Display Touch-Screen TFT 2.4" ILI9341 per Arduino

Post Views: 4,815

La stragrande maggioranza dei possessori di una board di Arduino è alla costante ricerca di display (touch e non) innovativi, in modo da rendere i propri progetti interessanti ed originali. Un display a basso costo molto interessante è un display TFT 2.4″ ILI9341 Touch-Screen dotato di una risoluzione di 240*320 pixel che utilizza la connessione SPI. Inoltre vi è data anche la possibilità di utilizzare una micro SD card, quest’ultima feature gestibile tramite 4 pin dedicati.

Inoltre vi sono 14 pin di connessione di cui 5 dedicati al touch screen. Il dispositivo in questione è corredato dal processore ILITEK ILI9341.

Ecco una tabella che riporta uno schema di collegamento di ciascun pin del display con il corrispettivo pin di Arduino UNO da collegare :

TFT Dispaly 2.4″ SPI	Arduino UNO
VCC	5 V
GND	GND
CS	10
RESET	8
DC	9
SDI/MOSI	11
SCK	13
LED	5 V
SDD/MISO	12
T_CLK	3
T_CS	4
T_DIN	5
T_DO	6
T_IRQ	7

Per quanto concerne il diagramma di connessione è riportato nell’immagine sottostante:

In seguito è disponibile lo sketch per utilizzare il display nelle sue potenzialità. Tale sketch è stato realizzato dallo youtuber KB1UIF.

//KB1UIF (A.Tedds)
//Paint Sketch for Arduino LCD TFT 2.4" Touch Display 8 bit ILI9341.

#include <Adafruit_GFX_AS.h>
#include <Adafruit_ILI9341_8bit_AS.h>
#include <TouchScreen.h>

#define LCD_CS A3
#define LCD_CD A2
#define LCD_WR A1
#define LCD_RD A0
#define LCD_RESET A4

#define YP A1  // must be an analog pin.
#define XM A2  // must be an analog pin.
#define YM 7   // can be a digital pin.
#define XP 6   // can be a digital pin.

#define TS_MINX 150
#define TS_MINY 120
#define TS_MAXX 920
#define TS_MAXY 940

#define BOXSIZE 40
#define PENRADIUS 3

int oldcolor, currentcolor;

// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// Its about 300 ohms across the X plate on mine.
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

// Assign human-readable names to some common 16-bit color values:
#define BLACK   0xFFFF
#define BLUE    0xFFE0
#define GREEN   0xF81F
#define CYAN    0xF800
#define GRAY1   0x8410
#define RED     0x07FF
#define GRAY2   0x4208
#define MAGENTA 0x07E0
#define YELLOW  0x001F
#define WHITE   0x0000

Adafruit_ILI9341_8bit_AS tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);

void setup(void) 
{
  //Serial.begin(9600);
  //Serial.println(F("Paint!"));

  tft.reset();

  uint16_t identifier = tft.readID();

  //Serial.print(F("LCD driver chip: "));
  //Serial.println(identifier,HEX);

 // tft.begin(identifier);
  tft.begin(0x9341);
  tft.fillScreen(BLACK);
  tft.setRotation(0);

  tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);
  tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, YELLOW);
  tft.fillRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, GREEN);
  tft.fillRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, CYAN);
  tft.fillRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, BLUE);
  tft.fillRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, MAGENTA);

  //Draw a dot for graphic co-ordinations
  //tft.fillCircle(10, 10, PENRADIUS, GREEN); //y,x,size,color
  //tft.fillCircle(230, 310, PENRADIUS, RED); //y,x,size,color

  tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);
  currentcolor = RED;

  //pinMode(13, OUTPUT);
}

#define MINPRESSURE 5
#define MAXPRESSURE 1500

void loop()
{
  //digitalWrite(13, HIGH);
  // Recently Point was renamed TSPoint in the TouchScreen library
  // If you are using an older version of the library, use the
  // commented definition instead.
  Point p = ts.getPoint();

  pinMode(XM, OUTPUT);
  pinMode(YP, OUTPUT);


  // we have some minimum pressure we consider 'valid'
  // pressure of 0 means no pressing!

  if (p.z > MINPRESSURE && p.z < MAXPRESSURE)
  {
    if (p.x < (TS_MINX - 5))
    {
      //Serial.println("erase");
      // press the bottom of the screen to erase
      tft.fillRect(0, BOXSIZE, tft.width(), tft.height() - BOXSIZE, BLACK);
    }

    p.x = map(p.x, TS_MINX, TS_MAXX, 0, 320);
    p.y = map(p.y, TS_MINY, TS_MAXY, 0, 240);


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

      if (p.y < BOXSIZE)
      {
        currentcolor = RED;
        tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);
      } else if (p.y < BOXSIZE * 2)
      {
        currentcolor = YELLOW;
        tft.drawRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, WHITE);
      } else if (p.y < BOXSIZE * 3)
      {
        currentcolor = GREEN;
        tft.drawRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, WHITE);
      } else if (p.y < BOXSIZE * 4)
      {
        currentcolor = CYAN;
        tft.drawRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, WHITE);
      } else if (p.y < BOXSIZE * 5)
      {
        currentcolor = BLUE;
        tft.drawRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, WHITE);
      } else if (p.x < BOXSIZE * 6)
      {
        currentcolor = MAGENTA;
        tft.drawRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, WHITE);
      }

      if (oldcolor != currentcolor)
      {
        if (oldcolor == RED) tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);
        if (oldcolor == YELLOW) tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, YELLOW);
        if (oldcolor == GREEN) tft.fillRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, GREEN);
        if (oldcolor == CYAN) tft.fillRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, CYAN);
        if (oldcolor == BLUE) tft.fillRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, BLUE);
        if (oldcolor == MAGENTA) tft.fillRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, MAGENTA);
      }
    }
    if (((p.x - PENRADIUS) > BOXSIZE) && ((p.y + PENRADIUS) < tft.height()))
    {
      tft.fillCircle(p.y, p.x, PENRADIUS, currentcolor);
    }
  }
}

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

//KB1UIF (A.Tedds)

//Paint Sketch for Arduino LCD TFT 2.4" Touch Display 8 bit ILI9341.

#include <Adafruit_GFX_AS.h>

#include <Adafruit_ILI9341_8bit_AS.h>

#include <TouchScreen.h>

#define LCD_CS A3

#define LCD_CD A2

#define LCD_WR A1

#define LCD_RD A0

#define LCD_RESET A4

#define YP A1 // must be an analog pin.

#define XM A2 // must be an analog pin.

#define YM 7 // can be a digital pin.

#define XP 6 // can be a digital pin.

#define TS_MINX 150

#define TS_MINY 120

#define TS_MAXX 920

#define TS_MAXY 940

#define BOXSIZE 40

#define PENRADIUS 3

int oldcolor, currentcolor;

// For better pressure precision, we need to know the resistance

// between X+ and X- Use any multimeter to read it

// Its about 300 ohms across the X plate on mine.

TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

// Assign human-readable names to some common 16-bit color values:

#define BLACK 0xFFFF

#define BLUE 0xFFE0

#define GREEN 0xF81F

#define CYAN 0xF800

#define GRAY1 0x8410

#define RED 0x07FF

#define GRAY2 0x4208

#define MAGENTA 0x07E0

#define YELLOW 0x001F

#define WHITE 0x0000

Adafruit_ILI9341_8bit_AS tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);

void setup(void)

{

//Serial.begin(9600);

//Serial.println(F("Paint!"));

tft.reset();

uint16_t identifier = tft.readID();

//Serial.print(F("LCD driver chip: "));

//Serial.println(identifier,HEX);

// tft.begin(identifier);

tft.begin(0x9341);

tft.fillScreen(BLACK);

tft.setRotation(0);

tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);

tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, YELLOW);

tft.fillRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, GREEN);

tft.fillRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, CYAN);

tft.fillRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, BLUE);

tft.fillRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, MAGENTA);

//Draw a dot for graphic co-ordinations

//tft.fillCircle(10, 10, PENRADIUS, GREEN); //y,x,size,color

//tft.fillCircle(230, 310, PENRADIUS, RED); //y,x,size,color

tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);

currentcolor = RED;

//pinMode(13, OUTPUT);

}

#define MINPRESSURE 5

#define MAXPRESSURE 1500

void loop()

{

//digitalWrite(13, HIGH);

// Recently Point was renamed TSPoint in the TouchScreen library

// If you are using an older version of the library, use the

// commented definition instead.

