Comments on: MCU Friend 3.5 TFT Identification

By: Alan Hawse

Alan Hawse — Mon, 08 Feb 2021 12:51:32 +0000

In reply to protovtol. Good

By: Alan Hawse

Alan Hawse — Mon, 08 Feb 2021 12:50:40 +0000

In reply to protovtol. You are welcome

By: protovtol

protovtol — Wed, 03 Feb 2021 03:07:19 +0000

WOW! it worked on a Mega. Gave me TFT ID = 0x9486. This is a $7.95 purchase from ebay.

https://www.ebay.com/itm/3-5-inch-480×320-TFT-LCD-Touch-Screen-Display-Board-For-Arduino-UNO-R3-Mega2560/324289564883

By: protovtol

protovtol — Wed, 03 Feb 2021 02:46:13 +0000

Thanks for the detailed work and explanation. I just purchased one of these bloody critters and am yet to turn it on. If it fails, its straight for the dump, and a brand on the back of my hand for buying cheap useless stuff.

Also many thanks to David Prentice of arduino.cc.

By: Alan Hawse

Alan Hawse — Tue, 28 Jul 2020 09:27:22 +0000

In reply to prasad. No. That LCD does not have the backlight connected to a pin. Typically that pin on the LCD is brought to a pin that you could PWM ... but not on that display.

By: prasad

prasad — Tue, 21 Jul 2020 09:45:16 +0000

there is facility to control brightness of HMI? How?

By: Alan Hawse

Alan Hawse — Sun, 31 Mar 2019 16:00:59 +0000

In reply to Nathan Gilbert. Thank you... that is almost certainly right.

By: Nathan Gilbert

Nathan Gilbert — Fri, 18 Jan 2019 22:20:50 +0000

At a guess, it looks like your D3 pin on Screen 3, is faulty. (Notice how it reads low many times it should read high.) When writing color, this would affect the lowest bit of red, and the second highest of blue, but I can’t tell from the images if the color is more messed up than that.

By: Alan Hawse

Alan Hawse — Wed, 05 Dec 2018 01:35:37 +0000

In reply to Dirk Akemann.

Thanks for the feedback… I had come to the same general conclusion about the screen… but having the BF register have different values made me wonder if there was something I was missing.

I did appreciate how well the Segger emWin works on those screens.

By: Dirk Akemann

Dirk Akemann — Tue, 04 Dec 2018 15:03:02 +0000

Hi Alan,

Great to see your work. I can fully support your conclusion from our own experience.
I have asked our emWin team, whether they have some hints for you regarding the third display. As we create start up code for a couple of displays each year, they do have significant experience in that area. They reported back, that they suspect broken or otherwise defunct hardware.

Keep up the good work.
Thanks and best regards,
Dirk Akemann (working at SEGGER)