep this post updated.

BasicItStuff

If anyone else has this up and running please do share...

Wilson

@BasicItStuff said:
I currently have one on my desk and just started to look at the config.txt that came with it (3.5-inch GPIO https://goo.gl/ePFD3X ). Altho the resolution could be a problem because it's so low? getting it to show emteria should not be that hard, touch on the other hand I don't know. I will keep this post updated.

Glad to hear that! I hope there is a way to get it show emteria on the screen even if the touch doesn't works

kknott

Was wondering the same thing as I have a spare 3.5 inch GPIO Touchscreen LCD

BasicItStuff

@IKS I have tested some stuff that I was thinking that would work with my 3.5 inch GPIO Touchscreen LCD and it's not working for me. I get a white screen at power on and that's it. Do you have any suggestions? This is the screen I have (German Amazon) : https://amzn.to/2RF0azC .

If anyone else has any idea or got it to work please share.

IKS

Difficult to tell. I'd recommend you setting up a fresh working system with ADB over Ethernet, so you can see the logcat even if the system doesn't boot.

BasicItStuff

@IKS, Is there a reason I can't set the resolution lower than 800x600? I want to set it to the native resolution of 480 x 320.

BasicItStuff

To get the aspect ratio correct I would need to go with 900 x 600 or 800 x 533, not sure how usable that is on a 3,5 inch screen.

BasicItStuff

It also won't let me use 900 x 600, 800 x 533 or 1440 x 960 🙁

IKS

The first thing you should do is getting the logcat output of the early system boot phase. There is a list of all (detected) supported resolutions, which are used for automatic mode setting. After you know the desired resolution is properly detected, you could deactivate the automatic mode adjustment.

BasicItStuff

Don't need the log in this situation :smile: I know the best resolution for this screen is 480 x 320, 800 x 533, 900 x 600, 1440 x 960 and everything in the same screen ratio. What I will find out tonight is if Emteria agrees :smile: , will post an update how this goes turning off automatic mode setting. Actually did not see this option, focused on the wrong things :smile:

BasicItStuff

900x600 works, 480x320 broke it and now it won't boot beond some command line stuff I can't read :smile: . I will do a new install and test some more. Touch did not work in any situation. Is there an option to switch between USB touch and gpio touch?

BasicItStuff

@IKS is it as simple as an option to switch between USB touch and gpio touch? Or is this more complex?

IKS

If there is a GPIO driver for the touch (like a kernel module or similar), you could just load it. Not sure if there is another way of doing it.

AleP_CP

@IKS said:
If there is a GPIO driver for the touch (like a kernel module or similar), you could just load it. Not sure if there is another way of doing it.

There is some drivers for this diplay and you can try to install it:
sudo rm -rf LCD-show

git clone https://github.com/goodtft/LCD-show.git

chmod -R 755 LCD-show

cd LCD-show/

sudo ./LCD35-show

BasicItStuff

Thanks @AleP_CP , will have to try that. Is this for getting screen output or touch or both?

moizgillani

If anyone has this up and running please do share...

DereckR

Has anyone got this to work. I ordered a 3.5" screen off amazon and need it to work.

reaper773

@BasicItStuff . @IKS
Will it work now without touch? Want to use it as a normal display :smile: