Usar um shild LCD TFT com o Arduino

Xukyo

2 anos ago

Os shields TFT são ecrãs de LCD táteis para a exibição de imagens e a criação de interfaces de usuário, com grafismos mais ou menos complexos, para operar microcontroladores Arduino. Neste tutorial, usamos o shield Kuman TFT 3.5″ (muito próximo do shield 2.8″), mas ele pode ser aplicado para outros shields ou módulos LCD. Basta verificar os pinos utilizados e a compatibilidade da biblioteca.

Material

Computador
Arduino UNO ou Mega
Cabo USB A Macho/B Macho
Shield LCD TFT
Cartão SD (opcional)

Princípio de funcionamento

O shield TFT éequipado com um ecrã LCD sensível ao toque que permite exibir imagens a cores e criar interfaces com curvas e botões para interagir e visualizar dados do Arduino. Ele também é equipado com um leitor de cartões micro SD, que pode servir para guardar imagens ou outros dados.

Esquema

O shield TFT é colocado diretamente sobre uma placa Arduino UNO ou Mega. O shield utiliza quase todos os pinos do Arduino UNO. Certifique-se de não usar os mesmos pinos para outros módulos,

Para informação, os pinos disponíveis são:

pino analógico A5
pino digital 0
pino digital 1

Se a funcionalidade tátil do ecrã não for ser utilizada, também é possível usar os pinos A1, A2, 6 e 7.
Se estiver usando um módulo shield ou LCD diferente, verifique bem os pinos a serem utilizados (pinagem).

Calibrar o TouchScreen

Nenhum ecrâ é igual a outro, e para poder utilizá-los corretamente, é preciso obter os valores corretos das dimensões para adaptar a exibição e a detecção da pressão. Para isso, carregamos o código TouchScreen_Calibr_native.ino, presente nos exemplos da biblioteca MCUFRIEND_kbv.h.

Uma vez carregado o código, usamos uma caneta para pressionar, segurar e soltar em vários pontos do ecrã e assim calibrá-lo. Depois disso, as configurações serão exibidas no monitor serial e no ecrã.

Aqui estão os resultados para o Shiel LCD TFT 3.5″

//3.5 Calibration
const int XP = 8, XM = A2, YP = A3, YM = 9; //320x480 ID=0x9486
const int TS_LEFT = 144, TS_RT = 887, TS_TOP = 936, TS_BOT = 87;

E para o Shield LCD TFT 2.8″

//2.8 Calibration
const int XP=8,XM=A2,YP=A3,YM=9; //240x320 ID=0x9341
const int TS_LEFT=907,TS_RT=120,TS_TOP=74,TS_BOT=913;

Código

Para utilizar o objeto TftScreen, usamos as bibliotecas SD.h, Adafruit_GFX.h, MCUFRIEND_kbv.h, e TouchScreen.h, que permitem gerir a comunicação com o cartão SD, a criação de grafismos, o controle do ecrã e o toque. Este exemplo mostra como é fácil utilizar o ecrã (lembre-se de adaptá-lo ao seu equipamento).

//Libraries
#include <SD.h>//https://www.arduino.cc/en/reference/SD
#include <Adafruit_GFX.h>//https://github.com/adafruit/Adafruit-GFX-Library
#include <MCUFRIEND_kbv.h>//https://github.com/prenticedavid/MCUFRIEND_kbv
#include <TouchScreen.h> //https://github.com/adafruit/Adafruit_TouchScreen

//Constants
#define SD_CS 10
#define BLACK 0
#define GREY 21845
#define BLUE 31
#define RED 63488
#define GREEN 2016
#define DARKGREEN 1472
#define CYAN 2047
#define MAGENTA 63519
#define YELLOW 65504
#define GOLD 56768
#define WHITE 65535

//Touch screen configuration
#define MINPRESSURE 200
#define MAXPRESSURE 1000
// ALL Touch panels and wiring is DIFFERENT
// copy-paste results from TouchScreen_Calibr_native.ino
//3.5 Parameters
const int XP = 8, XM = A2, YP = A3, YM = 9; //320x480 ID=0x9486
const int TS_LEFT = 144, TS_RT = 887, TS_TOP = 936, TS_BOT = 87;
//2.8 Parameters
//const int XP = 8, XM = A2, YP = A3, YM = 9; //240x320 ID=0x9341
//const int TS_LEFT = 907, TS_RT = 120, TS_TOP = 74, TS_BOT = 913;

TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);
TSPoint p;
bool down;
int pixel_x, pixel_y;     //Touch_getXY() updates global vars

//Variables
int currentPage  = 0, oldPage = -1;

//Objects
MCUFRIEND_kbv tft;

// Button calibration
Adafruit_GFX_Button page1_btn, page2_btn;
int margin = 5;
int btnWidth = 100;
int btnHeight = 40;
int btnY = 200;

void setup() {
  //Init Serial USB
  Serial.begin(9600);
  Serial.println(F("Initialize System"));
  //Init tft screen
  uint16_t ID = tft.readID();
  if (ID == 0xD3D3) ID = 0x9486;  //for 3.5" TFT LCD Shield , 0x9341 for 2.8" TFT LCD Shield  
  tft.begin(ID);
  tft.setRotation(1);//0-PORTRAIT 1-PAYSAGE 2-REVERSE PORTRAIT 3-REVERSE PAYSAGE
  //Uncomment if you are using SD
  /*if (!SD.begin(SD_CS)) {
    Serial.println(F("initialization failed!"));
    return;
  }*/
  currentPage = 0; // Indicates that we are at Home Screen
}

void loop() {
  down = Touch_getXY();
  switch (currentPage) {
    case 0:
      if (currentPage != oldPage) {
        Serial.println(F("Page 1"));
        drawPage1();
      }
      page2_btn.press(down && page2_btn.contains(pixel_x, pixel_y));
      //if (page2_btn.justReleased()) page2_btn.drawButton();

      if (page2_btn.justPressed()) {
        currentPage = 1;
      }
      break;

    case 1:
      if (currentPage != oldPage) {
        Serial.println(F("Page 2"));
        drawPage2();
      }
      page1_btn.press(down && page1_btn.contains(pixel_x, pixel_y));
      //if (page1_btn.justReleased()) page1_btn.drawButton();

      if (page1_btn.justPressed()) {
        currentPage = 0;
      }
      break;
  }
}

void drawPage1() { /* function drawHomePage */
  tft.setRotation(1);
  tft.fillScreen(BLACK);
  //Title
  tft.setCursor(0, 10);
  tft.setTextSize(3);
  tft.setTextColor(WHITE, BLACK);
  tft.print("This is page 1"); // Prints the string on the screen
  tft.drawLine(0, 32, 319, 32, DARKGREEN); // Draws the red line

  //text
  tft.setTextSize(3);
  tft.setTextColor(RED, BLACK);
  tft.setCursor(tft.width() / 2. -  14 * 3 * 3, 80);
  tft.print(" Go to page 2 ");

  //Button
  page2_btn.initButton(&tft, tft.width() / 2., 200, 2 * btnWidth, btnHeight, WHITE, GREEN, BLACK, "Page 2", 2);
  page2_btn.drawButton(false);
  oldPage = currentPage;
}

void drawPage2() { /* function drawHomePage */
  tft.setRotation(1);
  tft.fillScreen(GREY);
  //Title
  tft.setCursor(0, 10);
  tft.setTextSize(3);
  tft.setTextColor(WHITE, GREY);
  tft.print("This is page 2"); // Prints the string on the screen
  tft.drawLine(0, 32, 319, 32, DARKGREEN); // Draws the red line

  //text
  tft.setTextSize(3);
  tft.setTextColor(GREEN, BLACK);
  tft.setCursor(tft.width() / 2. - 14 * 3 * 3, 80);
  tft.print(" Go to page 1 ");

  //Button
  page1_btn.initButton(&tft, tft.width() / 2., 200, 2 * btnWidth, btnHeight, WHITE, RED, BLACK, "Page 1", 2);
  page1_btn.drawButton(false);
  oldPage = currentPage;
}
/************************************************************************************
    UTILITY FUNCTION
*************************************************************************************/
bool Touch_getXY(void)
{
  p = ts.getPoint();
  pinMode(YP, OUTPUT);      //restore shared pins
  pinMode(XM, OUTPUT);
  digitalWrite(YP, HIGH);
  digitalWrite(XM, HIGH);
  bool pressed = (p.z > MINPRESSURE && p.z < MAXPRESSURE);
  if (pressed) {
    if (tft.width() <= tft.height()) { //Portrait
      pixel_x = map(p.x, TS_LEFT, TS_RT, 0, tft.width()); //.kbv makes sense to me
      pixel_y = map(p.y, TS_TOP, TS_BOT, 0, tft.height());
    } else {
      pixel_x = map(p.y, TS_TOP, TS_BOT, 0, tft.width());
      pixel_y = map(p.x, TS_RT, TS_LEFT, 0, tft.height());
    }
  }
  return pressed;
}

Bônus: Exemplo de interface gráfica

Neste exemplo, vamos criar uma interface gráfica para mostrar diferentes funcionalidades que podem ser desenvolvidas com o shield TFT.

Lembre-se de adaptá-lo conforme as configurações do seu ecrã.

#include <Adafruit_GFX.h>
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft;
#include <TouchScreen.h>

#include <Fonts/FreeSans9pt7b.h>
#include <Fonts/FreeSans12pt7b.h>
#include <Fonts/FreeSerif12pt7b.h>
#include <FreeDefaultFonts.h>

#define MINPRESSURE 200
#define MAXPRESSURE 1000

// ALL Touch panels and wiring is DIFFERENT
// copy-paste results from TouchScreen_Calibr_native.ino
//3.5 Calibration
const int XP = 8, XM = A2, YP = A3, YM = 9; //320x480 ID=0x9486
const int TS_LEFT = 144, TS_RT = 887, TS_TOP = 936, TS_BOT = 87;
/*PORTRAIT CALIBRATION     320 x 480
  x = map(p.x, LEFT=144, RT=887, 0, 320)
  y = map(p.y, TOP=936, BOT=87, 0, 480)
  Touch Pin Wiring XP=8 XM=A2 YP=A3 YM=9
  LANDSCAPE CALIBRATION    480 x 320
  x = map(p.y, LEFT=936, RT=87, 0, 480)
  y = map(p.x, TOP=887, BOT=144, 0, 320)*/
//2.8 Calbiration
//const int XP=8,XM=A2,YP=A3,YM=9; //240x320 ID=0x9341
//const int TS_LEFT=907,TS_RT=120,TS_TOP=74,TS_BOT=913;
/*PORTRAIT CALIBRATION     240 x 320
  x = map(p.x, LEFT=907, RT=120, 0, 240)
  y = map(p.y, TOP=74, BOT=913, 0, 320)
  Touch Pin Wiring XP=8 XM=A2 YP=A3 YM=9
  LANDSCAPE CALIBRATION    320 x 240
  x = map(p.y, LEFT=74, RT=913, 0, 320)
  y = map(p.x, TOP=120, BOT=907, 0, 240)*/


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

Adafruit_GFX_Button on_btn, off_btn, page1_btn, page2_btn, page3_btn;
Adafruit_GFX_Button ok_btn, cncl_btn, plus_btn, minus_btn;
Adafruit_GFX_Button menu_btn, info_btn, back_btn;

int pixel_x, pixel_y;     //Touch_getXY() updates global vars

// Button calibration
int margin = 5;
int btnWidth = 100;
int btnHeight = 40;
int btnY = 200;

// Software variable
bool enable_nuit = false;
int parameter = 50, old_parameter = 50;

long temp0 = 60;
long temp1 = 25.5;
long temp2 = 40;
long temp3 = 35.6;


#define BLACK   0x0000
#define GREY    0x5555
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define DARKGREEN   0x05C0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define GOLD    0xDDC0
#define WHITE   0xFFFF

enum pageId {
  MENU,
  SENSOR,
  CMD,
  PARAM,
  INFO
};
unsigned int currentPage = MENU, oldPage = -1;

void setup(void)
{
  Serial.begin(9600);
  //init TFTTouch
  uint16_t ID = tft.readID();
  Serial.print("TFT ID = 0x");
  Serial.println(ID, HEX);
  Serial.println(F("Calibrate for your Touch Panel"));
  if (ID == 0xD3D3) ID = 0x9486;  //for 3.5" TFT LCD Shield , 0x9341 for 2.8" TFT LCD Shield
  tft.begin(ID);
  tft.setRotation(1); //0-PORTRAIT 1-PAYSAGE 2-REVERSE PORTRAIT 3-REVERSE PAYSAGE
  //tft.setFont(&FreeSmallFont);
  /*if (!SD.begin(SD_CS)) {
    Serial.println(F("initialization failed!"));
    return;
    }*/
  currentPage = MENU; // Indicates that we are at Home Screen
  Serial.println("Home Page");
}

bool down ;
void loop(void) {
  switch (currentPage) {
    case MENU: //Menu page
      if (currentPage != oldPage)   drawMenuScreen();
      page1_btn.press(down && page1_btn.contains(pixel_x, pixel_y));
      page2_btn.press(down && page2_btn.contains(pixel_x, pixel_y));
      page3_btn.press(down && page3_btn.contains(pixel_x, pixel_y));

      if (page1_btn.justReleased())
        page1_btn.drawButton();
      if (page2_btn.justReleased())
        page2_btn.drawButton();
      if (page3_btn.justReleased())
        page3_btn.drawButton();

      if (page1_btn.justPressed()) {
        page1_btn.drawButton(true);
        currentPage = SENSOR;
      }
      if (page2_btn.justPressed()) {
        page2_btn.drawButton(true);
        currentPage = CMD;
      }
      if (page3_btn.justPressed()) {
        page3_btn.drawButton(true);
        currentPage = PARAM;
      }
      break;

    case SENSOR:
      if (currentPage != oldPage)   drawSensorScreen();
      readSensor();
      updateTemp();
      menu_btn.press(down && menu_btn.contains(pixel_x, pixel_y));
      info_btn.press(down && info_btn.contains(pixel_x, pixel_y));

      if (menu_btn.justReleased())
        menu_btn.drawButton();
      if (info_btn.justReleased())
        info_btn.drawButton();

      if (menu_btn.justPressed()) {
        menu_btn.drawButton(true);
        currentPage = MENU;
      }
      if (info_btn.justPressed()) {
        info_btn.drawButton(true);
        currentPage = INFO;
      }
      break;

    case CMD:
      if (currentPage != oldPage)   drawCmdScreen();
      on_btn.press(down && on_btn.contains(pixel_x, pixel_y));
      off_btn.press(down && off_btn.contains(pixel_x, pixel_y));
      back_btn.press(down && back_btn.contains(pixel_x, pixel_y));

      if (back_btn.justReleased())
        back_btn.drawButton();
      if (on_btn.justReleased())
        on_btn.drawButton();
      if (off_btn.justReleased())
        off_btn.drawButton();

      if (back_btn.justPressed()) {
        back_btn.drawButton(true);
        currentPage = MENU;
      }
      if (on_btn.justPressed()) {
        on_btn.drawButton(true);
        tft.fillRect(tft.width() / 2. - (btnWidth + 40) / 2, btnY - 4 * margin - (btnHeight) / 2 - (btnHeight + 40), btnWidth + 40, btnHeight + 40, GREEN);
        Serial.println(F("Set ON"));
      }
      if (off_btn.justPressed()) {
        off_btn.drawButton(true);
        tft.fillRect(tft.width() / 2. - (btnWidth + 40) / 2, btnY - 4 * margin - (btnHeight) / 2 - (btnHeight + 40), btnWidth + 40, btnHeight + 40, RED);
        Serial.println(F("Set OFF"));
      }
      break;

