Introduction: 2.4" TFT LCD Touch Shield Arduino

2.4" TFT LCD Touch Shield Arduino UNO Hello World

2.4" diagonal LCD TFT display 4-wire resistive touchscreen LED backlight

Step 1: Scetch

#include // Core graphics library

#include // Hardware-specific library #include

#define YP A1 // must be an analog pin, use "An" notation! #define XM A2 // must be an analog pin, use "An" notation! #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

// 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);

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

SWTFT tft;

#define BOXSIZE 40 #define PENRADIUS 3 int oldcolor, currentcolor;

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.fillScreen(BLACK);

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); // tft.fillRect(BOXSIZE*6, 0, BOXSIZE, BOXSIZE, WHITE); tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE); currentcolor = RED; pinMode(13, OUTPUT); }

#define MINPRESSURE 10 #define MAXPRESSURE 1000

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(); // TSPoint p = ts.getPoint(); digitalWrite(13, LOW);

// if sharing pins, you'll need to fix the directions of the touchscreen pins //pinMode(XP, OUTPUT); pinMode(XM, OUTPUT); pinMode(YP, OUTPUT); //pinMode(YM, OUTPUT);

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

if (p.z > MINPRESSURE && p.z < MAXPRESSURE) { /* Serial.print("X = "); Serial.print(p.x); Serial.print("\tY = "); Serial.print(p.y); Serial.print("\tPressure = "); Serial.println(p.z); */ if (p.y < (TS_MINY-5)) { Serial.println("erase"); // press the bottom of the screen to erase tft.fillRect(0, BOXSIZE, tft.width(), tft.height()-BOXSIZE, BLACK); } // scale from 0->1023 to tft.width p.x = tft.width()-(map(p.x, TS_MINX, TS_MAXX, tft.width(), 0)); p.y = tft.height()-(map(p.y, TS_MINY, TS_MAXY, tft.height(), 0)); /* 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 = RED; tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE); } else if (p.x < BOXSIZE*2) { currentcolor = YELLOW; tft.drawRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, WHITE); } else if (p.x < BOXSIZE*3) { currentcolor = GREEN; tft.drawRect(BOXSIZE*2, 0, BOXSIZE, BOXSIZE, WHITE); } else if (p.x < BOXSIZE*4) { currentcolor = CYAN; tft.drawRect(BOXSIZE*3, 0, BOXSIZE, BOXSIZE, WHITE); } else if (p.x < 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.y-PENRADIUS) > BOXSIZE) && ((p.y+PENRADIUS) < tft.height())) { tft.fillCircle(p.x, p.y, PENRADIUS, currentcolor); } } }

Step 2: Code and Libraries

Comments

author
Karel Z (author)2017-04-26

I have a touch display 480x320 and this code not work. Please help me.

author
karagenc (author)2016-04-25

Hello, how can i use hc06 or hc05 bluetooth module with this shield?

author
RizonBarns (author)karagenc2017-04-19

It seems the shield doesn't reserve any pins to use, so you cannot.

author
FlorinM6 (author)2016-06-23

hi. i managed to make it working, but the touchscreen seems to be inverted. when i swipe along the x the line appears on y and viceversa! any work around that?

author
CosmonawtM (author)2015-12-19

Plese give work code this code not work

author
DakM (author)CosmonawtM2016-02-20

I agree with you

author
BassamK1 (author)CosmonawtM2016-01-24

im 2 not work

author

the code works you have to import the librarys

author
CosmonawtM (author)2015-12-19

This code not work plese give work code

author
Granzeier (author)2015-08-30

Very cool, I just ordered one of these from BangGood.

But it is not an instructable for you to just show someone else's work. How about if you give some explanation on how to use Adafruit's programs to make your own display - maybe how to write your name, or something else.

author
mrsharkit (author)Granzeier2015-08-30

And banggood sends at least 3 different models, completely different libs used... Instructables is being flooded with bullshit or copied stuff...

author
pfred2 (author)2015-08-30

This is the touch screen demo sketch from

http://misc.ws