Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Breakout boards, sensors, other Adafruit kits, etc.

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

Hi,

I purchased this item through Pi Hut and am having issues with the touchscreen working. I am working with a Teensy 3.6. The screen works and will load the examples through the Arduino application. The touchscreen is unresponsive when I load the touchscreen examples. The wires are soldered on the Teensy: Y- 21, X+ 22, Y+ 31, X- 32. Any help is appreciated.

User avatar
mikeysklar
 
Posts: 14092
Joined: Mon Aug 01, 2016 8:10 pm

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by mikeysklar »

Are you using the Adafruit_Touchscreen library?

https://github.com/adafruit/Adafruit_TouchScreen

Can you paste in the code you have been running in CODE brackets?

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

Hi,

Yes, I pulled the library from Arduino following the steps on this site:
https://learn.adafruit.com/adafruit-2-8 ... ouchscreen

I loaded the breakoutTouchPaint example from the Adafruit_ILI9341 library and the screen is unresponsive when trying to select colors or draw.

Code: Select all

/***************************************************
  This is our touchscreen painting example for the Adafruit ILI9341 Breakout
  ----> http://www.adafruit.com/products/1770

  Check out the links above for our tutorials and wiring diagrams
  These displays use SPI to communicate, 4 or 5 pins are required to
  interface (RST is optional)
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  MIT license, all text above must be included in any redistribution
 ****************************************************/

/** NOT FOR USE WITH THE TOUCH SHIELD, ONLY FOR THE BREAKOUT! **/

#include <Adafruit_GFX.h>    // Core graphics library
#include <SPI.h>
#include <Adafruit_ILI9341.h>
#include "TouchScreen.h"

// These are the four touchscreen analog pins
#define YP A2  // must be an analog pin, use "An" notation!
#define XM A3  // must be an analog pin, use "An" notation!
#define YM 9   // can be any digital pin
#define XP 8   // can be any digital pin

// This is calibration data for the raw touch data to the screen coordinates
#define TS_MINX 150
#define TS_MINY 120
#define TS_MAXX 920
#define TS_MAXY 940

#define MINPRESSURE 10
#define MAXPRESSURE 1000

// The display uses hardware SPI, plus #9 & #10
#define TFT_CS 10
#define TFT_DC 9
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// For the one we're using, its 300 ohms across the X plate
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

// Size of the color selection boxes and the paintbrush size
#define BOXSIZE 40
#define BANNED 3
int oldcolor, currentcolor;

void setup(void) {
 // while (!Serial);     // used for leonardo debugging
 
  Serial.begin(9600);
  Serial.println(F("Touch Paint!"));
  
  tft.begin();
  tft.fillScreen(ILI9341_BLACK);
  
  // make the color selection boxes
  tft.fillRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_RED);
  tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, ILI9341_YELLOW);
  tft.fillRect(BOXSIZE*2, 0, BOXSIZE, BOXSIZE, ILI9341_GREEN);
  tft.fillRect(BOXSIZE*3, 0, BOXSIZE, BOXSIZE, ILI9341_CYAN);
  tft.fillRect(BOXSIZE*4, 0, BOXSIZE, BOXSIZE, ILI9341_BLUE);
  tft.fillRect(BOXSIZE*5, 0, BOXSIZE, BOXSIZE, ILI9341_MAGENTA);
 
  // select the current color 'red'
  tft.drawRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
  currentcolor = ILI9341_RED;
}


void loop()
{
  // Retrieve a point  
  TSPoint p = ts.getPoint();
  
 /*
  Serial.print("X = "); Serial.print(p.x);
  Serial.print("\tY = "); Serial.print(p.y);
  Serial.print("\tPressure = "); Serial.println(p.z);  
 */
  
  // we have some minimum pressure we consider 'valid'
  // pressure of 0 means no pressing!
  if (p.z < MINPRESSURE || p.z > MAXPRESSURE) {
     return;
  }
  
  // Scale from ~0->1000 to tft.width using the calibration #'s
  p.x = map(p.x, TS_MINX, TS_MAXX, 0, tft.width());
  p.y = map(p.y, TS_MINY, TS_MAXY, 0, tft.height());