    case PARAM: //consigne
      if (currentPage != oldPage)   drawParamScreen();
      plus_btn.press(down && plus_btn.contains(pixel_x, pixel_y));
      minus_btn.press(down && minus_btn.contains(pixel_x, pixel_y));
      ok_btn.press(down && ok_btn.contains(pixel_x, pixel_y));
      cncl_btn.press(down && cncl_btn.contains(pixel_x, pixel_y));

      if (plus_btn.justReleased())
        plus_btn.drawButton();
      if (minus_btn.justReleased())
        minus_btn.drawButton();

      if (ok_btn.justReleased())
        ok_btn.drawButton();
      if (cncl_btn.justReleased())
        cncl_btn.drawButton();
      if (plus_btn.justPressed()) {
        plus_btn.drawButton(true);
        parameter += 1;
        Serial.print(F("Consigne : "));
        Serial.println(parameter);

        drawTextInRect(tft.width() / 2., 60 + 3 * 4 + 6 * 8, parameter, 4, RED, BLACK);
      }
      if (minus_btn.justPressed()) {
        minus_btn.drawButton(true);
        parameter -= 1;
        Serial.print(F("Consigne : "));
        Serial.println(parameter);

        drawTextInRect(tft.width() / 2., 60 + 3 * 4 + 6 * 8, parameter, 4, RED, BLACK);
      }

      if (ok_btn.justPressed()) {
        ok_btn.drawButton(true);
        Serial.println(F("Valider"));
        validateScreen();
        delay(1000);
        currentPage = MENU;

      }
      if (cncl_btn.justPressed()) {
        cncl_btn.drawButton(true);
        parameter = old_parameter;
        Serial.println(F("Annule "));
        cancelScreen();
        delay(1000);
        currentPage = MENU;
      }
      break;

    case INFO:
      if (currentPage != oldPage) drawInfoScreen();
      if (Touch_getXY()) {
        currentPage = MENU;
      }
      break;
  }
  if (oldPage == currentPage){
    down = Touch_getXY();
  }else{
    down=false;
  }
}

/************************************************************************************
    SCREENS DEFINTION
 ************************************************************************************/
void drawMenuScreen() {
  tft.fillScreen(BLACK);
  tft.setTextSize(2);

  // Title
  tft.setTextColor(WHITE, BLACK);
  tft.setCursor(0, 10);
  tft.print("Exemple de menu"); // Prints the string on the screen
  tft.drawLine(0, 32, tft.width() * 0.6, 32, DARKGREEN); // Draws the red line
  tft.setTextColor(WHITE, BLACK);//((255, 255, 255), (0,0,0));
  tft.setCursor(0, 80);
  tft.setTextColor(GREEN, BLACK);//((255, 255, 255), (0,0,0));

  // Button
  page1_btn.initButton(&tft,  tft.width() / 2. , tft.height() / 2. - (1.*btnHeight + margin), 2 * btnWidth, btnHeight, WHITE, GREEN, BLACK, "SENSOR", 2);
  page2_btn.initButton(&tft, tft.width() / 2., tft.height() / 2., 2 * btnWidth, btnHeight, WHITE, GREEN, BLACK, "COMMAND", 2);
  page3_btn.initButton(&tft, tft.width() / 2., tft.height() / 2. + (1.*btnHeight + margin), 2 * btnWidth, btnHeight, WHITE, GREEN, BLACK, "PARAMETER", 2);
  page1_btn.drawButton(false);
  page2_btn.drawButton(false);
  page3_btn.drawButton(false);

