2.8'' TFT Touch Shield

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Contents

Introduction

    This TFT Touch Shield is Arduino/Crowduino/Arduino Mega compatible, it integrated a 2.8” TFT Display and a resistive touch panel, to make this shield suitable for handheld devices.
    This TFT Touch Shield has 240x320 pixels with individual pixel control, it uses the ILI9341 driver and SPI interface to communicate with controllers such as Arduino, saving you much Arduino pins for other usages in your projects. Besides, A SD card socket is also added to help you develop applications that data storage is needed such as digital picture album.
Model AMS320240TFT
TFT Touch Shileld1.jpgTFT Touch Shileld2.jpg

Features

  • LCD Driver: ILI9341
  • Backlight controllable
  • 65535 rich colors
  • SPI Communication
  • Voltage:4.8~5.5 V
  • Max Current: 200 mA
  • Resolution:320x 240
  • LCD Panel Size: 2.8”
  • Touch Mode: Resistance

Cautions

  • Please Be careful to deposit the fragile scree,pressing too hard on the screen might cause display damage.

Pins usage on Arduino

Function Pin Name Arduino pin Description
TFT Screen Control TF_CS D4 SD card select input
TFT_CS D5 TFT chip select input
TFT_D/C D6 TFT Data/Command control
BACKLIGHT D7 TFT backlight control pin
TFT SPI Interface SPI_MOSI D11 SPI data pin MOSI
SPI_MISO D12 SPI data pin MISO
SPI_SCK D13 SPI Clock Pin SCK
Touch Interface ADC0 A0 Touch Screen Y- input
ADC1 A1 Touch Screen X- input
ADC2 A2 Touch Screen Y+ input
ADC3 A3 Touch Screen X+ input

Usage

Hardware connection

Plug 2.8 TFT Touch Shileld into Arduino or Crowduino.
Connect Arduino to PC via a USB cable.
TFT Touch Shileld hardware1.jpg

Program

1.We suggest using the Seeedstudio TFT Library for this shield. please download them Demo code

2.Install the library to the Arduino IDE library to ...\Arduino\libraries, but please note that if you downloaded the library in .zip file, you should delete the "-master" in the library name when you unzip it, as the "-" can not be recognized in the Arduino Library.

Draw Circle

1.Open the code directly by the path:File -> Examples ->TFT_Touch_Shield_v2->drawCircle.

#include <stdint.h>
#include <TFTv2.h>
#include <SPI.h>

void setup()
{
    TFT_BL_ON;                                          //turn on the background light 
    
    Tft.TFTinit();                                      //init TFT library             

    Tft.drawCircle(100, 100, 30,YELLOW);                //center: (100, 100), r = 30 ,color : YELLOW              
    
    Tft.drawCircle(100, 200, 40,CYAN);                  //center: (100, 200), r = 10 ,color : CYAN  
    
    Tft.fillCircle(200, 100, 30,RED);                   //center: (200, 100), r = 30 ,color : RED    
    
    Tft.fillCircle(200, 200, 30,BLUE);                  //center: (200, 200), r = 30 ,color : BLUE                 
}

void loop()
{

}

2.Upload the code,you will see that.
TFT Touch Shileld display1.jpg

Touch Screen

1.Open the code directly by the path:File -> Examples ->Touch_Screen_Driver->touchScreen.

#include <stdint.h>
#include <SeeedTouchScreen.h> 

#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) // mega
#define YP A2   // must be an analog pin, use "An" notation!
#define XM A1   // must be an analog pin, use "An" notation!
#define YM 54   // can be a digital pin, this is A0
#define XP 57   // can be a digital pin, this is A3 

#elif defined(__AVR_ATmega32U4__) // leonardo
#define YP A2   // must be an analog pin, use "An" notation!
#define XM A1   // must be an analog pin, use "An" notation!
#define YM 18   // can be a digital pin, this is A0
#define XP 21   // can be a digital pin, this is A3 

#else //168, 328, something else
#define YP A2   // must be an analog pin, use "An" notation!
#define XM A1   // must be an analog pin, use "An" notation!
#define YM 14   // can be a digital pin, this is A0
#define XP 17   // can be a digital pin, this is A3 

#endif

//Measured ADC values for (0,0) and (210-1,320-1)
//TS_MINX corresponds to ADC value when X = 0
//TS_MINY corresponds to ADC value when Y = 0
//TS_MAXX corresponds to ADC value when X = 240 -1
//TS_MAXY corresponds to ADC value when Y = 320 -1

#define TS_MINX 116*2
#define TS_MAXX 890*2
#define TS_MINY 83*2
#define TS_MAXY 913*2


// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// The 2.8" TFT Touch shield has 300 ohms across the X plate
TouchScreen ts = TouchScreen(XP, YP, XM, YM);

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

void loop(void) {
  // a point object holds x y and z coordinates
  Point p = ts.getPoint();

  if (p.z > __PRESURE) {
     Serial.print("Raw X = "); Serial.print(p.x);
     Serial.print("\tRaw Y = "); Serial.print(p.y);
     Serial.print("\tPressure = "); Serial.println(p.z);
  }
  
 
  p.x = map(p.x, TS_MINX, TS_MAXX, 0, 240);
  p.y = map(p.y, TS_MINY, TS_MAXY, 0, 320);
  
  // we have some minimum pressure we consider 'valid'
  // pressure of 0 means no pressing!
  if (p.z > __PRESURE) {
     Serial.print("X = "); Serial.print(p.x);
     Serial.print("\tY = "); Serial.print(p.y);
     Serial.print("\tPressure = "); Serial.println(p.z);
  }

  delay(100);
}

2.Upload the code,then open the serial monitor and touch the screen,you will see some information.
TFT Touch Shileld display2.jpg

Resources

This TFT Shield uses the ILI9341 Driver IC, thanks to the Seeed TFT library, It works OK on this TFT Touch Shiled:

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