  /*
  Serial.print("("); Serial.print(p.x);
  Serial.print(", "); Serial.print(p.y);
  Serial.println(")");
  */

    
  if (p.y < BOXSIZE) {
     oldcolor = currentcolor;

     if (p.x < BOXSIZE) { 
       currentcolor = ILI9341_RED; 
       tft.drawRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
     } else if (p.x < BOXSIZE*2) {
       currentcolor = ILI9341_YELLOW;
       tft.drawRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
     } else if (p.x < BOXSIZE*3) {
       currentcolor = ILI9341_GREEN;
       tft.drawRect(BOXSIZE*2, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
     } else if (p.x < BOXSIZE*4) {
       currentcolor = ILI9341_CYAN;
       tft.drawRect(BOXSIZE*3, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
     } else if (p.x < BOXSIZE*5) {
       currentcolor = ILI9341_BLUE;
       tft.drawRect(BOXSIZE*4, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
     } else if (p.x < BOXSIZE*6) {
       currentcolor = ILI9341_MAGENTA;
       tft.drawRect(BOXSIZE*5, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
     }

     if (oldcolor != currentcolor) {
        if (oldcolor == ILI9341_RED) 
          tft.fillRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_RED);
        if (oldcolor == ILI9341_YELLOW) 
          tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, ILI9341_YELLOW);
        if (oldcolor == ILI9341_GREEN) 
          tft.fillRect(BOXSIZE*2, 0, BOXSIZE, BOXSIZE, ILI9341_GREEN);
        if (oldcolor == ILI9341_CYAN) 
          tft.fillRect(BOXSIZE*3, 0, BOXSIZE, BOXSIZE, ILI9341_CYAN);
        if (oldcolor == ILI9341_BLUE) 
          tft.fillRect(BOXSIZE*4, 0, BOXSIZE, BOXSIZE, ILI9341_BLUE);
        if (oldcolor == ILI9341_MAGENTA) 
          tft.fillRect(BOXSIZE*5, 0, BOXSIZE, BOXSIZE, ILI9341_MAGENTA);
     }
  }
  if (((p.y-BANNED) > BOXSIZE) && ((p.y+BANNED) < tft.height())) {
    tft.fillCircle(p.x, p.y, BANNED, currentcolor);
  }
}

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

I tested this code on an arduino Leonardo to see if there is an issue with the Teensy and the touchscreen portion did not work.

User avatar
mikeysklar
 
Posts: 14092
Joined: Mon Aug 01, 2016 8:10 pm

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by mikeysklar »

Let's start with the basic touchscreendemo.ino

Code: Select all

// Touch screen library with X Y and Z (pressure) readings as well
// as oversampling to avoid 'bouncing'
// This demo code returns raw readings, public domain

#include <stdint.h>
#include "TouchScreen.h"

#define YP A2  // must be an analog pin, use "An" notation!
#define XM A3  // must be an analog pin, use "An" notation!
#define YM 8   // can be a digital pin
#define XP 9   // can be a digital pin

// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// For the one we're using, its 300 ohms across the X plate
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

void setup(void) {
  Serial.begin(9600);
}

void loop(void) {
  // a point object holds x y and z coordinates
  TSPoint p = ts.getPoint();
  
  // we have some minimum pressure we consider 'valid'
  // pressure of 0 means no pressing!
  if (p.z > ts.pressureThreshhold) {
     Serial.print("X = "); Serial.print(p.x);
     Serial.print("\tY = "); Serial.print(p.y);
     Serial.print("\tPressure = "); Serial.println(p.z);
  }

  delay(100);
}
https://github.com/adafruit/Adafruit_To ... screendemo

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

Thank you for working with me (just realized I posted in the wrong forum). I uploaded touchscreendemo.ino to my Leonardo and the 3.2" screen goes white. The graphics demo will load when uploaded to the Leonardo.

I purchased the 2.8" version of this screen as well from Adafruit and it will only show a white screen. I can switch the jumpers back to the 3.2" screen and the graphics demo will start up when powered on. I checked the tabs on the ribbon cable and they are secure. IM1, IM2, and IM3 are all soldered for SPI.