  //Button frame
  tft.drawRoundRect(tft.width() / 2. - 1.5 * btnWidth, tft.height() / 2. - (1.5 * btnHeight + 2 * margin), 2 * btnWidth + btnWidth, 3 * btnHeight + 4 * margin, 10, GREEN);
  oldPage = currentPage;
}

void readSensor() {
  temp0 = temp0 + random(-25, 25) / 10;
  temp1 = temp1 + random(-25, 25) / 10;
  temp2 = temp2 + random(-25, 25) / 10;
  temp3 = temp3 + random(-25, 25) / 10;
}

void drawSensorScreen() {
  tft.fillScreen(BLACK);

  tft.drawLine(tft.width() / 2., 0, tft.width() / 2., tft.height(), WHITE);
  tft.drawLine(0, tft.height() / 2., tft.width(), tft.height() / 2., WHITE);

  updateTemp();

  tft.setTextSize(1);
  // bouton centré X,Y
  menu_btn.initButton(&tft,  tft.width() / 2. - btnWidth - margin , tft.height() - btnHeight / 2., btnWidth, btnHeight, WHITE, GREY, BLACK, "MENU", 2);
  info_btn.initButton(&tft, tft.width() / 2. + btnWidth + margin, tft.height() - btnHeight / 2., btnWidth, btnHeight, WHITE, GREY, BLACK, "INFO", 2);
  menu_btn.drawButton(false);
  info_btn.drawButton(false);

  oldPage = currentPage;
}

void updateTemp() {
  //temp1
  if (parameter < temp0) { //(abs(parameter-temp0)<1){
    drawTextInRect(tft.width() / 4., tft.height() / 4., temp0, 5, GREEN, 255);
  } else {
    drawTextInRect(tft.width() / 4., tft.height() / 4., temp0, 5, RED, 255);
  }
  drawTextInRect(3 * tft.width() / 4., tft.height() / 4., temp1, 5, RED, 255);
  drawTextInRect(tft.width() / 4., 3 * tft.height() / 4., temp2, 5, RED, 255);
  drawTextInRect(3 * tft.width() / 4., 3 * tft.height() / 4., temp3, 5, RED, 255);
}

void drawCmdScreen() {
  tft.setRotation(1);            //PORTRAIT
  tft.setTextSize(1);
  tft.fillScreen(BLACK);

  back_btn.initButton(&tft,  60 , 20, btnWidth, btnHeight, BLACK, BLACK, WHITE, "<- Back", 2);

  // bouton centré X,Y
  on_btn.initButton(&tft,  tft.width() / 2. - btnWidth / 2. , btnY, btnWidth, btnHeight, WHITE, GREEN, BLACK, "ON", 2);
  off_btn.initButton(&tft, tft.width() / 2. + btnWidth / 2. + margin, btnY, btnWidth, btnHeight, WHITE, RED, BLACK, "OFF", 2);
  back_btn.drawButton(false);
  on_btn.drawButton(false);
  off_btn.drawButton(false);
  tft.fillRect(tft.width() / 2. - (btnWidth + 40) / 2, btnY - 4 * margin - (btnHeight) / 2 - (btnHeight + 40), btnWidth + 40, btnHeight + 40, RED);
  oldPage = currentPage;
}

void validateScreen() {
  tft.setRotation(1);
  tft.fillScreen(BLACK);
  tft.setTextSize(5);
  tft.setTextColor(BLACK, GREEN);
  tft.setCursor(tft.width() / 2. - 6 * 6 * 4, tft.height() / 2. - 1 * 6);
  tft.print(" VALIDE ");
}

void cancelScreen() {
  tft.setRotation(1);
  tft.fillScreen(BLACK);
  tft.setTextSize(5);
  tft.setTextColor(BLACK, RED);
  tft.setCursor(tft.width() / 2. - 6 * 6 * 4, tft.height() / 2. - 1 * 6);
  tft.print(" ANNULE ");
}

void drawParamScreen() {
  tft.setRotation(1);
  tft.fillScreen(BLACK);
  //Title
  tft.setTextSize(3);
  tft.setTextColor(WHITE, BLACK);
  tft.setCursor(tft.width() / 2. - 9 * 3 * 3, 50);
  tft.print("Parameter");

