Touch screen and LED panel code - help!

Projects Programming
1

Hi, I'm hoping I posted this in the right place.

I'm a college student and this is my first year dealing with micro controllers and electronics.

My project is this: I want to draw on a touch screen, have the drawing show on the touch screen, and also display on a LED panel.

(Alternatively, click on a button on the touch screen, and have a pattern run on the LED panel. I'm not fussy. I just want to have an input from the touch screen do something on the LED panel.)

I have:

1x Arduino Mega 2560 (https://www.arduino.cc/en/uploads/Main/ ... ematic.pdf)
1x Adafruit 2.8" TFT Touch Shield for Adruino with Resistive Touch Screen (https://learn.adafruit.com/adafruit-2-8 ... -shield-v2)
1x Adafruit 32x32 RGB LED matrix panel (Overview | 32x16 and 32x32 RGB LED Matrix | Adafruit Learning System)

I have downloaded the correct libraries for each device.

I have tested each device and they all work normally. They just don't work together because I haven't got the code right.

Here is the code I'm using:

#include <Adafruit_GFX.h> // Core graphics library
#include <SPI.h>
#include <Wire.h> // this is needed even tho we aren't using it
#include <Adafruit_ILI9341.h>
#include <Adafruit_STMPE610.h>
#include <RGBmatrixPanel.h> //for the RGB panel

// This is calibration data for the raw touch data to the screen coordinates
#define TS_MINX 150
#define TS_MINY 130
#define TS_MAXX 3800
#define TS_MAXY 4000

// The STMPE610 uses hardware SPI on the shield, and #8
#define STMPE_CS 8
Adafruit_STMPE610 ts = Adafruit_STMPE610(STMPE_CS);

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

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

//For the RGB panel
#define CLK 11 // USE THIS ON ARDUINO MEGA
#define OE 46
#define LAT 45
#define A A10
#define B A11
#define C A12
#define D A13

RGBmatrixPanel matrix(A, B, C, D, CLK, LAT, OE, false);

void setup(void) {

int x, y, hue;
float dx, dy, d;
uint8_t sat, val;
uint16_t c;

matrix.begin();

Serial.begin(9600);
Serial.println(F("Touch Paint!"));

tft.begin();

if (!ts.begin()) {
Serial.println("Couldn't start touchscreen controller");
while (1);
}
Serial.println("Touchscreen started");

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(BOXSIZE2, 0, BOXSIZE, BOXSIZE, ILI9341_GREEN);
tft.fillRect(BOXSIZE3, 0, BOXSIZE, BOXSIZE, ILI9341_CYAN);
tft.fillRect(BOXSIZE4, 0, BOXSIZE, BOXSIZE, ILI9341_BLUE);
tft.fillRect(BOXSIZE5, 0, BOXSIZE, BOXSIZE, ILI9341_MAGENTA);

// select the current color 'red'
tft.drawRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
currentcolor = ILI9341_RED;
}

void loop()
{
// See if there's any touch data for us
if (ts.bufferEmpty()) {
return;
}
/*
// You can also wait for a touch
if (! ts.touched()) {
return;
}
*/

// Retrieve a point
TS_Point p = ts.getPoint();

/*
Serial.print("X = "); Serial.print(p.x);
Serial.print("\tY = "); Serial.print(p.y);
Serial.print("\tPressure = "); Serial.println(p.z);
*/

// Scale from ~0->4000 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 < BOXSIZE2) {
currentcolor = ILI9341_YELLOW;
tft.drawRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
} else if (p.x < BOXSIZE3) {
currentcolor = ILI9341_GREEN;
tft.drawRect(BOXSIZE2, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
} else if (p.x < BOXSIZE4) {
currentcolor = ILI9341_CYAN;
tft.drawRect(BOXSIZE3, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
} else if (p.x < BOXSIZE5) {
currentcolor = ILI9341_BLUE;
tft.drawRect(BOXSIZE4, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
} else if (p.x < BOXSIZE6) {
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(BOXSIZE2, 0, BOXSIZE, BOXSIZE, ILI9341_GREEN);
if (oldcolor == ILI9341_CYAN)
tft.fillRect(BOXSIZE3, 0, BOXSIZE, BOXSIZE, ILI9341_CYAN);
if (oldcolor == ILI9341_BLUE)
tft.fillRect(BOXSIZE4, 0, BOXSIZE, BOXSIZE, ILI9341_BLUE);
if (oldcolor == ILI9341_MAGENTA)
tft.fillRect(BOXSIZE5, 0, BOXSIZE, BOXSIZE, ILI9341_MAGENTA);
}
}
if (((p.y-PENRADIUS) > BOXSIZE) && ((p.y+PENRADIUS) < tft.height())) {
tft.fillCircle(p.x, p.y, PENRADIUS, currentcolor);
}
}

I need someone to help me figure out how to make this work. I don't want you to do the project for me. Just point me in the right direction. Thanks!

