Trying to control a 3.5" RPi Display with a Pico, confusing controls
January 23, 2024, 19:12
Hello, I have recently started work on trying to display something to my pico with a Raspberry Pi 3b RPi screen, but the pins are extremely confusing. I found the documentation for the chip that the display uses (ILI9486) but the pins on the actual display do not match up with the inputs of the display (attached image). I'm not sure exactly what to do, and how to communicate with the screen.
My main question is where is WRX
1. You need to find out where the documentation for the 3.5 inch LCD display can be found. Search engines is a good start.
2. Then you need to find how the LCD is wired in the documentation.
I found the documentation but it's extremely lackluster
I'll post it in a sec
I believe this is it, but the most annoying part is that I don't know the exact model as there are many similar ones on the Internet
here's another one for the same screen
Your picture say version 3.0 but the pdfs doesn't look like it. But have you compared the pinout in the interface ? Are they the ssame?
The problem is, I don't know what version mine is. I can't find it anywhere on the Internet. The actual board of the screen has no sign of what it is
And that is a totally different one than the picture you posted above!
Contact the one you bought it from!
I know! But that's the only one I could find, the only other place I found a similar board was on a forum post where they didn't specify what it was! And I can't, it was bought for me by someone a while back
I'll try, but it'll be hard
So you posted a misleading picture and claimed "this is the one"!
And then you ask for help
I'm sorry, I forgot to mention that. I'll try find the right one and post it asap
I found a forum post with someone who has the same screen, but the link he sends has a different one
https://community.volumio.com/t/volumio-with-3-5-tft-touch-screen-gpio-rpi-3b/11265/263
https://www.aliexpress.us/item/2255800401227616.html?aff_fcid=829630befd0749afb29d6dee12ca92f7-1706083014804-07927-_9xErSj&tt=CPS_NORMAL&aff_fsk=_9xErSj&aff_platform=portals-search&sk=_9xErSj&aff_trace_key=829630befd0749afb29d6dee12ca92f7-1706083014804-07927-_9xErSj&terminal_id=06c1b125c18749869a327c1a98ba26ff&afSmartRedirect=y&gatewayAdapt=glo2usa4itemAdapt
Nvm, I'll probably just give up on this project
I've found it?
*!
The actual screen is the LCD-17520 as far as I know
Though the documentation is even more useless
I'm really sorry for showing incorrect information, I can't find anything about it and I'm extremely confused about it
That is a good start. And it uses SPI for the ddisplay and that gives you the pins used
here is the documentation I found, but the same problem arises
It has SPI pins, but the writing timing diagram uses other pins and I'm not sure how the board is connected to the driver chip
And I'm not sure if it even uses the ILI9486 or not
Well lets simplify it.
The Sparkfun doc say install the driver from https://github.com/goodtft/LCD-show
And then it mentioned LCD35
Yeah, I'm looking at LCD35 right now
Then you are good to go?
As Pico also has a SPI interface.
Yeah, thanks