Point p = ts.getPoint();

pinMode(XM, OUTPUT);

pinMode(YP, OUTPUT);

// we have some minimum pressure we consider 'valid'

// pressure of 0 means no pressing!

if (p.z > MINPRESSURE && p.z < MAXPRESSURE)

{

if (p.x < (TS_MINX - 5))

{

//Serial.println("erase");

// press the bottom of the screen to erase

tft.fillRect(0, BOXSIZE, tft.width(), tft.height() - BOXSIZE, BLACK);

}

p.x = map(p.x, TS_MINX, TS_MAXX, 0, 320);

p.y = map(p.y, TS_MINY, TS_MAXY, 0, 240);

if (p.x < BOXSIZE)

{

oldcolor = currentcolor;

if (p.y < BOXSIZE)

{

currentcolor = RED;

tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);

} else if (p.y < BOXSIZE * 2)

{

currentcolor = YELLOW;

tft.drawRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, WHITE);

} else if (p.y < BOXSIZE * 3)

{

currentcolor = GREEN;

tft.drawRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, WHITE);

} else if (p.y < BOXSIZE * 4)

{

currentcolor = CYAN;

tft.drawRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, WHITE);

} else if (p.y < BOXSIZE * 5)

{

currentcolor = BLUE;

tft.drawRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, WHITE);

} else if (p.x < BOXSIZE * 6)

{

currentcolor = MAGENTA;

tft.drawRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, WHITE);

}

if (oldcolor != currentcolor)

{

if (oldcolor == RED) tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);

if (oldcolor == YELLOW) tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, YELLOW);

if (oldcolor == GREEN) tft.fillRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, GREEN);

if (oldcolor == CYAN) tft.fillRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, CYAN);

if (oldcolor == BLUE) tft.fillRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, BLUE);

if (oldcolor == MAGENTA) tft.fillRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, MAGENTA);

}

if (((p.x - PENRADIUS) > BOXSIZE) && ((p.y + PENRADIUS) < tft.height()))

{

tft.fillCircle(p.y, p.x, PENRADIUS, currentcolor);

}

Il display in questione è acquistabile su Amazon (clicca qui) per il prezzo di 10 euro (comprese spese di spedizioni)

Simone Candido

Simone Candido è un ragazzo appassionato del mondo tech nella sua totalità. Simone ama immedesimarsi in nuove esperienze, la sua filosofia si basa sulla irrefrenabile voglia di ampliare a 360° le sue conoscenze abbracciando tutti i campi del sapere, in quanto ritiene che il sapere umano sia il connubio perfetto tra cultura umanistica e scientifica.

2 Comments

gianbattistapettinelli | February 6, 2022 at 6:30 pm | Reply

Salve Simone, ti sarei grato se tu mi potessi fornire le tre librerie Adafruit e Touchscreen. Dimmi quanto devo pagare e provvederò di conseguenza. Ho problemi col mio Mac a scaricare i file. Non so perché ma ricevo un errore di download. Puoi rispondermi alla mia mail gianbattistapettinelli@gmail.com
Grazie, ciao.

Gian Battista Pettinelli

Simone Candido | February 10, 2022 at 10:55 am | Reply

Ciao, secondo me per scambiare info piu velocemente potremmo sentirci su telegram , scrivimi a @Simonecandido

Moreware Blog

Mindware site for Raspberry PI and Arduino prototyping

Display Touch-Screen TFT 2.4″ ILI9341 per Arduino

Like this:

Simone Candido

2 Comments

Leave a ReplyCancel reply

Moreware Blog

Mindware site for Raspberry PI and Arduino prototyping

Share this:

Like this:

Simone Candido

2 Comments

Leave a ReplyCancel reply