  ok_btn.initButton(&tft,  2 + btnWidth / 2., btnHeight / 2. + margin, btnWidth, btnHeight, WHITE, DARKGREEN, BLACK, "Valider", 2);
  cncl_btn.initButton(&tft, tft.width() - btnWidth / 2 - 2, btnHeight / 2. + margin, btnWidth, btnHeight, WHITE, RED, BLACK, "Annuler", 2);
  ok_btn.drawButton(false);
  cncl_btn.drawButton(false);

  drawTextInRect(tft.width() / 2., 60 + 3 * 4 + 6 * 8, parameter, 4, RED, BLACK);
  plus_btn.initButton(&tft,  tft.width() / 2. - btnWidth / 2. , 60 + 3 * 4 + 6 * 8 + (btnWidth - 30), btnWidth - 20, btnWidth - 30, WHITE, GREEN, BLACK, "+", 5);
  minus_btn.initButton(&tft, tft.width() / 2. + btnWidth / 2. + margin, 60 + 3 * 4 + 6 * 8 + (btnWidth - 30), btnWidth - 20, btnWidth - 30, WHITE, GREEN, BLACK, "-", 5);
  plus_btn.drawButton(false);
  minus_btn.drawButton(false);
  oldPage = currentPage;
}

void drawInfoScreen() {
  tft.setRotation(1); 
  tft.fillScreen(BLACK);//(100, 155, 203)
  tft.drawRoundRect(10, 50, tft.width() - 20, tft.height() - 60, 5, GREEN); //tft.fillRect (10, 10, 60, 36);
  tft.setTextSize(2);
  tft.setTextColor(WHITE, BLACK);
  tft.setCursor(70, 18);
  tft.print("Information sur l'exemple");
  tft.setTextSize(2);
  tft.setTextColor(WHITE, BLACK);
  tft.setCursor(25, 80);
  tft.print("En cas de probleme avec ce tutoriel,\n  n'hesitez pas a nous contacter");
  tft.setCursor(20, 245);
  tft.print("www.aranacorp.com" );
  oldPage = currentPage;
}


/************************************************************************************
    UTILITY FUNCTION
*************************************************************************************/

void drawTextInRect(int x, int y, long temp, int tsize, unsigned int fColor, unsigned int bColor) {
  int marg = 10;
  char buf[12];
  int nbChar = strlen(itoa(temp, buf, 10)) + 2;
  if (bColor != 255) tft.fillRect(x - nbChar * 3 * tsize - marg, y - nbChar * 1 * tsize - marg, nbChar * 6 * tsize + 2 * marg, nbChar * 2 * tsize + 2 * marg, bColor);
  tft.setTextSize(tsize);
  tft.setTextColor(fColor, BLACK);
  //tft.setCursor(x-strlen(*text)*3*tsize+marg, y+rheight/2.+marg);
  tft.setCursor(x - nbChar * 3 * tsize, y - nbChar * 1 * tsize);
  tft.print(temp);
  //while(*text) tft.print(*text++);
  tft.write(0xF7);
  tft.print("C");
}

bool Touch_getXY(void)
{
  p = ts.getPoint();
  pinMode(YP, OUTPUT);      //restore shared pins
  pinMode(XM, OUTPUT);
  digitalWrite(YP, HIGH);
  digitalWrite(XM, HIGH);
  bool pressed = (p.z > MINPRESSURE && p.z < MAXPRESSURE);
  if (pressed) {
    if (tft.width() <= tft.height()) { //Portrait
      pixel_x = map(p.x, TS_LEFT, TS_RT, 0, tft.width()); //.kbv makes sense to me
      pixel_y = map(p.y, TS_TOP, TS_BOT, 0, tft.height());
    } else {
      pixel_x = map(p.y, TS_TOP, TS_BOT, 0, tft.width());
      pixel_y = map(p.x, TS_RT, TS_LEFT, 0, tft.height());
    }
  }
  return pressed;
}

Aplicações

Criar uma interface gráfica para controlar o seu projeto Arduino

Fontes

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