2

First of all, you haven't told us what is wrong with your program.

Secondly, you didn't use code tags to post your code. It's important that you use them - if you don't, the forum software sometimes interprets sequences of characters in the code as directives to format text in some way. It won't display those sequences, and it will unexpectedly reformat the rest of the text. When that happens, and someone tries to copy your code and paste it into the IDE, it often throws an error, and readers will complain that the code fails to compile. Using code tags also makes it easier to read, and can be copied with a single mouse click.

Unless the sketch is too large, it's better if you post your code, rather than attach it. When it's attached, we have to download it, open it in a text editor, then copy it to the IDE. It's much easier to just view the code in your post.

The code tags make the code look

like this

when posting source code files.
If you have already posted without using code tags, open your message and select "modify" from the pull down menu labelled, "More", at the lower left corner of the message. Before posting the code, use Ctrl-T in the IDE to reformat the code in a standard format, which makes it easier for us to read. Highlight your code by selecting it (it turns blue), and then click on the "</>" icon at the upper left hand corner. Click on the "Save" button. Code tags can also be inserted manually in the forum text using the [code] and [/code] metatags.

3

Oooops! I'm terribly sorry about that! Thanks for the heads up!

Okay...here goes...

I have the touch screen on my mega, and the LED panel hooked up. Everything has power and looks fine.

I have uploaded the following code but nothing happens. The LED panel stays dark and the touch screen is just plain white. If I did the code correctly, it should be displaying the touch paint demo.

#include <Adafruit_GFX.h>    // Core graphics library
#include <SPI.h>
#include <Wire.h>      // this is needed even tho we aren't using it
#include <Adafruit_ILI9341.h>
#include <Adafruit_STMPE610.h>
#include <RGBmatrixPanel.h> //for the RGB panel


// This is calibration data for the raw touch data to the screen coordinates
#define TS_MINX 150
#define TS_MINY 130
#define TS_MAXX 3800
#define TS_MAXY 4000

// The STMPE610 uses hardware SPI on the shield, and #8
#define STMPE_CS 8
Adafruit_STMPE610 ts = Adafruit_STMPE610(STMPE_CS);

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

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

//For the RGB panel
#define CLK 11 // USE THIS ON ARDUINO MEGA
#define OE  46
#define LAT 45
#define A   A10
#define B   A11
#define C   A12
#define D   A13

RGBmatrixPanel matrix(A, B, C, D, CLK, LAT, OE, false);


void setup(void) {

  int      x, y, hue;
  float    dx, dy, d;
  uint8_t  sat, val;
  uint16_t c;

  matrix.begin();

  Serial.begin(9600);
  Serial.println(F("Touch Paint!"));
  
  tft.begin();

  if (!ts.begin()) {
    Serial.println("Couldn't start touchscreen controller");
    while (1);
  }
  Serial.println("Touchscreen started");
  
  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()
{
  // See if there's any  touch data for us
  if (ts.bufferEmpty()) {
    return;
  }
  /*
  // You can also wait for a touch
  if (! ts.touched()) {
    return;
  }
  */

  // Retrieve a point  
  TS_Point p = ts.getPoint();
  
 /*
  Serial.print("X = "); Serial.print(p.x);
  Serial.print("\tY = "); Serial.print(p.y);
  Serial.print("\tPressure = "); Serial.println(p.z);  
 */
 
  // Scale from ~0->4000 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-PENRADIUS) > BOXSIZE) && ((p.y+PENRADIUS) < tft.height())) {
    tft.fillCircle(p.x, p.y, PENRADIUS, currentcolor);
  }
}
4

What happens when you run a standard example sketch from the Adafruit LED matrix library?

5

The touch screen stays white but the LED panel goes through the example without issue.

6

If I try to run a standard example for the Touch screen, the screen stays white. Nothing happens.

7

LindaH:
If I try to run a standard example for the Touch screen, the screen stays white. Nothing happens.

But you said,
"I have tested each device and they all work normally".

8

I tested the LED panel and Touch screen each separately with an Arduino Uno. And each worked.

The LED panel works with the Arduino mega. The touch screen also worked with the mega when I tested it separately.

However the touch screen does not seem to be working now that they are both connected to the mega.