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

20221201_201732.jpg
20221201_201732.jpg (88.57 KiB) Viewed 91 times
There are phantom touches on the 3.2" screen when I use breakoutTouchpaint.ino.

User avatar
mikeysklar
 
Posts: 14092
Joined: Mon Aug 01, 2016 8:10 pm

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by mikeysklar »

What do you see on the serial console when running the touchdemo.ino code on the Leonardo?

You can use customize the pressure by taking a resistance reading between the X+ and X- pins. The example below is for 300 ohms.

Code: Select all

// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// For the one we're using, its 300 ohms across the X plate
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

Here is what I am seeing using the serial console (monitor?) on the 3.2" screen. the 2.8" screen will register touches as well but is still a white screen when the graphicstest.ino is loaded.

Code: Select all

X = 628	Y = 326	Pressure = 453
X = 336	Y = 807	Pressure = 433
X = 664	Y = 766	Pressure = 413
X = 670	Y = 774	Pressure = 256
X = 664	Y = 772	Pressure = 193
X = 670	Y = 766	Pressure = 165
X = 735	Y = 287	Pressure = 240
X = 738	Y = 287	Pressure = 194
X = 355	Y = 431	Pressure = 651
X = 357	Y = 433	Pressure = 820
X = 348	Y = 453	Pressure = 576
X = 344	Y = 452	Pressure = 514
X = 346	Y = 452	Pressure = 475
X = 350	Y = 452	Pressure = 439
X = 351	Y = 453	Pressure = 428
X = 348	Y = 452	Pressure = 477
X = 426	Y = 464	Pressure = 660
X = 429	Y = 466	Pressure = 506
X = 429	Y = 465	Pressure = 504
X = 428	Y = 466	Pressure = 511
Last edited by Kuffcakes on Sun Dec 04, 2022 11:46 pm, edited 2 times in total.

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

I found the issue with the 3.2" screen. The pin assignments in the code are incorrect for YM and XP for breakouttouchpaint.ino. I was changing the digital pin to not piggy back off of D/C.

The 2.8" screen is still a white when breakkouttouchpaint.ino and graphicstest.ino are loaded onto it.

touchscreendemo.ino

Code: Select all

#define YP A2  // must be an analog pin, use "An" notation!
#define XM A3  // must be an analog pin, use "An" notation!
#define YM 8   // can be a digital pin
#define XP 11   // can be a digital pin
breakouttouchpaint.ino

Code: Select all

// These are the four touchscreen analog pins
#define YP A2  // must be an analog pin, use "An" notation!
#define XM A3  // must be an analog pin, use "An" notation!
#define YM 9   // can be any digital pin
#define XP 8   // can be any digital pin

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

Here are two pictures of the 2.8" screen that is only showing a white screen.
20221204_205659.jpg
20221204_205659.jpg (191.38 KiB) Viewed 76 times
20221204_205752.jpg
20221204_205752.jpg (99.37 KiB) Viewed 76 times

User avatar
mikeysklar
 
Posts: 14092
Joined: Mon Aug 01, 2016 8:10 pm

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by mikeysklar »

Congrats on figuring out the pinouts to use the 3.2" with your Teensy.

Please start another thread for the Teensy 3.6 + 2.8" TFT white screen.

User avatar
Kuffcakes
 
Posts: 49
Joined: Sun Oct 08, 2017 12:23 am

Re: Touchscreen Issues with 3.2" TFT LCD with Touchscreen Breakout Board w/MicroSD Socket - ILI9341 Product ID: 1743

Post by Kuffcakes »

I only wish I had noticed that sooner.
My next issue is getting the screen to work on its intended project. I figured out how to build a synth looper that was posted on YouTube. I am replacing the DS touchscreen and mini screen with the 3.2" screen. The screen acts as a beat repeater and bit crusher.
The 3.2" screen will only work if I hold down on it and then move my finger around for the effects. I need to figure out how to just make it work.

Locked
Please be positive and constructive with your questions and comments.

Return to “Other Products from Adafruit”