how to connect the 3.5 inch from mcufriend

ED201 · April 14, 2018, 4:56pm

I have spent the last 2 weeks I cannot find which pin is which.

It is supposed to be touch screen, which I understand use the analog pins but this one does not connect to analog pins, it has the digital 36 pin connector instead.

the mcufriend site is in Chinese, the guy I bought it from on ebay is clueless

I have downloaded bunch of libraries but I think the problem is the pin layout I need to assign.

Does anybody recognize the display ?

it is supposed to have the r61581, ili9481 drive for 480×320 pixels

Does anybody have some sample code to load to see if it works at all ?

david_prentice · April 14, 2018, 6:18pm

You plug the "mega2560" shield into a MEGA2560 Arduino.
All the male pins mate with the corresponding female sockets as Nature intended.

You can use UTFT or TFT_HX8357 library for the TFT screen.

You could also use MCUFRIEND_kbv library from the Library Manager but it requires several complicated edits.

The Touch Screen has a XPT2046 controller. Use URTouch library.

If you have any problems, take notes.
Describe which library, what problem. Describe your steps from your notes.

David.

ED201 · April 14, 2018, 7:41pm

I got sample from the RinkyDinkElectronics site, it does not allow to upload (but I can upload other codes)

The TFT plugs nicely into Arduino Mega, I has the UTFT library.

It says timeout

here is the code, just does not work like other things I tired.

// UTFT_Demo_480x320
// Copyright (C)2015 Rinky-Dink Electronics, Henning Karlsen. All right reserved
// web: http://www.RinkyDinkElectronics.com/
//
// This program is a demo of how to use most of the functions
// of the library with a supported display modules.
//
// This demo was made for modules with a screen resolution
// of 480x320 pixels.
//
// This program requires the UTFT library.
//

#include <UTFT.h>

// Declare which fonts we will be using
extern uint8_t SmallFont[];

// Set the pins to the correct ones for your development shield
// ------------------------------------------------------------
// Standard Arduino Mega/Due shield : ,38,39,40,41
// CTE TFT LCD/SD Shield for Arduino Due : ,25,26,27,28
// Teensy 3.x TFT Test Board : ,23,22, 3, 4
// ElecHouse TFT LCD/SD Shield for Arduino Due : ,22,23,31,33
//
// Remember to change the model parameter to suit your display module!
UTFT myGLCD(CTE32HR,25,26,27,28);

void setup()
{
randomSeed(analogRead(0));

// Setup the LCD
myGLCD.InitLCD();
myGLCD.setFont(SmallFont);
}

void loop()
{
int buf[478];
int x, x2;
int y, y2;
int r;

// Clear the screen and draw the frame
myGLCD.clrScr();

myGLCD.setColor(255, 0, 0);
myGLCD.fillRect(0, 0, 479, 13);
myGLCD.setColor(64, 64, 64);
myGLCD.fillRect(0, 306, 479, 319);
myGLCD.setColor(255, 255, 255);
myGLCD.setBackColor(255, 0, 0);
myGLCD.print("* Universal Color TFT Display Library *", CENTER, 1);
myGLCD.setBackColor(64, 64, 64);
myGLCD.setColor(255,255,0);
myGLCD.print("http://www.RinkyDinkElectronics.com/", CENTER, 307);

myGLCD.setColor(0, 0, 255);
myGLCD.drawRect(0, 14, 479, 305);

// Draw crosshairs
myGLCD.setColor(0, 0, 255);
myGLCD.setBackColor(0, 0, 0);
myGLCD.drawLine(239, 15, 239, 304);
myGLCD.drawLine(1, 159, 478, 159);
for (int i=9; i<470; i+=10)
myGLCD.drawLine(i, 157, i, 161);
for (int i=19; i<220; i+=10)
myGLCD.drawLine(237, i, 241, i);

// Draw sin-, cos- and tan-lines
myGLCD.setColor(0,255,255);
myGLCD.print("Sin", 5, 15);
for (int i=1; i<478; i++)
{
myGLCD.drawPixel(i,159+(sin(((i*1.13)*3.14)/180)*95));
}

myGLCD.setColor(255,0,0);
myGLCD.print("Cos", 5, 27);
for (int i=1; i<478; i++)
{
myGLCD.drawPixel(i,159+(cos(((i*1.13)*3.14)/180)*95));
}

myGLCD.setColor(255,255,0);
myGLCD.print("Tan", 5, 39);
for (int i=1; i<478; i++)
{
myGLCD.drawPixel(i,159+(tan(((i*1.13)*3.14)/180)));
}

delay(2000);

myGLCD.setColor(0,0,0);
myGLCD.fillRect(1,15,478,304);
myGLCD.setColor(0, 0, 255);
myGLCD.setBackColor(0, 0, 0);
myGLCD.drawLine(239, 15, 239, 304);
myGLCD.drawLine(1, 159, 478, 159);

// Draw a moving sinewave
x=1;
for (int i=1; i<(47815); i++)
{
x++;
if (x==479)
x=1;
if (i>479)
{
if ((x==239)||(buf[x-1]==159))
myGLCD.setColor(0,0,255);
else
myGLCD.setColor(0,0,0);
myGLCD.drawPixel(x,buf[x-1]);
}
myGLCD.setColor(0,255,255);
y=159+(sin(((i0.7)3.14)/180)(90-(i / 100)));
myGLCD.drawPixel(x,y);
buf[x-1]=y;
}

delay(2000);